双辉离子TiAl基合金表面Cr-Si共渗及改善其耐磨性能的研究  

Cr-Si Alloyed by Double Glow Plasma on TiAl Based Alloy Surface and Wear Resistance Modification

作　　者：李亚非 张平则[1] 林凯[1] 于进文[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京211100

出　　处：《材料导报》2011年第4期90-93,106,共5页Materials Reports

基　　金：江苏省自然科学基金资助项目(BK2005128)

摘　　要：利用辉光离子渗金属技术，在TiAl基合金表面实现Cr-Si共渗。用SEM、EDS、XRD分别研究了由1号（880℃，2h，13mm）和2号（900℃，4h，18mm）工艺参数制备的合金层形貌、化学成分和相结构。结果表明，1号渗层厚度超过10μm，由外向内依次为Ti5Si3层、Al8Crs和α2-Ti3Al层、合金过渡层，且与基体呈冶金结合；与之相比，2号渗层厚度仅为5-7μm，表面为富Cr沉积层。摩擦磨损实验结果表明，1号和2号渗层室温耐磨性较基体分别提高7．3倍和4倍，高温（500℃）耐磨性提高26．5倍和17．3倍。Cr-Si was alloyed on TiAI based alloy surface by double glow plasma, and different layers were prepared following different parameters （ sample 1 ： 880℃, 2h, 13mm; sample 2 ： 900℃, 4h, 18mm）. The morphology, composition and phase structure were investigated. The result shows that the thickness of alloying layer of sample 1 reaches 10μm, composed of Ti,Si3 layer, intermetallic compound layer and transition layer, and there are metallurgical bonding among them. While the thickness of alloying layer of sample 2 is only 5- 7μm. Chromium deposition layer forms on the outer surface of alloy and the wear test result shows that the room temperature wear resistance of sample 1 and sample 2 increases by 7.3 and 4 times respectively compared with original TiAI alloy. High temperature wear resistance of sample 1 and sample 2 increases by 26.5 and 17.3 times respectively by contrast.

关 键 词：TIAL基合金 等离子渗金属 TI5SI3 耐磨性 

分 类 号：TB331[一般工业技术—材料科学与工程]