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Effect of ultra-high temperature heat treatment on microstructures of W/ZrC cermets fabricated by different routes
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National University of Defense Technology,Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology,Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology,Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology

Clc Number:

TG146.411，TB331

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    Abstract:

    W/ZrC cermets were fabricated by Displacive Compensation of Porosity (DCP) and Hot Pressing (HP), and then they were heat treated at 2600°C for 1 h. Microstructure changes of W/ZrC cermets before and after heat treatment were investigated. Results showed that both of two W/ZrC cermets had an increase of open porosity, a linear expansion and a weight loss after the heat treatment. Annealed DCP-derived W/ZrC cermets were still composed of dispersive W phases and continuous ZrC phases, but residual WC, W2C and Zr-Cu alloy were gone, instead, a large increase of pores and a sharp reduction of W phases appearing. While a new phase of W2C was formed in annealed HP-derived W/ZrC cermets, and W grains had a tendency to congregate together to form a big agglomerate phase.

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[yuyiping, Wang Song, Li Wei, Jiang Jin Ming. Effect of ultra-high temperature heat treatment on microstructures of W/ZrC cermets fabricated by different routes[J]. Rare Metal Materials and Engineering,2017,46(1):63~67.]
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History
  • Received:October 13,2014
  • Revised:November 06,2014
  • Adopted:December 25,2014
  • Online: March 16,2017

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