Research On High Temperature Fretting Wear Of 1Cr18Ni9Ti And TiN/Ti Composite Coatings

Fretting wear is a familiar and prevalent wear form in Engineering. Fretting wear is a phenomenon that can't be avoided in the equipment of Nuclear Power. Quite a few damages in Nuclear Power Engineering correlate to fretting wear, The equipments of Nuclear Power are working in the condition of high temperature. Investigation on the high temperature fretting wear will redound to alleviate damages in the equipment of Nuclear Power, which has great important influence on the society and the economy.High temperature fretting wear behavior of 1Cr18Ni9Ti stainless steel its TiN/Ti composites were prepared by Plasma Immersion Ion Implantation and Deposition(PIII&D) have been studied by using high precision test apparatus. Various analysises, measurements of wear extent and observations of the wear scar pattern have been carried out by means of optical microscopy (OM), X-ray diffraction (XRD), laser confocal scanning microscopy (LCSM), scanning electron microscopy (SEM) and Energy dispersion spectrometer (EDS). Atomic emission spectrometry (AES),X-ray photoelectron spectrometry(XPS),The effects of displacement, normal load and temperature have been focused on. The mechanism of high temperature fretting wear is explored systematically. Main conclusions are drawn as follows:1. In slip regime and mixed regime, With the increase of the displacement and normal load, the wear volume and the friction coefficient of 1Cr18Ni9Ti stainless steel both increase. In partial slip regime, With the increase of normal load the wear extent and the friction coefficient both decrease.2. Temperature has great influence on the fretting wear. The friction coefficient and the wear volume of 1Cr18Ni9Ti stainless steel with the increase of the high temperature, In partial slip regime The friction coefficient and wear volume of TiN/Ti composition coating were almost invariant with temperature increasing.3. At 25℃, the wear mechanism of 1Cr18Ni9Ti stainless steel is delamination and abrasive wear, mainly adhesion and abrasive wear at 200℃. and 400℃; At 25℃and 200℃the wear mechanism of TiN/Ti composition coating is delamination and abrasive, and at 400℃the wear mechanism dominant is delamination, oxidation wear. At 25℃and 200℃, The friction coefficient and the wear volume of TiN/Ti composition coating are small than the 1Cr18Ni9Ti stainless steel, At 400℃, As a result of TiN/Ti composition coating wear through, The wear volume is higher than 1Cr18Ni9Ti stainless steel.4. From 25℃to 400℃, the friction coefficient of TiN/Ti composition coating is lower than that of 1Cr18Ni9Ti stainless steel; Because of high rigidity and well high temperature capability of PIII&D TiN/Ti composition coating, the wear volume of TiN/Ti composition coating is lower than that of. 1Cr18Ni9Ti stainless steel;The application of PIII&D TiN/Ti composition coating on 1 Crl 8Ni9Ti stainless steel improves the property of fretting wear resistant.