CN104233158A - Ni60A-WC nano-coating and preparation method thereof - Google Patents
Ni60A-WC nano-coating and preparation method thereof Download PDFInfo
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- CN104233158A CN104233158A CN201410462197.0A CN201410462197A CN104233158A CN 104233158 A CN104233158 A CN 104233158A CN 201410462197 A CN201410462197 A CN 201410462197A CN 104233158 A CN104233158 A CN 104233158A
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Abstract
The invention relates to a Ni60A-WC nano-coating and a preparation method thereof. The Ni60A-WC nano-coating contains the ingredients in percentage by mass: 3-15% of Ni60A, 68-83% of WC, 2% of CaF2 and 1.21% of trace elements, wherein the trace elements comprise Cr, Si, B and Fe. The preparation method comprises the following steps of firstly, preparing nano-spheres by adopting a temperature type crushing method, then, mixing Cr, Si, B and Fe by adopting an activating agent protection method, so as to prepare nano-powder, and then, forming the Ni60A-WC nano-coating on a 9Cr18 die steel base body by adopting a hypersonic flame spraying process. According to the Ni60A-WC nano-coating and the preparation method thereof, the problems that the existing tungsten carbide coating is relatively poor in wear resistance and relatively low in corrosion resistance are solved, and the microscopic tissue and structure of a coating layer of the surface of a material are improved, so that the wear resistance of the surface of the material is improved overall, and meanwhile, a remarkable effect on the improvement of comprehensive mechanical properties is achieved.
Description
Technical field
The present invention relates to technical field of hot, is a kind of Ni60A-WC nano coating and preparation method thereof specifically.
Background technology
As everyone knows, except minority precious metal, metallic substance can be corroded with surrounding medium generation chemical reaction and electrochemical reaction.In addition, metallic surface by various mechanical effect the wearing and tearing that cause also very serious.A large amount of hardwares lost efficacy because of corrosion and wearing and tearing, caused waste greatly and loss.Therefore, development protecting metallic surface and intensifying technology are the key subjects of various countries' general concern.
Hot-spraying techniques is a kind of surface strengthening technology, and it can repair the old and utilize scraps in maintenance of equipment, and the component scrapped " are come back to life ", also can carry out strengthening and pre-protection in product innovation manufacture, make it " prolong life ".
But it is high at present to there is coating porosity in this technology, the shortcomings such as strict are required to spraying particle size range, and range of application is narrower, power consumption large, people need that a kind of coating hardness is high, wear resistance good, have certain toughness, and the coated material of various workpieces surface spraying can be applicable to, be beneficial to development and the popularization of hot-spraying techniques.
Summary of the invention
For above-mentioned technical problem, the invention provides a kind of Ni60A-WC nano coating and preparation method thereof.
Technical problem to be solved by this invention realizes by the following technical solutions:
A kind of Ni60A-WC nano coating, the mass percent of its component and each component is that Ni60A accounts for 3%-15%, WC and accounts for 68%-83%, CaF
2account for 2%, trace element accounts for 1.21%; Described trace element comprises Cr, Si, B and Fe; Because Ni60A and WC material hardness is higher, poor toughness, with the addition of the auxiliary agent CaF of 2%
2the toughness 100% of material can be improved, material can be made to bend under 80 DEG C of about-180 DEG C Working environments and do not rupture.
The preparation method of Ni60A-WC nano coating comprises the following steps: first adopt warm formula comminuting method to obtain a nanometer ball, and then employing promoting agent protection method mixed C r, Si, B and Fe obtain nanometer powder.
Described each component can adopt hypersonic flame spraying technique to prepare Ni60A-WC nano coating on 9Cr18 die steel matrix.
The invention has the beneficial effects as follows: the invention solves the problem that existing tungsten carbide coating wear resistance is poor, erosion resistance is lower, improve the microtexture of material surface coating, structure, coating hardness is made to improve 50%, Young's modulus improves 8.5%-14.4%, thus the overall wear resisting property improving material surface, also there is significant effect to the comprehensive mechanical property improving improvement simultaneously; Described Ni60A-WC nano coating is applicable to multiple steel such as: 20Cr, 12CrNi3A, 5CrMnMo, 5CrNiMo, 4CrMnSiMoV, 5Cr2NiMoVSi etc., and hardness is strengthened to some extent compared with conventional alloys material, and toughness, bonding strength have very big raising.
Embodiment
The technique means realized to make the present invention and creation characteristic are easy to understand, and set forth further below to the present invention.
Embodiment one:
A kind of Ni60A-WC nano coating, the mass percent of its component and each component is that Ni60A accounts for 3%, WC accounts for 93.79%, CaF
2account for 2%, trace element accounts for 1.21%; Described trace element comprises Cr, Si, B and Fe; First adopt warm formula comminuting method to obtain the nanometer ball of Ni60A and WC, then employing promoting agent protection method mixed C r, Si, B and Fe obtain nanometer powder, adopt hypersonic flame spraying technique to prepare Ni60A-WC nano coating afterwards on 9Cr18 die steel matrix.
The workpiece of described Ni60A-WC nano coating and the performance comparison experimental result of 20Cr steel matrix are in table 1.
The friction and wear behavior experimental result of the workpiece of described Ni60A-WC nano coating and the friction and wear behavior experimental result of 20Cr steel matrix contrast in table 2.
