金刚石/铝复合材料的界面结构

Interfacial Structures of Diamond/Al Composite Materials

研究了高体积分数（60%）单晶金刚石/铝复合材料的界面区域的微结构和形貌.为了得到这种高导热性能的复合材料,在合成中使用了无压金属浸渗技术.该铝基复合材料由铝-硅-镁合金和金刚石单晶颗粒组成,其化学和热性质由其界面特征决定.在复合材料的断裂面上,我们发现金刚石和铝优先和金刚石的（100）晶面结合.大部分铝-金刚石界面清晰,然而有一些铝和金刚石中间区域存在明显的50~200nm厚的化合物层,这是在中间形成了碳化铝（Al4C3）.

Both microstructure and morphology at the interracial regions of Al-matrix composites reinforced by high-volume fractions （60% ） of monocrystalline synthetic diamond particles are investigated. To obtain composite materials with high thermal conductivities, a novel technique including pressureless metal infiltration was employed. Aluminium-matrix composites was fabricated and reinforced using aluminum-silicon-magnesium alloy with diamond single crystals. Atthe interracial surfaces of the fractured composites, it was found that preferential adhesion between aluminum and diamond occurs on the { 100 } crystalline faces of diamond. The interface characteristics are related to Al-matrix chemistry, and thermal properties of the composite materials are with respect to the interface characteristics. The Al-diamond interface is generally clean, however, a distinct 50 - 200 nm thick layer at the interface between Al-matrix and the diamond particleis occasionally observed, aluminium carbide phases （A14C3） are formed in.