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以三元层状陶瓷材料Ti3AlC2与Al粉为原料进行无压真空烧结。通过改变烧结温度、保温时间及原料配比,研究了反应的过程及生成相。采用XRD、SEM分析了反应产物和界面。研究表明:Ti3AlC2与Al在923 K条件下保温120 min后有明显的新相生成,产物为Al3Ti、Al4C3;延长保温时间及升高温度有利于反应的发生,反应可用以下方程进行描述:Ti3AlC2+Al→Al3Ti+Al4C3;反应中Al元素向Ti3AlC2中扩散,在Ti3AlC2与Al之间形成了明显扩散层。
The ternary layered ceramic materials Ti3AlC2 and Al powder as raw materials were vacuum pressureless sintering. By changing the sintering temperature, holding time and raw material ratio, the reaction process and the formation phase were studied. The reaction products and interface were analyzed by XRD and SEM. The results show that Ti3AlC2 and Al have obvious new phases after being incubated at 923 K for 120 min, and the products are Al3Ti and Al4C3. Prolonging holding time and increasing temperature are beneficial to the reaction. The reaction can be described by the following equation: Ti3AlC2 + Al → Al3Ti + Al4C3. In the reaction, Al diffused into Ti3AlC2 and formed a distinct diffusion layer between Ti3AlC2 and Al.