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Preparation and Properties of HfB2-ZrSi2-SiC Composites Fabricated by Reactive Spark Plasma Sintering
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1.School of Materials Science and Engineering,Zhengzhou University;2.Zhengzhou University of Aeronautics

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    Abstract:

    ZrC, Si and C powders were used as the sintering aids to enhance the densification and the mechanical properties of HfB2, due to the in-situ reaction between ZrC-Si-C at sintering temperature. Dense HfB2-ZrSi2-SiC ceramic composites have been fabricated by reactive spark plasma sintering at 1600 ℃ for 10 min under a pressure of 40 MPa. With the amount of ZrC-Si-C increasing, the Vickers hardness, the flexural strength and fracture toughness of the sintered samples increased first, then decreased. HfB2-10wt.% ZrC-Si-C composites showed the the best comprehensive mechanical properties. The Vickers hardness, flexural strength and fracture toughness of HfB2-10wt.% ZrC-Si-C composites were 26.80±1.2 GPa, 504±40 MPa and 4.66±0.21 MPa.m1/2, respectively.

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[Shichen Ma, Xiaotong Zhao, Gang Shao, Hailong Wang, Hongliang Xu, Hongxia Lu, Bingbing Fan, Rui Zhang. Preparation and Properties of HfB2-ZrSi2-SiC Composites Fabricated by Reactive Spark Plasma Sintering[J]. Rare Metal Materials and Engineering,2020,49(2):550~554.]
DOI:10.12442/j. issn.1002-185X. QH20190029

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History
  • Received:March 15,2019
  • Revised:March 15,2019
  • Adopted:April 19,2019
  • Online: March 12,2020
  • Published: