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A systematical investigation on the ZrB2-based ultra-high temperature ceramics fabricated by SPS using nanosized ZrB2 powders
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1.Anhui Polytechnic University;2.Quzhou University

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    Abstract:

    The spark plasma sintering behaviors of ZrB2-based ultra-high temperature ceramics were systematically investigated using nanosized ZrB2 powders. Rapid densification occurred at low temperature (1550 oC) for monolithic ZrB2 due to the nanosized powders. ZrB2-SiC ceramic achieved full densification at 1800 oC by SPS resulting in a high flexural strength of 1078±162 MPa. ZrB2-SiC-Cf composite was successfully prepared by SPS at 1700 oC. The composite showed obvious fiber pull-out on the fracture surface, leading to a high fracture toughness (6.04 MPa·m1/2) and a non-brittle fracture mode. Meanwhile, a high critical thermal shock temperature difference of 627 oC was obtained for ZrB2-SiC-Cf implying an excellent thermal shock resistance of such material.

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[Kaixuan Gui, Qingda Zhang, Dongdong Zhu, Gang Wang. A systematical investigation on the ZrB2-based ultra-high temperature ceramics fabricated by SPS using nanosized ZrB2 powders[J]. Rare Metal Materials and Engineering,2020,49(7):2213~2219.]
DOI:10.12442/j. issn.1002-185X.20190995

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History
  • Received:November 26,2019
  • Revised:May 25,2020
  • Adopted:January 03,2020
  • Online: August 31,2020
  • Published: