(广州有色金属研究院 粉末冶金研究所，广州510650)
摘 要: 采用粉末冶金工艺，利用传统元素反应烧结合成TiAl基金属间化合物多孔材料。研究机械球磨对制备TiAl基多孔材料的影响，并研究低温烧结和高温烧结两个不同阶段中Ti、Al原材料粉末配比和Al粉颗粒度对制备TiAl基多孔材料的影响。结果表明：随球磨时间延长，坯料的孔隙度降低，未球磨粉末的颗粒分散性较差，对于细粉容易造成组织不均匀。n(Ti):n(Al)=1:2的坯料低温烧结后，再进行高温烧结，反应更加完全。Al粉粒度在40μm左右时，低温烧结成形能获得所需的比较好的闭孔隙形态。
关键字: TiAl合金；多孔材料；机械球磨；烧结；孔隙率
（Department of Powder Metallurgy, Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, China）
Abstract:TiAl intermetallic porous material was prepared by powder metallurgy process. The influence of mechanical milling on the preparation of TiAl porous material was investigated. The effects of powder ratio of raw materials and Al powder particle size on the preparation of TiAl porous material by sintering at low temperature and high temperature were studied, respectively. The results show that porosity reduces with increasing the milling time, the powders dispersion property is worse without milling and fine powder is easy to cause non-uniform microstructure. The chemical reaction of sample with n(Ti):n(Al)=1:2 is more completely by segmented sintering. The Al powder with particle size of about 40 μm can form better close pore by sintering at low temperature.
Key words: TiAl alloy; porous material; mechanical milling; sintering; porosity
