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機(jī)械誘發(fā)自蔓延反應(yīng)合成Ti3SiC2的機(jī)理研究
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Study of Reaction Mechanism for Synthesis of Ti3SiC2 by Mechanically Induced Self-Propagation Reaction
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    摘要:

    機(jī)械合金化3Ti/Si/2C粉體，會誘發(fā)自蔓延反應(yīng)，產(chǎn)生組成相為TiC、Ti3SiC2、TiSi2和Ti5Si3的粉體與塊體產(chǎn)物。獲得的粉體和塊體產(chǎn)物中Ti3SiC2含量分別約為17.6%和58.2%（質(zhì)量分?jǐn)?shù)，下同）。本研究提出了一個機(jī)械誘發(fā)自蔓延反應(yīng)合成Ti3SiC2的反應(yīng)機(jī)制，即Ti3SiC2是從固相TiC與Ti-Si液相中形核并長大。最后討論了機(jī)械誘發(fā)自蔓延反應(yīng)與自蔓延高溫?zé)Y(jié)對合成產(chǎn)物中Ti3SiC2含量及顯微形貌的影響。

    Abstract:

    The powders and bulks product composed of TiC, Ti3SiC2, TiSi2 and Ti5Si3 were synthesized by mechanically induced self-propagation reaction (MSR) during mechanical alloying of 3Ti/Si/2C powders. The Ti3SiC2 content of the powders and bulks was about 17.6% and 58.2% (mass fraction, similarly hereinafter), respectively. A reaction mechanism for the synthesis of Ti3SiC2 by MSR was proposed. The mechanism indicated that Ti3SiC2 nucleated and grew in solid TiC and Ti-Si liquid. The effects of MSR and self-propagation high temperature sintering on the content and microstructure of Ti3SiC2 in products were discussed finally.

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梁寶巖,韓 欣,王明智.機(jī)械誘發(fā)自蔓延反應(yīng)合成Ti3SiC2的機(jī)理研究[J].稀有金屬材料與工程,2009,38(10):1727~1730.[Liang Baoyan, Han Xin, Wang Mingzhi. Study of Reaction Mechanism for Synthesis of Ti3SiC2 by Mechanically Induced Self-Propagation Reaction[J]. Rare Metal Materials and Engineering,2009,38(10):1727~1730.]
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  • 收稿日期:2008-10-30
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