CN113399858A - Composite brazing filler metal for brazing, preparation method thereof and hard alloy cutter - Google Patents
Composite brazing filler metal for brazing, preparation method thereof and hard alloy cutter Download PDFInfo
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- CN113399858A CN113399858A CN202110449587.4A CN202110449587A CN113399858A CN 113399858 A CN113399858 A CN 113399858A CN 202110449587 A CN202110449587 A CN 202110449587A CN 113399858 A CN113399858 A CN 113399858A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0233—Sheets, foils
- B23K35/0238—Sheets, foils layered
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3006—Ag as the principal constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/302—Cu as the principal constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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Abstract
The invention belongs to the field of brazing filler metal, and particularly relates to a composite brazing filler metal for brazing, a preparation method of the composite brazing filler metal and a hard alloy cutter. The composite solder comprises: a stress buffer layer for buffering the brazing stress; solder alloy layers provided on both side surfaces of the stress buffer layer for use as a solder connecting substance; the solder alloy layer is divided into more than two different areas on the stress buffer layer by the isolation layer; during brazing, the isolating layer can prevent the brazing filler metal alloys of two adjacent areas from converging after being melted. According to the composite brazing filler metal for brazing, during brazing, the isolating layer blocks brazing filler metal alloys in different areas from converging together, a discontinuous gap is formed at a brazing seam, stress lines are cut off, brazing stress is further relieved, and the problems that joint residual stress is large, cracking is easy to occur, and the brazing seam strength is low during working in the brazing of hard alloy and a metal matrix can be effectively solved.
Description
Technical Field
The invention belongs to the technical field of brazing filler metal, and particularly relates to a composite brazing filler metal for brazing, a preparation method of the composite brazing filler metal and a hard alloy cutter.
Background
The hard alloy cutter is widely applied to the fields of rail transit, oil drilling, geological exploration and the like, and plays a role in propelling a 'front' in construction. The change of geological conditions is difficult to be expected in specific construction, a cutter serving as a key part is subjected to the powerful action of various complex soil layers, the use working condition is extremely severe, hard alloy on the cutter is easy to fall off and break off, the cutter replacement frequency is increased, the engineering progress is greatly influenced, and the collapse danger possibility is increased. The reliability of the knife has become an important factor governing the efficiency and economy of operation of the equipment.
The massive hard alloy cutter is mainly formed by brazing hard alloy and a steel base cutter body, the cutter is made of different materials which are connected, the brazing surface of the cutter is large, the thermal expansion coefficients of the hard alloy and the steel base body are greatly different, for example, the linear expansion coefficient of WC-Co alloy is (4-6) multiplied by 10-6/° C, whereas the linear expansion coefficient of ordinary steel is about 12X 10-6and/DEG C, in the cooling process after welding, the shrinkage of the steel matrix is larger than that of the hard alloy, and great stress is generated between the brazing filler metal in the brazing seam and the hard alloy and the matrix material on the two sides. The formed internal stress in the brazing seam affects the performance of the hard alloy and the base material, reduces the strength of the brazing seam, leads to the cracking of the brazing seam in severe cases, and shortens the service life of the hard alloy.
Disclosure of Invention
The invention aims to provide a composite brazing filler metal for brazing, which solves the problems of large joint residual stress, easy cracking and low brazing seam strength during working in the process of brazing hard alloy and steel by adopting the conventional brazing filler metal, and improves the brazing reliability.
The second purpose of the invention is to provide a preparation method of the composite solder for brazing.
A third object of the present invention is to provide a cemented carbide tool.
In order to achieve the purpose, the technical scheme of the composite brazing filler metal for brazing is as follows:
a composite braze for brazing comprising:
a stress buffer layer for buffering the brazing stress;
solder alloy layers provided on both side surfaces of the stress buffer layer for use as a solder connecting substance; the solder alloy layer is divided into more than two different areas on the stress buffer layer by the isolation layer; during brazing, the isolating layer can prevent the brazing filler metal alloys of two adjacent areas from converging after being melted.
