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为制备高SiC含量的SiCp/60 13Al复合材料 ,把 (SiC +Ti)的混合粉末压坯浸入熔化的铝液中 ,通过反应引发自蔓延反应。反应产物在SiC颗粒表面原位形成涂层 ,改善了SiCp/60 13Al界面的润湿性。SiC颗粒在 80 0℃自重沉降 3 0min ,除去上面部分铝液 ,可制备高SiC含量的复合材料。研究了自蔓延反应机理及复合材料的热膨胀系数、导热系数及其与自蔓延反应之间的关系。并与用离心渗铸法制备的同种材料作比较 ,发现自蔓延反应对材料的热膨胀系数影响不大 ,但由于SiC颗粒表面的反应物涂层热阻较大 ,剧烈的自蔓延反应会损害材料的导热性能。如果反应程度控制适当 ,可以制备低膨胀、高导热的SiCp/60 13Al复合材料
In order to prepare SiCp / 60 13Al composites with high SiC content, a mixed powder compact of (SiC + Ti) was immersed in a molten aluminum solution to initiate a self-propagating reaction. The reaction product forms a coating in situ on the SiC particle surface, improving the wettability of the SiCp / 60 13Al interface. SiC particles self-weight 30 0min precipitation at 80 ℃, remove the above part of the liquid aluminum can be prepared high SiC content of the composite material. The mechanism of self-propagating reaction and the thermal expansion coefficient, thermal conductivity and their relationship with self-propagating reaction were studied. Compared with the same kind of material prepared by centrifugal infiltration casting method, it is found that the self-propagating reaction has little effect on the thermal expansion coefficient of the material, but due to the large thermal resistance of the reactant coating on the SiC particle surface, the severe self-propagating reaction will damage Thermal conductivity of the material. If the degree of reaction control properly, you can prepare low expansion, high thermal conductivity of SiCp / 60 13Al composite