空间导电滑环绝缘环片等离子喷涂Al2O3绝缘涂层的性能研究

谢友金; 李迎春; 杨更生; 曲昀; 邱明

doi:10.16577/j.issn.1001-1560.2023.0133

材料保护 >

2023 , Vol. 56 >Issue 6: 39 - 45

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0133

试验研究

空间导电滑环绝缘环片等离子喷涂Al₂O₃绝缘涂层的性能研究

谢友金 ,
李迎春 ,
杨更生 ,
曲昀 ,
邱明

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1.中国科学院 a.西安光学精密机械研究所, b.空间精密测量技术重点实验室,陕西西安 710119;
2.河南科技大学机电工程学院,河南洛阳 471003

李迎春(1969-),硕士,副教授,研究方向为表面工程及摩擦学,电话:13592088916,E-mail: lyc2004henan.china@126.com

收稿日期: 2022-12-23

修回日期: 2023-01-15

录用日期: 2023-02-15

网络出版日期: 2023-07-14

基金资助

中国科学院青年创新促进会(批准号2018441)资助

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Study on the Properties of Plasma Sprayed Al₂O₃ Insulating Coating for Insulating Ring in Space Conductive Slip Ring

XIE You-jin ,
LI Ying-chun ,
YANG Geng-sheng ,
QU Yun ,
QIU Ming

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1a. Xi’an Institute of Optics and Precision Mechanics, 1b. Key Laboratory of Space Precision Measurement Technology, Chinese Academy of Sciences, Xi’an 710119, China;
2. School of Mechanical and Electrical Engineering, Henan University of Science and Technology, Luoyang 471003, China

Received date: 2022-12-23

Revised date: 2023-01-15

Accepted date: 2023-02-15

Online published: 2023-07-14

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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Al₂O₃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Al₂O₃球形粉末的物相主要为α-Al₂O₃,喷涂后涂层中的Al₂O₃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1 000 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。

关键词： 空间导电滑环; 等离子喷涂; 铝合金; Al₂O₃; 绝缘涂层

本文引用格式

谢友金 , 李迎春 , 杨更生 , 曲昀 , 邱明 . 空间导电滑环绝缘环片等离子喷涂Al₂O₃绝缘涂层的性能研究[J]. 材料保护, 2023 , 56(6) : 39 -45 . DOI: 10.16577/j.issn.1001-1560.2023.0133

Abstract

For solving the problems of poor structural stability and machining difficulties of non-metallic insulating rings in space conductive slip rings, Al₂O₃ 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 Al₂O₃ spherical powder prepared by agglomeration sintering of original nanoparticles was α-Al₂O₃. After spraying, Al₂O₃ in the coating existed as α phase and γ phase, 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 1 000 V in atmospheric environments, which could meet the service requirements of space conductive slip ring insulating rings.

Key words： space conductive slip ring; plasma spraying; aluminium alloy; Al₂O₃; insulating coating

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