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影响颗粒增强铝基复合材料热导率因素研究

Study of Factors on the Thermal Conductivity of Particle-re-inforced Aluminum matrix Composites
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摘要 研究了颗粒种类、粘接剂含量和界面状态对颗粒增强铝基复合材料热导率的影响.制备了碳化硅和立方氮化硼两种颗粒及粘接剂添加量不同复合材料,并通过1 300 ℃下湿氧气氛氧化、氢氟酸酸洗及将复合材料在600 ℃时进行长时间热处理从而获得不同的界面状态.由于立方氮化硼颗粒本身的热导率高于碳化硅颗粒,尽管前者的体积分数高,但其复合材料的热导率仍高于后者.随着粘接剂添加量增多,复合材料的热导率逐渐降低.高温湿氧气氛处理后,碳化硅颗粒表面被氧化硅覆盖,制备的复合材料热导率明显降低;酸洗处理后,碳化硅颗粒中的杂质基本去除,制备的复合材料热导率得到提高.随着高温处理时间延长,复合材料的热导率先升高后降低.
出处 《特种铸造及有色合金》 CAS CSCD 北大核心 2003年第z1期20-22,共3页 Special Casting & Nonferrous Alloys
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