摘要
以Ti、Al、C、TiC粉末为原料,研究掺杂Si及Al含量对自蔓延高温合成Ti3AlC2的影响,合成材料的X射线衍射仪(XRD)及扫描电子显微镜(SEM)分析结果表明:物质的量比n(Ti):n(Al):n(C):n(TiC):n(Si)=2:1.2:1:0.9:0.1的原始混合粉末,经50 MPa压力压制的压坯在空气中自蔓延高温合成后,可获得高纯度的Ti3AlC2陶瓷材料,并且添加的Si均匀的固溶在基体中。合成的产物为片层状组织并存在极少的颗粒结构,片层状晶粒的平均尺寸为10μm左右。掺加硅时,适当增加Al含量有助于Ti3AlC2的生成。通过K-值法估算Ti3AlC2的纯度,在n(Ti):n(Al):n(C):n(TiC):n(Si)=2:1.2:1:0.9:0.1体系中,得到的Ti3AlC2陶瓷材料纯度高达97.75%。
Using Ti,Al,C,TiC powders as raw materials,the Ti3AlC2 cemmics material was prepared by self-propagating high-temperature synthesis doping with different content of Si and adjusting content of Al,and studied using X-ray diffraction and scanning electron microscopy.The results indicate that high purity of Ti3AlC2 was fabricated with n（Ti）：n（Al）：n（C）：n（TiC）：n（Si）=2：1.2：1：0.9：0.1 in molar ratio,which was pressed under a pressure of 50 MPa and synthesized in air atmosphere.The additive Si was uniformly distributed in the matrix.The synthetic product is in sheet shape and little grain structure,the average size of the plate sheet is about 10 μm.The proper addition of Si and the appropriate adjustment of Al are favorable to forming Ti3AlC2.Ti3AlC2 ceramics material with composition of n（Ti）：n（Al）：n（C）： n（TiC）：n（Si）=2：1.2：1：0.9：0.1,and a high purity of 97.75% has got.
出处
《粉末冶金材料科学与工程》
EI
2011年第5期736-741,共6页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(51161012)
甘肃省自然科学基金资助项目(1014RJZA0100)
