Abstract
The results of the researches about the relation between the contents of the three constituents, ZrO2, K2O, and MoO3, in the frit for flame spraying of vitreous enamel, and the resistability to acid as well as the coefficient of thermal expansion are as follows;
(1) There exists a definite relation between the amount of the frit dissolved and the concentration of hydrochloric acid used.
(2) The resistibility to acid is simply and rapidly determined by titration.
(3) The addition of ZrO2 does not deteriorate the resistability to acid.
(4) MoO3 seems to have a special effect on the coefficient of thermal expansion. The addition of even a small amount of MoO3 makes it twice as large as those of ZrO2 and K2O systems, but further addition of MoO3 doesn't make any difference in the value of the coefficient.
(5) By the addition of MoO3, the softening begins at about 200°C.