The composite brazing filler metal for brazing has the advantages that during brazing, the isolating layer blocks brazing filler metal alloys in different areas from converging together, discontinuous gaps are formed at brazing seams, stress lines are cut off, brazing stress is further relieved, the problems of large joint residual stress, easiness in cracking and low brazing seam strength during working existing in brazing of hard alloy and metal matrix (such as steel) can be effectively solved, and meanwhile, a new solution is provided for the problem of overlarge stress caused by brazing between metals with large thermal expansion coefficient differences.
In the invention, the thermal expansion coefficient of the stress buffer layer is between the hard alloy and the metal matrix (or between two pieces to be welded), and in the process of cooling the soldered joint, the stress buffer layer can compensate the shrinkage difference between the hard alloy and the metal matrix caused by the difference of the linear expansion coefficients, thereby playing the role of slowly releasing stress and reducing the residual stress at the soldered joint. The isolation layer can cut off stress lines, and brazing stress is further relieved.
The isolating layer can separate the solder alloy layer into discrete small blocks, so that the solder alloy layer in the form of discrete small blocks can not generate larger residual stress. In order to facilitate the industrial production of the composite solder and improve the production efficiency, preferably, the isolation layer is of a strip structure, and two ends of the strip structure extend to the edges of two opposite sides of the stress buffer layer.
More preferably, the stress buffer layer is a strip structure, and the strip-shaped isolation layers are arranged at intervals along the length direction of the stress buffer layer. Preferably, the isolation layers correspond to each other on both sides of the stress buffer layer in the thickness direction.
Preferably, the width B of the isolation layer is 0.05-1 mm. Further, the width B of the isolation layer is 0.1-0.5 mm.
The width of the solder alloy layer in different areas is 10-50 mm. The width of the isolation layer is based on the premise that the stress line can be cut off, and the width can be reduced as much as possible so as to avoid adverse effects on welding strength. The width of the solder alloy layer is larger than 50mm, which can cause the generation of larger residual stress, so the stress line needs to be cut off by the isolation layer in time to avoid generating larger residual stress, the too small width of the solder alloy layer can cause the increase of the number of the isolation layers under the stress buffer layer with the same length, and the too large number of the isolation layers in unit length can influence the welding strength.
Preferably, the stress buffer layer is a sheet metal layer, and the stress generated in the brazing process is buffered by the sheet metal layer. More preferably, the thickness of the sheet metal layer is 0.2-0.5 mm. The sheet metal layer is not melted during brazing, and the thermal stress generated in the brazing process is relieved through the plastic deformation of the sheet metal layer. Preferably, the sheet metal layer is copper and copper alloy, carbon steel, stainless steel or nickel alloy.
Preferably, the thickness on one side surface of the solder alloy layer is t1And a thickness on the other side surface of t1’The thickness of the stress buffer layer is t2，t1、t1’The sum is greater than or equal to t 22 times of the stress buffering layer, so that enough brazing alloy is arranged on two sides of the stress buffering layer, and the welding strength is ensured.
The isolation layer is made of a material which can not melt and wet the brazing filler metal during brazing. From the viewpoint of cost, it is preferable that the separation layer is a flow inhibitor layer. Furthermore, the flow inhibitor is a metal oxide type flow inhibitor, and the main components of the flow inhibitor are metal oxide and a binder. The metal oxide may comprise one or more of alumina, zirconia, magnesia, chromia, titania. These oxides all have high melting point characteristics. The flow resisting agent is a commercial product.
Preferably, the solder alloy layer is a copper-based solder and/or a silver-based solder. More preferably, the solder alloy layer is selected from one or more of BCu93P, BCu91PAg, BCu89PAg, BCu58ZnMn, BAg49 zncumni, BAg49ZnCuNi, and BAg45 CuZnSn.
