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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. 相似文献
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自生铝基复合材料的制备,性能及生成机理 总被引:15,自引:0,他引:15
主要介绍了自生铝基复合材料制备工艺的最新进展,讨论了自生铝基复合材料的性能及生成机理。 相似文献
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Al2O3/Al陶瓷基复合材料的组织与性能 总被引:9,自引:5,他引:4
研究了反应自生复合的Al2O3/Al陶瓷基复合材料的组织与性能间的关系,结果表明,该复合材料的弯曲强度和断裂韧度受到组织中的铝合金含量和孔隙率的影响。当金属质量分数为20%~30%时,复合材料的弯曲强度和断裂韧度分别达到380~420MPa和8.5~9.5MPa·m12。组织中的孔隙对Al2O3/Al复合材料的性能是非常有害的,特别是当复合材料中的金属质量分数小于10%时,孔隙对复合材料的性能危害更大。 相似文献
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