To produce an enameled substrate from the crystallized glass not contg. bubbles and excellent in smoothness by depositing a glass powder on a metallic substrate and heating the powder at a specified temp. to melt it.
The powder of the crystallized glass consisting of Bad, MgO, B2O3, Sin2, Al2O3, SnO2, P2O5, etc., is deposited on the surface of a metallic substrate at 10-20mg/cm2, for example. The powder is then heated between the softening temp. tsof the glass and the precipitation tamp. T1 of a first crystal phase (2MgO.B2O3) to melt the powder. The powder is then heated at a temp. higher than the precipitation temp. T1 and lower than the maximum temp. Tmax which is lower than the precipitation temp. T2 of a second crystal phase (BaO.2MgO.SiO2), i.e., T1≤Tmax<T2, to precipitate only the first crystal phase in the molten-glass coating layer. An enameled substrate from the crystallized glass free of surface cracks is stably produced in this way.
NAKAMURA MASAHIKO
HIROSE EIICHIRO
SHINOHARA YOSHINORI
