CN111726898B - Method for bonding multiple materials of large graphite heating element for producing vacuum induction furnace - Google Patents
Method for bonding multiple materials of large graphite heating element for producing vacuum induction furnace Download PDFInfo
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- CN111726898B CN111726898B CN202010407234.3A CN202010407234A CN111726898B CN 111726898 B CN111726898 B CN 111726898B CN 202010407234 A CN202010407234 A CN 202010407234A CN 111726898 B CN111726898 B CN 111726898B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 169
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 158
- 239000010439 graphite Substances 0.000 title claims abstract description 158
- 238000010438 heat treatment Methods 0.000 title claims abstract description 87
- 230000006698 induction Effects 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 title claims abstract description 6
- 239000003292 glue Substances 0.000 claims abstract description 62
- 239000000843 powder Substances 0.000 claims abstract description 30
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000001035 drying Methods 0.000 claims abstract description 20
- 239000006229 carbon black Substances 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 7
- 239000007924 injection Substances 0.000 claims abstract description 7
- 239000002969 artificial stone Substances 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 239000000853 adhesive Substances 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 abstract description 6
- 239000011203 carbon fibre reinforced carbon Substances 0.000 abstract description 6
- 238000013329 compounding Methods 0.000 abstract description 4
- 238000005245 sintering Methods 0.000 abstract description 4
- 229910021383 artificial graphite Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000007770 graphite material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
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Abstract
A method for bonding multiple materials of a large graphite heating element for producing a vacuum induction furnace is characterized in that graphite blocks are spliced into the large graphite heating element, the graphite blocks are respectively provided with a T-shaped boss and a T-shaped clamping groove which are matched with each other, two adjacent graphite blocks are mutually clamped through the boss and the clamping groove and leave a glue filling gap, and the upper end faces of the mutually clamped boss and the clamping groove are provided with threaded holes; placing the spliced graphite heating body in a drying furnace, connecting an injection valve of a high-pressure glue gun with a threaded hole of the graphite heating body, fully filling high-temperature graphite glue into a glue filling gap of the spliced graphite heating body, wherein the high-temperature graphite glue consists of furfuryl alcohol, TEA salt, superconducting carbon black and artificial stone ink powder, and drying to obtain the large graphite heating body. The advantages are that: can produce graphite heating elements with the diameter of more than 2000mm, has high yield, and is widely applied to the fields of domestic carbon-carbon compounding, military industry and vacuum sintering.
Description
Technical Field
The invention relates to a method for bonding multiple materials of a large graphite heating element for producing a vacuum induction furnace, which is widely applied to the fields of military industry, photovoltaics, carbon-carbon compounding and vacuum equipment.
Background
Induction heating of graphite refers to a heating coil wound in a ring shape or other shape with a large current flowing therethrough, and is generally made of a copper tube. Therefore, a strong magnetic beam with polarity changing instantly is generated in the heating coil, the graphite heating element is placed in the coil, the magnetic beam penetrates the surface of the graphite heating element by about 20mm, and impedance is generated in the graphite heating element in the direction opposite to the heating current, so that a corresponding large eddy current is generated. Since the graphite heater has a resistance, a lot of joule heat is generated to rapidly increase the temperature of the graphite heater itself, thereby heating a desired product in the furnace by radiant heat.
Because the graphite material has good magnetic conductivity and can withstand the physical characteristic of high temperature, the graphite material is made into a graphite cylindrical heater with the wall thickness of 30mm-300mm according to the coil size and is used for vacuum induction heating. The product is widely applied to the fields of military industry, photovoltaics, carbon-carbon composite and vacuum equipment. However, only two carbon enterprises in Zibo City, Shandong province can produce graphite blanks with the diameter of 2000mm domestically, and the yield is extremely low and the selling price is ultrahigh. And no graphite blank with the diameter of more than 2000mm can be produced and processed by any enterprise so far, and the production and the research and the development of large-size products in the fields of carbon-carbon compounding, military industry, photovoltaic and vacuum sintering in China are seriously suppressed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for bonding a plurality of large graphite heating elements used for producing a vacuum induction furnace, which can produce graphite heating elements with the diameter of more than 2000mm, has high yield and is widely applied to the fields of domestic carbon-carbon compounding, military industry and vacuum sintering.
