硅橡胶与金属黏附效应的产生与影响分析

为探讨橡胶密封件与金属法兰之间的黏附效应产生的原因及黏附效应对密封的影响,根据硅橡胶密封结构的使用特点,设计硅橡胶密封圈与金属法兰在不同温度、不同时间下的黏附实验.通过硅橡胶密封圈与防锈铝合金和2种不锈钢材料的对比实验发现,硅橡胶密封圈与不锈钢金属法兰易发生黏附,与防锈铝合金金属法兰不易发生黏附.通过对金属法兰表面接触...

Analysis on Generation and Effect of Adhesion Between Silicon Rubber and Metal

In order to explore the causes of adhesion between rubber seal and metal flange and the influence of adhesion on sealing,according to the use characteristics of silicone rubber sealing structure,adhesion experiments between the silicon rubber sealing ring and the metal flange at different temperatures and times were designed.Through the comparative experiments of silicon rubber sealing ring with anti-rust aluminum alloy and two kinds of stainless steel materials,it is found that the silicone rubber sealing ring is prone to adhere to the stainless steel flange and is not prone to adhere to the anti-rust aluminum alloy metal flange.By testing the contact angle of metal flange surface,it is concluded that the greater the surface energy and the thinner the oxide layer,the easier the adhesion occurs.It is shown that the adhesion of silicone rubber seal ring in long-term contact with metal flange is caused by the existence of chemical bond between the interface,and this chemical reaction intensifies with the increase of time at a certain temperature.The results of mechanical analysis on sealing structure and sealing ring leakage test show that the static sealing performance of the sealing structure will not change whether adhesion occurs or not.