Wear Property and Friction Mechanism Study of Ceramic Side Dam Used in Thin Strip Continuous Casting
Twin roller continuous casting, a sort of near-net-shape technology, presents numerous advantages on economical production of thin strips,such as low energy consumption, low equipment and operating costs, and rapid solidification.In the process of twin roller continuous casting, the side dams in contact with the rollers act as indispensible roles on keeping molten metal from leakage in whole casting process.During casting process,molten metal is frequently dumped into pool region surrounded by rollers and dams, and along with rolls rotating to drag metal strips.So side dams have to suffer extremely tough working conditions,such as iterative thermal impact (especially more than 1000 ℃ for steel and iron), heavy abrasion against rolls and strips at high temperature, as well as erosion from different molten metals.For the side dam, it is necessary to have good combinations of properties including excellent mechanical properties and thermal properties.In this paper,based on three different kinds of ceramic side dam,the friction and wear property were studied.The effects of friction pressure, temperature and friction time on the friction and wear property of ceramic side dam were researched.Whats more, the friction and wear mechanism of the ceramic side dam were researched as well.Results show that the ceramic side dam of BN-Sialon has the best wear resistance property.At room temperature, friction time is 16 min and friction pressure is 0.35 MPa, the test friction coefficient is 0.70 and wear rate is 240.506 mm3.In addition, when the temperature is 400 ℃,friction time is 16 min and friction pressure is 0.18 MPa, the test friction coefficient is 0.70 and wear rate is 62.669 mm3.The friction mechanism of ceramic side dam opposite wear material is mainly the composite wear of adhesion wear, abrasive wear and fatigue wear.
thin strip continuous casting ceramic side dam wear force friction coefficient microstrueture
LIU Meng SONG Yijie LIU Jixiong XU Guotao CHEN Huasheng
Research and Development Centre of Wuhan Iron and Steel (Group) Corporation,Wuhan 430080,China
国际会议
西安
英文
1-5
2016-09-20（万方平台首次上网日期，不代表论文的发表时间）