原位反应法制备TiC_x/Ni基复合材料及其压缩性能研究  

Preparation of TiC_x/Ni Matrix Composites by In-situ Reaction and Study on their Compressive Properties

作　　者：鲁益麟 翟洪祥 胡文强 黄振莺 

机构地区：[1]北京交通大学机械与电子控制工程学院材料科学与工程研究中心,北京100044

出　　处：《陶瓷学报》2017年第5期610-614,共5页Journal of Ceramics

基　　金：国家自然科学基金资助(M15A300020);中央高校基本科研业务费专项基金(M16JB00170)

摘　　要：为了制备出性能优异的TiC_x-Ni基复合材料,利用Ti_3AlC_2在Ar、1250℃下会发生分解反应生成超细TiC_x增强颗粒,同时Al原子会在高温下与Ni反应生成Ni3Al的原理,通过后挤压热压烧结工艺来制备TiC_x/Ni基复合材料。通过XRD、SEM、EDS以及压缩压缩实验发现,TiC_x/Ni基复合材料的性能与烧结温度和陶瓷相体积比有着较大的关系。其中随着温度的提高,复合材料的增强相大小以及TiC_x的x值会随之增大;随着陶瓷相含量的增加,复合材料微观结构中界面缺陷也相应的增加。结果表明,在Ti_3AlC_2预制体体积含量为40%,烧结温度为1400 oC条件下制备TiC_x/Ni基复合材料,其抗压性能和微观结构最为优异。TiC_x的x值为0.65、增强颗粒大小在亚微米级甚至纳米级,抗压强度为1.8 GPa,压缩变形率12%。In order to prepare TiC_x-Ni matrix composites with excellent properties, Ti_3AlC_2 was prepared by decomposition reaction of Ti_3AlC_2 at 1250 ℃, and the formation of ultrafine TiC_x reinforced particles and Al, and the reaction of Al with Ni to form Ni_3Al. The samples of TiC_x-Ni matrix composites were prepared by hot pressing sintering after adding extrusion. The samples were characterized by XRD, SEM, EDS and compressive properties. The results show that the properties of TiC_x/Ni-based composites have a great relation with the volume ratio of ceramic phase and the sintering temperature of the composites. With the increase of the content of ceramic phase, the interfacial defects in the microstructure of the composites increase correspondingly with the increase of the temperature and the size of the reinforced phase and the ‘x＇ value of TiC_x. The results show that TiC_x/Ni composites prepared with Ti_3AlC_2 preform at 40% sintering temperature and 1400 oC have better interfacial bonding. The lower ‘x＇ value of TiC_x is only 0.65, and the size of enhanced particles is in the submicron range even nanolevel, the compression performance of the most outstanding.

关 键 词：TiCx/Ni基复合材料 后挤压烧结工艺 TI3ALC2 制备 性能 

分 类 号：TQ174.75[化学工程—陶瓷工业]