The technical scheme of the preparation method of the composite brazing filler metal for brazing is as follows:
a preparation method of the composite brazing filler metal for brazing comprises the following steps: and forming an isolation layer on the stress buffer layer, wherein the isolation layer divides the side surface of the stress buffer layer into more than two different areas, and compounding the brazing filler metal alloy layer on the stress buffer layer in the different areas.
The preparation method of the composite solder for brazing is an industrial continuous production scheme, and the brazing alloy layer and the sheet metal layer can form metallurgical bonding through hot dipping. The whole method is simple and convenient to operate, good in stability and low in cost.
Preferably, the forming of the isolation layer includes coating a paste-like or paste-like flow inhibitor on the stress relaxation layer. In this form, the industrial continuous production can be realized by using the conventional coating equipment.
Preferably, the step of compounding the solder alloy layer on the stress buffer layer includes hot dip coating the stress buffer layer formed with the isolation layer in a liquid solder alloy layer melt. More preferably, the hot dipping temperature is 30-50 ℃ higher than the liquidus temperature of the solder alloy layer, and the hot dipping time is 10-60 s.
The technical scheme of the hard alloy cutter is as follows:
a hard alloy cutter comprises a metal base body and a hard alloy cutter head, wherein the hard alloy cutter head is brazed on the metal base body by using the composite brazing filler metal, and a brazing seam formed by brazing comprises:
a stress buffer layer for buffering the brazing stress;
the brazing filler metal connecting layer is compounded on the surfaces of the two sides of the stress buffer layer, and the brazing filler metal connecting layer is divided into more than two different areas on the stress buffer layer by the isolating layer.
The hard alloy tool of the invention can effectively relieve the brazing stress by using the composite brazing filler metal, is beneficial to improving the impact resistance and the shear strength of the whole hard alloy tool, solves the problem of poor reliability of the traditional brazing filler metal large hard alloy, and prolongs the service life.
The preferred embodiments of the isolation layer and the stress buffer layer are the same as those of the composite solder technical scheme, and detailed description is omitted.
Drawings
FIG. 1 is a plan view of a composite filler metal for brazing according to example 1 of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1 taken along the length thereof;
FIG. 3 is a continuous production facility for producing the composite filler metal of the present invention;
FIG. 4 is a schematic view showing the slitting of a composite brazing filler metal sheet for brazing in an experimental example;
in the figure, 1-a stress buffer layer, 2-a brazing filler metal alloy layer, 3-an isolation layer, 4-a strip releasing device, 5-a flow inhibitor coating device, 6-an online preheating device, 7-a hot dipping device and 8-a strip collecting device.
Detailed Description
The following examples are provided to further illustrate the practice of the invention.
First, specific examples of the composite brazing filler metal for brazing of the present invention
Example 1
The composite brazing filler metal for brazing according to the present embodiment has a schematic structural view as shown in fig. 1 and 2, and includes a thin strip-shaped stress buffer layer 1, and isolation layers and a brazing filler metal alloy layer provided on both side surfaces of the stress buffer layer 1.
The stress buffer layer 1 can be selected from copper, copper alloy, carbon steel, stainless steel and nickel alloy, in the embodiment, the stress buffer layer is a copper strip, and the thickness t2In other embodiments, the thickness may also be 0.3, 0.4, 0.5, 0.6, 0.8 or 1mm, corresponding to 0.2 mm.
Solder alloy layers 2 are provided on both sides of the thin strip-like metal layer for soldering of solder-side solder parts, e.g. duromers, respectivelyAnd performing brazing connection on the gold and the steel. The solder alloy layer is separated into discrete small blocks by the isolation layer to form different areas. A thickness t on one side surface of the solder alloy layer1And a thickness on the other side surface of t1’The thickness of the stress buffer layer is t2，t1、t1’The sum is greater than or equal to t 22 times of the stress buffering layer, so that enough brazing alloy is arranged on two sides of the stress buffering layer, and the welding strength is ensured. t is t1、t1’May be equal or different, and in the normal state, both are approximately equal, and in this example, t may be set1、t1’The sum of t 22 times of the total weight of the powder. In other cases, t can be flexibly set according to the requirements of the welding object1、t1’The optimum thickness of (a).
