PORCELAIN GLAZE Russian patent published in 1994 - IPC

FIELD: manufacture of fine bodies. SUBSTANCE: the glaze comprises (wt % ): 60-70 silicon oxide; 12.0-13.0 aluminium oxide; 0.2-0.3 ferric oxide; 0.1-0.2 titanium oxide; 6.3-6.8 calcium oxide; 1.3-3.3 magnesium oxide; 1.0-1.5 potassium oxide; 1.0-1.3 sodium oxide; 4.0-5.0 boron oxide; and 1.9-2.4 calcium nitride, the ratio of the components B₂O₃ and Ca₃N₂ 2.1 ± 0.04: 1. The glaze characteristics: the microhardness (9,0-9,5)·10^-3 MPa, the thermal resistance 15-20 thermal cycles; the luster 52% . EFFECT: improved properties of the porcelain glaze. 14 cl, 2 tbl