CN112323007A - Supersonic flame spraying self-lubricating wear-resistant coating process - Google Patents
Supersonic flame spraying self-lubricating wear-resistant coating process Download PDFInfo
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- CN112323007A CN112323007A CN202011067626.6A CN202011067626A CN112323007A CN 112323007 A CN112323007 A CN 112323007A CN 202011067626 A CN202011067626 A CN 202011067626A CN 112323007 A CN112323007 A CN 112323007A
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- 238000000576 coating method Methods 0.000 title claims abstract description 42
- 238000010285 flame spraying Methods 0.000 title claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 100
- 229910052961 molybdenite Inorganic materials 0.000 claims abstract description 36
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims abstract description 36
- 229910003470 tongbaite Inorganic materials 0.000 claims abstract description 35
- 238000005507 spraying Methods 0.000 claims abstract description 34
- 239000007921 spray Substances 0.000 claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000007781 pre-processing Methods 0.000 claims abstract description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 42
- 239000004576 sand Substances 0.000 claims description 42
- 238000007664 blowing Methods 0.000 claims description 32
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 239000001301 oxygen Substances 0.000 claims description 21
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- 239000001294 propane Substances 0.000 claims description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 14
- 238000000498 ball milling Methods 0.000 claims description 12
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- 239000010431 corundum Substances 0.000 claims description 10
- 229910052593 corundum Inorganic materials 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical group S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 17
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 238000004140 cleaning Methods 0.000 description 8
- 238000005238 degreasing Methods 0.000 description 8
- 238000005488 sandblasting Methods 0.000 description 8
- 230000003746 surface roughness Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- 239000011651 chromium Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
Abstract
The invention relates to a supersonic flame spraying self-lubricating wear-resistant coating process, which comprises the following steps: CrNi-Cr3C2Powder, Ni powder and Ni-MoS2Uniformly mixing the powder to prepare spraying powder; in the spray powder, the CrNi-Cr3C2The weight ratio of the powder is 50-70 percent, and the Ni-MoS2The weight ratio of the powder is 10 to 20 percent; the balance being Ni powder; the CrNi-Cr3C2Powder and Ni-MoS2The powder is coated powder; preprocessing a workpiece to be sprayed; and (4) spraying. Coated CrNi-Cr3C2、Ni‑MoS2Can effectively avoid Cr3C2And MoS2Is oxidized in the spraying process to improve Cr3C2And MoS2The bonding strength with the coating is favorable for improving the wear resistance and the self-lubricating property of the coating.
Description
Technical Field
The invention relates to a high-speed spraying technology, in particular to a supersonic flame spraying self-lubricating wear-resistant coating process.
Background
Sliding parts such as airplane bearing journals, landing gears, flap guide rails and the like require materials with high specific strength and good wear resistance, and high-strength base materials are generally adopted and wear-resistant coatings are sprayed on the surfaces of the base materials to meet the requirements. Although the existing coatings such as tungsten carbide, chromium carbide and the like have good wear resistance, the friction coefficient is high, a large amount of friction heat is generated in the sliding process, the friction heat is easy to accumulate at the interface of a base material and the coating, and the service life of a sliding part is shortened.
Disclosure of Invention
Based on the above, there is a need for a supersonic flame spraying self-lubricating wear-resistant coating process, which can spray a coating with high wear resistance and low friction coefficient.
A supersonic flame spraying self-lubricating wear-resistant coating process comprises the following steps:
CrNi-Cr3C2Powder, Ni powder and Ni-MoS2Uniformly mixing the powder to prepare spraying powder;
the CrNi-Cr3C2The weight ratio of the powder is 50-70 percent, and the Ni-MoS2The weight ratio of the powder is 10 to 20 percent; the balance being Ni powder; the CrNi-Cr3C2Powder and Ni-MoS2The powder is coated powder;
preprocessing a workpiece to be sprayed;
and (4) spraying.
Preferably, in the spray powder, the CrNi-Cr3C260-70% of powder by weight and Ni-MoS2The weight ratio of the powder is 10 to 20 percent; the balance being Ni powder.
