Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1991-10-09
1994-09-27
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
264 58, 432258, 432259, C04B 3564, F27D 500, F27B 914
Patent
active
053505514
ABSTRACT:
A ceramic firing method particularly suitable for the fabrication of metallic oxide varistor bodies containing a major proportion of zinc oxide and a minor proportion of antimony oxide. Should moldings of this composition be fired in direct contact with a conventional molding stand, antimony oxide would diffuse readily into the stand, with the consequent creation of varistor bodies that are unsatisfactory in their surge withstanding capability. Therefore, in order to avoid such effluence of antimony oxide or like diffusible metallic oxide, the moldings are fired on a diffusion retarder which preferably is of substantially the same composition as the moldings, only with a higher proportion of the diffusible substance. The diffusion retarder may take the form of either flat overlays or loose particles of sintered ceramic material, both placed on the conventional molding stand.
REFERENCES:
patent: 2867888 (1959-01-01), Schaefer
patent: 4564489 (1986-01-01), Welzen
patent: 4715812 (1987-12-01), Matuschka
Derrington James
Sanken Electric Co. Ltd.
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