Ceramic Conversion Treatment of Titanium Aluminide for Improved Tribological Properties  

作　　者：JingXIA ChenxiLI HanshanDONG TomBELL 

机构地区：[1]Ad.Surf.Eng.Ltd,BirminghamResearchPark,BirminghamB152SQ,UK [2]DeptofMetallurgyandMaterials,TheUniversityofBirmingham,BirminghamB152TT,UK [3]Ad.Surf.Eng.Ltd,BirminghamResearchPark,BirminghamB152SQ,UK／／DeptofMetallurgyandMaterials,TheUniversityofBirmingham,BirminghamB1527T,UK

出　　处：《材料热处理学报》2004年第05B期1056-1059,共4页Transactions of Materials and Heat Treatment

摘　　要：Gamma-based titanium aluminides have great potential in the automotive industries (e.g. valves in a car engine), but tribological property could be one of the crucial factors in determining the life and performance of a titanium aluminide part. A surface modification technique, namely ceramic conversion (CC) treatment has been developed to improve the tribological properties of a y-based titanium aluminide (Ti-48AI-2Nb-2Cr-B), and the surface properties were fully characterised. The results indicate that ceramic conversion treatment can produce an oxide layer consisting of a top TiO2 surface followed by a mixture of TiO2 and A12O3. Such hardened layer has significantly improved the load-bearing capacity and wear resistance of the intermetallics, as evidenced by an increase of scuffing load up to 4 times and a wear rate reduction of two orders of magnitude. The coefficient of friction has also been reduced from 0.5-0.7 for the untreated to an average of 0.22 for the CC-treated alloy under dry sliding contact conditions.Gamma-based titanium aluminides have great potential in the automotive industries (e.g. valves in a car engine), but tribological property could be one of the crucial factors in determining the life and performance of a titanium aluminide part. A surface modification technique, namely ceramic conversion (CC) treatment has been developed to improve the tribological properties of a y-based titanium aluminide (Ti-48AI-2Nb-2Cr-B), and the surface properties were fully characterised. The results indicate that ceramic conversion treatment can produce an oxide layer consisting of a top TiO2 surface followed by a mixture of TiO2 and A12O3. Such hardened layer has significantly improved the load-bearing capacity and wear resistance of the intermetallics, as evidenced by an increase of scuffing load up to 4 times and a wear rate reduction of two orders of magnitude. The coefficient of friction has also been reduced from 0.5-0.7 for the untreated to an average of 0.22 for the CC-treated alloy under dry sliding contact conditions.

关 键 词：铝化钛 磨损性能 滑动磨损 毫微刻痕 陶瓷转换处理 

分 类 号：TG166.3[金属学及工艺—热处理]