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熱壓燒結(jié)制備SiCw/ZrB2陶瓷復(fù)合材料的研究
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國(guó)家自然科學(xué)基金(50602010)


ZrB2 Matrix Ceramic Composites by Hot-Pressed and SiC Whisker Reinforced
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    摘要:

    在燒結(jié)溫度和壓力為1800 ℃和30 MPa條件下熱壓燒結(jié)制備ZrB2-20%(體積分?jǐn)?shù), 下同)SiCw陶瓷復(fù)合材料，并研究?jī)煞N不同SiC晶須對(duì)材料的顯微組織與力學(xué)性能的影響。結(jié)果表明，復(fù)合材料的彎曲強(qiáng)度和斷裂韌性與SiC晶須的長(zhǎng)徑比有關(guān)，長(zhǎng)徑比越大材料的性能越好，彎曲強(qiáng)度和斷裂韌性最高為651 MPa和5.97 MPa·m1/2；與單相的ZrB2材料及SiC顆粒增強(qiáng)ZrB2復(fù)合材料相比，斷裂韌性有顯著提高；其主要增韌機(jī)制為裂紋偏轉(zhuǎn)、晶須橋連和拔出

    Abstract:

    ZrB2 based ceramic matrix composites containing two kinds of SiC whiskers were produced at 1800 ℃ under a uniaxial load of 30 MPa by hot-pressing. The microstructure and mechanical properties of the two composites were investigated. The results show that the flexural strength and fracture toughness of composites are related with the aspect ratio of SiC whisker: the larger the aspect ratio is, the better of the properties of materials. The maximum flexural strength and the fracture toughness are 651 MPa and 5.97 MPa.m1/2, respectively. The mechanical properties, especially the fracture toughness, are much higher than that of monolithic ZrB2 and SiC particles reinforced ZrB2 composites due to the main toughening mechanisms of crack deflection, whisker bridging and pullout.

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陳德江,劉成勇,徐 林,韓文波.熱壓燒結(jié)制備SiCw/ZrB2陶瓷復(fù)合材料的研究[J].稀有金屬材料與工程,2009,38(9):1634~1637.[Chen Dejiang, Liu Chengyong, Xu Lin, Han Wenbo. ZrB2 Matrix Ceramic Composites by Hot-Pressed and SiC Whisker Reinforced[J]. Rare Metal Materials and Engineering,2009,38(9):1634~1637.]
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  • 收稿日期:2008-09-28
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