超高温热处理对不同工艺制备的W/ZrC金属陶瓷微观结构的影响（英文）  

Effect of Ultra-high Temperature Heat Treatment on Microstructures of W/ZrC Cermets Fabricated by Different Routes

作　　者：余艺平 王松[1] 李伟[1] 蒋进明[1] 

机构地区：[1]国防科学技术大学新型陶瓷纤维及其复合材料重点实验室,湖南长沙410073

出　　处：《稀有金属材料与工程》2017年第1期63-67,共5页Rare Metal Materials and Engineering

基　　金：Foundation of Shanghai Aerospace Science and Technology;Aid Program for Innovative Group of National University of Defense Technology;Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province

摘　　要：分别采用置换填充工艺(DCP)和热压烧结工艺(HP)制备了W/Zr C金属陶瓷,然后在2600℃下对其进行热处理1 h。研究了热处理前后2种W/ZrC金属陶瓷的组织结构变化。研究表明,热处理后2种材料都出现开孔率增大、线膨胀及质量损失。其中DCP法W/Zr C金属陶瓷在热处理后仍由分散分布的W颗粒相和连续的Zr C相组成,但原始材料中残留的WC、W_2C及Zr-Cu合金相都消失,取而代之的是大量的孔隙,同时W相含量也急剧减小。而HP法W/Zr C金属陶瓷在热处理后则有新相W_2C生成,同时其W颗粒相有聚集的趋势,形成了大块团状相。W/Zr C cermets were fabricated by displacive compensation of porosity（DCP） and hot pressing（HP） separately, and then they were heat treated at 2600 oC for 1 h. Microstructure changes of W/Zr C cermets before and after heat treatment was investigated.Results show that both of two W/Zr C cermets have an increase in open porosity, a linear expansion and mass loss after the heat treatment. Annealed DCP-derived W/Zr C cermets are still composed of dispersive W phases and continuous Zr C phases, but residual WC, W_2 C and Zr-Cu alloy are gone; instead, a large increase of pores and a sharp reduction of W phases appear. While a new phase of W_2 C forms in annealed HP-derived W/Zr C cermets, W grains have a tendency to congregate together to form a big agglomerate phase.

关 键 词：钨/碳化锆金属陶瓷 微观结构变化 热处理 

分 类 号：TG148[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]