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采用氧/氮气氛喷射沉积技术结合内氧化工艺制备了0.3%Y2O3/0.3%La2O3/0.3%Al2O3/Cu复合材料,并对其在不同温度下进行退火处理。研究了退火对复合材料显微组织、断口形貌、硬度、强度、导电性和电弧侵蚀表面特征的影响。结果表明,随着退火温度的增高,复合材料的晶粒明显长大,其电导率逐渐增加,而硬度和抗拉强度下降。当退火温度达到1000℃时,基体开始出现退火孪晶。复合材料的拉伸断口形貌表现为大而深的韧窝,是典型的微孔缩聚型断裂,韧窝里的质点为金属氧化物颗粒。其电弧侵蚀表面呈现出大量的浆糊状凝结物和气泡。
The 0.3% Y2O3 / 0.3% La2O3 / 0.3% Al2O3 / Cu composites were prepared by oxygen / nitrogen atmosphere spray deposition combined with internal oxidation process, and annealed at different temperatures. The effects of annealing on the microstructure, fracture morphology, hardness, strength, electrical conductivity and surface erosion of the composites were investigated. The results show that with the increase of annealing temperature, the grain size of the composite obviously increases, its electrical conductivity increases gradually, while the hardness and tensile strength decrease. When the annealing temperature reaches 1000 ℃, the matrix began to appear annealing twins. Tensile fracture morphology of the composites is characterized by large and deep dimples, typical microporous polycondensation fractures, and the particles in the dimples are metal oxide particles. The arc erosion surface showed a lot of paste-like condensate and bubbles.