Preferably, the CrNi-Cr3C2Cr in powder3C225-50% of CrNi in weight ratio and the balance of CrNi; the Ni-MoS2Wherein the weight ratio of Ni is 25 percent, and the balance is MoS2。
In some of these embodiments, the CrNi-Cr3C2The particle size of the powder is 11-45 mu m, the particle size of the Ni powder is 10-50 mu m, and the Ni-MoS2The particle size is 48 to 75 μm.
In some of these embodiments, the CrNi-Cr3C2Powder, Ni powder and Ni-MoS2Powder mixtureThe mixing method is ball milling mixing, the rotating speed of the ball mill is 250-300 r/min, and the ball milling time is 4 hours.
In some of these embodiments, the spray process parameters are: the spraying distance is 250-300 mm, the powder feeding speed is 30-40 g/min, the oxygen pressure is 1.2Mpa, the oxygen flow is 200-300L/min, the propane pressure is 0.6Mpa, and the propane flow is 80-120L/min.
In some embodiments, the workpiece base material to be sprayed is low-alloy ultrahigh-strength steel.
In some embodiments, the pretreatment of the workpiece to be sprayed comprises a step of blowing sand on the surface of the workpiece, wherein the process parameters of the sand blowing step are as follows: corundum sand with the diameter of 0.3-0.8 mm is adopted, and the sand blowing pressure is 0.4-0.5 MPa; and blowing sand until the roughness of the surface of the workpiece reaches Ra3.0-3.8 mu m.
Further, the invention also provides a self-lubricating wear-resistant coating sprayed by the method.
The invention has the beneficial effects that:
the invention adopts coated CrNi-Cr3C2、Ni-MoS2Coating CrNi-Cr powder mixed with Ni powder as spraying powder3C2、Ni-MoS2Can effectively avoid Cr3C2And MoS2Oxidized in the spraying process, and also improves Cr3C2And MoS2The bonding strength of the Ni powder and the coating is improved, the bonding strength of the coating and the base material and the density of the coating are improved, and the wear resistance and the self-lubricating property of the coating are improved. Microhardness (HV) of the coating sprayed by this process0.3) 537 or more, 52.8MPa or more in bonding strength, 0.386 or less in friction coefficient and excellent comprehensive performance.
Detailed Description
Coated CrNi-Cr in examples and comparative examples3C2The average particle size of the powder was 30 μm, Cr3C2The weight ratio is 25%. The average particle diameter of the Ni powder was 10 μm. Coated Ni-MoS2Has an average particle diameter of 50 μm. Spraying by a Diamond Jet spray gun, and adopting low-alloy high-strength steel Q345 as a base material.
Example 1
The embodiment provides a supersonic flame spraying self-lubricating wear-resistant coating process, which comprises the following steps:
s1, preparing a spray powder: 500g of coated CrNi-Cr3C2Powder, 100g coated Ni-MoS2Mixing the powder and 400gNi powder in a planetary ball mill, wherein the rotating speed of the planetary ball mill is 250r/min, and the ball milling time is 4h, thus obtaining the spraying powder.
S2, workpiece pretreatment: and carrying out sand blowing treatment on the low-alloy high-strength steel after integral steam degreasing, wherein the sand blowing adopts corundum sand with the diameter of 0.5mm, the pressure is 0.5MPa, the distance is 180mm, and the sand blowing is carried out until the surface roughness reaches Ra3.8 mu m. And cleaning the steel surface by acetone and industrial alcohol after sand blasting.
S3, spraying: the spraying process parameters are that the spraying distance is 300mm, the powder feeding speed is 40g/min, the oxygen pressure is 1.2Mpa, the oxygen flow is 300L/min, the propane pressure is 0.6Mpa, and the propane flow is 80L/min.
Example 2
The embodiment provides a supersonic flame spraying self-lubricating wear-resistant coating process, which comprises the following steps:
s1, preparing a spray powder: 600g of coated CrNi-Cr3C2Powder, 150g coated Ni-MoS2Mixing the powder and 250gNi powder in a planetary ball mill, wherein the ball-material ratio is 3:1, the rotating speed of the planetary ball mill is 250r/min, and the ball milling time is 4h, thus obtaining the spray powder.
S2, workpiece pretreatment: and carrying out sand blowing treatment on the low-alloy high-strength steel after integral steam degreasing, wherein the sand blowing adopts corundum sand with the diameter of 0.5mm, the pressure is 0.5MPa, the distance is 180mm, and the sand blowing is carried out until the surface roughness reaches Ra3.8 mu m. And cleaning the steel surface by acetone and industrial alcohol after sand blasting.
