Corrosion and wear properties of TB2 titanium alloy borided by pack boriding with La_(2)O_(3)  

La_(2)O_(3)包埋渗硼TB2钛合金的腐蚀与磨损性能

作　　者：De-yi QU Dan LIU Xin-yu WANG Yong-hua DUAN Ming-jun PENG 曲德艺;刘丹;王昕宇;段永华;彭明军(昆明理工大学材料科学与工程学院,昆明650093)

机构地区：[1]Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第3期868-881,共14页中国有色金属学报（英文版）

基　　金：the financial support from the National Natural Science Foundation of China (No. 51761023)。

摘　　要：To improve the surface performance of TB2 alloy,pack boriding was performed at 1100℃ for 20 h with 4 wt.%La_(2)O_(3).The composition and thickness of boride layer and corrosion and wear properties of borided TB2 alloy were measured.The results show that La_(2)O_(3) can promote the growth,continuity,and compactness of boride layer,and the length of TiB whisker increases from 16.80 to 21.84μm.The reason is that La_(2)O_(3) can react with B to form La−B active groups and further to improve the growth of the boride layer.The wear and corrosion resistances of TB2 alloy are enhanced by boriding with La_(2)O_(3).The wear mechanisms are adhesive wear and abrasive wear for unborided and borided TB2 alloys,respectively,and the corrosion mechanism is changed from local corrosion(unborided TB2 alloy)to uniform corrosion(borided TB2 alloy).为了改善TB2合金的表面性能,采用4%La_(2)O_(3)(质量分数)包埋渗硼法对TB2合金进行1100℃,20 h渗硼处理,研究TB2钛合金的渗硼层组成与厚度以及腐蚀与磨损性能。结果表明,La_(2)O_(3)在渗硼过程中促进硼化物层的生长,提高其连续性和致密性,TiB晶须长度从16.80增至21.84μm。这是因为La_(2)O_(3)能与B反应生成La−B活性基团,进一步促进硼化物层的生长。La_(2)O_(3)包埋渗硼能提高TB2合金的耐磨性和耐蚀性。未渗硼和渗硼TB2合金的磨损机制分别为粘着磨损和磨粒磨损,腐蚀机制从局部腐蚀(未渗硼TB2合金)转变为均匀腐蚀(渗硼TB2合金)。

关 键 词：TB2 alloy pack boriding wear properties corrosion performance 

分 类 号：TG174.4[金属学及工艺—金属表面处理]