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李鹏飞,范景莲,韩勇,章曼,成会朝,田家敏.添加微量ZrC对钨材料组织演变和性能的影响[J].稀有金属材料与工程(英文),2018,47(6):1695~1699.[lipengfei,fanjinglian,hanyong,zhangman,chenghuichao and tianjiamin.Microstructure evolution and properties of tungstenreinforced by additions of ZrC[J].Rare Metal Materials and Engineering,2018,47(6):1695~1699.]
Microstructure evolution and properties of tungstenreinforced by additions of ZrC
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Received:October 17, 2016  Revised:January 10, 2017
DOI:
Key words: zirconium carbide  densification  microstructure evolution  grain refinement
Foundation item:国家科技攻关计划;国家教育部博士点基金
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lipengfei,fanjinglian,hanyong,zhangman,chenghuichao and tianjiamin  
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Abstract:
      In order to prepare high performance tungsten used as plasma face material, trace amount of ZrC was added to tungsten, and the densification behavior, properties and microstructure evolution of W-ZrC composites sintered at temperatures in the rang 1150 - 2000°C with flowing hydrogen atmosphere were investigated systematically. Results show that W-ZrC composite powders begin to form fine tungsten grains at 1300°C. The growth rate of grains is high at temperatures below 1600°C, and then slows down. The maximum relative density and tensile strength are 99.6% and 460MPa respectively under the optimum sintering process. ZrC particles are uniformly dispersed at grain boundaries and in grains interior with particle size from 0.1μm to 2 μm. Minor ZrC can effectively prevent the migration of grain boundaries and refine grain sizes from 100 μm of pure tungsten to 30 μm of W-ZrC composites. Minor ZrC can change the fracture mode and improve the strength and toughness of tungsten.