Cu/La_(2)NiO_(4)电接触材料的制备及电弧烧蚀性能研究

PREPARATION OF CU/LA2NIO4 ELECTRICAL CONTACT MATERIALS AND STUDY ON ARC EROSION PERFORMANCE

解决铜基触点材料因易氧化而生成不导电物质导致触点失效的关键在于提高材料的导电性能,基于导电陶瓷La_(2)NiO_(4)因其具有导电性能,论文采用溶胶凝胶法制备获得了导电陶瓷La_(2)NiO_(4)粉体,用粉末冶金法制备出致密Cu/La_(2)NiO_(4)复合材料并进行微观形貌观察和物相分析。经过电弧烧蚀后,观察表面烧蚀形貌,探讨氧化层的微观组织,并进行温升测试。研究结果表明,电弧烧蚀后的Cu/La_(2)NiO_(4)复合材料表面有裂纹并且触点表面有多种侵蚀形貌特征并存,氧化层可能因接触力的作用而脱落以提高导电性能。本论文的研究工作表明,采用铜掺杂导电陶瓷La_(2)NiO_(4)的方法,可以有效提高电触点材料电弧烧蚀后的导电性。

The key to solve the contact failure,caused by copper-based contact material's formation of non-conductive substances due to easily oxidized,is to enhance the material's electrically conducting properties.Based on the electrically conducting properties of the ceramic La_(2)NiO_(4),this paper added the sol-gel method to produce conductive ceramic La_(2)NiO_(4) powder.Subsequently,dense Cu/La_(2)NiO_(4) composites were prepared by powder metallurgy method,and the micrograph observation and XRD pattern phase analysis were carried out.After arc erosion,micrographs of the surface and erosion layer were discussed and temperature rise were tested.The results show that there are cracks and various arc erosion morphology characteristics on the surface of Cu/La_(2)NiO_(4) composite after arc erosion.Additionally,the study reveals that the application of contact force may lead to the detachment of the oxide layer,enhancing the electrically conducting properties.This paper's research work demonstrates that the method of copper-added conductive ceramic La_(2)NiO_(4)can effectively enhance the electrically conducting properties of electrical contact materials after arc erosion.