钛合金表面镍基喷焊涂层的组织和耐磨行为

采用火焰喷焊技术对钛合金表面进行耐磨改性,可以较好地解决实施工艺过程中的工程适应性问题,但对于任何一种表面耐磨处理技术,耐磨性能的改善和提高都是其最终目的。考察了钛合金表面上3种不同成分的镍基火焰喷焊涂层的组织和耐磨行为。研究发现,3种成分的镍基涂层都具有韧基体+硬质相的耐磨组织,其基体均为强韧性很好的镍基固溶体,但硬质相的差别较大。在相同试验条件下,100%的F102涂层、含4%La2O3的稀土复合涂层和含25%WC的N i-WC复合涂层的磨损失重仅为未处理钛合金的1/6,1/8和1/10。试验结果表明,采用火焰喷焊技术对钛合金表面进行耐磨处理,可以有效地改善表面的耐磨性。

Microstructure and Tribological Behavior of Ni-based Spray-welding Coating on Titanium Alloys Substrate

Improving wear resistance of titanium alloy by the flamed sprayed welding could resolve the problem of engineering adaptation in technical process better.However,the improvement of wear resistance is the ultimate aim to a surface technique using in wear resistance treatments.The microstructure and tribological behavior of three Ni-based sprayed welding coatings on titanium alloy substrate were investigated.The results show that three coatings all are characterized by a wear resistant microstructure composed by tough substrate and hard particles.Their substrates are Ni-based solid solution,but the buildup of hard particles is different obviously.The wear loss of the F102 coating,the RE compound coating including 4%La_2O_3 and the Ni-WC coating including 25%WC were apiece 1/6,1/8 and 1/10 of that titanium alloy.It is indicated that modifying wear resistance of titanium alloy by the flamed sprayed welding could improve effectively wear resistance of titanium alloy surface.