The technical scheme of the invention is as follows:
a method for bonding a plurality of materials of a large graphite heating element for producing a vacuum induction furnace comprises the following specific steps:
(1) preparing high-temperature graphite glue
The high-temperature graphite glue is formed by mixing a cementing agent and cementing powder;
the adhesive is prepared from 20-80 wt% furfuryl alcohol (molecular formula: C)5H6O2) 20 to 80 weight percent of Turkey acid TEA salt;
the cementing powder consists of 10 to 90 weight percent of superconducting carbon black and 10 to 90 weight percent of artificial stone ink powder;
when in use, the cementing agent and the cementing powder are mixed and prepared into paste according to the mass ratio of 1 (15-80) for standby;
(2) processing concatenation graphite heat-generating body
a. The large-scale graphite heating element is formed by splicing more than 5 graphite blocks according to the external dimension of the large-scale graphite heating element, wherein a T-shaped boss and a T-shaped clamping groove which are matched with each other are respectively arranged on two end faces of each graphite block, and two adjacent graphite blocks are mutually clamped and connected through the T-shaped boss and the T-shaped clamping groove; a 1mm-5mm glue filling gap is formed between the T-shaped boss and the T-shaped clamping groove which are mutually clamped, 5 threaded holes are formed in the upper end faces of the T-shaped boss and the T-shaped clamping groove which are mutually clamped, and the threaded holes are respectively formed in the middle of the T head of the T-shaped boss, the middle of the long vertical faces on two sides and the middle of the short vertical faces on two sides;
b. and (2) placing the spliced graphite heating body in a drying furnace, connecting the spliced graphite heating body with threaded holes of the graphite heating body respectively by using an injection valve of a high-pressure glue gun, fully filling the high-temperature graphite glue prepared in the step (1) into glue filling gaps of the spliced graphite heating body, filling the high-temperature graphite glue, pushing the graphite glue into the drying furnace, and drying at 100-400 ℃ for 10-30 hours to glue the spliced graphite heating body to obtain the large graphite heating body.
Furthermore, the diameter of the large graphite heating element is more than or equal to 2000 mm.
Furthermore, the number of the graphite blocks is 5-10, and the sizes of the graphite blocks are the same.
Furthermore, the cementing powder is composed of 50 wt% of superconducting carbon black and 50 wt% of superfine graphite powder, and the splicing seam resistivity of the large graphite heating body is low.
Furthermore, the cementing powder consists of 10-40 wt% of superconducting carbon black and 60-90 wt% of superfine graphite powder, and the splicing seam of the large graphite heating body has good tensile strength and breaking strength.
Furthermore, the cementing powder consists of 40 wt% of superconducting carbon black and 60 wt% of superfine graphite powder; the adhesive is prepared from 60 wt% furfuryl alcohol (molecular formula: C)5H6O2) 40 wt% of TEA salt of tall acid.
Further, the particle size of the cementing powder is 100-1000 meshes.
The invention has the beneficial effects that:
the high-temperature graphite adhesive is injected into a glue filling gap of the spliced graphite heating element through a high-pressure glue gun, a cementing agent and cementing powder are dehydrated to form a high-strength carbon chain to wrap the superfine artificial graphite powder and the superconducting carbon black, and the spliced graphite body is connected together by utilizing a reconstructed carbon net, so that the spliced graphite heating element is bonded; the super large graphite heating element with the diameter larger than or equal to 2000mm can be produced and processed according to the requirements of customers, the finished product rate is high and can reach 100%, and the domestic blank is filled. The high-temperature graphite adhesive after bonding and curing can be used in the environment of chlorine and acid and alkali; the maximum use temperature is 3000 ℃ in a vacuum or gas protection environment; the spliced graphite seam is detected to have the following indexes: the compressive strength is more than 10Mpa, the flexural strength is more than 4Mpa, the resistivity is increased by 8.5 mu omega m (1 channel seam), the resistivity of 5 channel seams can be controlled below 42.5 mu omega m, the normal heating of the graphite heating body can be ensured, and the graphite heating body is widely applied to the fields of domestic carbon-carbon composite, military industry, photovoltaic and vacuum sintering.
Drawings
FIG. 1 is a schematic diagram showing the splicing of the graphite heat-generating body of the present invention;
FIG. 2 is a schematic view of a graphite block of the graphite heat-generating body of the present invention;
fig. 3 is an enlarged view of a portion a of fig. 1.
