CN117737728A - Coating with high wear resistance, preparation method and centrifugal pump prepared by same - Google Patents
Coating with high wear resistance, preparation method and centrifugal pump prepared by same Download PDFInfo
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- CN117737728A CN117737728A CN202311765634.1A CN202311765634A CN117737728A CN 117737728 A CN117737728 A CN 117737728A CN 202311765634 A CN202311765634 A CN 202311765634A CN 117737728 A CN117737728 A CN 117737728A
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- coating
- alloy
- powder
- centrifugal pump
- wear resistance
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- 238000000576 coating method Methods 0.000 title claims abstract description 37
- 239000011248 coating agent Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 36
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 33
- 239000000956 alloy Substances 0.000 claims abstract description 33
- 229910000531 Co alloy Inorganic materials 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 18
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 9
- 230000003628 erosive effect Effects 0.000 abstract description 9
- 229910001018 Cast iron Inorganic materials 0.000 abstract description 6
- 229910052804 chromium Inorganic materials 0.000 abstract description 6
- 239000011651 chromium Substances 0.000 abstract description 6
- 238000004663 powder metallurgy Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000009472 formulation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005121 nitriding Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000006061 abrasive grain Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
Abstract
The invention discloses a coating with high wear resistance, a preparation method and a centrifugal pump prepared by the coating, and belongs to the technical field of coating preparation. The coating comprises the following components in percentage by weight: 40-50% of Ni-based self-alloyed powder, 40-50% of cast tungsten carbide powder and WC 13 5-15% of Co alloy powder and the balance of YG alloy. The coating prepared by the invention can obviously improve the hardness and wear resistance of the pump body and the pump cover erosion part of the centrifugal pump, and the service life of the centrifugal pump can be prolonged to 4-6 times of that of the centrifugal pump prepared from conventional high-chromium cast iron even under the working condition that the erosion and abrasion of particles in conveying media such as powder metallurgy, mines and the like are serious.
Description
Technical Field
The invention belongs to the technical field of coating preparation, and particularly relates to a coating with high wear resistance, a preparation method and a centrifugal pump prepared by the coating.
Background
The centrifugal pump is operated by utilizing the rotation of the impeller to make the fluid medium generate centrifugal motion, and in a specific use condition, when the fluid medium contains particles with higher hardness, the particles with higher hardness can cause serious erosion and abrasion to the pump body of the centrifugal pump under the action of pressure and speed, so that the pump body is worn out, and leakage and failure are caused. In order to solve the problem of wear resistance of the centrifugal pump, the conventional scheme is manufactured by adopting high-chromium cast iron or adding other wear-resistant materials, but the wear resistance still needs to be further improved when the prior art scheme is used for working conditions of serious erosion and abrasion of particles in conveying media such as powder metallurgy, mines and the like.
The pump body and the pump cover of the centrifugal pump have relatively complex structures, and the wear-resistant protection on the inner surfaces of the pump body and the pump cover also needs to consider the factors such as hardness of materials, bonding strength, convenience in preparation process and the like. The wear-resistant technical scheme of the conventional centrifugal pump can be divided into the following steps: 1. nitriding the wear-resistant part of the centrifugal pump (for example, CN 109236661B); 2. carrying out spray coating treatment on the wear-resistant part of the centrifugal pump (for example, CN 110257754A); 3. a wear-resistant block is arranged between the impeller and the pump shell, and wear-resistant cement (for example, CN 209053793U) is arranged on the inner wall of the pump head shell; 4. a high molecular composite silicon carbide ceramic material lining (for example CN108204367 a) is added to the wear-resistant part of the centrifugal pump.
Although the above techniques can improve and protect the centrifugal pump to a certain extent, the following disadvantages still exist: for example, the hardness and the wear resistance of the 1 st nitriding scheme cannot meet the working condition of high erosive wear, the bonding force and the coating thickness (generally 0.3-0.5 mm) of the 2 nd thermal spraying hard alloy coating scheme cannot meet the working condition of high erosive wear, the running reliability of the 3 rd abrasion-resistant block and the wear-resistant cement scheme is not enough, and the protective layer is easy to fall off; the 4 th silicon carbide ceramic material lining scheme has complex structure, poor toughness and smelting cracking. It is therefore important how to design a coating that meets the operating conditions and has excellent wear resistance.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a coating with high wear resistance, a preparation method and a centrifugal pump prepared by the coating, and the wear resistance of a working part such as the centrifugal pump can be effectively improved.
