CN106756734A - A kind of preparation method of TiN NiCrAl graded composite wear-resistant coatings - Google Patents
A kind of preparation method of TiN NiCrAl graded composite wear-resistant coatings Download PDFInfo
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- CN106756734A CN106756734A CN201611015359.1A CN201611015359A CN106756734A CN 106756734 A CN106756734 A CN 106756734A CN 201611015359 A CN201611015359 A CN 201611015359A CN 106756734 A CN106756734 A CN 106756734A
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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
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- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a kind of preparation method of TiN NiCrAl graded composite wear-resistant coatings, it includes：(1) substrate surface is carried out into sandblasting roughening treatment；(2) substrate surface is washed with acetone and ethanol respectively, and is dried at 100 160 DEG C；(3) air plasma spraying equipment is used, plasma spraying NiCrAl transition zones is carried out to the substrate surface, the transition region thickness is 0.1 0.3mm；(4) air plasma spraying TiN NiCrAl mixed-powders are used on transition zone, TiN NiCrAl graded composite wear-resistant coatings are obtained, the graded composite wear-resistant coating thickness is 0.2 0.6mm.The composite coating can improve the anti-wear performance of matrix.
Description
Technical field
The present invention relates to field of material technology, more particularly to a kind of preparation side of TiN-NiCrAl graded composites 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 it is beautiful that the loss for being caused due to abrasion every year is up to 100,000,000,000
Unit.Wherein material consumption is about 20,000,000,000 dollars, equivalent to the 7% of material annual production.Because material wear ability is poor, China is big
The Loss of Life of fundamental parts is measured generally significantly less than the level of external advanced product, therefore directly and indirectly economic loss
It is also very surprising.
Only with regard to metallurgical mine, agricultural machinery, coal, five incomplete statistics of industrial department of electric power and building materials, it is annual merely due to
Abrasive wear and the spare part that requires supplementation with just up to 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 is consumed in the production of spare part, and the major part in spare part is because wear-out life is not high
Failure, such as from about 40% agricultural machinery and implement spare part is that about 30% seamless steel tube for boiler is because corrosion is ground due to abrasive wear consumption
Loss effect.
In metallurgical mine production, the operating mode and use environment of machinery are very severe, and wear out failure is the master of mechanical failure
Want reason.By taking slurry pump as an example, it is the remaining CHARACTERISTICS OF TAILINGS SAND mud after the washup extracted, in mud containing part hardness compared with
Washed ore high, grit and larger stone, and wherein needed when transporting mud in addition also containing corrosive materials such as sulphur
Pressure head that will be higher, thus in pump fluid speed it is very high.With larger impulsive force.These working conditions determine Pulp pump
The abrasion of diversified forms can be born when in use, there is mechanical tenacity and intensity very high again, thus to pump flow passage components
Material propose requirement very high.But the performance of homogenous material be difficult to meet it is this to have a mechanical strength very high, and
Have the capability of doing sth the requirement of mill, corrosion resistant.
The generation of hot-spraying technique and composite, a piece of new prospect is opened to solve this problem.For example, will be resistance to
Mill ceramic material is sprayed on impact-resistant metal material, and two kinds of materials are learnt from other's strong points to offset one's weaknesses, and is had complementary advantages, and can be met machinery and be 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 has 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 largely
Performance test checking.Wear-resistant coating quality is also influenceed by spraying coating process except relevant with sprayed on material with coating structure,
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.
The content of the invention
It is an object of the invention to propose a kind of preparation method of graded composite wear-resistant coating, the composite coating can be carried
The anti-wear performance of matrix high.
It is that, up to this purpose, the present invention uses following technical scheme：
A kind of preparation method of TiN-NiCrAl graded composites wear-resistant coating, it includes：
(1) substrate surface is carried out into sandblasting roughening treatment；
(2) substrate surface is washed with acetone and ethanol respectively, and is dried at 100-160 DEG C；
(3) air plasma spraying equipment is used, plasma spraying NiCrAl transition zones, institute is carried out to the substrate surface
Transition region thickness is stated for 0.1-0.3mm；
(4) air plasma spraying TiN-NiCrAl mixed-powders are used on transition zone, TiN-NiCrAl gradients are obtained
Composite anti-wear coating, the graded composite wear-resistant coating thickness is 0.2-0.6mm.
The present invention uses NiCrAl compared to other graded composite wear-resistant coatings in its working lining, and the NiCrAl is
One of buffer layer material.By the particular design so that with reference to even closer between working lining and transition zone, increased coating
Fastness so that transition zone is not easily disconnected from working lining, increases its anti-wear performance and reliability.
The present invention has good, the good conduction of high rigidity, low-friction coefficient, adhesion strength high, chemical stability using TiN
The advantages of property and the similar thermal expansion coefficient with ferrous materials, so as to be widely used in machinery, material, chemical industry, electronics, metallurgy
Deng field.
TiN-NiCrAl mixed-powders of the present invention, it is nanoscale, and the two is with 1:The weight of 2-6 is than mixing.
The air plasma spraying equipment of the invention, is the known technology of this area, and the determination of its process conditions can
It is determined with according to the state of the art, or limited number of time experiment, the present invention is no longer defined with regard to it.
