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纳米ZrB2粉体放电等离子烧结制备ZrB2基超高温陶瓷的系统研究
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1.安徽工程大学;2.衢州学院

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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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    摘要:

    本文采用纳米ZrB2粉体系统研究了ZrB2基超高温陶瓷的放电等离子烧结行为。由于采用纳米粉体,单相ZrB2在1550℃的低温下即发生快速的致密化烧结。ZrB2-SiC陶瓷经1800℃放电等离子烧结后可实现完全致密化,并且材料的弯曲强度高达1078±162 MPa。在1700℃采用放电等离子烧结成功制备了ZrB2-SiC-Cf复合材料,材料断口表现出明显的纤维拔出现象,导致其具有高的断裂韧性值(6.04 MPa·m1/2)和非脆性断裂的模式。同时,ZrB2-SiC-Cf复合材料具有很高的临界热冲击温差(627℃),表明该材料具有优异的抗热冲击性能。

    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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桂凯旋,张庆达,朱冬冬,王刚.纳米ZrB2粉体放电等离子烧结制备ZrB2基超高温陶瓷的系统研究[J].稀有金属材料与工程,2020,49(7):2213~2219.[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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  • 收稿日期:2019-11-26
  • 最后修改日期:2020-05-25
  • 录用日期:2020-01-03
  • 在线发布日期: 2020-08-31
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