以Ti粉和Al粉为原料,并添加不同含量CuO粉体进行掺杂,经真空热压烧结制得了TiAl基复合材料.结合热分析,X射线衍射分析及扫描电镜分析对该体系的反应合成过程及CuO添加量对产物微结构的影响进行研究.结果表明:Al熔化后分别对Ti、CuO颗粒润湿并发生反应,热压反应温度在800 ℃时,生成了Al_3Ti中间产物.热压烧结温度达到1000℃时,合成了由TiAl,Al_2O_3,Al_(6.1)Cu_(1.2)Ti_(2.7)三种物相组成的复合材料.其基体主要由TiAl和Al_(6.1)Cu_(1.2)Ti_(2.7)两相组成,增强相Al_2O_3为Al-CuO置换反应生成,且其颗粒细小,主要分布在基体相周围.Al_(6.1)Cu_(1.2)Ti_(2.7)、Al_2O_3相含量随原料中CuO添加量不同而呈规律性变化.
Using Ti and Al powders doped with CuO powder as raw materials,Al_2O_3 partcle reinforced TiAl matrix composites were in-situ synthesized by vacuum hot-pressing. The reaction process and the effects of doping CuO on phases and microstructure of the composites were investigated by means of differential scanning calorimetry (DSC) ,X-ray diffraction (XRD) and scanning electron microscopy (SEM) . The results show that the aluminium powders are melted at first in sintering,and then Ti and CuO particles are wetted with melted aluminium and reacted each other. Intermediate Al_3Ti phase appears at 800 ℃ . The final composites,which consists of TiAl,Al_2O_3 and Al_(6.1)Cu_(1.2)Ti_(2.7),are synthesized successfully by hot pressing at 1000 ℃ . The matrix phase is composed of TiAl and Al_(6.1)Cu_(1.2)Ti_(2.7),and the reinforcement is Al_2O_3 generated by replacement reaction of Al and CuO. The fine Al_2O_3 particles are mainly distributed around the matrix. The phases of Al_(6.1)Cu_(1.2)Ti_(2.7) and Al_2O_3 are proportionally increased with the increase of CuO amount.
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