S3, spraying: the spraying distance is 280mm, the powder feeding speed is 35g/min, the oxygen pressure is 1.2Mpa, the oxygen flow is 350L/min, the propane pressure is 0.6Mpa, and the propane flow is 100L/min.
Example 3
The embodiment provides a supersonic flame spraying self-lubricating wear-resistant coating process, which comprises the following steps:
s1, preparing a spray powder: 600g of coated CrNi-Cr3C2Powder, 200g of coated Ni-MoS2Mixing the powder and 250gNi powder in a planetary ball mill, wherein the ball-material ratio is 3:1, the rotating speed of the planetary ball mill is 250r/min, and the ball milling time is 4h, thus obtaining the spray powder.
S2, workpiece pretreatment: and carrying out sand blowing treatment on the low-alloy high-strength steel after integral steam degreasing, wherein the sand blowing adopts corundum sand with the diameter of 0.5mm, the pressure is 0.5MPa, the distance is 180mm, and the sand blowing is carried out until the surface roughness reaches Ra3.8 mu m. And cleaning the surface of the high-strength steel by using acetone and industrial alcohol after sand blasting.
S3, spraying: the spraying distance is 280mm, the powder feeding speed is 35g/min, the oxygen pressure is 1.2Mpa, the oxygen flow is 350L/min, the propane pressure is 0.6Mpa, and the propane flow is 100L/min.
Example 4
The embodiment provides a supersonic flame spraying self-lubricating wear-resistant coating process, which comprises the following steps:
s1, preparing a spray powder: 700g of coated CrNi-Cr3C2Powder, 100g coated Ni-MoS2Mixing with 200gNi powder in a planetary ball mill at a ball-to-material ratio of 3:1, a planetary ball mill rotation speed of 250r/min and a ball milling time of 4h to obtain spray powder.
S2, workpiece pretreatment: and carrying out sand blowing treatment on the low-alloy high-strength steel after integral steam degreasing, wherein the sand blowing adopts corundum sand with the diameter of 0.5mm, the pressure is 0.5MPa, the distance is 180mm, and the sand blowing is carried out until the surface roughness reaches Ra3.8 mu m. And cleaning the surface of the high-strength steel by using acetone and industrial alcohol after sand blasting.
S3, spraying: the spraying distance is 250mm, the powder feeding speed is 30g/min, the oxygen pressure is 1.2Mpa, the oxygen flow is 400L/min, the propane pressure is 0.6Mpa, and the propane flow is 120L/min.
Comparative example 1
The embodiment provides a supersonic flame spraying self-lubricating wear-resistant coating process, which comprises the following steps:
s1, preparing a spray powder: 700g of coated CrNi-Cr3C2Mixing the powder and 287.5gNi powder in a planetary ball mill, and ball millingThe ratio is 3:1, the rotating speed of the planetary ball mill is 250r/min, and the ball milling time is 4h, so as to obtain the spraying powder.
S2, workpiece pretreatment: and carrying out sand blowing treatment on the low-alloy high-strength steel after integral steam degreasing, wherein the sand blowing adopts corundum sand with the diameter of 0.5mm, the pressure is 0.5MPa, the distance is 180mm, and the sand blowing is carried out until the surface roughness reaches Ra3.8 mu m. And cleaning the surface of the high-strength steel by using acetone and industrial alcohol after sand blasting.
S3, spraying: the spraying distance is 280mm, the powder feeding speed is 35g/min, the oxygen pressure is 1.2Mpa, the oxygen flow is 350L/min, the propane pressure is 0.6Mpa, and the propane flow is 100L/min.
Comparative example 2
The embodiment provides a supersonic flame spraying self-lubricating wear-resistant coating process, which comprises the following steps:
s1, preparing a spray powder: 700g of coated CrNi-Cr3C2Flour, 287.5gNi flour, and 112.5gMoS2Mixing the powder in a planetary ball mill at a ball-material ratio of 3:1, a planetary ball mill rotating speed of 250r/min and a ball milling time of 4h to obtain the spray powder.