In the figure: 1-graphite block, 101-clamping groove, 102-boss, 2-glue filling gap and 3-threaded hole.
Detailed Description
Example 1
(1) Preparing high-temperature graphite glue
The high-temperature graphite glue is formed by mixing a cementing agent and cementing powder;
the adhesive is prepared from 20 wt% furfuryl alcohol (molecular formula: C)5H6O2) 80 wt% of TEA salt of Turkey acid;
the cementing powder consists of 10 wt% of superconducting carbon black and 90 wt% of superfine artificial stone toner;
when in use, the cementing agent and 100-1000 mesh cementing powder are mixed according to the mass ratio of 1:80 to be prepared into paste for later use;
(2) processing concatenation graphite heat-generating body
a. The large-scale graphite heating element is formed by splicing 5 graphite blocks 1 according to the external dimension of the large-scale graphite heating element, the graphite blocks 1 are the same in dimension, the diameter of the large-scale graphite heating element is 2000mm, two end faces of each graphite block 1 are respectively provided with a T-shaped boss 102 and a T-shaped clamping groove 101 which are matched with each other, and two adjacent graphite blocks 1 are mutually clamped and connected through the T-shaped boss 102 and the T-shaped clamping groove 101; a 1mm glue filling gap 2 is arranged between the T-shaped boss 102 and the T-shaped clamping groove 101 which are mutually clamped, 5 threaded holes 3 are formed in the upper end faces of the T-shaped boss 102 and the T-shaped clamping groove 101 which are mutually clamped, and the threaded holes 3 are respectively formed in the middle of the T head of the T-shaped boss 102, the middle of the long vertical faces on two sides and the middle of the short vertical faces on two sides;
b. and (2) placing the spliced graphite heating body in a drying furnace, respectively connecting the glue injection valve of a high-pressure glue gun with a threaded hole 3 of the graphite heating body, fully filling the high-temperature graphite glue prepared in the step (1) into a glue filling gap 2 of the spliced graphite heating body, pushing the filled high-temperature graphite glue into the drying furnace, and drying at 100 ℃ for 30 hours to glue the spliced graphite heating body to obtain the large graphite heating body. The product can be normally used at the use temperature of 3000 ℃ in vacuum or gas protection environment.
Example 2
(1) Preparing high-temperature graphite glue
The high-temperature graphite glue is formed by mixing a cementing agent and cementing powder;
the adhesive is composed of 80 wt% furfuryl alcohol (molecular formula: C)5H6O2) 20 wt% of Turkey acid TEA salt;
the cementing powder consists of 20 wt% of superconducting carbon black and 80 wt% of superfine artificial stone toner;
when in use, the cementing agent and 100-1000 mesh cementing powder are mixed according to the mass ratio of 1:15 to be prepared into paste for later use;
(2) processing concatenation graphite heat-generating body
a. The large-scale graphite heating element is formed by splicing 5 graphite blocks 1 according to the external dimension of the large-scale graphite heating element, the graphite blocks 1 are the same in size, the diameter of the large-scale graphite heating element is 2000mm, two end faces of each graphite block 1 are respectively provided with a T-shaped boss 102 and a T-shaped clamping groove 101 which are matched with each other, and two adjacent graphite blocks 1 are mutually clamped and connected through the T-shaped bosses 102 and the T-shaped clamping grooves 101; a 1mm-5mm glue filling gap 2 is arranged between the T-shaped boss 102 and the T-shaped clamping groove 101 which are mutually clamped, 5 threaded holes 3 are formed in the upper end faces of the T-shaped boss 102 and the T-shaped clamping groove 101 which are mutually clamped, and the threaded holes 3 are respectively formed in the middle of the T head of the T-shaped boss 102, the middle of long vertical faces on two sides and the middle of short vertical faces on two sides;
b. and (2) placing the spliced graphite heating body in a drying furnace, respectively connecting the glue injection valve of a high-pressure glue gun with a threaded hole 3 of the graphite heating body, fully filling the high-temperature graphite glue prepared in the step (1) into a glue filling gap 2 of the spliced graphite heating body, pushing the filled high-temperature graphite glue into the drying furnace, and drying at 400 ℃ for 10 hours to glue the spliced graphite heating body to obtain the large graphite heating body. The product can be normally used at the use temperature of 3000 ℃ in vacuum or gas protection environment.
