CN106435452A - Preparation method of gradient composite anti-wear coating layer - Google Patents
Preparation method of gradient composite anti-wear coating layer Download PDFInfo
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- CN106435452A CN106435452A CN201611015076.7A CN201611015076A CN106435452A CN 106435452 A CN106435452 A CN 106435452A CN 201611015076 A CN201611015076 A CN 201611015076A CN 106435452 A CN106435452 A CN 106435452A
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Abstract
The invention discloses a preparation method of a gradient composite anti-wear coating layer. The preparation method comprises the following steps: (1) performing sandblasting coarsening treatment on the surface of a base material; (2) washing the surface of the base material respectively with acetone and ethyl alcohol, and drying the surface at the temperature of 100 to 160 DEG C; (3) performing plasma spraying of a NiCrAl transitional layer on the surface of the base material by adopting atmospheric plasma spraying equipment, wherein the transitional layer is 0.1 to 0.3 mm in thickness; and (4) performing atmospheric plasma spraying of Al2O3-TiO2 mixed powder on the transitional layer to obtain an Al2O3-TiO2 gradient composite anti-wear coating layer, wherein the gradient composite anti-wear coating layer is 0.2 to 0.6 mm in thickness. The composite coating layer can enhance the wear resistance of a base body.
Description
Technical field
The present invention relates to field of material technology, more particularly to a kind of Al2O3-TiO2The preparation side of graded composite wear-resistant coating
Method.
Background technology
Abrasion is one of three kinds of main causes (abrasion, corrosion and fatigue) of metal parts failure.Economy caused by it
Loss is very huge, the numeral that such as U.S. announces for 1981, and the loss for being caused due to abrasion every year up to 100,000,000,000 is beautiful
Unit.Wherein about 20,000,000,000 dollars of material consumption, equivalent to the 7% of material annual production.As material wear ability is poor, China is big
The Loss of Life of amount fundamental parts generally significantly less than the level of external advanced product, therefore directly and indirectly economic loss
And it is very surprising.
Only with regard to metallurgical mine, agricultural machinery, coal, electric power and the incomplete statistics of five industrial departments of building materials, annual merely due to
Abrasive wear and the spare part that requires supplementation with just reaches 1,000,000 tons of steel, equivalent to 15～2,000,000,000 RMB.And for example mechanical industry is annual
Steel used, there are about half be consume in the production of spare part, and the major part in spare part be as wear-out life is not high and
Failure, such as from about 40% agricultural machinery and implement spare part is consumed due to abrasive wear, and about 30% seamless steel tube for boiler is ground due to corrosion
Loss effect.
In metallurgical mine production, the operating mode of machinery and use environment are very severe, and wear out failure is the master of mechanical failure
Want reason.By taking slurry pump as an example, it is used to remaining CHARACTERISTICS OF TAILINGS SAND mud after the washup that extracts, in mud containing part hardness relatively
Washed ore, grit and larger stone, and wherein also containing corrosive materials such as sulfur, need when transporting mud in addition
Pressure head that will be higher, therefore in pump, the speed of fluid is very high.With larger impulsive force.These working conditions determine Pulp pump
Using when to can bear the abrasion of various ways, have very high mechanical tenacity and intensity again, thus to pump flow passage components
Material propose very high requirement.But the performance of homogenous material be difficult to meet this to have a very high mechanical strength, and
Have the capability of doing sth the requirement of mill, corrosion resistant.
Hot-spraying technique and the generation of composite, are to solve this problem to open a piece of new prospect.For example, will be resistance to
Mill ceramic material is sprayed on impact-resistant metal material, and bi-material is learnt from other's strong points to offset one's weaknesses, and is had complementary advantages, can be met machinery and set
The standby mechanical load for increasingly improving and the rigors to abrasion resistance.
Thermal spraying composite anti-wear coating success it is critical only that wearability, but sprayed on material is had with the property of coating
Very big difference, so, selection can only be carried out according to the existing property of sprayed on material, the wearability as wear-resistant coating needs in a large number
Performance test checking.Wear-resistant coating quality is also affected with coating structure by spraying coating process except relevant with sprayed on material,
This is related to the bond strength of coating and residual thermal stress, high bond strength and the final mesh that low residual thermal stress is hot-spraying technique
's.
Content of the invention
It is an object of the invention to proposing a kind of preparation method of graded composite wear-resistant coating, the composite coating can be carried
The anti-wear performance of high matrix.
For reaching this purpose, the present invention is employed the following technical solutions：
A kind of preparation method of graded composite wear-resistant coating, which includes：
(1) substrate surface is carried out sandblasting roughening treatment；
(2) acetone and washing with alcohol substrate surface are used respectively, and dries at 100-160 DEG C；
(3) air plasma spraying equipment is adopted, plasma spraying NiCrAl transition zone, institute is carried out to the substrate surface
Transition region thickness is stated for 0.1-0.3mm；
(4) air plasma spraying Al is adopted on transition zone2O3-TiO2Mixed-powder, obtains Al2O3-TiO2Gradient is multiple
Wear-resistant coating is closed, the graded composite wear-resistant coating thickness is 0.2-0.6mm.
