CN106435453A - Preparation method of gradient composite abrasion-resistant coating - Google Patents
Preparation method of gradient composite abrasion-resistant coating Download PDFInfo
- Publication number
- CN106435453A CN106435453A CN201611015087.5A CN201611015087A CN106435453A CN 106435453 A CN106435453 A CN 106435453A CN 201611015087 A CN201611015087 A CN 201611015087A CN 106435453 A CN106435453 A CN 106435453A
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- CN
- China
- Prior art keywords
- nicrbsi
- resistant coating
- plasma spraying
- preparation
- wear
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
Abstract
The invention discloses a preparation method of a gradient composite abrasion-resistant coating. The preparation method comprises the steps of (1) carrying out sand blasting roughening on the surface of a base material; (2) washing the surface of the base material with acetone and ethyl alcohol, and drying the base material at the temperature of 100 DEG C to 160 DEG C; (3) carrying out plasma spraying on the surface of the base material through adopting an atmospheric plasma spraying device to form an NiCrBSi transition layer, wherein the transition layer is 0.1 mm to 0.3 mm in thickness; and (4) spraying WC-NiCrBSi-Si3N4 mixed powder on the transition layer through atmospheric plasma spraying, so as to obtain the WC-NiCrBSi-Si3N4 gradient composite abrasion-resistant coating, wherein the gradient composite abrasion-resistant coating is 0.2 mm to 0.6 mm in thickness. According to the composite coating, the abrasion resistance of a matrix can be improved.
Description
Technical field
The present invention relates to field of material technology, more particularly to a kind of WC-NiCrBSi-Si3N4Graded composite wear-resistant coating
Preparation 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 NiCrBSi transition zone is carried out to the substrate surface,
The transition region thickness is 0.1-0.3mm;
(4) air plasma spraying WC-NiCrBSi-Si is adopted on transition zone3N4Mixed-powder, obtains WC-
NiCrBSi-Si3N4Graded composite wear-resistant coating, the graded composite wear-resistant coating thickness is 0.2-0.6mm.
The present invention adopts NiCrBSi compared to other graded composite wear-resistant coatings in its working lining, and the NiCrBSi
It is one of buffer layer material.By the particular design so that with reference to even closer between working lining and transition zone, increased painting
The fastness of layer so that transition zone is not easily disconnected from working lining, increases its anti-wear performance and reliability.
WC-NiCrBSi-Si of the present invention3N4Mixed-powder, which is nanoscale, with 1:2-6:The weight ratio of 0.5-2
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.:
Compared to other bond coatings, the present invention is using NiCrBSi as bond coating, and which serves reduction heat treatment
Temperature, improve the effect that matrix is connected property with working lining, realize good combination.
NiCrBSi of the present invention, between its each composition, ratio does not do specific restriction, as long as each composition reaches effectively
Amount.For example, its content is Cr 14-18wt%, B 3-4.5wt%, Si 3.5-5.5wt%, Ni surplus.
The present invention adopts WC-NiCrBSi-Si3N4Combination, and arrange between substrate surface and the gradient composite coating
NiCrBSi inter coat so that coating wear resistant corrosion resistant, and strong with adhesion.
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 0.001%, 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 WC-NiCrBSi-Si3N4The preparation method of graded composite wear-resistant coating, its bag
Include:
(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 NiCrBSi transition zone is carried out to the substrate surface,
The transition region thickness is 0.1mm;
(4) air plasma spraying WC-NiCrBSi-Si is adopted on transition zone3N4Mixed-powder, ratio is 10:1:
0.5, obtain WC-NiCrBSi-Si3N4Graded 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 WC-NiCrBSi-Si3N4The preparation method of graded composite wear-resistant coating, its bag
Include:
(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 NiCrBSi transition zone is carried out to the substrate surface,
The transition region thickness is 0.3mm;
(4) air plasma spraying WC-NiCrBSi-Si is adopted on transition zone3N4Mixed-powder, the two ratio is 10:
1:2, obtain WC-NiCrBSi-Si3N4Graded 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 WC-NiCrBSi-Si3N4The preparation method of graded composite wear-resistant coating, its bag
Include:
(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 NiCrBSi transition zone is carried out to the substrate surface,
The transition region thickness is 0.2mm;
(4) air plasma spraying WC-NiCrBSi-Si is adopted on transition zone3N4Mixed-powder, ratio is 5:1:1, obtain
To WC-NiCrBSi-Si3N4Graded 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 (2)
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 NiCrBSi transition zone is carried out to the substrate surface, described
Transition region thickness is 0.1-0.3mm;
(4) air plasma spraying WC-NiCrBSi-Si is adopted on transition zone3N4Mixed-powder, obtains WC-NiCrBSi-
Si3N4Graded composite wear-resistant coating, the graded composite wear-resistant coating thickness is 0.2-0.6mm;
Described WC-NiCrBSi-Si3N4Mixed-powder, which is nanoscale, with 1:2-6:The weight of 0.5-2 is than mixing.
2. the preparation method of graded composite wear-resistant coating as claimed in claim 1, it is characterised in that described base material be
The impeller of pump or housing.
Priority Applications (1)
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CN201611015087.5A CN106435453A (en) | 2016-11-18 | 2016-11-18 | Preparation method of gradient composite abrasion-resistant coating |
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CN201611015087.5A CN106435453A (en) | 2016-11-18 | 2016-11-18 | Preparation method of gradient composite abrasion-resistant coating |
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CN106435453A true CN106435453A (en) | 2017-02-22 |
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CN201611015087.5A Pending CN106435453A (en) | 2016-11-18 | 2016-11-18 | Preparation method of gradient composite abrasion-resistant coating |
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Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103422048A (en) * | 2012-05-14 | 2013-12-04 | 中国科学院上海硅酸盐研究所 | High abrasion resistant boron carbide coating layer and preparation method thereof |
-
2016
- 2016-11-18 CN CN201611015087.5A patent/CN106435453A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103422048A (en) * | 2012-05-14 | 2013-12-04 | 中国科学院上海硅酸盐研究所 | High abrasion resistant boron carbide coating layer and preparation method thereof |
Non-Patent Citations (1)
Title |
---|
覃峰等: "陶瓷/金属复合耐磨涂层的微观结构与磨损性能分析", 《中国表面工程》 * |
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