In order to achieve the above purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
a coating with high wear resistance, comprising the following components in percentage by weight:
40-50% of Ni-based self-alloyed powder, 40-50% of cast tungsten carbide powder and WC 13 5-15% of Co alloy powder and the balance of YG alloy.
Further, the composition comprises the following components in percentage by weight:
45-50% of Ni-based self-fluxing alloy powder, 45-50% of cast tungsten carbide powder and WC 13 5-10% of Co alloy powder and the balance of YG alloy.
Further, 48 to 50 percent of Ni-based self-fluxing alloy powder, 48 to 50 percent of cast tungsten carbide powder and WC 13 5-8% of Co alloy powder and the balance of YG alloy.
Further, the Ni-based self-alloyed powder has a particle diameter of 60 to 200 mesh.
Further, the particle size of the cast tungsten carbide powder is 40-80 meshes.
Further, WC 13 The particle size of Co alloy powder is 100-325 meshes.
Further, the YG alloy has a particle size of 2 to 8mm, including at least one of YG6, YG8, YG9 and YG12.
Further, the YG alloy includes YG6 and YG12 in a mass ratio of 1:2-3.
The preparation process includes mixing the components homogeneously, sintering at 900-1050 deg.c for 15-30 min and curing to form the coating.
A high-wear-resistance centrifugal pump is characterized in that the coating with high wear resistance is fixed on the pump body and the inner cavity wall of the pump cover of the centrifugal pump.
The invention has the beneficial effects that:
YG alloy particles with better toughness and cast tungsten carbide with extremely high hardness and wear resistance are added in the formula, and meanwhile, WC with fine particles is added 13 Co breaks the alloy and effectively fills weak gaps between large-particle hard phases. Finally, the nickel-based self-fluxing alloy is used as a bonding phase, the large-particle YG alloy and the cast tungsten carbide are used as a large framework, and the small-particle WC is formed 13 Co crushingThe alloy has a microstructure structure of small abrasive particles, and the novel wear-resistant coating has extremely high strength, erosion resistance and wear resistance.
The coating prepared by the invention can obviously improve the hardness and wear resistance of the pump body and the pump cover erosion part of the centrifugal pump, and the service life of the centrifugal pump can be prolonged to 4-6 times of that of the centrifugal pump prepared by the conventional high-chromium cast iron even under the working condition that the erosion and wear of particles in conveying media such as powder metallurgy, mines and the like are serious.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
Example 1
A coating with high wear resistance, comprising the following components in percentage by weight:
45% of 100-mesh Ni-based self-fluxing alloy powder, 40% of 80-mesh cast tungsten carbide powder and 100-mesh WC 13 6% of Co alloy powder and the balance of 4mm YG alloy, wherein the YG alloy comprises YG6 and YG12 in a mass ratio of 1:2.
Example 2
A coating with high wear resistance, comprising the following components in percentage by weight:
50% of 60-mesh Ni-based self-alloyed powder, 50% of 80-mesh cast tungsten carbide powder and 200-mesh WC 13 5% of Co alloy powder and the balance of 2mm YG alloy, wherein the YG alloy comprises YG6 and YG12 in a mass ratio of 1:3.
Example 3
A coating with high wear resistance, comprising the following components in percentage by weight:
40% of 200 mesh Ni-based self-alloyed powder, 40% of 40 mesh cast tungsten carbide powder and 160 mesh WC 13 15% of Co alloy powder and the balance of 8mm YG alloyThe YG alloy includes YG6 and YG12 in a mass ratio of 1:2.
Comparative example 1
YG6 was absent from the formulation compared to example 1, and the remaining components were the same as in example 1.
Comparative example 2
In comparison with example 1, WC was absent from the formulation 13 Co alloy, the rest was the same as in example 1.
Comparative example 3
In comparison with example 1, the cobalt-based alloy was used to replace the nickel-based self-fluxing alloy in the formulation, with the remainder being the same as in example 1.
Comparative example 4
Compared with example 1, the cobalt-based alloy is adopted to replace the nickel-based self-fluxing alloy in the formula, and simultaneously, the VC-Co hard alloy is adopted to replace the WC in the formula 13 Co alloy, the rest was the same as in example 1.
