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Toughening Mechanisms and Interfacial Bonding of W-ZrC Composites
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China State Key Laboratory for Powder Metallurgy,Central South University

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TG146.4

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    Abstract:

    W-ZrC composites are promising materials for plasma face components. In this article, a process of “sol gel – heterogeneous precipitation –spray drying – hydrogen reduction – ordinary consolidation sintering” was used to prepare W-ZrC composites. The toughening mechanisms and interfacial bonding of W-ZrC composites were studied. ZrC particles could improve the strength and toughness of tungsten. The relative density and tensile strength of W-0.5wt.%ZrC are 99.2 % and 460 MPa sintering at 1920 °C. Preliminary transient high-heat flux test shows that W-ZrC composites can endure high-heat flux of 200 MW/m2(5 ms), and ZrC particles can consume the crack propagation energy and hinder crack propagation. ZrC particles had a process of growing up and rounding, and translated into nearly spherical particles sintering at 1600 °C held for 1 h. At the interfacial bonding zone of ZrC particles and tungsten, W, Zr, and C elements were smooth transition. The hardness of W,ZrC and interfacial bonging zone were 12 GPa, 22 GPa, and 18 GPa, respectively. The linear SEM-EDS and nanoindentation results indicate that the W and ZrC particles form (W,Zr)C compound.

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[Peng-fei Li, Jing-lian Fan, Yong Han, Man Zhang, Jia-min Tian. Toughening Mechanisms and Interfacial Bonding of W-ZrC Composites[J]. Rare Metal Materials and Engineering,2019,48(3):751~757.]
DOI:10.12442/j. issn.1002-185X.20180240

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History
  • Received:March 16,2018
  • Revised:April 10,2018
  • Adopted:April 26,2018
  • Online: April 10,2019
  • Published: