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US 6,635,841 B2Granted
Metal-ceramic composite and vacuum switch unit using the same
AssigneeNgk Spark Plug Co., Ltd.
InventorYusuke Makino
Life of this patent
Estimating the term…
Abstract
A metal-ceramic composite is provided in which a solder layer and a ceramic member are held in contact with each other at an annular area extending along an entire circumference of an axial end surface of the ceramic member and having an average width W (mm), and in which the average width W and an outer diameter D (mm) of the ceramic member satisfy D≧30 and (⅙)×D≧W≧(D/30)+2.6.
Claims7
A metal-ceramic composite comprising:
- a hollow, cylindrical ceramic member having an axial end surface;
- a metallic member having a flat plate portion extending along an entire circumference of the axial end surface of the ceramic member, the metallic member being disposed so that a main surface of the plate portion is positioned opposite to the axial end surface of the ceramic member;
- and
- a joining metal layer interposed between the main surface of the metallic member and the axial end surface of the ceramic member and joining the metallic member and the ceramic member together so as to form a butt seal structure;
- wherein the joining metal layer and the ceramic member are in contact with each other at an annular area extending circumferentially of the axial end surface of the ceramic member and having an average width W (mm);
- and
- wherein the average width W and an outer diameter D (mm) of the ceramic member satisfy:
- D≧30;
- and
- (⅙)×D≧W≧(D/30)+2.6.
7 more elements
Dependencies are inferred from the claim text.