陶瓷涂层加注管接头密封性能研究

Sealing Performance of Ceramic Coating Filling Tube Connector

球锥面密封结构是航空航天及化学工业中普遍采用的密封结构,对其密封性能研究及改进具有一定的工程应用价值。球锥面加注管接头的主要材料是1Cr18Ni9Ti,当重复使用时,接触表面极易发生磨损,影响密封特性。针对上述问题,采用涂层表面处理技术,提高表面抗磨损性能和密封性能。借助ANSYS有限元软件,模拟分析了接触表面的应力分布情况。陶瓷涂层弹性模量越大,接触应力越大,密封性越好,但粘结强度较低。当涂层与基体弹性模量相接近时,粘结强度较好。因此对4种陶瓷涂层进行等离子喷涂并进行密封及磨损试验研究。结果表明:TiN涂层加注管接头黏着磨损及磨粒磨损现象有较大改善,重复使用效果最好。

Spherical cone-sealing structures are widely used in the aerospace and chemical industries, thus the research on the improvement of the structure is valuable to many engineering application. The filling tube connector, made of 1CrlSNi9Ti, is prone to abrasion that leads to seal- ing failure. In this paper, the antiwear and sealing abilities of the filling tube connector were studied after ceramic coating technique treatment. The stress distribution on the contact surface was simulated and analyzed through ANSYS software. The greater elasticity modulus of the ceramic coating led to the greater contact stress and better sealing performance while the lower bond strength. When the elastic modulus of ceramic coat- ing was close to that of the matrix, the bond strength was good. Therefore, four kinds of ceramic coatings were prepared by plasma spray and the experiments about seal and wear were carried out as well. Results revealed that TiN ceramic coating not only reduced the adhesive wear and ab- rasive wear, but also greatly extended the life of a filling tube connector.