放电等离子烧结制备超细晶粒W-TiC复合材料  

Fabrication of Ultra Fine Grained W-TiC Composites by Spark Plasma Sintering

作　　者：谈军[1] 周张健[1] 屈丹丹[1] 马垚[1] 李明[1] 

机构地区：[1]北京科技大学,北京100083

出　　处：《稀有金属材料与工程》2011年第11期1990-1993,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金重点项目(50634060);国际热核聚变实验堆(ITER)计划专项国内配套项目(2010GB109000)

摘　　要：采用机械合金化和放电等离子烧结(SPS)技术制备了纳米TiC颗粒弥散增强超细晶W-TiC复合材料,对超细晶W-TiC复合材料的显微组织和室温力学性能进行了研究。研究表明,采用SPS工艺于1700℃下烧结1min可获得烧结颗粒结合良好,致密度高达约98.6%的超细晶W-TiC复合材料。通过添加纳米TiC,不仅能抑制W晶粒的长大,还能促进W的致密化。当TiC的加入量为0.7%时(质量分数,下同)可获得晶粒尺寸为0.5μm,抗弯强度和维氏硬度分别为1262MPa,6.45GPa的超细晶W-TiC复合材料。Nano TiC particles dispersion strengthened ultra fine grained（UFG） W-TiC composites were fabricated by mechanical alloying（MA） and spark plasma sintering（SPS）.The microstructure and the room temperature mechanical properties of the W-TiC composites were studied.The results show that the well-combined and highly-densified（nearly 98.6%） UFG W-TiC composites can be obtained by SPS at 1700 oC for 1 min.The addition of the nano TiC can refine the grains of W,and accelerate its densification.The grain size,relative density,bending strength and the Vicker hardness HV0.2 of the UFG W-TiC composites are 0.5 μm,98.6%,1262 MPa and 6.45 GPa,respectively when the content of TiC is 0.7wt%.

关 键 词：钨 超细晶粒 放电等离子烧结 TIC 

分 类 号：TB331[一般工业技术—材料科学与工程]