Air plasma spraying is flexibility is most strong in all of hot-spraying technique one, 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 be used 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
It is the mixture of argon gas, nitrogen, hydrogen and helium) plume for thermal plasma gas is ionized, 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 process gas for using is produced with the electric current co- controlling technique of applying on electrode.Due to can be to every kind of
Gas and electric current used are accurately adjusted, so coating result can be repeated and predicted.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 to join 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 the impeller or housing of Pulp pump.I.e.：
The NiCrAl primers are 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 compounding of 1-3 is obtained.
The present invention sets NiCrAl using TiN-NiCrAl combinations between substrate surface and the gradient composite coating
Inter coat so that coating wear resistant corrosion resistant, and it is strong with adhesion.
The present invention uses 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 coordinates with certain material of the invention, and the coating for obtaining is hard
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,
By after 24 hours, weighing, and it is compared with the weight before abrasion, abrasion loss rate is less than 0.001%, illustrates present invention system
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 the preparation method of housing TiN-NiCrAl graded composite wear-resistant coatings, it includes：
(1) substrate surface is carried out into sandblasting roughening treatment；
(2) substrate surface is washed with acetone and ethanol respectively, and is dried at 100-160 DEG C；
(3) air plasma spraying equipment is used, plasma spraying NiCrAl transition zones, institute is carried out to the substrate surface
Transition region thickness is stated for 0.1mm；
(4) air plasma spraying TiN-NiCrAl mixed-powders are used on transition zone, the two ratio is 10:1, obtain
TiN-NiCrAl graded composite wear-resistant coatings, the graded composite wear-resistant coating thickness is 0.2mm.
Embodiment 2
A kind of impeller of Pulp pump or the preparation method of housing TiN-NiB graded composite wear-resistant coatings, it includes：
(1) substrate surface is carried out into sandblasting roughening treatment；
(2) substrate surface is washed with acetone and ethanol respectively, and is dried at 100-160 DEG C；
(3) air plasma spraying equipment is used, plasma spraying NiCrAl transition zones, institute is carried out to the substrate surface
Transition region thickness is stated for 0.3mm；
(4) air plasma spraying TiN-NiCrAl mixed-powders are used on transition zone, the two ratio is 10:1, obtain
TiN-NiCrAl graded composite wear-resistant coatings, the graded composite wear-resistant coating thickness is 0.6mm.
Embodiment 3
A kind of impeller of Pulp pump or the preparation method of housing TiN-NiCrAl graded composite wear-resistant coatings, it includes：
(1) substrate surface is carried out into sandblasting roughening treatment；
(2) substrate surface is washed with acetone and ethanol respectively, and is dried at 100-160 DEG C；
(3) air plasma spraying equipment is used, plasma spraying NiCrAl transition zones, institute is carried out to the substrate surface
Transition region thickness is stated for 0.2mm；
(4) air plasma spraying TiN-NiCrAl mixed-powders are used on transition zone, the two ratio is 5:1, obtain
TiN-NiCrAl graded composite wear-resistant coatings, 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, by after 24 hours, weighing, and be compared with the weight before abrasion, abrasion loss rate is less than 0.01%, illustrates embodiment
The 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 TiN-NiCrAl graded composites wear-resistant coating, it includes：
(1) substrate surface is carried out into sandblasting roughening treatment；
(2) substrate surface is washed with acetone and ethanol respectively, and is dried at 100-160 DEG C；
(3) air plasma spraying equipment is used, plasma spraying NiCrAl transition zones, the mistake is carried out to the substrate surface
Thickness degree is crossed for 0.1-0.3mm；
(4) air plasma spraying TiN-NiCrAl mixed-powders are used on transition zone, TiN-NiCrAl graded composites are obtained
Wear-resistant coating, the graded composite wear-resistant coating thickness is 0.2-0.6mm；
Described TiN-NiCrAl mixed-powders, it is nanoscale, and the two is with 1:The weight of 2-6 is than mixing.
2. the preparation method of TiN-NiCrAl graded composites wear-resistant coating as claimed in claim 1, it is characterised in that described
Base material is the impeller or housing of Pulp pump.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611015359.1A CN106756734A (en) | 2016-11-18 | 2016-11-18 | A kind of preparation method of TiN NiCrAl graded composite wear-resistant coatings |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455301A (en) * | 2020-04-24 | 2020-07-28 | 常州大学 | Wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of outer cylinder of measurement-while-drilling instrument |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104018109A (en) * | 2014-05-07 | 2014-09-03 | 南京航空航天大学 | Rare-earth doped/modified alumina-titania composite coating and preparation method thereof |
-
2016
- 2016-11-18 CN CN201611015359.1A patent/CN106756734A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104018109A (en) * | 2014-05-07 | 2014-09-03 | 南京航空航天大学 | Rare-earth doped/modified alumina-titania composite coating and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 张本等: "陶瓷/金属复合耐磨涂层的性能评价", 《武汉理工大学学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455301A (en) * | 2020-04-24 | 2020-07-28 | 常州大学 | Wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of outer cylinder of measurement-while-drilling instrument |
| CN111455301B (en) * | 2020-04-24 | 2022-03-25 | 常州大学 | Wear-resistant corrosion-resistant high-entropy alloy gradient composite coating of outer cylinder of measurement-while-drilling instrument |
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