无压熔渗法制备TiC/Ni_3Al复合材料的渗入工艺研究  

Manufacturing TiC/Ni_3Al Composites by Using Pressureless Melt Infiltration Processing

作　　者：何柏林[1] 于影霞[1] 刘璠[1] 

机构地区：[1]华东交通大学机电工程学院,江西南昌330013

出　　处：《铸造技术》2009年第6期748-751,共4页Foundry Technology

基　　金：江西省自然科学基金资助项目(550015)

摘　　要：以化学纯镍粉、钛粉、铝粉、石墨粉为原料,采用燃烧合成方法制备了TiC/Ni3Al含孔预制件,用无压熔渗法制备了Ni3Al熔渗TiC/Ni3Al复合材料,研究了渗透温度和时间对TiC/Ni3Al复合材料的微观组织、硬度的影响,对无压渗透动力学进行了探讨。采用XRD和SEM分析了复合材料的相组成和微观结构。试验结果表明,无压熔渗法是制备致密的TiC/Ni3Al复合材料的有效方法,适当提高渗透温度,可大大缩短渗透时间。在完成渗透获得致密组织的前提下,渗透温度和渗透时间对TiC/Ni3Al复合材料的硬度无显著影响。渗透后复合材料的组成相为Ni3Al和TiC,颗粒结合良好。制备的Ni3Al/TiC复合材料的维氏硬度随TiC体积分数的增加而提高。Porous TiC-Ni3Al was synthesized by Self-propagating High-temperature Synthesis （SHS） method by using nickel, titanium, aluminum and graphite powder of chemical pure. Pressureless melt infiltration was used for preparing TiC/Ni3Al composites. Effects of the infiltration temperature and time on the microstructure, hardness of the composites were studied. XRD and SEM were used to analyze the phase identification and the microstructure. The kinetics of Pressureless melt infiltration was discussed. The results show that pressureless melt infiltration is an effective method to fabricate dense TiC/Ni3Al composites. The infiltration time can be greatly decreased when the infiltration temperature suitably increases. The infiltration temperature and time have no obvious effect of on the Vickers hardness of the composites. Ni3Al and TiC were well bonded, and they are the only two phases in the composites after infiltration. The Vickers hardness of TiC/Ni3Al composites was increased with increasing the amount of TiC.

关 键 词：无压熔渗 复合材料 微观组织 硬度 

分 类 号：TB331[一般工业技术—材料科学与工程]