Improving Properties of Diamond/Cu Composites by Coating Titanium on Diamond Surface and Doping La2O3
Ti was coated on the surface of diamond by using magnetron sputtering,and diamond/Cu composites with 50％(volume fraction)of diamond and different La2O3 contents were prepared by spark plasma sintering.The phase change and surface morphology of the sample were observed,the thermal conductivity of samples was measured by laser flash method,and the sample density was measured by Archimedes drainage method.The results indicate that coating Ti on diamond surface can effectively improve the interface bonding between diamond and Cu,reduce the interface thermal resistance and increase the density.The density of the composite increases from 81.3％without coated with Ti to 93.7％after coated with Ti,and the corresponding thermal conductivity increases from 276 to 427 W·(m·K)-1.On the basis of the above,the addition of La2O3 can make the density of the composite up to 98.6％,and the thermal conductivity up to 523 W·(m·K)-1.All performances of the composite are further improved.
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