La2O3包埋渗硼TB2钛合金的腐蚀与磨损性能

为了改善TB2合金的表面性能,采用4％La2O3(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,La2O3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La2O3能与B反应生...

Corrosion and wear properties of TB2 titanium alloy borided by pack boriding with La2O3

To improve the surface performance of TB2 alloy, pack boriding was performed at 1100 °C for 20 h with 4 wt.% La₂O₃. The composition and thickness of boride layer and corrosion and wear properties of borided TB2 alloy were measured. The results show that La₂O₃ can promote the growth, continuity, and compactness of boride layer, and the length of TiB whisker increases from 16.80 to 21.84 μm. The reason is that La₂O₃ 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 La₂O₃. 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).