Patent
Glazed ceramic substrate
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TLDR
In this paper, a SiO2-Al203-CaO-alkali metal oxide type glass film of a specified compsn on an insulating ceramics substrate is described.Abstract:
PURPOSE:To provide the title substrate with good surface smoothness, good electrical charcteristics, improved heat and acid resistances for electronic parts by covering a SiO2-Al203-CaO-alkali metal oxide type glass film of a specified compsn on an insulating ceramics substrate CONSTITUTION:A glass film consisting of, by wt, SiO2 70-85%, Al2O3 7-17%, CaO 05-5% and one or more kinds of alkali metal oxides 5-15% is formed on an insulating ceramics substrate by a usual method A glass thin film formed on a conventional glazed ceramics substrate has a softening point of about 600-800 degC, and the highest service temp is about 700 degC in practical use The glass film of this invention withstands heat of temps as high as 950-1050 degC, and the acid resistance is 20-50% higher than that of the conventional film with respect to solubility in a mixed soln of hydrofluoric acid/nitric acid=1/1read more
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