Al_3Ti颗粒增强镁基复合材料的反应烧结  

Reaction sintering of Al_3Ti particulate reinforced Mg matrix composite

作　　者：杨子润[1] 王树奇[1] 鞠新庆[1] 陈康敏[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《粉末冶金技术》2009年第6期451-454,460,共5页Powder Metallurgy Technology

基　　金：江苏省高校自然科学指导性计划项目(06KJD430039);江苏大学创新团队启动基金资助项目(326)

摘　　要：采用Mg-Al—Ti反应体系，反应烧结制备了Al3Ti颗粒增强镁基复合材料，研究了烧结工艺对Al3Ti／Mg复合材料的组织和密度的影响。研究结果表明：采用镁、铝和钛粉反应烧结可以获得致密的Al3Ti／Mg复合材料，Al3Ti为原位形成，呈直径为0．5～5μm颗粒状较均匀地分布在镁基体中。烧结工艺（温度和保温时间）对Al3Ti／Mg复合材料的组织和密度有着明显的影响，随着温度升高和保温时间延长，原位反应越完全，有利于Al3Ti颗粒的分散，但过高温度和保温时间的延长，将造成颗粒的再团聚和镁的烧损。Al3Ti／Mg复合材料较佳的烧结工艺参数为：温度750～800℃，保温时间90～120min。A titanium tri-aluminide （Al3Ti） particulate reinforced Mg matrix composite has been fabricated through the reaction sintering of Mg-Al-Ti system. The mierostructure and relative density of Al3Ti/Mg composite under the different sintering processes was investigated by using XRD and SEM. The results show that the high dense Al3Ti/Mg composite is made through the reaction sintering of Mg, Al and Ti powders. Al3Ti particulates are in situ formed with size of 0.5 - 5μm and relatively homogeneously distribute in the matrix. It is found that there are significant effects of sintering processes （the temperature and holding time） on the microstructure and relative density of the composite. With the temperature and holding time increasing, in situ reaction is readily completed and Al3Ti particulates dispersed. However, excessively high temperature and long time lead to agglomeration of A13Ti particulates and volatile loss of Mg. The optimum sintering process is sintering at 750- 800℃ for 90- 120min.

关 键 词：复合材料 镁 反应烧结 显微组织 

分 类 号：TQ174.758[化学工程—陶瓷工业] TB331[化学工程—硅酸盐工业]