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Thermodynamic Analysis and Preparation of Composites in Zr-Si-C-N-O System
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Thermodynamic Analysis and Preparation of Composites in Zr-Si-C-N-O System
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Natural Science Foundation of Henan Educational Committee (2011B430011)

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    摘要:

    為了得到鋯英石碳熱還原氮化反應時產(chǎn)物相的穩(wěn)定存在區(qū)域，用法對Zr-Si-C-N-O系進行了熱力學計算和分析，繪制了Zr-Si-C-N-O系優(yōu)勢區(qū)相圖。結果表明：通過控制配碳量、反應溫度、爐內的CO分壓和N2分壓，可以獲得組成分別為ZrO2-Si2N2O、ZrN-Si2N2O或ZrN-Si3N4等的復相材料。根據(jù)熱力學分析結果，以鋯英石、活性炭為原料，N2（99.999%）為氮源，研究了配碳量（10%，20%，22%，30%，質量分數(shù)）對鋯英石碳熱還原氮化反應失重率及產(chǎn)物相組成的影響。結果表明：配碳量不僅顯著影響鋯英石碳熱還原氮化反應產(chǎn)物的物相組成，而且配碳量的增加還會降低鋯英石碳熱還原氮化反應的開始溫度。

    Abstract:

    In order to obtain the diagrams of stability relations (namely, predominance area phase diagram, PAPD) for carbothermal reduction and nitridation (CRN) of zircon, the thermodynamic calculation and the analysis on the Zr-Si-C-N-O system were carried on by the method of , and PAPD of the Zr-Si-C-N-O system was constructed. The CRN of zircon may lead to the formation of different oxide-nitride composites such as ZrO2-Si2N2O, ZrN-Si2N2O, and ZrN-Si3N4 by controlling reaction conditions of carbon proportion, temperature, and partial pressures of CO and N2. Zircon powder (45 μm), activated carbon and N2 (99.999%) were used as the starting materials, the effect of carbon proportion on the mass loss and the product phase composition after CRN of zircon was investigated. Carbon proportion affects the yielded reaction products obviously; and the higher the carbon proportion, the lower the starting temperature for the CRN to occur.

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于仁紅,周寧生,張菲菲. Thermodynamic Analysis and Preparation of Composites in Zr-Si-C-N-O System[J].稀有金屬材料與工程,2014,43(2):301~305.[Yu Renhong, Zhou Ningsheng, Zhang Feifei. Thermodynamic Analysis and Preparation of Composites in Zr-Si-C-N-O System[J]. Rare Metal Materials and Engineering,2014,43(2):301~305.]
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  • 收稿日期:2013-01-15
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  • 在線發(fā)布日期: 2014-06-03
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