The composite coating was prepared by thermal spray welding after making composite powder, which is composed of Ni-based self-melted alloy and Al2O3 ceramic powder including nano, sub-micron and micron powders. The influences of contents and sizes of Al2O3 on the structure and wearability were investigated. The results show that the wear resistance of the coating would be increased greatly by adding Al2O3, but the spray weldability decreases with increasing Al2O3 content. So there is an optimal content of Al2O3 powder. The composite coating with Al2O3 nano or sub-micron powder of 0.5 % has the best abrasive resistance, while the optimal content of Al2O3 micron powder is 1%.
参考文献
| [1] | CAI Jian-ping;Li Bo .Thermal Spray Coating of Ceramics[J].Materials for Mechanical Engineering,2000,24(02):5-7. |
| [2] | 周广宏,丁红燕,陈志刚,陈彩凤.混粉工艺对纳米Al2O3复合涂层组织和性能的影响[J].新技术新工艺,2002(05):43-45. |
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