Ag/Bi_2Sr_2Ca_2Cu_3O_x自润滑材料的制备和性能

Preparation and Properties of the Ag/Bi_2Sr_2Ca_2Cu_3O_x Self-lubricating Materials

用粉末冶金法制备银掺杂的Ag/Bi2Sr2Ca2Cu3O x(简称Ag/Bi2223)超导材料,用XRD和金相显微镜对试样进行物相分析和显微结构测试,用摩擦试验机对试样进行摩擦学性能测试,用SEM和EDXA对试样的磨损表面形貌和元素成分进行分析。结果表明:Ag微粒在Bi2223基体中均匀分布,改善了其力学性能,但没有改变Bi2223超导电性;Ag的添加使Bi2223的摩擦因数和磨损率明显降低,其中5%Ag/Bi2223的耐磨性能最好;基体中的银在摩擦过程中向表面转移,使Ag/Bi2223材料表现出自润滑性能。

The silver doped Bi2223 superconducting ceramics were prepared by powder metallurgic method. The structure and morphology of the synthesized samples were investigated by XRD, SEM, EDXA and Metallographic microscope. The tribological properties of the Ag/Bi2223 samples were measured on the friction and wear tester at room temperature. The results indicate that the silver particles are evenly distributed in the Bi2223 matrix,they have no influence on the superconductivity of Bi2223 ceramics, while improving its mechanical properties. The friction coefficient and wear rate of Bi2223 ceramics are decreased obviously after adding the silver particles, and the 5% Ag/Bi2223 samples have the minimum wear rate. The soft silver film is formed on the surface of Ag/Bi2223 ceramics during friction process, and Ag/Bi2223 superconducting ceramics show improved tribological properties.