S2, workpiece pretreatment: and carrying out sand blowing treatment on the low-alloy high-strength steel after integral steam degreasing, wherein the sand blowing adopts corundum sand with the diameter of 0.5mm, the pressure is 0.5MPa, the distance is 180mm, and the sand blowing is carried out until the surface roughness reaches Ra3.8 mu m. And cleaning the surface of the high-strength steel by using acetone and industrial alcohol after sand blasting.
S3, spraying: the spraying distance is 280mm, the powder feeding speed is 35g/min, the oxygen pressure is 1.2Mpa, the oxygen flow is 350L/min, the propane pressure is 0.6Mpa, and the propane flow is 100L/min.
Comparative example 3
The embodiment provides a supersonic flame spraying self-lubricating wear-resistant coating process, which comprises the following steps:
s1, preparing a spray powder: 600g of mixed CrNi-Cr3C2Powder, 150g coated Ni-MoS2Mixing the powder and 250gNi powder in a planetary ball mill, wherein the ball-material ratio is 3:1, the rotating speed of the planetary ball mill is 250r/min, and the ball milling time is 4h, thus obtaining the spray powder.
S2, workpiece pretreatment: and carrying out sand blowing treatment on the low-alloy high-strength steel after integral steam degreasing, wherein the sand blowing adopts corundum sand with the diameter of 0.5mm, the pressure is 0.5MPa, the distance is 180mm, and the sand blowing is carried out until the surface roughness reaches Ra3.8 mu m. And cleaning the surface of the high-strength steel by using acetone and industrial alcohol after sand blasting.
S3, spraying: the spraying distance is 280mm, the powder feeding speed is 35g/min, the oxygen pressure is 1.2Mpa, the oxygen flow is 350L/min, the propane pressure is 0.6Mpa, and the propane flow is 100L/min.
Comparative example 4
The embodiment provides a supersonic flame spraying self-lubricating wear-resistant coating process, which comprises the following steps:
s1, preparing a spray powder: 600g of coated CrNi-Cr3C2Powder, 150g coated Ni-MoS2Mixing in a planetary ball mill with a ball-material ratio of 3:1, a planetary ball mill rotating speed of 250r/min and ball milling time of 4h to obtain the spray powder.
S2, workpiece pretreatment: and carrying out sand blowing treatment on the low-alloy high-strength steel after integral steam degreasing, wherein the sand blowing adopts corundum sand with the diameter of 0.5mm, the pressure is 0.5MPa, the distance is 180mm, and the sand blowing is carried out until the surface roughness reaches Ra3.8 mu m. And cleaning the surface of the high-strength steel by using acetone and industrial alcohol after sand blasting.
S3, spraying: the spraying distance is 280mm, the powder feeding speed is 35g/min, the oxygen pressure is 1.2Mpa, the oxygen flow is 350L/min, the propane pressure is 0.6Mpa, and the propane flow is 100L/min.
TABLE 1 Process parameters of examples 1-4 and comparative examples 1-4
| Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | |
| CrNi-Cr3C2/g | 500 | 600 | 600 | 700 | 600 | 600 | 600 | 600 |
| CrNi-Cr3C2Type (B) | Coated type | Coated type | Coated type | Coated type | Coated type | Coated type | Hybrid type | Coated type |
| Ni/g | 400 | 250 | 250 | 100 | 287.5 | 287.5 | 250 | / |
| Ni-MoS2/g | 100 | 150 | 200 | 200 | / | / | 150 | 150 |
| MoS2/g | / | / | / | / | / | 112.5 | / | / |
| Spraying distance/mm | 300 | 280 | 280 | 250 | 280 | 280 | 280 | 280 |
| Powder feeding rate g/min | 40 | 35 | 35 | 30 | 35 | 35 | 35 | 35 |
| Oxygen flow L/min | 300 | 350 | 350 | 400 | 350 | 350 | 350 | 350 |
| Propane flow L/min | 80 | 100 | 100 | 120 | 100 | 100 | 100 | 100 |
Test examples
The coatings prepared in examples 1-4 and comparative examples 1-4 were tested by the following methods:
the microhardness of the coating was measured with a microhardness tester (MICROMET-6030, Buehler, America), load 2.94N, dwell time 15 s. To ensure the stability of the data, the microhardness values are the average of 5 measurement points.
