原位合成含有Al_2O_3晶须Al_2O_3/Ti-Al复合材料机理的研究  

Mechanism of Synthesizing Al_2O_3/Ti-Al Composites with Al_2O_3 Whiskers by In-situ Process

作　　者：吕臣敬[1] 田秀淑[1] 韩玉芳[1] 

机构地区：[1]石家庄铁道大学材料科学与工程学院,石家庄050043

出　　处：《材料工程》2010年第12期30-34,共5页Journal of Materials Engineering

摘　　要：利用氧对金属Ti,Al粉的部分氧化,原位合成含Al2O3晶须的Al2O3/Ti-Al复合材料,利用XRD,EDAX和NO-RAN能谱仪对材料的晶相组成和元素成分进行分析,利用SEM观察材料显微组织和断口形貌。结果表明,反应步骤为:Ti,Al金属粉表面氧化→铝的熔化→TiAl3的生成→Ti2Al,TiAl,Ti3Al等多种化合物生成和Al对TiO2的还原反应;铝含量决定了材料的晶相组成,铝不足时,生成Ti2Al,TiAl,Ti3Al等多种金属间化合物和氧化铝,铝含量足够时,最终的产物为TiAl3,金属铝以及氧化铝等相;氧化铝晶须是通过VLS机理生成的,产物中晶须的数量和发达程度随铝含量的增加而递增,晶须的直径随热处理温度升高而增加。In-situ composite of Al2O3/Ti-Al with Al2O3 whiskers were prepared by partial oxidation of oxygen to Ti powder and Al power,crystal phase composition and elemental composition were analyzed by XRD,EDAX and NORAN.The results indicate that,the process of the reaction is as follows： surface of Ti and Al being oxidized→melting of Al→form of TiAl3→form of other Ti-Al intermellics and deoxidized of TiO2 by Al;the crystal composition is determined by aluminum content,when the content is enough,TiAl3,Al and Al2O3 will be gain,on the contrary,Ti2Al,TiAl,Ti3Al and Al2O3 will be gain;Al2O3 whiskers are synthesized via VLS process,the quantity of Al2O3 whiskers increase with the Al content,the whisker＇s diameter is improved with increasing of sintering temperature.

关 键 词：原位合成 晶须 Al2O3/Ti-Al 复合材料 机理 

分 类 号：TQ133.1[化学工程—无机化工]