摘要
研究了一种新型简化的内氧化工艺，制备了不同氧源系数的Cu-Al2O3复合材料，对所制备复合材料的烧结态和经60％、70％、80％变形后的微观组织、硬度、导电率进行了分析。结果表明：该简化工艺成功制备了Cu-Al2O3复合材料，在铜基体上弥散分布着细小粒状Al2O3颗粒，其粒径约为5～20nm，颗粒间距约为25～60nm复合材料变形后，其硬度明显提高，最大值达到144HV，而导电率则随变形量的增大先升高后降低，但降幅很小；当氧源系数k为1．20h，压制粉末烧结（950℃，4h）后全部完成内氧化，且变形后综合性能最优，此时氧化剂含量为最佳的添加量。
Cu-Al2O3 composites with different oxygen resource coefficients were prepared by a new simplified internal oxidation technique. The microstructure and hardness, electrical conductivity of composites after sintering and deforming were investigated. The results indicate that Cu-Al2O3 composites are prepared successfully by the simplified technique, a mass of fine Al2O3 particles are dispersed in the copper base, the size of Al2O3 particles is about 10-20 nm in diameter,and the spatial distance between particles is about 25-60 nm. The hardness is obviously increased after deforming of 60%, 70% and 80%, and the maximum peak value reaches 144 HV. Electrical conductivity increases at the beginning and then decreases with the increasing of deformation. After sintering at 950 ℃ for 4 h, the internal oxidation of compressed Cu-Al alloy powder is completed, and the comprehensive performance is optimum after deforming when the oxygen resource coefficient （k） is 1.20. So it is the optimum oxidant content for internal oxidation under this process.
出处
《铸造技术》
CAS
北大核心
2007年第3期312-315,共4页
Foundry Technology
基金
河南省杰出青年基金项目(0521002700)
河南省高校创新人才培养工程(豫教高2005-126)
关键词
CU-AL2O3复合材料
内氧化
氧源系数
冷变形
Cu-Al2O3 composite
Internal oxidation
Oxygen resource coefficient
Cold deformation
