CaH_2还原TiO_2制备TiAl合金粉的研究  

RESEARCH OF PRODUCING TiAl ALLOY POWDER WITH CaH_2 REDUCTION TiO_2

作　　者：成永君[1] 郭广思[1] 胡小媚[1] 

机构地区：[1]沈阳理工大学材料学院,辽宁沈阳110168

出　　处：《粉末冶金工业》2006年第6期6-9,共4页Powder Metallurgy Industry

摘　　要：在1112～1600K温度范围内，以TiO2粉、CaH2粉和Al粉为原料，采用还原扩散法制备TiAl合金粉。该法是一种低成本高效率的绿色冶金方法。通过分析Ca-TiO2-Al体系可能发生的反应，计算这些反应的吉布斯自由能和体系的Ca蒸气压，以及对原料配比的控制。从热力学角度上证实了采用还原扩散法制备TiAl合金粉是可能的。在1423K条件下，针对保温时间进行了一系列实验。并对保温8h的实验产物进行XRD分析，证实为TiAl合金粉。In the temperature range from 1 112 K to 1 600 K, the TiAl alloy powder can be obtained by the Reduction - Diffusion Method using TiO2 powder, CaH2 powder and the Al powder as raw materials.And this method is a green metallurgy method of low cost and high efficiency. Considering the possible reactions in Ca-TiO2-Al system, according to calculated Gibbs free energy and vapor pressure of Ca, and controlling the proper reactant proportioning the thermody- namical feasibility of obtaining TiAl alloy powder by reduction - diffusion method was identified.A series of experiments were performed at 1 423 K for different holding time.By XRD, the product obtained by holding for 8 h was confirmed to be the TiAl alloy powder.

关 键 词：Ca—TiO2-Al体系 TiAl合金粉 热力学 

分 类 号：TB383.3[一般工业技术—材料科学与工程]