钛镀层对金刚石/铝导热复合材料的显微组织与热学性能的影响  

Effect of Ti Coating on Microstructure and Thermal Property of Diamond/Al Composite

作　　者：薛晨[1] 白华[1] 吕继磊[1] 王少龙[1] 江南[1] 

机构地区：[1]中国科学院宁波材料技术与工程研究所,浙江宁波315201

出　　处：《硬质合金》2016年第4期217-222,共6页Cemented Carbides

基　　金：国家青年基金(51501209);中国博士后基金(2015M580530);宁波市自然科学基金(2015A610090);国际合作基金(S2015ZR1100)~~

摘　　要：采用高温盐浴法对金刚石表面进行镀钛处理来改善金刚石和铝基之间的界面结合,镀钛后的金刚石颗粒表面略显粗糙,表面的镀层均匀;采用真空热压烧结法制备高导热金刚石/铝复合材料,研究了金刚石表面镀钛对复合材料显微组织、热膨胀系数和热导率的影响。结果表明:金刚石表面的钛镀层改善了金刚石各晶面与铝基体的结合状态,增加了金刚石和铝之间的界面结合强度;当铝基体在镀钛金刚石颗粒形成的骨架结构中膨胀时,可以被骨架很好的约束,从而降低了复合材料的热膨胀系数;金刚石表面钛镀层减少了复合材料的孔洞,增加了致密度,从而提高了复合材料的热导率。Ti layer was introduced onto diamond particles to improve the interfacial bonding between diamond and Al alloy. The diamond/Al composites with Ti coating on diamond particles were prepared via hot vacuum pressing. The effect of Ti coating on microstructure and thermal property of the composite was studied. The results show that the interfacial bonding between diamond and Al is improved and the interfacial bonding strength is enhanced. The thermal expansion behavior of Al matrix can be well restricted by the coated diamond particles and the coefficient of thermal expansion（CTE） of the composite is decreased. The pores are significantly decreased which therefore increases the relative density of the composite. This is the main reason that the thermal conductivity（TC） of the composite is improved.

关 键 词：复合材料 热导率 微观结构 

分 类 号：TB306[一般工业技术—材料科学与工程]