Al of the present invention2O3-TiO2Mixed-powder, which is nanoscale, and the two is with 10-3:1 weight is than mixing.
The air plasma spraying equipment of the present invention, is the known technology of this area, and the determination of its process conditions can
With according to the state of the art, or limited number of time test is determined, and the present invention is no longer defined with regard to which.
Air plasma spraying is that in all of hot-spraying technique, motility is most strong, and it can produce enough energy
Amount fusing any material.Spraying method can be divided into atmospheric plasma, atmosphere protection plasma, vacuum plasma and the steady plasma of water
Spraying etc..Spraying equipment is mainly made up of spray gun, powder feeder, DC source, control system, heat exchanger and pipe-line system.By
Use powder as coating material in plasma spraying, the quantity of the coating material that can use in plasma spray coating process is several
It is unlimited.Hf electric arc is lighted between anode (nozzle) and negative electrode (electrode), the process gas for flowing therebetween is (generally
Mixture for argon, nitrogen, hydrogen and helium) plume that is ionized as thermal plasma gas, so as to exceed sun surface
6,600 DEG C to 16,600 DEG C of temperature.After coating material is injected into gas plume, material is melted and is fired to target base
Body.
The energy that the electric current co- controlling technique for applying on the process gas for using and electrode is produced.Due to can be to every kind of
Gas and electric current used are accurately adjusted, so coating result can repeat and predict.Meanwhile, material is launched into plume
Place and angle and spray gun can also be controlled to the distance of target, produce appropriate material spraying ginseng so as to high flexible
Number, expands the temperature range of fusing.
The distance of plasma gun and target part, the relative velocity of spray gun and part and part are cooled down (generally by collection
In target matrix the help sprayed of air), typically the spraying temperature of part is controlled at 38 DEG C to 260 DEG C.
Preferably, base material of the present invention is impeller or the housing of Pulp pump.I.e.：
The NiCrAl primer is commercially available prod, and those skilled in the art can be commercially available, or oneself processing
Prepare.For example, according to 1-3:1-3:The atomic ratio of 1-3 is compounding to be obtained.
The present invention adopts SiC-TiO2Combination, and arrange in NiCrAl between substrate surface and the gradient composite coating
Between coating so that coating wear resistant corrosion resistant, and strong with adhesion.SiC is due to stable chemical performance, heat conductivity height, thermal expansion
Coefficient is little, anti-wear performance is good, silicon carbide powder is coated the inwall of turbine impeller or cylinder block, its wearability can be improved and
Increase the service life 1～2 times；While which is heat-resisting, resistance to thermal shock, small volume, lightweight and intensity is high, good energy-conserving effect.Carborundum
Hardness very big, Mohs' hardness be 9.5 grades, be only second to diamond (10 grades) most hard in the world, with excellent heat conductivility.
Its not only anti-wear performance outstanding, while with extremely strong Corrosion Protection.
The present invention adopts air plasma spraying technique, compared to other hot-spraying techniques, is particularly suitable for the present invention
Slurry pump impeller and the irregular component such as housing, and the technique coordinated with the certain material of the present invention, the coating heavily fortified point for obtaining
Reinforce and lean on, anticorrosive wear-resistant.
The graded composite wear-resistant coating matrix that the present invention is obtained is placed in water sand mixture, carries out rotation wear test,
After 24 hours, weigh, and be compared with weight before abrasion, abrasion loss rate is less than 0.01%, and system of the present invention is described
The standby composite coating for obtaining is wear-resisting and is tightly combined firmly with matrix.
Specific embodiment
Technical scheme is further illustrated below by specific embodiment.
Embodiment 1
A kind of impeller of Pulp pump or housing Al2O3-TiO2The preparation method of graded composite wear-resistant coating, which includes：
(1) substrate surface is carried out sandblasting roughening treatment；
(2) acetone and washing with alcohol substrate surface are used respectively, and dries at 100-160 DEG C；
(3) air plasma spraying equipment is adopted, plasma spraying NiCrAl transition zone, institute is carried out to the substrate surface
Transition region thickness is stated for 0.1mm；
(4) air plasma spraying Al is adopted on transition zone2O3-TiO2Mixed-powder, the two ratio is 10:1, obtain
Al2O3-TiO2Graded composite wear-resistant coating, the graded composite wear-resistant coating thickness is 0.2mm.
Embodiment 2
A kind of impeller of Pulp pump or housing Al2O3-TiO2The preparation method of graded composite wear-resistant coating, which includes：
(1) substrate surface is carried out sandblasting roughening treatment；
(2) acetone and washing with alcohol substrate surface are used respectively, and dries at 100-160 DEG C；
(3) air plasma spraying equipment is adopted, plasma spraying NiCrAl transition zone, institute is carried out to the substrate surface
Transition region thickness is stated for 0.3mm；
(4) air plasma spraying Al is adopted on transition zone2O3-TiO2Mixed-powder, the two ratio is 10:1, obtain
Al2O3-TiO2Graded composite wear-resistant coating, the graded composite wear-resistant coating thickness is 0.6mm.
