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納米ZrB2粉體放電等離子燒結(jié)制備ZrB2基超高溫陶瓷的系統(tǒng)研究
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1.安徽工程大學(xué);2.衢州學(xué)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:

    本文采用納米ZrB2粉體系統(tǒng)研究了ZrB2基超高溫陶瓷的放電等離子燒結(jié)行為。由于采用納米粉體，單相ZrB2在1550℃的低溫下即發(fā)生快速的致密化燒結(jié)。ZrB2-SiC陶瓷經(jīng)1800℃放電等離子燒結(jié)后可實(shí)現(xiàn)完全致密化，并且材料的彎曲強(qiáng)度高達(dá)1078±162 MPa。在1700℃采用放電等離子燒結(jié)成功制備了ZrB2-SiC-Cf復(fù)合材料，材料斷口表現(xiàn)出明顯的纖維拔出現(xiàn)象，導(dǎo)致其具有高的斷裂韌性值(6.04 MPa·m1/2)和非脆性斷裂的模式。同時(shí)，ZrB2-SiC-Cf復(fù)合材料具有很高的臨界熱沖擊溫差（627℃），表明該材料具有優(yōu)異的抗熱沖擊性能。

    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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桂凱旋,張慶達(dá),朱冬冬,王剛.納米ZrB2粉體放電等離子燒結(jié)制備ZrB2基超高溫陶瓷的系統(tǒng)研究[J].稀有金屬材料與工程,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
  • 錄用日期:2020-01-03
  • 在線發(fā)布日期: 2020-08-31
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