【摘要】 采用原位反应近液相线铸造法制备了Al₂O₃/Cu复合材料并在该复合材料中添加La₂O₃,研究La₂O₃对Al₂O₃/Cu复合材料的组织结构、显微硬度以及导电性能的影响.结果表明,在La₂O₃-Al-CuO体系中的原位反应产物主要为Al₂O₃、CuAlO₂、LaAlO₃等化合物.稀土La₂O₃对Al₂O₃/Cu复合材料的铸态组织具有明显的细化作用,当La₂O₃的添加量达到0.5wt%时,组织最为细小,显微硬度达到最大值68.7HV;但加入La₂O₃,使得Al₂O₃/Cu复合材料的导电性下降.更多还原

【Abstract】 The Al₂O₃/Cu composite materials were prepared by in-situ reaction near-liquid line casting method,and La₂O₃ was added to the composite material.The effects of La₂O₃ addition on the structure,microhardness and electrical conductivity of Al₂O₃/Cu composite materials were studied.The results show that the reaction products in La₂O₃-Al-CuO system are mainly Al₂O₃,CuAlO₂ and LaAlO₃.With the addition of La₂O₃,the as-cast microstructure of Al₂O₃/Cu composite material is obviously refined.When the amount of La₂O₃ is 0.5 wt%,the microstructure is the finest and the micro-hardness reaches the maximum of 68.7 HV.However,the electrical conductivity of Al₂O₃/Cu composites decreases with the addition of La₂O₃.更多还原