The isolation layer is arranged along the length direction of the thin strip-shaped stress buffer layer at intervals in parallel, the two ends of the isolation layer 3 extend to the positions of the two side edges of the width direction of the thin strip-shaped stress buffer layer, and the brazing alloy layers arranged on the two sides of the thin strip-shaped stress buffer layer are cut into corresponding brazing alloy regions arranged along the length direction of the thin strip-shaped stress buffer layer at intervals.
In this embodiment, the isolation layer is an oxide type flow inhibitor, the oxide component is chromium oxide, and in other embodiments, aluminum oxide, titanium oxide, or the like may be selected. The brazing alloy layer is BAg49 ZnCuMnNi. The solder alloy areas on the two sides of the thin strip-shaped stress buffer layer are symmetrically arranged, and the isolation layers on the two sides of the thin strip-shaped stress buffer layer are symmetrically arranged. The width B of the spacer layer was 0.2 mm. The width a of the solder alloy area is 50 mm.
In other embodiments of the composite solder for brazing of the present invention, the isolation layer may be curved, such as S-shaped, Z-shaped, etc., the width B of the isolation layer may be different from 0.05, 0.08, 0.1, 0.2, 0.4, 0.6, 0.8, 1mm, the width a of the solder alloy region may be different from 10, 20, 30, 40mm, the isolation layer may also be staggered on both sides of the stress buffer layer, and under these circumstances, a plurality of isolation layers present a regular repeating pattern on the surface of the stress buffer layer; the isolation layer on the surface of the stress buffer layer can also be irregular and irregular patterns, the shape can also be a non-strip structure such as a circle and a rectangle, the brazing alloy layer can be divided into discrete small blocks, stress lines can be cut off, and the brazing strength can be ensured. The specific material of the thin strip-shaped stress buffer layer can also be copper alloy, carbon steel, stainless steel or nickel alloy; the type of the brazing filler metal alloy layer can also be selected from BCu58ZnMn, BAg49ZnCuNi and the like.
In addition to the brazed connection between cemented carbide and steel, the brazed connection between ceramic and metal can also be realized in the manner of the above-described embodiments.
Second, specific examples of the method for producing the brazing composite filler metal of the present invention
When the composite solder is prepared, the invention mainly provides the following process suitable for industrial continuous production.
The stress buffer layer is required to be subjected to conventional pretreatment before the isolation layer is arranged on the stress buffer layer and hot dip coating, and is required to be subjected to conventional post-treatment after hot dip coating.
The pretreatment comprises alkali washing, acid washing and the like of a metal belt such as a copper belt and the like, and surface oil stains and oxide scales are removed. Exemplary composition of the caustic wash solution: 25-30 g/L of sodium hydroxide, 40-50 g/L of sodium carbonate and 55-60 g/L of phosphoric acid solution. Example composition of the pickling solution: 20% hydrochloric acid solution.
And after alkali washing and acid washing, performing water washing, alcohol washing and drying on the stress buffer layer to obtain a dry and clean surface.
Further, the surface of the stress buffer layer can be roughened before alkali washing and acid washing so as to improve the bonding strength between the solder alloy layer and the isolation layer and the stress buffer layer; the surface roughening method may be embossing, grinding or roughening, etc.
After obtaining the stress buffer layer with a dry and clean surface, coating a paste or pasty flow inhibitor on the stress buffer layer to divide the surface of the stress buffer layer into a plurality of different areas.
The metal strip is preheated before hot dipping to obtain better plating quality.
According to the type of melt of the present invention, it is preferable that the preheating temperature is 400 to 600 ℃.
