Patent ID: 11952316
Assignee: SHINKO ELECTRIC INDUSTRIES CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC C  H  B | IPC B  C  H

Claim 18:
19. A composite green sheet comprising:
an unfired green sheet made of a ceramic powder including 96 mass % or more aluminum oxide; and
an unfired metal film, formed of a metal selected from a group consisting of aluminum, aluminum alloys, copper, and copper alloys, and having a first surface in contact with the green sheet made of ceramic powder, and a second surface on an opposite side from the first surface and exposed to an outside,
wherein the metal film has a melting point, and the green sheet made of ceramic powder exhibits a relative density of approximately 90% or higher after firing at a firing temperature higher than or equal to the melting point, such that the composite green sheet exhibits:
a decrease in a volume of the green sheet when fired at the firing temperature that depends on the metal forming the metal film and falls within a range higher than or equal to 700° C. and lower than or equal to 1600° C.,
substantially no change in a volume of the metal film when fired at the firing temperature,
melting and solidifying of the metal film when fired at the firing temperature,
no chemical reaction of the green sheet made of ceramic powder with the metal forming the metal film progressing when fired at the firing temperature, and
substantially no inclusion of the metal film when the melting and solidifying of the metal film are exhibited.