Example 3
(1) Preparing high-temperature graphite glue
The high-temperature graphite glue is formed by mixing a cementing agent and cementing powder;
the adhesive is prepared from 60 wt% furfuryl alcohol (molecular formula: C)5H6O2) 40 wt% of Turkey acid TEA salt;
the cementing powder consists of 40 wt% of superconducting carbon black and 60 wt% of superfine artificial graphite powder;
when in use, the cementing agent and 100-1000 mesh cementing powder are mixed according to the mass ratio of 1:50 to be prepared into paste for later use;
(2) processing concatenation graphite heat-generating body
a. The large-scale graphite heating element is formed by splicing 5 graphite blocks 1 according to the external dimension of the large-scale graphite heating element, the graphite blocks 1 are the same in size, the diameter of the large-scale graphite heating element is 2000mm, two end faces of each graphite block 1 are respectively provided with a T-shaped boss 102 and a T-shaped clamping groove 101 which are matched with each other, and two adjacent graphite blocks 1 are mutually clamped and connected through the T-shaped bosses 102 and the T-shaped clamping grooves 101; a 2mm glue filling gap 2 is arranged between the T-shaped boss 102 and the T-shaped clamping groove 101 which are mutually clamped, 5 threaded holes 3 are formed in the upper end faces of the T-shaped boss 102 and the T-shaped clamping groove 101 which are mutually clamped, and the threaded holes 3 are respectively formed in the middle of the T head of the T-shaped boss 102, the middle of the long vertical faces on two sides and the middle of the short vertical faces on two sides;
b. and (2) placing the spliced graphite heating body in a drying furnace, respectively connecting the glue injection valve of a high-pressure glue gun with a threaded hole 3 of the graphite heating body, fully filling the high-temperature graphite glue prepared in the step (1) into a glue filling gap 2 of the spliced graphite heating body, pushing the filled high-temperature graphite glue into the drying furnace, and drying at 200 ℃ for 25 hours to glue the spliced graphite heating body to obtain the large graphite heating body. The product can be normally used at the use temperature of 3000 ℃ in vacuum or gas protection environment.
Example 4
(1) Preparing high-temperature graphite glue
The high-temperature graphite glue is formed by mixing a cementing agent and cementing powder;
the adhesive is prepared from 50 wt% of furfuryl alcohol(s) ((Molecular formula C5H6O2) 50 wt% of Turkey acid TEA salt;
the cementing powder consists of 50 wt% of superconducting carbon black and 50 wt% of superfine artificial graphite powder;
when in use, the cementing agent and 100-1000 mesh cementing powder are mixed and prepared into paste according to the mass ratio of 1:40 for later use;
(2) processing concatenation graphite heat-generating body
a. The large-scale graphite heating element is formed by splicing 5 graphite blocks 1 according to the external dimension of the large-scale graphite heating element, the graphite blocks 1 are the same in dimension, the diameter of the large-scale graphite heating element is 2000mm, two end faces of each graphite block 1 are respectively provided with a T-shaped boss 102 and a T-shaped clamping groove 101 which are matched with each other, and two adjacent graphite blocks 1 are mutually clamped and connected through the T-shaped boss 102 and the T-shaped clamping groove 101; a 3mm glue filling gap 2 is arranged between the T-shaped boss 102 and the T-shaped clamping groove 101 which are mutually clamped, 5 threaded holes 3 are formed in the upper end faces of the T-shaped boss 102 and the T-shaped clamping groove 101 which are mutually clamped, and the threaded holes 3 are respectively formed in the middle of the T head of the T-shaped boss 102, the middle of the long vertical faces on two sides and the middle of the short vertical faces on two sides;
b. and (2) placing the spliced graphite heating body in a drying furnace, respectively connecting the glue injection valve of a high-pressure glue gun with a threaded hole 3 of the graphite heating body, fully filling the high-temperature graphite glue prepared in the step (1) into a glue filling gap 2 of the spliced graphite heating body, pushing the filled high-temperature graphite glue into the drying furnace, and drying at 300 ℃ for 20 hours to glue the spliced graphite heating body to obtain the large graphite heating body. The product can be normally used at the use temperature of 3000 ℃ in vacuum or gas protection environment.
