| With the application of high load,high sliding velocity,high temperature,extreme low temperature and high frequency vibration severe service conditions in the aviation, aerospace, defense, nuclear industry and other fields becomes more and more frequently,the wear of sealing,bearing caused by impact-sliding motion is becoming a growing problem. In order to improve the life and reliability of bearings, bearing steel magnetron sputtering DLC and Mo S2 solid film as a bearing surface modification technology has been widely used in the aerospace field. In order to make the solid film in bearing steel surface work under severe service properly, it is necessary to study its impact- sliding friction characteristics. In this paper,we have used the method of experiment, testing,theoretical analysis to research on the impact-sliding friction characteristics of solid lubricating films on G95Cr18 steel surface.Firstly, we designed a impact-sliding wearing test rig which work under the atmospheric,it uses the ring-to-block friction pair.and we completed the construction of the sensing detection system.We used the high-speed cameras to do a movie about entire process of impact of the impact-sliding wearing test rig,research the dynamic response of specimens in the whole process of impact.The greater the impact force,the shorter the contact time. First,the kinetic energy of impact piece causes the instantaneous deformation of the impacted test piece.Then,after it recovers, the impacted test piece deforms under the sustainable force.And we analyzed the absorption rule of impact energy in the entire contact process.Then,researched the impact-sliding wear characteristics of DLC and Mo S2 solid film on G95Cr18 steel surface under atmospheric conditions by experiment. Its surface nano hardness, elastic modulus, film thickness and intrinsic mechanical properties was obtained by analyzing membrane mechanics and composition of DLC and Mo S2 solid film.We analyzed the wear and tear form under different service conditions by spectroscopy, scanning electron microscopy and other testing methods to get the wear mechanism of DLC and Mo S2 solid film.In order to search the the impact-sliding wear characteristics of DLC and Mo S2 solid film in a vacuum environment,we design an impact-sliding test rig in the thermal vacuum system of the lab. It uses the ring-to-block friction pair.The impact force and impact frequency of the rig is adjustable,it can get a long stable output.All the parameters display,store automatically.For its simple structure,it is easy to assemble and disassemble. And researched the impact-sliding wear characteristics of DLC and Mo S2 solid film on G95Cr18 steel surface in a vacuum environment by experiment.In the end,in order to research the interface mechanics characteristic of coating-subrate system,we built a coating-substrate system model using mathematical formulations according to the real structure of friction pair.While the interface mechanics characteristics of G95Cr18 steel magnetron sputtering DLC and Mo S2 solid film were analysed and evaluated theoretically,we gained the interface stress and deformation of coating-substrate system during impact and impact-sliding cantact model.Combined with result of the experiments we get a better explain of the wear mechanisn about DLC and Mo S2 solid film. |
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