Investigation of tribological and corrosion properties in ceramic/PTFE coating
Da Bian, Jiahong Li, Zhao Yongwu, Wang Yongguang
Abstract
Tribological and corrosion properties of chemically bonded ceramic coating (CBC) is limited due to the porous structure. To overcome the limitation, polytetrafluoroethylene (PTFE) is infiltrated into CBC by vacuum impregnation, and the related tribological and corrosion properties are investigated. CBC with the infiltration of PTFE (CBC/PTFE) shows a lower coefficient of friction than CBC because a transfer lubricant film is formed due to PTFE. In addition, the wear resistance is also improved with the infiltration of PTFE. Besides, CBC/PTFE possesses a better corrosion resistance attributing to the excellent hydrophobicity of PTFE and the compact layer caused by the filling of PTFE into the pores of CBC.