采用不同Al含量(0.20％、0.35％和0.50％,质量分数)的Cu-Al合金薄板内氧化法制备Cu-Al2O3薄板复合材料.对比分析了相同内氧化温度和时间下,不同Al含量的Cu-Al合金薄板内氧化制备出的Cu-Al2O3薄板复合材料的组织性能.并尝试采用Cu-Al2O3薄板复合材料重熔法制备Al2O3颗粒弥散分布的Cu-Al2O3块体复合材料.结果表明,Cu-Al2O3薄板复合材料内氧化层外部晶粒比内部晶粒细小;随着Al质量分数的增加,在相同的内氧化时间下,内氧化层的深度逐渐减小,内氧化层的内部晶粒逐渐粗化;内氧化后所得复合材料的Cu基体中弥散分布着大量的γ-Al2O3,γ-Al2O3粒径为10 ～ 30 nm,粒子间距为20～70 nm;复合材料中的γ-Al2O3强化了Cu基体,与合金相比复合材料表面硬度显著增加,从复合材料表面到内部硬度逐渐减小;Cu-Al2O3薄板复合材料重熔后Al2O3颗粒团聚且上浮;薄板复合材料重熔法制备Al2O3颗粒弥散分布的Cu-Al2O3块体复合材料不可行.
Cu-Al2O3 composite sheets were prepared by internal oxidation used Cu-Al alloy sheets with different Al content (0.2％,0.35％ and 0.5％,mass) as raw materials.Microstructure and properties of the Cu-Al2O3 composite sheets under the same oxidation temperature and time were studied.Meanwhile,the Cu-Al2O3 bulk composites were tried to prepare by re-melting method used the Cu-Al2O3 composites sheets with dispersive distribution of Al2O3 particles.The results show that the external grains in the internal oxidation layer of the Cu-Al2O3 composite sheets are smaller than that of internal grains.With the increasing Al content,under the same oxidation time,the internal oxidation layer depth becomes smaller and the internal grains become coarser.A large amount of the γ-Al2O3 phase is distributed in the Cu matrix of the composites prepared by internal oxidation.The size of the γ-Al2O3 particles is 10-30 nm and the particle spacing is 20-70 nm.The γ-Al2O3 phase strengthens the Cu matrix,so the hardness of the composites surface is significantly increased compared with the alloy,and the hardness gradually decreases from the surface to the inside.Al2O3 particles in the Cu-Al2O3 sheets aggregate and grow after re-melting.Thus,re-melting of composite sheets to prepare the Cu-Al2O3 bulk composites is unfeasible.
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