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Cf／SiO2復(fù)合材料的組織性能與強(qiáng)韌化機(jī)理
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Microstructure, Properties and Mechanisms of Reinforcing for Cf/SiO2 Ceramic Matrix Composite
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    摘要:

    采用真空熱壓燒結(jié)工藝制備了高致密的短C纖維（Cf)補(bǔ)強(qiáng)增韌SiO2基復(fù)合材料，研究了其組織結(jié)構(gòu)、力學(xué)性能和強(qiáng)韌化機(jī)制。10％Cf/SiO2復(fù)合材料非晶態(tài)基體SiO2只發(fā)生部分晶化，Cf在基體中分布較均勻，并呈層狀分布。復(fù)合材料強(qiáng)度、斷裂韌性和斷裂應(yīng)變均基體顯著改善，分別達(dá)到74MPa,2.4MPa.m^1/2和0．144％。壓痕裂紋擴(kuò)展行為和斷口分析表明，Cf的橋接、拔出和誘導(dǎo)裂紋傳轉(zhuǎn)等是復(fù)合材料的強(qiáng)韌化機(jī)制。

    Abstract:

    The microstructure, mechanical properties, the mechanisms of strengthening and toughening for the 10%C f/SiO 2 composite prepared by vacuum hot pressing, were studied. The SiO 2 glass matrix crystallized partially after hot pressing. The composite has a lamellar structure with the carbon fibers in parallel with the hot pressing plane. The bending strength, fracture toughness and fracture strain of the composite are significantly improved, compared with that of the matrix. Bridging and pulling out of carbon fibers and crabon fibers and crack deflection induced by the carbon fibers are the principal mechanisms of strengthening and toughening.

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賈德昌 周玉 等. Cf／SiO2復(fù)合材料的組織性能與強(qiáng)韌化機(jī)理[J].稀有金屬材料與工程,2001,(6):437~439.[Jia Dechang, Zhou Yu, Lei Tingquan. Microstructure, Properties and Mechanisms of Reinforcing for Cf/SiO2 Ceramic Matrix Composite[J]. Rare Metal Materials and Engineering,2001,(6):437~439.]
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  • 最后修改日期:2000-01-03
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