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Journal of Materials Engineering and Performance

, Volume 27, Issue 4, pp 1866–1875 | Cite as

Microstructure and Mechanical Properties of W-ZrC Composites Synthesized by Reactive Melt Infiltration of Zr2Cu into Porous Preforms from Partially Carburized W Powders

  • Dong Wang
  • Yu-Jin Wang
  • Si-Jia Huo
  • Yan-Wei Zhao
  • Jia-Hu Ouyang
  • Gui-Ming Song
  • Yu Zhou
Article
  • 102 Downloads

Abstract

W-ZrC composites with different W contents from 48 to 73 vol.% have been synthesized by reactive melt infiltration of Zr2Cu melt into porous preforms from partially carburized W powders at 1300 °C for 1 h in vacuum. The influences of carbon content and porosity in the preforms on microstructure and mechanical properties of W-ZrC composites are investigated. Cold isostatic pressing followed by pre-sintering process is used to produce porous preforms with suitable porosities of 53.6-47% under a pressure of 100 MPa to allow sufficient penetration of Zr2Cu melt into the preforms. Small amounts of Cu-rich phases form in the synthesized W-ZrC composites after a complete reaction of y/2xZr2Cu(l) + WC y (s) = y/xZrC x (s) + W(s) + y/2xCu(l). These Cu-rich phases are distributed not only at the phase boundaries of W matrix and ZrC grains, but also in the interior of ZrC x grains. With decreasing W content from 73 to 48 vol.% in the W-ZrC composites, the flexural strength and fracture toughness increase from 519 to 657 MPa and from 9.1 to 10.6 MPa m1/2, respectively.

Keywords

mechanical properties microstructure partially carburized W powders reactive melt infiltration W-ZrC composite 

Notes

Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 51621091, 51172052 and 51472060) and Program for New Century Excellent Talents in University (No. NCET-13-0177).

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Copyright information

© ASM International 2018

Authors and Affiliations

  • Dong Wang
    • 1
  • Yu-Jin Wang
    • 1
  • Si-Jia Huo
    • 1
  • Yan-Wei Zhao
    • 2
  • Jia-Hu Ouyang
    • 1
  • Gui-Ming Song
    • 1
  • Yu Zhou
    • 1
  1. 1.Institute for Advanced Ceramics, School of Materials Science and EngineeringHarbin Institute of TechnologyHarbinChina
  2. 2.Science and Technology on Advanced Functional Composites LaboratoryAerospace Research Institute of Materials and Processing TechnologyBeijingChina

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