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以Sm2O3、BaCO3和CuO为原料,采用固相法合成SmBa2Cu3O7--δ(SmBaCuO)粉体。将银粉添加到SmBaCuO中,制备出Ag/SmBaCuO金属陶瓷。借助于X射线衍射、扫描电子显微镜、透射电子显微镜和X射线能谱仪分析Ag/SmBaCuO陶瓷的显微结构和形貌,利用摩擦实验机测试了Ag/SmBaCuO陶瓷与对偶件钢的摩擦性能。结果表明:添加银粉后,SmBaCuO金属陶瓷的结构没有改变,银分布在SmBaCuO基底中,Ag/SmBaCuO仍具有超导电性。从室温至液氮温度,SmBaCuO的摩擦系数正常态下为0.31,超导态下为0.2左右。常温下测试(5%~10%)Ag/SmBaCuO摩擦系数为0.23,15%Ag/SmBaCuO磨损率最低为6.340×10--5 mm3/(N·m)。Ag/SmBaCuO金属陶瓷中银微粒在摩擦过程中向对偶表面转移,起到固体润滑剂的作用,改善了Ag/SmBaCuO陶瓷的摩擦性能。
SmBa2Cu3O7 - δ (SmBaCuO) powders were synthesized by solid state method using Sm2O3, BaCO3 and CuO as raw materials. Silver powder was added to SmBaCuO to prepare Ag / SmBaCuO cermet. The microstructure and morphology of Ag / SmBaCuO ceramics were analyzed by means of X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray energy dispersive spectroscopy. The tribological properties of Ag / SmBaCuO ceramics and their counterpart steel were tested by friction tester. The results show that the structure of SmBaCuO cermets does not change after silver powder is added. The silver is distributed in the SmBaCuO substrate, and the Ag / SmBaCuO still has superconductivity. From room temperature to liquid nitrogen temperature, the friction coefficient of SmBaCuO is 0.31 in normal state and 0.2 in superconducting state. The friction coefficient of Ag / SmBaCuO was 0.23 at room temperature (5% -10%), and the lowest wear rate was 6.340 × 10-5 mm3 / (N · m) at 15% Ag / SmBaCuO. Ag / SmBaCuO cermets silver particles in the friction process to the dual surface transfer, play the role of a solid lubricant to improve the friction properties of Ag / SmBaCuO ceramics.