Experimental example
The coatings obtained in example 1 and comparative examples 1 to 4 were used to prepare high abrasion resistance centrifugal pumps, in the following steps:
1. and manufacturing a sand mold cavity according to the size of the pump body and the pump cover of the centrifugal pump.
2. The components are evenly mixed according to the formula and sintered for 15-30 minutes at 900-1050 ℃ to ensure the solidification and the formation of the sintered body.
3. And fixing the sintered mixed material blocks on the inner walls of the sand mould cavities of the pump body and the pump cover, and heating the mould cavities.
4. And (3) deoxidizing the molten abrasion-resistant molten steel, and then pouring the molten abrasion-resistant molten steel into a cavity for integral casting.
5. Machining the relevant position meets the assembly requirement.
After the completion of the production, the abrasion loss was measured by using an abrasive grain abrasion tester, and the results are shown in Table 1 using a conventional high-chromium cast iron sample block as a control.
TABLE 1 wear level
According toThe data in Table 1 shows that the wear-resistant coating prepared by the technical scheme of the application has improved wear resistance by 3.15 times compared with the conventional high-chromium cast iron sample, and greatly improved wear resistance. Compared with comparative examples 1 and 2, due to the lack of partial components in the formula, the wear-resistant effect is incomplete compared with the technical scheme, and the wear resistance of the wear-resistant alloy is not obviously superior to that of the conventional high-chromium cast iron sample block, so that the wear-resistant alloy does not have excellent wear-resistant effect. In comparative examples 3 and 4, cobalt-based alloy, VC-Co cemented carbide was used to replace nickel-based self-fluxing alloy, WC 13 Co alloys, the resulting coatings have a certain wear resistance, but still have a 2-to 3-fold difference compared to the present application. Therefore, the coating with excellent wear-resistant effect can be prepared only by matching the components in the technical scheme, and the effect of prolonging the service life of the centrifugal pump by 4-6 times can be achieved.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (10)
1. A coating with high wear resistance, which is characterized by comprising the following components in percentage by weight:
40-50% of Ni-based self-alloyed powder, 40-50% of cast tungsten carbide powder and WC 13 5-15% of Co alloy powder and the balance of YG alloy.
2. The coating of claim 1, comprising the following components in weight percent:
45-50% of Ni-based self-fluxing alloy powder, 45-50% of cast tungsten carbide powder and WC 13 5-10% of Co alloy powder and the balance of YG alloy.
3. The coating according to claim 1 or 2, characterized by comprising the following components in weight percent:
48-50% of Ni-based self-fluxing alloy powder, 48-50% of cast tungsten carbide powder and WC 13 5-8% of Co alloy powder and the balance of YG alloy.
4. The coating according to claim 1 or 2, characterized in that the Ni-based self-alloyed powder has a particle size of 60-200 mesh.
5. The coating according to claim 1 or 2, wherein the cast tungsten carbide powder has a particle size of 40-80 mesh.
6. The coating according to claim 1 or 2, characterized in that WC 13 The particle size of Co alloy powder is 100-325 meshes.
7. The coating according to claim 1 or 2, wherein the YG alloy has a particle size of 2-8 mm, including at least one of YG6, YG8, YG9 and YG12.
8. The coating of claim 7, wherein the YG alloy comprises YG6 and YG12 in a mass ratio of 1:2-3.
9. A method for preparing the coating of any one of claims 1 to 8, characterized in that the components are uniformly mixed according to a formula and sintered for 15 to 30 minutes at 900 to 1050 ℃ for curing and forming.
10. A high wear resistance centrifugal pump, characterized in that the coating with high wear resistance according to any one of claims 1-8 is fixed on the pump body and the pump cover inner cavity wall of the centrifugal pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311765634.1A CN117737728A (en) | 2023-12-21 | 2023-12-21 | Coating with high wear resistance, preparation method and centrifugal pump prepared by same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311765634.1A CN117737728A (en) | 2023-12-21 | 2023-12-21 | Coating with high wear resistance, preparation method and centrifugal pump prepared by same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117737728A true CN117737728A (en) | 2024-03-22 |
Family
ID=90252320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311765634.1A Pending CN117737728A (en) | 2023-12-21 | 2023-12-21 | Coating with high wear resistance, preparation method and centrifugal pump prepared by same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117737728A (en) |
-
2023
- 2023-12-21 CN CN202311765634.1A patent/CN117737728A/en active Pending
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