And after preheating, hot dipping the stress buffer layer coated with the flow resisting agent in the liquid solder alloy layer melt so as to compound the solder alloy layer on the stress buffer layer. It should be noted that, because the solder alloy and the flow inhibitor are not wetted, the solder alloy does not coat the flow inhibitor layer during hot dip plating.
And during hot dip plating, the surface of the liquid brazing alloy layer melt is covered with a covering agent. The covering agent can prevent the reaction between the outside air and the molten solder alloy layer. The covering agent can be selected from soldering flux. Which typically comprises anhydrous potassium fluoride, borax, boric anhydride, potassium fluoroborate, and/or boric acid.
Generally, the hot dipping temperature is 30-50 ℃ higher than the liquidus temperature of the solder alloy layer, and the hot dipping time is 10-60 s.
And the post-treatment after hot dip plating comprises water washing and drying. The water washing is carried out in water at 50-100 ℃.
The production equipment of the composite solder adapting to the process is shown in figure 3 and comprises a strip releasing device 4, a flow inhibitor coating device 5, an online preheating device 6, a hot dipping device 7 and a strip collecting device 8.
The following describes in detail the implementation of the method for producing a composite filler metal, taking the composite filler metal with the structure of production example 1 as an example, with the above production equipment.
Example 2
The preparation method of the composite solder for brazing of the embodiment is used for preparing the BAg49ZnCuMnNi composite solder, and comprises the following steps:
1) carrying out alkali washing and acid washing on the pure copper strip-shaped stress buffer material to remove surface oil stains and oxide skin; the alkaline wash solution used was: 25g/L of sodium hydroxide, 40g/L of sodium carbonate and 55g/L of phosphoric acid solution, wherein the solvent is water; the pickling solution used in pickling is a hydrochloric acid solution with the mass fraction of 20%.
2) And (3) carrying out water washing, alcohol washing and drying on the pure copper buffer stress material subjected to alkali washing and acid washing to obtain a dry and clean surface.
3) Passing the pure copper strip obtained in the step 2) through a flow inhibitor coating device to obtain a copper strip with an interrupted flow inhibitor layer;
4) feeding the coated pure copper strip into an online heating device for preheating, wherein the preheating temperature is 400 ℃;
5) sending the preheated pure copper strip into a BAg49ZnCuMnNi solder solution with the surface covered with soldering flux for hot dip plating, wherein the liquidus temperature of a solder alloy layer is 750 ℃, the hot dip plating temperature is 790 ℃, and the hot dip plating time is 20 s; the brazing flux is 42 percent of anhydrous potassium fluoride, 35 percent of boric anhydride and 23 percent of potassium fluoborate;
and taking the copper strip subjected to hot dip plating out of the liquid brazing filler metal, and sequentially cleaning (by using hot water at 80 ℃) and drying to obtain the composite brazing filler metal.
Example 3
The preparation method of the composite brazing filler metal for brazing in the embodiment is used for preparing the BCu58ZnMn composite brazing filler metal, and comprises the following steps:
1) carrying out alkali washing and acid washing on the 304 stainless steel strip-shaped stress buffer material to remove surface oil stains and oxide skin; the alkaline wash solution used was: 25g/L of sodium hydroxide, 40g/L of sodium carbonate and 55g/L of phosphoric acid solution, wherein the solvent is water; the pickling solution used in pickling is a hydrochloric acid solution with the mass fraction of 20%.
2) And (3) washing the stainless steel buffer stress material subjected to alkali washing and acid washing with water, washing with alcohol and drying to obtain a dry and clean surface.
3) Passing the stainless steel strip obtained in the step 2) through a flow inhibitor coating device to obtain a stainless steel strip with a discontinuous flow inhibitor layer;
4) sending the coated stainless steel strip into an online heating device for preheating, wherein the preheating temperature is 600 ℃;
5) sending the preheated stainless steel strip into BCu58ZnMn solder solution with the surface covered with soldering flux for hot dipping, wherein the liquidus temperature of a solder alloy layer is 930 ℃, the hot dipping temperature is 960 ℃, and the hot dipping time is 30 s; the soldering flux comprises 95% of borax and 5% of boric anhydride.
