Ti-Al系金属间化合物多孔材料的制备和性能  

Preparation and characteristics of Ti-Al based alloy porous material

作　　者：黄虎军[1] 贺跃辉[1] 江垚[1] 黄伯云[1] 徐南平[2] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]南京工业大学膜科学技术研究所,南京210009

出　　处：《材料研究学报》2007年第4期337-342,共6页Chinese Journal of Materials Research

基　　金：国家自然科学基金20476106资助项目.~~

摘　　要：使用粉末冶金模压成形和无压反应烧结方法,制备出Ti-Al系金属间化合物多孔材料,研究了铝含量对其孔隙形成机理以及孔结构性能的影响.结果表明:烧结后Ti-Al合金坯块发生了显著的体积膨胀;最大孔径和开孔隙率都随着铝含量的增加而增大,当铝含量(质量分数)超过60%时,总孔隙率出现下降趋势;Kirkendall效应导致的钛铝元素偏扩散反应是体积膨胀和孔隙形成的主要原因.Ti-Al based alloy porous materials were fabricated through cold pressing and pressureless sintering of Ti/Al elemental powder mixtures. The influence of AI content on the swelling behavior, pore structure properties and pore formation mechanism were investigated in detail. The results show that swelling effect and pore formation take place because of the different diffusivities of Ti and AI during reaction sintering. The swelling and porosity increase with increasing of the AI content, but when the AI content（mass fraction）exceeds 60 %, the swelling begins to suppress and the porosity begins to decrease. The prime reason for the pore formation is considered to be the existence of the porosity in green compacts and Kirkendall effect in the process of reactive synthesis.

关 键 词：金属材料 Ti-Al金属问化合物 多孔材料 Kirkendall效应 膨胀行为 

分 类 号：TG146[一般工业技术—材料科学与工程]