TiH_2发泡制备TiAl基多孔材料及其组织性能研究

Research on structure property of TiAl-based Porous Material prepared by Titanium Hydride Foaming

通过在Ti、Al粉末中使用少量TiH2发泡剂替代纯Ti粉,制备具有高孔隙率特征的TiAl基多孔材料。探索适合的粉末复合方法,研究不同含量TiH2、不同Ti、Al粉末成分配比以及烧结工艺对材料孔隙率的影响。结果表明：n（Ti）∶n（Al）=1∶2,TiH2质量比为5%,真空反应烧结温度620℃、保温时间4 h条件下材料的孔隙率最大,可达到63.5%。材料的孔隙率随TiH2含量的增多、Al含量的增多先增大后逐渐减小,随烧结温度的升高逐渐减小,且多为连通型孔隙。烧结后多孔材料热导率为2～14 W·（m·K）-1。不同TiH2含量TiAl基金属间化合物抗压强度在6～40 MPa之间。

The preparation of TiAl-based porous material with high porosity by using little TiH2foaming agent instead of pure Ti powder was investigated. Powder composite method was analyzed. The effect of TiH2content,Ti/Al powder composition and sintering process on the material porosity were studied. The results show that when n（ Ti） ∶ n（ Al） =1∶ 2,TiH2mass fraction of 5%,the vacuum reaction sintering temperature of 620 ℃,holding time of 4 h, material porosity can reach 63. 5%. The material porosity increases first,then decreases with increasing the TiH2and Al powder. The material porosity decreases with increasing the sintering temperature. And most of the porosity is connected with each other.