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Effect of W Addition on Microstructure, Mechanical Properties, and Oxidation Behavior of ZrB2-SiC Composites
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Affiliation:

1.College of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China;2.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;3.Shandong Laboratory of Yantai Advanced Materials and Green Manufacture, Yantai 264006, China;4.Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering, Yantai 264006, China;5.Northwest Institute for Nonferrous Metal Research, Xi 'an 710016, China

Fund Project:

National Natural Science Foundation of China (51804251, 52104384); Science Fund of Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing (AMGM2021F04); Shandong Provincial Natural Science Foundation (ZR2021ME168, ZR2021JQ20); Planning Project of Xi'an Science and Technology (21XJZZ0041); LICP Cooperation Foundation for Young Scholars (HZJJ21-07); Taishan Scholars Program of Shandong Province; Youth Innovation Promotion Association (CAS 2021423); Key Research and Development Program of Shaanxi (2023-YBGY-343)

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    Abstract:

    The ZrB2-SiC composites with refractory metal W of different contents (1vol%, 3vol%, and 5vol%) were prepared by spark plasma sintering. The densification behavior of composites during sintering process was investigated. The influence of W additions on the microstructure evolution, phase composition, mechanical properties, and oxidation behavior of W-doped composites was studied. Results show that the W addition leads to the formation of core-shell structures in the composites, where the ZrB2 grains are considered as the core and the in-situ formed (Zr, W)B2 solid solution is considered as the shell, thereby effectively promoting the grain refinement and composite densification. Compared with those of the W-free composites, the Vickers hardness, flexural strength, and fracture toughness of W-doped composites are enhanced. The optimal mechanical properties can be achieved at W addition content of 3vol%: the highest hardness, strength, and toughness can be obtained for the composites. The mass gain and oxide scale thickness of composites are gradually decreased with increasing the W addition from 0vol% to 5vol%. When the W addition in composite is 5vol%, the SiC-depleted layer disappears. Finally, the influence mechanism of W addition on the performance of composites is discussed.

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[Gao Zhongtang, Lu Jiawei, Yu Yuan, Wang Yifei, Yu Defeng, Li Tongyang, Wang Lujie, Tang Huaguo, Qiao Zhuhui. Effect of W Addition on Microstructure, Mechanical Properties, and Oxidation Behavior of ZrB2-SiC Composites[J]. Rare Metal Materials and Engineering,2023,52(9):3003~3011.]
DOI:10.12442/j. issn.1002-185X.20220953

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History
  • Received:December 07,2022
  • Revised:March 16,2023
  • Adopted:March 17,2023
  • Online: September 22,2023
  • Published: September 21,2023