(華南理工大學(xué) 機(jī)電工程系，廣州510641)
摘 要: 研究了綜合攪拌鑄造法和原位反應(yīng)制備Al2O3增強(qiáng)鋁基復(fù)合材料，向熔體中直接加入制備高純Al2O3的原料Al2(SO4)3粉體，由反應(yīng)分解的Al2O3原位合成鋁基復(fù)合材料。用該方法制備復(fù)合材料，既可節(jié)約成本，同時(shí)由Al2(SO4)3分解的SO3可以對熔體進(jìn)行精煉、除氣。結(jié)果表明：Al2O3顆粒和基體結(jié)合良好，沒有發(fā)現(xiàn)氣孔、團(tuán)聚、集聚、偏析，克服了傳統(tǒng)攪拌鑄造所帶來的鑄造缺陷；Al2O3彌散增強(qiáng)鋁基復(fù)合材料具有良好的沖擊韌性和耐磨損性能；分解的SO3對熔體進(jìn)行精煉、除氣被認(rèn)為是顆粒增強(qiáng)鋁基復(fù)合材料走向?qū)嵱没年P(guān)鍵。
關(guān)鍵字: 反應(yīng)分解；復(fù)合材料；鑄造缺陷；Al2(SO4)3
（Department of Electromechanical Engineering,
South China University of Technology, Guangzhou 510641, P.R.China）
Abstract:In-situ processed aluminum matrix composites reinforced by Al2O3 particles decomposed from Al2(SO4)3 was made through stir casting by adding Al2(SO4)3 to the molten alloy. Not only production cost is reduced, but also SO3 decomposed from Al2(SO4)3 can refine and remove the gas from the molten composites. As a result, Al2O3 and the matrix bonded well, thus improving the properties of ductility and wear behavior considerably, and eliminating the defects such as porosity and particles segregation as well. It is considered that the prerequisite to produce particulate reinforced aluminum matrix composites industrially is that SO3 decomposed from Al2(SO4)3 can refine and remove the gas from the molten composites.
Key words: decompose; metal matrix composite; cast defects; Al2(SO4)3