Embodiment two:
A kind of Ni60A-WC nano coating, the mass percent of its component and each component is that Ni60A accounts for 28.79%, WC accounts for 68%, CaF
2account for 2%, trace element accounts for 1.21%; Described trace element comprises Cr, Si, B and Fe; First adopt warm formula comminuting method to obtain the nanometer ball of Ni60A and WC, then employing promoting agent protection method mixed C r, Si, B and Fe obtain nanometer powder, adopt hypersonic flame spraying technique to prepare Ni60A-WC nano coating afterwards on 9Cr18 die steel matrix.
The workpiece of described Ni60A-WC nano coating and the performance comparison experimental result of 20Cr steel matrix are in table 1.
The friction and wear behavior experimental result of the workpiece of described Ni60A-WC nano coating and the friction and wear behavior experimental result of 20Cr steel matrix contrast in table 3.
Embodiment three:
A kind of Ni60A-WC nano coating, the mass percent of its component and each component is that Ni60A accounts for 15%, WC accounts for 81.79%, CaF
2account for 2%, trace element accounts for 1.21%; Described trace element comprises Cr, Si, B and Fe; First adopt warm formula comminuting method to obtain the nanometer ball of Ni60A and WC, then employing promoting agent protection method mixed C r, Si, B and Fe obtain nanometer powder, adopt hypersonic flame spraying technique to prepare Ni60A-WC nano coating afterwards on 9Cr18 die steel matrix.
The workpiece of described Ni60A-WC nano coating and the performance comparison experimental result of 20Cr steel matrix are in table 1.
The friction and wear behavior experimental result of the workpiece of described Ni60A-WC nano coating and the friction and wear behavior experimental result of 20Cr steel matrix contrast in table 4.
Experiment proves, the hardness of Ni60A-WC coating can reach HRC71, and coat-thickness can reach 2 millimeters, and show that the density of the bonding strength of Ni60A-WC coating, tissue is better through test of many times, coating density can reach 14.28g/cm
3.
The workpiece of table 1 Ni60A-WC nano coating and the performance comparison experimental result of 20Cr steel matrix:
Can be obtained by experimental data, Ni60A-WC nano coating effectively can reduce the porosity of workpiece surface, improves the bonding strength of workpiece surface, can increase substantially the microhardness of workpiece surface.
The friction and wear behavior of the Ni60A-WC nano coating of table 2 embodiment one and the friction and wear behavior contrast and experiment of 20Cr steel matrix:
| Group | Before test (g) | After test (g) | Loss (mg) |
| Embodiment one | 68.7626 | 68.7617 | 0.9 |
| Control group | 71.9714 | 71.9561 | 15.3 |
The friction and wear behavior of the Ni60A-WC nano coating of table 3 embodiment two and the friction and wear behavior contrast and experiment of 20Cr steel matrix:
| Group | Before test (g) | After test (g) | Loss (mg) |
| Embodiment two | 76.3584 | 76.3568 | 1.6 |
| Control group | 69.8641 | 69.8495 | 14.6 |
The friction and wear behavior of the Ni60A-WC nano coating of table 4 embodiment three and the friction and wear behavior contrast and experiment of 20Cr steel matrix:
| Group | Before test (g) | After test (g) | Loss (mg) |
| Embodiment three | 67.2574 | 67.2562 | 1.2 |
| Control group | 74.3872 | 74.3709 | 16.3 |
From table 2, table 3 and table 4, Ni60A-WC nano coating significantly can reduce the Surface Wear amount of workpiece, ensure the lasting wear resistance of workpiece, significantly extend the work-ing life of workpiece, at identical conditions, the abrasion loss of 9Cr18 is about 13 times of Ni60A-WC coating, and this Ni-WC coating showing prepared by hypersonic flame spraying technique has the excellent properties that the traditional technologys such as excellent wear-resistant grain abradability, hardness, intensity, toughness, high temperature resistant and rub resistance do not have.
More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; the just principle of the present invention described in above-described embodiment and specification sheets; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (2)
1. a Ni60A-WC nano coating, is characterized in that: the mass percent of its component and each component is that Ni60A accounts for 3%-15%, WC and accounts for 68%-83%, CaF
2account for 2%, trace element accounts for 1.21%; Described trace element comprises Cr, Si, B and Fe.
2. the preparation method of a Ni60A-WC nano coating; it is characterized in that: comprise the following steps: first adopt warm formula comminuting method to obtain nanometer ball; then employing promoting agent protection method mixed C r, Si, B and Fe obtain nanometer powder, adopt hypersonic flame spraying technique to prepare Ni60A-WC nano coating afterwards on die steel matrix.
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Cited By (2)
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| CN104889597A (en) * | 2015-05-09 | 2015-09-09 | 芜湖鼎瀚再制造技术有限公司 | Co-Mn-Si-Fe nanometer welding layer for welding and preparation method |
| CN105986216A (en) * | 2015-02-10 | 2016-10-05 | 中国科学院宁波材料技术与工程研究所 | Nickel base anti-abrasion coating and preparation method and application thereof |
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| CN104889597A (en) * | 2015-05-09 | 2015-09-09 | 芜湖鼎瀚再制造技术有限公司 | Co-Mn-Si-Fe nanometer welding layer for welding and preparation method |
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Application publication date: 20141224 |