And taking out the stainless steel subjected to hot dipping from the liquid brazing filler metal, and sequentially cleaning (by using hot water at 80 ℃) and drying to obtain the composite brazing filler metal.
In other embodiments of the preparation method of the composite solder for brazing, the thickness of the required solder alloy layer can be changed from 10s, 40s, 50s and 60s in hot dipping, the preheating temperature can be adjusted to 500 ℃, and composite solder products with different specifications can be obtained.
Third, in a specific example of the cemented carbide tool of the present invention, the cemented carbide is brazed to a steel substrate using the composite filler metal of example 2 or example 3.
Fourth, example of experiment
Experimental example 1
The BAg49 zncumni composite solder strip was prepared by the method of example 2, wherein the strip width was 20mm, the thickness of the stress buffer layer 1 was 0.2mm, the thickness of the solder alloy layer 2 was 0.2mm (both sides were equal in thickness and 0.2mm), the width B of the isolation layer was 0.5mm, and the width a of the solder alloy layer in different regions was 20 mm. Meanwhile, the traditional BAg49ZnCuMnNi sandwich composite solder is prepared, wherein the bandwidth is 20mm, the thickness of the stress buffer layer 1 is 0.2mm, and the thickness of the solder alloy layer 2 is 0.2 mm. The composite solder strips prepared by the two methods are cut into composite solder pieces with the length of 41mm, wherein the BAg49ZnCuMnNi composite solder prepared in example 2 is cut according to the mode of figure 4, and the distances C between the edges of the left and right solder pieces and the edges of the adjacent isolation layers are the same.
The same cemented carbide (grade YG8) was brazed to a steel substrate (grade 45 steel) using two composite braze sheets. Before brazing, the hard alloy and the steel matrix are subjected to surface cleaning treatment by the same method, the surfaces to be brazed are coated with the same brazing flux, then two composite brazing fluxes are respectively placed between the hard alloy and the steel matrix, and the brazing fluxes are melted to form brazing seams by heating under the same high-frequency induction heating equipment and the same parameter setting during brazing.
Five sets of shear specimens were prepared after the brazing, and the average shear strength of the specimen using the BAg49ZnCuMnNi composite brazing filler metal of example 2 was 265.6MPa, and the average shear strength of the specimen using the conventional BAg49ZnCuMnNi sandwich composite brazing filler metal was 241 MPa. The result shows that the shear strength of the composite solder brazed joint provided by the embodiment 2 is higher than that of the traditional sandwich composite solder brazed joint, and the brazing stress can be further relieved after the stress lines at the brazing seams are cut off, so that the joint strength is improved.
Experimental example 2
The BCu58ZnMn composite solder strip obtained in example 3 was used, in which the strip width was 40mm, the thickness of the stress buffer layer 1 was 0.2mm, the thickness of the solder alloy layer 2 was 0.2mm (both sides were equal in thickness and 0.2mm), the width B of the isolation layer was 1mm, and the width a of the solder alloy layer in different regions was 40 mm. Meanwhile, the traditional BCu58ZnMn sandwich composite brazing filler metal is prepared, wherein the bandwidth is 40mm, the thickness of the stress buffer layer 1 is 0.2mm, and the thickness of the brazing filler metal alloy layer 2 is 0.2 mm. The composite brazing filler metal strips prepared by the two methods are cut into composite brazing filler metal sheets with the length of 82mm, wherein the BCu58ZnMn composite brazing filler metal prepared in example 3 is also cut in a mode shown in figure 4, so that the distances C between the edges of the left brazing filler metal sheet and the edges of the right brazing filler metal sheet and the adjacent isolation layers are the same.
