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Microstructure and properties of W–ZrC composites prepared by the displacive compensation of porosity (DCP) method

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
509
Issue
33
Identifiers
DOI: 10.1016/j.jallcom.2011.05.105
Keywords
  • W–Zrc Composites
  • Displacive Compensation Of Porosity (Dcp)
  • Microstructure
  • Mechanical Property
  • Ablation Resistance

Abstract

Abstract Tungsten–zirconium carbide composites were fabricated at different temperatures by the displacive compensation of porosity (DCP) method, the microstructure, mechanical properties, and ablation resistance were investigated. It was found that no WC phase was left in the composites prepared at 1400 °C, and a few residual W 2C particles were surrounded in W product. Microstructure analyses revealed that zirconium atoms diffused into tungsten carbide to form ZrC and W 2Zr besides carbon diffused into the Zr 2Cu melt. Composites fabricated at 1400 °C had a flexural strength of 356.7 ± 15.2 MPa, an elastic modulus of 193.7 ± 9.8 GPa, a fracture toughness of 7.0 ± 0.7 MPa m 1/2, and a hardness of 13.6 ± 0.7 GPa. After ablated by an oxyacetylene flame for 30 s, the higher temperature prepared composites had a better ablation resistance, the linear ablation rate was 0.0033 ± 0.0004 mm/s, and the mass ablation rate was 0.0012 ± 0.0001 g/s.

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