Title: Magnesia ceramic for insulation of high-frequency electricity

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Claims: What is claimed is:

1. A magnesia ceramic for high-frequency electric insulation, consisting essentially of magnesia as the principal component, 2.0 to 20% by weight of a calcium-magnesium-phosphate of the composition xCaO.yMgO.P.sub.2 O.sub.5, wherein, x and y each have a value falling within the range of from 0.5 to 2.5; and 0.25 to 5.0% by weight of at least one member selected from the group consisting of the oxides of aluminum, silicon, beryllium and tungsten.

2. A magnesia ceramic for high-frequency electric insulation according to claim 1, wherein the calcium-magnesium-phosphate content falls in the range of from 5 to 15% by weight and the combined content of aluminum oxide and silicon oxide falls in the range of from 0.25 to 5.0% by weight.
Other info:

Inventors: Sano, Shiro (Nagoya, JA)
Hayashi, Hiroshi (Nagoya, JA)
Takagi, Hiroyoshi (Kasugai, JA)

Application Number: 749822
Filing Date: 1976-12-13
Publication_date: 1978-04-18
Assignee: Agency of Industrial Science & Technology (Tokyo, JA)
Primary Class(es): 501/111
Other Classes:
US Patent Ref:

2479504	Aug, 1949	Moore et al.	106/58.
2571526	Oct, 1951	Bonnet	106/62.
3647488	Mar, 1972	Brigham et al.	106/58.
3752684	Aug, 1973	Kiehl et al.	106/58.
3920464	Nov, 1975	Damiano	106/58.

Other Refs:
Primary Examiner: Douglas, Winston A.
Assistant Examiner: Sheehan, John P.
Attorney: Kelman; Kurt