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雙連續(xù)TiB2-Cu基發(fā)汗陶瓷復(fù)合材料抗燒蝕行為
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TB333

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國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目（90205034）;自然科學(xué)基金重點(diǎn)項(xiàng)目（90505015）資助


Ablation-Resistance Behavior of Sweat Cooling TiB2-Cn Matrix Interpenetrating Phase Composites
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    摘要:

    用粉末燒結(jié)結(jié)合自發(fā)浸滲法制備高體積TiB2含量（～83％）的雙連續(xù)TiB2／Cu基復(fù)合材料。利用掃描電鏡（SEM）和電子探針（EPMA）分析了試驗(yàn)材料燒蝕前后微觀組織形貌。用等離子火炬電弧加熱器對(duì)材料表面瞬時(shí)加熱來考察復(fù)合材料的抗熱沖擊和抗燒蝕行為。結(jié)果表明：材料在電弧加熱和冷卻過程中沒有出現(xiàn)崩裂現(xiàn)象，材料表面也沒有裂紋產(chǎn)生，說明該材料具有良好的抗熱沖擊性能；微觀組織分析表明，金屬Cu相在材料燒蝕區(qū)-過渡區(qū)-基體區(qū)存在明顯的梯度分布，靠近燒蝕區(qū)沒有檢測(cè)到金屬相的存在，說明在高溫下金屬起到了“發(fā)汗冷卻”作用，燒蝕機(jī)理為金屬相的發(fā)汗冷卻、化學(xué)燒蝕和機(jī)械剝蝕。

    Abstract:

    TiB2/Cu matrix Interpenetrating phase composites (IPCs) with high ceramic content (~vol.83%) were prepared adopting high temperature sintering and subsequently melt-infiltration. The morphologies and microstructures of TiB2/Cu IPCs before and after thermal ablation were studied by SEM and EPMA. The thermal shock behavior and ablation-resistance of TiB2/Cu IPCs were investigated using plasma arc heating. The results showed that no crack was found on the ablated surface during the process of instantaneous heating and cooling, which revealed that TiB2/Cu IPCs have a good thermal shock resistance. Melt Cu phase presented obviously a gradual distribution among the ablation zone, transition zone and matrix zone, and no metal phase was detected near the ablation zone, it means that the melt play a role of sweat cooling during elevated temperature. The ablation-resistance mechanisms mainly include sweat cooling, chemical ablation and mechanical denudation.

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洪長(zhǎng)青 韓杰才 張幸紅 孟松鶴 李金平.雙連續(xù)TiB2-Cu基發(fā)汗陶瓷復(fù)合材料抗燒蝕行為[J].稀有金屬材料與工程,2007,36(3):546~549.[Hong Changqing, Han Jiecai, Zhang Xinghong, Meng Songhe, Li Jinping. Ablation-Resistance Behavior of Sweat Cooling TiB2-Cn Matrix Interpenetrating Phase Composites[J]. Rare Metal Materials and Engineering,2007,36(3):546~549.]
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  • 最后修改日期:2006-01-28
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