摘要
使用Al—Si合金熔体对钛铝基合金进行表面渗硅处理,在表层发生了不同程度的界面反应,生成成分比例不同的以Si,Ti,Al三元素为主的物相.表面渗硅处理可明显增强钛铝基合金的高温抗氧化性.经1173 K,100 h的恒温氧化后,表面涂层氧化生成致密的Si—Ti—Al—O复杂氧化物,而且表面涂层与TiAl基体之间还发生了一定程度的界面反应,生成Ti—Si及TiAl2化合物.对于1053 K渗硅处理的试样,在恒温氧化过程中,表面Si-Ti-Al化合物的局部区域已经转化成为更加稳定的Ti—Si化合物.
Siliconizing treatment on TiAl-based alloy was conducted by Al-Si molten alloy. The interfacial reactions have occured between the TiAl-based alloy and the Al-Si molten alloy, resulted in the formation of phases mainly composed of elements of Si, Ti and Al. After isothermal oxidation at 1173 K for 100 h, these Si-Ti-Al phases are transformed into compacted oxides of Si-Ti-Al-O. Moreover, interfacial reactions forming compounds of Ti-Si and TiAl2. The high-temperature oxidation resistance of the TiAl-based alloy is greatly improved by the siliconizing treatment. For the sample siliconized at 1153 K, part of the Si-Ti-Al compound directly transformed into Ti-Si compound during the isothermal oxidation.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第1期66-70,共5页
Acta Metallurgica Sinica
基金
航空基础科学基金99H21013资助项目