The coating bond strength was tested according to GB/T8462-2002 "determination of tensile bond strength by thermal spraying".
The dry friction coefficients of the coatings in examples and comparative examples during sliding friction were analyzed by an abrasion tester. In the test, a diamond sheet is selected as a pair grinding pair, the pressure of the testing machine is 40N, the linear speed is 1m/s, the testing time is 300s, the friction travel is 300m, and the friction coefficient is directly read from the testing machine.
Table 2 test results of examples 1 to 4 and comparative examples 1 to 4
| Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | |
| microhardness/HV0.3 | 537 | 584 | 546 | 594 | 739 | 597 | 542 | 509 |
| Bonding strength/MPa | 73.2 | 60.3 | 56.4 | 52.8 | 74.5 | 45.6 | 47.9 | 35.4 |
| Coefficient of friction | 0.386 | 0.325 | 0.235 | 0.308 | 0.621 | 0.474 | 0.395 | 0.425 |
As can be seen from Table 2, MoS was added2Can effectively reduce the friction coefficient of the coating, and adopts coated Ni-MoS2Is beneficial to improving the microhardness and the bonding strength of the coating and more effectively reducing the friction coefficient. Adopts coated CrNi-Cr3C2The powder can effectively improve the microhardness and the bonding strength of the coating.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A supersonic flame spraying self-lubricating wear-resistant coating process is characterized by comprising the following steps:
CrNi-Cr3C2Powder, Ni powder and Ni-MoS2Uniformly mixing the powder to prepare spraying powder;
in the spray powder, the CrNi-Cr3C2The weight ratio of the powder is 50-70 percent, and the Ni-MoS2The weight ratio of the powder is 10 to 20 percent; the balance being Ni powder; the CrNi-Cr3C2Powder and Ni-MoS2The powder is coated powder;
preprocessing a workpiece to be sprayed;
and (4) spraying.
2. The process of claim 1, wherein the CrNi-Cr is present in the spray powder3C260-70% of powder by weight and Ni-MoS2The weight ratio of the powder is 10 to 20 percent; the balance being Ni powder.
3. The supersonic flame spray self-lubricating abradable coating process of claim 2, wherein the CrNi-Cr3C2Cr in powder3C225-50% of CrNi in weight ratio and the balance of CrNi; the Ni-MoS2Wherein the weight ratio of Ni is 25 percent, and the balance is MoS2。
4. The supersonic flame spraying self-lubricating wear-resistant coating process according to claims 1 to 3, wherein the CrNi-Cr3C2The particle size of the powder is 11-45 mu m, the particle size of the Ni powder is 10-50 mu m, and the Ni-MoS2The particle size of the powder is 48-75 μm.
5. The supersonic flame spray of claims 1-3The self-lubricating wear-resistant coating process is characterized in that the CrNi-Cr3C2Powder, Ni powder and Ni-MoS2The powder mixing mode is ball milling mixing, the rotating speed of the ball mill is 250-300 r/min, and the ball milling time is 4 hours.
6. The supersonic flame spraying self-lubricating wear-resistant coating process according to claims 1-3, wherein the spraying process parameters are as follows: the spraying distance is 250-300 mm, the powder feeding speed is 30-40 g/min, the oxygen pressure is 1.2Mpa, the oxygen flow is 200-300L/min, the propane pressure is 0.6Mpa, and the propane flow is 80-120L/min.
7. The supersonic flame spraying self-lubricating wear-resistant coating process according to claims 1-3, wherein the workpiece substrate material to be sprayed is low-alloy high-strength steel.
8. The supersonic flame spraying self-lubricating wear-resistant coating process according to claims 1-3, wherein the pretreatment of the workpiece to be sprayed comprises a sand blowing step on the surface of the workpiece, and the sand blowing step comprises the following process parameters: corundum sand with the diameter of 0.3-0.8 mm is adopted, and the sand blowing pressure is 0.4-0.5 MPa; and blowing sand until the roughness of the surface of the workpiece reaches Ra3.0-3.8 mu m.
9. A self-lubricating wear-resistant coating prepared by the process of any one of claims 1 to 3.
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| CN111074192A (en) * | 2019-12-10 | 2020-04-28 | 常州大学 | Ni bag MoS2Self-lubricating Cr3C2Preparation method of NiCr coating |
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