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为了克服Ag作为超导基底时的高温使用缺陷,提高Ag的熔点及其力学性能,选择了高熔点的Al2O3作为掺杂物,通过传统粉末冶金方法制备了Al2O3/Ag基复合材料.结果表明,在Ag基体中掺杂≥1%Al2O3粒子可以提高Ag的熔化温度tm至970℃以上,Al2O3质量分数大于3%时,样品tm可提高至990℃以上.在Al2O3质量分数小于3%样品中,2%Al2O3/Ag基复合材料具有最大的硬度、抗拉强度以及最小的线膨胀系数与延伸率.由于2%Al2O3/Ag样品具有合适的熔化温度、接近于YBaCuO的线膨胀系数和最好的力学性能,满足了后期Ar气氛下热处理YBaCuO超导带材对基底的要求.
In order to overcome the defects of high-temperature use of Ag as a superconducting substrate and improve the melting point and mechanical properties of Ag, Al2O3 with high melting point was selected as the dopant and Al2O3 / Ag matrix composites were prepared by conventional powder metallurgy method. In the Ag matrix doped ≥ 1% Al2O3 particles can increase the melting temperature t Ag above 970 ℃, Al2O3 mass fraction greater than 3%, the sample tm can be increased to above 990 ℃ in the Al2O3 mass fraction of less than 3% The 2% Al2O3 / Ag matrix composites have the highest hardness, tensile strength, and the smallest coefficient of linear expansion and elongation.Because the 2% Al2O3 / Ag samples have suitable melting temperature, the linear expansion coefficient close to that of YBaCuO and the best Mechanical properties, to meet the later Ar atmosphere heat treatment YBaCuO superconducting tape substrate requirements.