Wang Chengbiao

Recent Developments in Magnetron Sputtering

The principle of magnetron sputtering is introduced and the balanced and unbalanced magnetrons are compared and the necessity of unbalanced magnetrons is explained as well. Several recent developments in plasma magnetron sputtering, i.e., unbalanced magnetron sputtering, pulsed magnetron sputtering and ion assisted sputtering, are discussed. The recent developments of unbalanced magnetron systems and their incorporation with ion sources result in an understanding in growing importance of the magnetron sputtering technology, which makes the technology an applicable deposition process for a variety of important films, such as wear-resistant films and decorative films.

A Study on the Application of a Mineral Additive in Lubricating Oil for Cylinder Liner

Some special minerals as additives in lubricating oil have shown a certain self-repairing function for the rubbing-pairs of industrial equipment in recent R & D of extreme pressure anti-wear additives. This paper introduces an investigation on the application of a commercially available mineral additive for practical cylinder liners and gears using some advanced techniques like AFM, Nano-Hardness Tester, SEM and AES. The basic formula of the additive is Al4[Si4O10](OH)4. Through some macro and micro analyses of the practical machine parts, it was found that the mineral additive showed an obvious improved effect on their tribological performances and self-repairing function. The worn surface with some pits and cracks has been repaired to a certain degree. Furthermore, it can greatly decrease the surface roughness by several decades of nanometers, and significantly enhance the hardness of the cylinder liner and gear. The mechanism of this mineral additive was investigated, it maybe a catalyzer to promote a series of complex tribochemical reactions on the worn surface under high temperature and pressure in the friction and wear process.