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李鹏飞,范景莲,韩勇,章曼,田家敏.W-ZrC材料的强韧化机理和界面结合的研究[J].稀有金属材料与工程(英文),2019,48(3):751~757.[Peng-fei Li,Jing-lian Fan,Yong Han,Man Zhang and Jia-min Tian.Toughening Mechanisms and Interfacial Bonding of W-ZrC Composites[J].Rare Metal Materials and Engineering,2019,48(3):751~757.]
Toughening Mechanisms and Interfacial Bonding of W-ZrC Composites
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Received:March 16, 2018  Revised:April 10, 2018
Key words: Tungsten  ZrC particles  toughening mechanisms  rounding phenomenon  interfacial bonding
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Peng-fei Li,Jing-lian Fan,Yong Han,Man Zhang and Jia-min Tian  
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      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.