摘要
绝缘轴承可靠性主要依赖于其表面涂层的绝缘性能,但克服绝缘涂层寿命短、耐候性差等问题一直是我国研究的前沿、热点和难点,至今尚未得到有效解决。采用超音速等离子喷涂技术在GCr15基体上制备氧化铝绝缘涂层,以Ni/Al作为粘结层,并考察了绝缘涂层的形貌、相结构、力学性能及绝缘性能。结果表明:所制备的涂层表面致密,孔隙率为3.90%;涂层相组成为γ-Al2O3和α-Al2O3;涂层的平均硬度972 HV9.8 N,抗拉强度为36 MPa,抗热震试验后涂层无明显变化,抗热震性能较好;介电常数和介电损耗随着温度的升高而升高,同时绝缘电阻值降低;随着湿度的增加,击穿电压值减小,在相对湿度达到90%时,击穿电压仍能保持在2.52 kV,绝缘性能良好。
The reliability of insulation bearings is mainly dependent on the insulation performance of the surface coating.However,the problems like short life and poor weather ability of insulating coating have not been effectively solved,which have always been the leading edge,hotspot and difficulty of scientific research in China.In this paper,Al2O3 insulating coatings were prepared on GCr15 steel using supersonic plasma spraying method with Ni/Al as bonding layer,and the morphology,phase structure,mechanical properties and insulation performance of the prepared coating were analyzed.Results showed that the obtained coating possessed a dense surface with porosity of 3.90%,and the phase compositions wereγ-Al2O3 andα-Al2O3.The average hardness was 972 HV9.8 N and the tensile strength was 36 MPa.Moreover,the coating had no obvious change after the thermal shock test,presenting good thermal shock resistance.With the increase of temperature,the dielectric constant and dielectric loss were improved,and meanwhile the insulation resistance value decreased.With the increase of humidity,the breakdown voltage was reduced.When the relative humidity reached 90%,the breakdown voltage could still be maintained at 2.52 kV,which indicated the coating possessed excellent insulation performance.
作者
张斌
张向军
林丽
马庆超
高建华
ZHANG Bin;ZHANG Xiang-jun;LIN Li;MA Qing-chao;GAO Jian-hua(Tianjin Research Institute for Advanced Equipment,Tsinghua University,Tianjin300300,China;State Key Laboratory of Tribology,Tsinghua University,Beijing100084,China;School of Mechanical Engineering and Automation,Tianjin Vocational University,Tianjin300410,China)
出处
《材料保护》
CAS
CSCD
北大核心
2019年第9期83-87,共5页
Materials Protection
关键词
AL2O3涂层
力学性能
绝缘性能
超音速等离子喷涂
孔隙率
抗拉强度
绝缘电阻
击穿电压
Al2O3 coating
mechanical properties
insulation performance
supersonic plasma spraying
porosity
tensile strength
insulation resistance
breakdown voltage
作者简介
通信作者:张向军(1968-),博士,副研究员,主要从事微纳米摩擦学与界面流变学、机械系统的润滑与检测的研究工作,电话:022-84819325,E-mail:zhangxj@tsinghua-tj.org