Table 1 detection index table for graphite seam completed by splicing
The above description is only exemplary of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for bonding a plurality of materials of a large graphite heating element for producing a vacuum induction furnace is characterized by comprising the following steps: the method comprises the following specific steps:
(1) preparing high-temperature graphite glue
The high-temperature graphite glue is formed by mixing a cementing agent and cementing powder;
the adhesive consists of 20 to 80 weight percent of furfuryl alcohol and 20 to 80 weight percent of TEA salt of Tulai acid;
the cementing powder consists of 10 to 90 weight percent of superconducting carbon black and 10 to 90 weight percent of artificial stone ink powder;
when in use, the cementing agent and the cementing powder are mixed and prepared into paste according to the mass ratio of 1:15-1:80 for later use;
(2) processing concatenation graphite heat-generating body
a. The large-scale graphite heating element is formed by splicing more than 5 graphite blocks according to the external dimension of the large-scale graphite heating element, wherein a T-shaped boss and a T-shaped clamping groove which are matched with each other are respectively arranged on two end faces of each graphite block, and two adjacent graphite blocks are mutually clamped and connected through the T-shaped boss and the T-shaped clamping groove; a 1mm-5mm glue filling gap is formed between the T-shaped boss and the T-shaped clamping groove which are mutually clamped, 5 threaded holes are formed in the upper end faces of the T-shaped boss and the T-shaped clamping groove which are mutually clamped, and the threaded holes are respectively formed in the middle of the T head of the T-shaped boss, the middle of the long vertical faces on two sides and the middle of the short vertical faces on two sides;
b. and (2) placing the spliced graphite heating body in a drying furnace, connecting the spliced graphite heating body with threaded holes of the graphite heating body respectively by using an injection valve of a high-pressure glue gun, fully filling the high-temperature graphite glue prepared in the step (1) into glue filling gaps of the spliced graphite heating body, filling the high-temperature graphite glue, pushing the graphite glue into the drying furnace, and drying at 100-400 ℃ for 10-30 hours to glue the spliced graphite heating body to obtain the large graphite heating body.
2. The method for bonding a plurality of large graphite heating elements for manufacturing a vacuum induction furnace as set forth in claim 1, wherein: the diameter of the large graphite heating element is more than or equal to 2000 mm.
3. The method for bonding a plurality of large-sized graphite heating elements used for producing a vacuum induction furnace as set forth in claim 1, wherein: the number of the graphite blocks is 5-10, and the graphite blocks have the same size.
4. The method for bonding a plurality of large-sized graphite heating elements used for producing a vacuum induction furnace as set forth in claim 1, wherein: the cementing powder consists of 50 wt% of superconducting carbon black and 50 wt% of superfine graphite powder.
5. The method for bonding a plurality of large-sized graphite heating elements used for producing a vacuum induction furnace as set forth in claim 1, wherein: the cementing powder consists of 10 to 40 weight percent of superconducting carbon black and 60 to 90 weight percent of superfine graphite powder.
6. The method for bonding a plurality of large-sized graphite heating elements used for producing a vacuum induction furnace as set forth in claim 1, wherein: the cementing powder consists of 40 wt% of superconducting carbon black and 60 wt% of superfine graphite powder; the adhesive consists of 60 wt% of furfuryl alcohol and 40 wt% of TEA (tallowate).
7. The method for bonding a plurality of large-sized graphite heating elements used for producing a vacuum induction furnace as set forth in claim 1, wherein: the particle size of the cementing powder is 100-1000 meshes.
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| US7066258B2 (en) * | 2003-07-08 | 2006-06-27 | Halliburton Energy Services, Inc. | Reduced-density proppants and methods of using reduced-density proppants to enhance their transport in well bores and fractures |
| CN101549948A (en) * | 2009-05-14 | 2009-10-07 | 上海石创光学玻璃有限公司 | Grand specification quartz plate production technology. |
| FI20096036A0 (en) * | 2009-10-08 | 2009-10-08 | Upm Kymmene Wood Oy | Bio glue and wooden board |
| CN203558860U (en) * | 2013-10-30 | 2014-04-23 | 青岛隆盛晶硅科技有限公司 | Graphite protective plate applied to polycrystalline silicon directional solidification purification |
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