Effect of base metals and particle size of mill additive silica powder on flow resistance of ground coat glass

As factors which affect the flow resistance of ground coat glass, the type of base metal and the particle size of the silica powder which is used as m ill additive were investigated. Carbon steel (SS400), ferritic stainless st eel (SUS430) and austenitic stainless steel (SUS304) were used as base meta ls. Three types of silica powder of various average particle sizes were use d as mill additives. The following results were obtained. The glass flow de creased in the order of SS400, SUS430 and SUS304. The glass flow of SUS304 decreased to approximately one-third that of SS400. The glass flow increase d with increasing diffusion length of the Fe ion. A high-Cr-concentration l ayer existed between the ground coat layer and the base metal in the cases of SUS430 and SUS304 base metals. The glass flow decreased with increasing average particle size of the silica powder. The glass flow of the sample wi th the silica powder of 139 mum average particle size decreased to approxim ately one-third that of the sample with the silica powder of 8 mum average particle size.