空间导电滑环绝缘环片等离子喷涂Al_(2)O_(3)绝缘涂层的性能研究  

Study on the Properties of Plasma Sprayed Al_(2)O_(3)Insulating Coating for Insulating Ring in Space Conductive Slip Ring

作　　者：谢友金[1,2] 李迎春 杨更生[3] 曲昀 邱明 XIE You-jin;LI Ying-chun;YANG Geng-sheng;QU Yun;QIU Ming(Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi’an 710119,China;Key Laboratory of Space Precision Measurement Technology,Chinese Academy of Sciences,Xi’an 710119,China;School of Mechanical and Electrical Engineering,Henan University of Science and Technology,Luoyang 471003,China)

机构地区：[1]中国科学院西安光学精密机械研究所,陕西西安710119 [2]中国科学院空间精密测量技术重点实验室,陕西西安710119 [3]河南科技大学机电工程学院,河南洛阳471003

出　　处：《材料保护》2023年第6期39-45,88,共8页Materials Protection

基　　金：中国科学院青年创新促进会(批准号2018441)资助。

摘　　要：为解决空间导电滑环中非金属绝缘环片存在的结构稳定性差、加工困难等问题,在2A12铝合金基体上利用大气等离子喷涂技术沉积了Al_(2)O_(3)陶瓷涂层,以替代非金属绝缘材料,研究了涂层的物相组成、微观形貌、显微硬度、结合强度和绝缘性能。结果表明:由原始纳米颗粒经过团聚⁃烧结制备的Al_(2)O_(3)球形粉末的物相主要为α⁃Al_(2)O_(3),喷涂后涂层中的Al_(2)O_(3)以α相和γ相共存,涂层与基体的结合良好,涂层的孔隙较低。制备的涂层组织结构均匀致密,涂层内无明显的宏观裂纹和大孔洞,虽未采用封孔处理,但涂层在大气环境下直流电压为1000 V的绝缘电阻测试中仍表现出较高的绝缘性能,可满足空间导电滑环绝缘环片的服役要求。For solving the problems of poor structural stability and machining difficulties of non⁃metallic insulating rings in space conductive slip rings,Al_(2)O_(3)ceramic coatings were deposited on 2A12 aluminum alloy substrate by atmospheric plasma spraying technology to replace non⁃metallic insulating materials,and the phase composition,microscopic morphology,microhardness,bonding strength,and insulation performance of the coating were studied.Results showed that the main phase of Al_(2)O_(3)spherical powder prepared by agglomeration sintering of original nanoparticles wasα⁃Al_(2)O_(3).After spraying,Al_(2)O_(3)in the coating existed asαphase andγphase,and the coating bonded well with the substrate,and the porosity of the coating was relatively lower.Moreover,the as⁃prepared coating had a uniform and dense microstructure,with no obvious macroscopic cracks or large pores inside the coating.Although no sealing treatment was used,the coating still presented high insulation performance in insulation resistance tests with a DC voltage of 1000 V in atmospheric environments,which could meet the service re⁃quirements of space conductive slip ring insulating rings.

关 键 词：空间导电滑环 等离子喷涂 铝合金 Al_(2)O_(3) 绝缘涂层 

分 类 号：TG174.453[金属学及工艺—金属表面处理]