Glass-ceramic product

Details Glass-ceramic product Glass-ceramic product

1983-11-15

1985-09-10

Czaja, Donald

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

65 33, 264 60, C03C 322, C03B 3200, C04B 3334

Patent

active

045406715

ABSTRACT:
A glass-ceramic product is disclosed. The glass product is produced by combining 0.1 to 6 wt % of a compound selected from the group consisting of B.sub.2 O.sub.3 and P.sub.2 O.sub.5 with a mixture. The mixture includes 54 to 63 wt % SiO.sub.2, 20 to 28 wt % Al.sub.2 O.sub.3, 10 to 18 wt % MgO and 2 to 6 wt % ZnO. From the combined compound and mixture are formed a glassy material and then glassy material is ground in order to form a frit. The frit is then molded and the molded frit is fired into a crystalline form. The resulting glass-ceramic product has a low permittivity as compared with alumina and low power factor tan .delta.. Further, the product has a coefficient of thermal expansion which is comparable with the value for silicon semiconductor chips. The product also has other desirable characteristics such as its firing and crystallizing temperature, moisture absorption and mechanical strength.

REFERENCES:
patent: 3597305 (1971-08-01), Giffen
patent: 3669715 (1972-06-01), Meyer
patent: 3673049 (1972-06-01), Giffen

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