Ti-47Al-2Cr-2Nb-xTiB_2合金与Al_2O_3陶瓷型壳界面反应的研究  

Interfacial Reaction Between Ti-47Al-2Cr-2Nb-xTiB_2 Alloys and Al_2O_3 Ceramic Molds

作　　者：陈玉勇[1] 牛红志[1] 田竞[1] 肖树龙[1] 陈艳飞[1] 赵而团[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2010年第3期197-200,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(50674037)

摘　　要：实验室条件下制备了Ti-47Al-2Cr-2Nb-xTiB2(x=0、0.6%、1.0%,体积分数)合金熔体与Al2O3陶瓷型壳的界面反应层。借助SEM、EDS、XRD以及显微硬度测量等手段,对3种TiAl基合金熔体与Al2O3陶瓷型壳的界面反应情况进行了分析和比较。结果表明,TiAl基合金中加入TiB2,能有效减少TiAl基合金熔体与Al2O3陶瓷型壳的界面反应。TiAl基合金与AlO陶瓷型壳间的界面反应是一种不均衡进行的扩散型化学反应,并建立了界面反应的宏观模型。Interfacial reactive layers between Ti-47Al-2Cr-2Nb-xTiB2 alloys and Al2O3 ceramic molds were fabricated.With the help of SEM(scanning electron microscope),EDS(energy dispersive spectrum),XRD(X-ray diffraction)and micro-hardness measurements,interfacial reactive behaviors between three kinds of TiAl based alloys and Al2O3 ceramic molds were analyzed comparatively.The results reveal that the interfacial reaction of TiAl alloy melt with Al2O3 ceramic molds can be effectively relieved by adding TiB2.The interfacial reactive mechanism was characterized by an imbalanced diffusive chemical reaction,and the corresponding reaction model is established.

关 键 词：TIAL基合金 TIB2 精密铸造 界面反应 

分 类 号：TG249.5[机械工程—精密仪器及机械]