Room and elevated temperature sliding wear behavior of cold sprayed Ni-WC composite coatings

SURFACE & COATINGS TECHNOLOGY

卷:350

Article; Proceedings Paper

Torgerson, T. B.¹  Harris, M. D.¹  Alidokht, S. A.²  Scharf, T. W.¹  Aouadi, S. M.¹  Chromik, R. R.²  Zabinski, J. S.³  Voevodin, A. A.¹ 

[1] Univ North Texas, Adv Mat & Mfg Proc Inst, Mat Sci & Engn Dept, Denton, TX 76203 USA

[2] McGill Univ, Mat Engn Dept, Montreal, PQ H3A 0C5, Canada

[3] Army Res Lab, Aberdeen Proving Ground, MD 21005 USA

关键词: Cold spray;    Metal matrix composite;    Dry sliding wear;    Elevated temperature;    Oxidative wear;   

DOI  :  10.1016/j.surfcoat.2018.05.090

来源: Elsevier

【 摘 要 】

The tribological properties of cold sprayed Ni-WC metal matrix composite (MMC) coatings were investigated under dry sliding conditions from room temperature (RT) up to 400 degrees C, and during thermal cycling to explore their temperature adaptive friction and wear behavior. Characterization of worn surfaces was conducted using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and Raman spectroscopy to determine the chemical and microstructural evolution during friction testing. Data provided insights into tribo-oxide formation mechanisms controlling friction and wear. It was determined that the steady-state coefficient of friction (CoF) decreased from 0.41 at RT to 0.32 at 400 degrees C, while the wear rate increased from 0.5 x 10(-4) mm(3)/N.m at RT to 3.7 x 10(-4) mm(3)/N.m at 400 degrees C. The friction reduction is attributed primarily to the tribochemical formation of lubricious NiO on both the wear track and transfer film adhered to the counterface. The increase in wear is due to a combination of thermal softening of the coating and a change in the wear mechanism from adhesive to more abrasive. In addition, the coating exhibited low friction behavior during thermal cycling by restoring the lubricious NiO phase inside the wear track at high temperature intervals. Therefore, cold sprayed Ni-WC coatings are potential candidates for elevated temperature and thermally self-adaptive sliding wear applications.

【 授权许可】

Free