The same cemented carbide (grade YG8) was brazed to a steel substrate (grade 45 steel) using two composite braze sheets. Before brazing, the hard alloy and the steel matrix are subjected to surface cleaning treatment by the same method, the surfaces to be brazed are coated with the same brazing flux, then two composite brazing fluxes are respectively placed between the hard alloy and the steel matrix, and the brazing fluxes are melted to form brazing seams by heating under the same high-frequency induction heating equipment and the same parameter setting during brazing.
Five sets of shear specimens were prepared after the brazing, and the average shear strength of the specimen using the BCu58ZnMn composite filler metal of example 3 was 281.4MPa, and the average shear strength of the specimen using the conventional BCu58ZnMn sandwich composite filler metal was 267.2 MPa. The result shows that the shear strength of the composite solder brazed joint provided by the embodiment 3 is higher than that of the traditional sandwich composite solder brazed joint, and the brazing stress can be further relieved after the stress lines at the brazing seams are cut off, so that the joint strength is improved.
Claims (10)
1. A composite brazing filler metal for brazing, characterized by comprising:
a stress buffer layer for buffering the brazing stress;
solder alloy layers provided on both side surfaces of the stress buffer layer for use as a solder connecting substance; the solder alloy layer is divided into more than two different areas on the stress buffer layer by the isolation layer; during brazing, the isolating layer can prevent the brazing filler metal alloys of two adjacent areas from converging after being melted.
2. The composite filler metal for brazing according to claim 1, wherein the separation layer is a flow-resisting agent layer.
3. The composite filler metal for brazing according to claim 1, wherein the isolation layer has a strip-like structure, and both ends of the strip-like structure extend to edges of opposite sides of the stress relaxation layer.
4. The composite filler metal for brazing according to claim 3, wherein the stress buffering layer has a strip-like structure, and the strip-like insulating layers are arranged at intervals along the length direction of the stress buffering layer.
5. The composite filler metal for brazing according to claim 3 or 4, wherein the width B of the separation layer is 0.05 to 1 mm.
6. The composite filler metal for brazing according to claim 3 or 4, wherein the width A of the layer of the filler metal alloy in different regions is 10 to 50 mm.
7. A method for preparing the composite filler metal for brazing according to any one of claims 1 to 6, characterized by comprising the steps of: and forming an isolation layer on the stress buffer layer, wherein the isolation layer divides the surfaces of the two sides of the stress buffer layer into more than two different regions, and compounding the brazing filler metal alloy layer on the stress buffer layer in the different regions.
8. The method of preparing a composite filler metal for brazing according to claim 7, wherein the forming of the barrier layer comprises coating a paste-like or paste-like flow inhibitor on the stress relaxation layer.
9. The method of producing a composite filler metal for brazing according to claim 7 or 8, wherein the step of compounding the filler metal alloy layer onto the stress relaxation layer comprises hot dip coating the stress relaxation layer formed with the separation layer in a liquid filler metal alloy layer melt.
10. A cemented carbide tool comprising a metallic substrate and a cemented carbide insert, wherein the cemented carbide insert is brazed to the metallic substrate using the brazing composite filler metal according to any one of claims 1 to 6, the brazing forming a braze joint comprising:
a stress buffer layer for buffering the brazing stress;
the brazing filler metal connecting layer is compounded on the surfaces of the two sides of the stress buffer layer, and the brazing filler metal connecting layer is divided into more than two different areas on the stress buffer layer by the isolating layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110449587.4A CN113399858A (en) | 2021-04-25 | 2021-04-25 | Composite brazing filler metal for brazing, preparation method thereof and hard alloy cutter |
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| CN202110449587.4A CN113399858A (en) | 2021-04-25 | 2021-04-25 | Composite brazing filler metal for brazing, preparation method thereof and hard alloy cutter |
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| CN115070254A (en) * | 2022-07-06 | 2022-09-20 | 郑州机械研究所有限公司 | Composite brazing filler metal for hard alloy brazing and preparation method thereof |
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