| Formation of composites fabricated by exothermic dispersion reaction in A1-TiO2-B2O3 system |
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| 作者姓名： | 朱和国 王恒志 葛良琦 陈湜 吴申庆 |
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| 作者单位： | [1]Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; [2]Department of Materials Science and Engineering, Southeast University, Nanjing 210096, China |
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| 基金项目： | Foundation item： Project（BK2006207） supported by the Natural Science Foundation of Jiangsu Province, China |
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| 摘 要： | The formation of aluminum matrix composites fabricated by exothermic dispersion reaction in A1-TiO2-B2O3 system was investigated. The thermal analysis results show that the reactions are spontaneous and exothermic. The Gibbs free energy of α-Al2O3 is the lowest among all the combustion products, followed by TiB2 and Al3Ti. It is noted that when the B2O3/TiO2 mole ratio is below 1, the reaction products are composed of particle-like α-Al2O3, TiB2 and rod-like Al3Ti. The α-Al2O3 crystallites, resulting from the reaction between A1 and TiO2 or B2O3, are segregated at the grain boundaries due to a lower wettability with the matrix. SEM micrographs show that rod-like Al3Ti phase distributes uniformly in the matrix. When the BEO3/TiO2 mole ratio is around 1, the Al3Ti phase almost disappears in the composites, and the distribution of α-Al2O3 particulates is improved evidently.
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| 关 键 词： | 复合材料 分子比率 发热弥散性能 铝钛复合物 |
| 收稿时间： | 29 May 2006 |
| 修稿时间： | 2006-05-292007-01-22 |
Formation of composites fabricated by exothermic dispersion reaction in A1-TiO2-B2O3 system |
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| ZHU He-guo,WANG Heng-zhi,GE Liang-qi,CHEN Shi,WU Shen-qing,.Formation of composites fabricated by exothermic dispersion reaction in A1-TiO2-B2O3 system[J].Transactions of Nonferrous Metals Society of China,2007,17(3):590-594. |
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| Authors: | ZHU He-guo WANG Heng-zhi GE Liang-qi CHEN Shi WU Shen-qing |
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| Affiliation: | 1. Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; 2. Department of Materials Science and Engineering, Southeast University, Nanjing 210096, China |
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| Abstract: | The formation of aluminum matrix composites fabricated by exothermic dispersion reaction in Al-TiO2-B2O3 system was investigated. The thermal analysis results show that the reactions are spontaneous and exothermic. The Gibbs free energy of α-Al2O3 is the lowest among all the combustion products, followed by TiB2 and Al3Ti. It is noted that when the B2O3/TiO2 mole ratio is below 1, the reaction products are composed of particle-like α-Al2O3, TiB2 and rod-like Al3Ti. The α-Al2O3 crystallites, resulting from the reaction between Al and TiO2 or B2O3, are segregated at the grain boundaries due to a lower wettability with the matrix. SEM micrographs show that rod-like Al3Ti phase distributes uniformly in the matrix. When the B2O3/TiO2 mole ratio is around 1, the Al3Ti phase almost disappears in the composites, and the distribution of α-Al2O3, particulates is improved evidently. |
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| Keywords: | aluminum matrix composite reaction mechanism mole ratio exothermic dispersion reaction |
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