Abstract
Mechanical coating technique (MCT) as a novel film formation process has been proposed and developed based on mechanical frictional wear and impacts among Al_2O_3 balls, columns, disks used as the substrates, and metal powder particles used as the coating metal in the bowl of planetary ball mill or pot mill. Metal films of Ti, Cu, Ni, Fe and Zn on alumina balls were prepared by MCT. Further, 2-stap MCT was developed based on MCT concept for preparing TiO_2/Ti composite films on alumina balls. The investigations for the formation process of the metal films and the applications of MCT are also promoted. Also, Al_2O_3 balls, ZrO_2 balls and steel balls have been used the substrates in MCT. In this work, stainless steel balls were used as the substrates for Ti films in MCT. The formation process of the Ti films was investigated and discussed. The formation process of Ti films on stainless steel balls is similar to that using Al_2O_3 balls or steel balls as the substrates, including the nucleation by adhesion, the formation and coalescence of discrete islands, formation and thickening of continuous coatings, exfoliation of continuous coatings.
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