放电等离子烧结可加工Ti_2AlC陶瓷的研究  

Machinable Ti_2AlC Ceramics Produced by Spark Plasma Sintering

作　　者：郭俊明[1] 王宝森[1] 陈克新[2] 周和平[2] 

机构地区：[1]红河学院,云南蒙自661100 [2]清华大学,北京100084

出　　处：《稀有金属材料与工程》2007年第5期865-868,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50542005;90610011);云南省自然科学基金(2005C0078M)

摘　　要：以自蔓延高温合成(SHS)的Ti2AlC粉体为原料,利用放电等离子烧结技术(SPS)研究了Ti2AlC陶瓷的烧结制备。结果表明:烧结温度1250℃,压力20MPa,真空烧结,保温5min,可获得相对密度98.6%,维氏硬度为4.3GPa的致密烧结块体;烧结样品的维氏硬度随烧结温度升高而增大,但高于1250℃后随温度升高反而减小,SPS方法烧结Ti2AlC陶瓷的最佳温度为1250℃,当烧结温度≥1350℃时Ti2AlC分解;SEM分析表明,SPS技术烧结制备的Ti2AlC陶瓷片层尺寸随烧结温度的升高而增大。Ti2AlC machinable ceramics were prepared by spark plasma sintering （SPS） with the Ti2AlC powders made of SHS. The relative density is 98.6% and the Vickers hardness is 4.3 GPa for the sintered TiEAIC sample obtained at 1250℃ and 20 MPa for 5 min under vacuum. The Vickers hardness of sintered TiEAIC samples is enhanced with the increase of sintering temperature up to the optimal sintering temperature of 1250℃, then decreased and decomposed at≥ 1350℃. SEM showed that the layered grain size of the samples prepared by SPS increased with the increase of sintering temperature.

关 键 词：放电等离子烧结(SPS) TI2ALC TI3ALC2 可加工陶瓷 显微结构 

分 类 号：TF124.5[冶金工程—粉末冶金]