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通过对表面改性后的金刚石同铝粉进行烧结,对比研究了不同的界面层对复合材料导热率的影响。实验表明,通过表面改性制备的镀Ti金刚石/Al复合材料,在同样制备条件下其热导率和致密度性能优于表面未镀覆的金刚石/Al复合材料。金属基体中,Si元素的添加能有效降低烧结体的烧结温度,但是其热导率低于基体中未添加杂质元素的镀Ti金刚石/Al复合材料。金刚石/Al复合材料的热导率同界面结构有关,镀覆合适的金属元素能有效改善金刚石对铝的润湿性,降低界面热阻,从而能有效提高金刚石/铝复合材料的导热率。
The effect of different interfacial layers on the thermal conductivity of composites was studied by sintering the surface modified diamond with aluminum powder. Experiments show that the surface-modified Ti-coated diamond / Al composites have better thermal conductivity and density properties than the uncoated diamond / Al composites under the same preparation conditions. In the metal matrix, the addition of Si can effectively reduce the sintering temperature of the sintered body, but its thermal conductivity is lower than that of the Ti-plated diamond / Al composite without any additional elements in the matrix. The thermal conductivity of the diamond / Al composites is related to the interfacial structure. Plating the appropriate metal elements can effectively improve the wettability of diamond to aluminum and reduce the thermal interface resistance, which can effectively improve the thermal conductivity of diamond / aluminum composites.