Embodiment 3
A kind of impeller of Pulp pump or housing Al2O3-TiO2The preparation method of graded composite wear-resistant coating, which includes：
(1) substrate surface is carried out sandblasting roughening treatment；
(2) acetone and washing with alcohol substrate surface are used respectively, and dries at 100-160 DEG C；
(3) air plasma spraying equipment is adopted, plasma spraying NiCrAl transition zone, institute is carried out to the substrate surface
Transition region thickness is stated for 0.2mm；
(4) air plasma spraying Al is adopted on transition zone2O3-TiO2Mixed-powder, the two ratio is 5:1, obtain
Al2O3-TiO2Graded composite wear-resistant coating, the graded composite wear-resistant coating thickness is 0.4mm.
The graded composite wear-resistant coating matrix that embodiment 1-3 is obtained is placed in water sand mixture, carries out rotation abrasion examination
Test, after 24 hours, weigh, and be compared with weight before abrasion, abrasion loss rate is less than 0.01%, and embodiment is described
Composite coating that 1-3 is prepared is wear-resisting and is tightly combined firmly with matrix.
Claims (3)
1. a kind of preparation method of graded composite wear-resistant coating, which includes：
(1) substrate surface is carried out sandblasting roughening treatment；
(2) acetone and washing with alcohol substrate surface are used respectively, and dries at 100-160 DEG C；
(3) air plasma spraying equipment is adopted, plasma spraying NiCrAl transition zone, the mistake is carried out to the substrate surface
Thickness degree is crossed for 0.1-0.3mm；
(4) air plasma spraying Al is adopted on transition zone2O3-TiO2Mixed-powder, obtains Al2O3-TiO2Graded composite is resistance to
Mill coating, the graded composite wear-resistant coating thickness is 0.2-0.6mm.
2. Al as claimed in claim 12O3-TiO2The preparation method of graded composite wear-resistant coating, it is characterised in that described
Base material is impeller or the housing of Pulp pump.
3. the preparation method of graded composite wear-resistant coating as claimed in claim 1 or 2, it is characterised in that described Al2O3-
TiO2Mixed-powder, which is nanoscale, and the two is with 10-3:1 weight is than mixing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611015076.7A CN106435452A (en) | 2016-11-18 | 2016-11-18 | Preparation method of gradient composite anti-wear coating layer |
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| CN201611015076.7A CN106435452A (en) | 2016-11-18 | 2016-11-18 | Preparation method of gradient composite anti-wear coating layer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107937859A (en) * | 2017-11-08 | 2018-04-20 | 蚌埠市华鼎机械科技有限公司 | A kind of maintenance process on the cast welding machine surface for lead-acid storage battery production |
| CN114032487A (en) * | 2021-11-02 | 2022-02-11 | 嘉兴市瑞佳机械科技有限公司 | Processing technology of wear-resistant coating of textile machinery accessory |
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| CN102433527A (en) * | 2011-12-16 | 2012-05-02 | 北京工业大学 | High-wear-resistance steel roller of belt conveyor and preparation method |
| CN103205667A (en) * | 2013-04-03 | 2013-07-17 | 北京工业大学 | Thermal spraying composite coating material for piston ring and preparation method of thermal spraying composite coating material |
| CN103540890A (en) * | 2012-07-09 | 2014-01-29 | 中国科学院微电子研究所 | Preparation method of boron carbide-silicon carbide composite coating |
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2016
- 2016-11-18 CN CN201611015076.7A patent/CN106435452A/en active Pending
Patent Citations (4)
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| CN102094165A (en) * | 2010-12-27 | 2011-06-15 | 北京工业大学 | Highly wear-resistant mechanical seal moving ring and manufacturing method thereof |
| CN102433527A (en) * | 2011-12-16 | 2012-05-02 | 北京工业大学 | High-wear-resistance steel roller of belt conveyor and preparation method |
| CN103540890A (en) * | 2012-07-09 | 2014-01-29 | 中国科学院微电子研究所 | Preparation method of boron carbide-silicon carbide composite coating |
| CN103205667A (en) * | 2013-04-03 | 2013-07-17 | 北京工业大学 | Thermal spraying composite coating material for piston ring and preparation method of thermal spraying composite coating material |
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| CN107937859A (en) * | 2017-11-08 | 2018-04-20 | 蚌埠市华鼎机械科技有限公司 | A kind of maintenance process on the cast welding machine surface for lead-acid storage battery production |
| CN114032487A (en) * | 2021-11-02 | 2022-02-11 | 嘉兴市瑞佳机械科技有限公司 | Processing technology of wear-resistant coating of textile machinery accessory |
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