原位热压制备Ti_3Si_(0.8)Al_(0.4)C_(1.95)固溶体陶瓷  

Fabrication of Ti_3Si_(0.8)Al_(0.4)C_(1.95) Solid Solution Ceramic through in-Situ Hot-Pressing

作　　者：丁艳[1] 翟洪祥[1] 李翠伟[1] 艾明星[1] 

机构地区：[1]北京交通大学材料工程中心,北京100044

出　　处：《稀有金属材料与工程》2007年第A01期244-246,共3页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(50472045);国家"863"项目(2003AA332080);北京交通大学博士生项目

摘　　要：以Ti、Si、Al和C(石墨)元素粉为原料,采用原位热压烧结法制备了高纯度的Ti3Si0.8Al0.4C1.95层间固溶体陶瓷块体材料,研究了合成温度对产物纯度的影响,测试分析了制备材料的相组成及显微结构,测试了制备材料的密度、抗弯强度及电阻率等特性。结果表明,适当的热压烧结温度为1550℃左右,偏高或偏低都导致TiC及Ti5Si3等杂相的生成;微观结构为典型的板状晶,晶粒内部的层状结构清晰可见;材料的密度、抗弯强度和电阻率均介于Ti3SiC2和Ti3AlC2两者之间。High purity Ti3Si0.8Al0.4C1.95 layered solid solution ceramic has been fabricated by in-situ hot-pressing from titanium, silicon, aluminum, and graphite elemental powders. The effect of the synthesis temperature to the purity of the product, the phase composition and the microstructure of the product were analyzed, and the density, flexural strength and resistivity were also analyzed. The result indicates that the appropriate temperature for hot-pressing is about 1550 ℃, but higher or lower temperature will lead to the appearance of the TiC and Ti5Si3; the grains have a typical platelike shape, and layered structure could be seen clearly from the SEM micrograph; the density, flexural strength and resistivity of the Ti3Si0.8Al0.4C1.95 are all between those of pure Ti3SiC2 and Ti3AlC2.

关 键 词：Ti3Si0.8Al0.4C1.95 热压 固溶体 材料性能 显微结构 

分 类 号：TQ174.1[化学工程—陶瓷工业]