| Al_2O_3-TiC 和 Al_2O_3-TiB_2 的热力学分析 |
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| 引用本文： | 夏天东,唐燕玲,刘天佐,赵文军,陈学定,王天民. Al_2O_3-TiC 和 Al_2O_3-TiB_2 的热力学分析[J]. 兰州理工大学学报, 1998, 0(4) |
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| 作者姓名： | 夏天东 唐燕玲 刘天佐 赵文军 陈学定 王天民 |
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| 作者单位： | 甘肃工业大学材料工程系，北京航空航天大学 |
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| 摘 要： | 从理论上对铝热剂燃烧合成复相陶瓷Ａｌ２Ｏ３－ＴｉＣ和Ａｌ２Ｏ３－ＴｉＢ２的绝热温度及产物中Ａｌ２Ｏ３的熔化率进行了研究．随着预热温度的升高或稀释剂含量的降低，反应体系的绝热温度升高，但在２３０３Ｋ处均出现一个平台，其原因是Ａｌ２Ｏ３的熔化率不固定，在０～１之间变化．随预热温度的升高，燃烧反应能够自我维持的临界稀释剂的添加量也增多．
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| 关 键 词： | 复相陶瓷，热力学，绝热温度，稀释剂，预热温度 |
Thermodynamic analysis of Al 2O 3 TiC and Al 2O 3 TiB 2 ceramic composites |
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| Xia Tiandong,Tang Yanling,Liu Tianzuo,Zhao Wenjun,Chen Xueding. Thermodynamic analysis of Al 2O 3 TiC and Al 2O 3 TiB 2 ceramic composites[J]. Journal of Lanzhou University of Technology, 1998, 0(4) |
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| Authors: | Xia Tiandong Tang Yanling Liu Tianzuo Zhao Wenjun Chen Xueding |
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| Abstract: | The adiabatic temperature T ad and melting rate R m of Al 2O 3 in the combustion synthesis of Al 2O 3 TiC and Al 2O 3 TiB 2 ceramic composites by aluminothermic reactions were analyzed theoretically. The higher the preheating temperature is or the less the amount of diluents is, the higher the adiabatic temperature of reaction system is. There is a plateau at temperature of 2 303 K in the combustion temperature profile because the R m of Al 2O 3 is not regular but changes from 0 to 1. The critical mole of diluents, which the combustion reaction could be self sustained without outside energy, increases with the increase of preheating temperature. |
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| Keywords: | ceramic composite thermodynamics adiabatic temperature diluent preheating temperature |
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