To further study the fretting wear of of claddings with the change of oxidation time in practical service,a variety of pre-oxidized claddings were prepared by superheated steam oxidation.In this study,a self-made high-temperature and high-pressure tangential fretting wear tester was used to carry out fretting wear tests simulating the operation conditions of PWR,and the volume wear coefficients of the substrate and the cladding after pre-oxidation at different times were measured.The results show that the surface hardness of the cladding is 2～3 times higher than that of the substrate,and the wear coefficient is reduced by about 90％.A dense oxide layer formed on the surface layer of cladding is an important reason for the change in its wear coefficient.The longer the oxidation time,the thicker the oxide layer,and the cladding with an oxidation time of 200 d has the lowest wear coefficient.In addition,the existence of oxide layer causes the fretting wear mechanism of zircaloy cladding to change from serious abrasive wear and layering to slight abrasive wear and adhesive wear in high temperature and high pressure water environment.
Pre-oxidationZircaloyHigh temperature and high pressure waterFretting wear
维普
万方数据
