To reduce a manufacturing cost of a composite material with high thermal-conductivity, which is formed by combining a sintered plate of an aluminum powder with a fibrous carbon material, by reducing the amount of the fibrous carbon material to be used therein while securing a high mechanical strength so as to be used for a thermal diffusion plate for cooling an element, which serves as an element mounting portion, and also maintaining superior thermal conductivity.
This composite material includes: a tabular base metal 22 which is formed of a sintered compact of a pure aluminum powder or an aluminum alloy powder; and a tabular high-thermal-conductivity portion 23 which is buried in a middle part in the plate thickness direction of the tabular base metal 22 and in a part of planar regions perpendicular to the plate thickness direction. The tabular high-thermal-conductivity portion 23 is a stacked body of: a sintered compact layer of an aluminum powder; and a fiber-oriented sheet which is formed of a fibrous carbon material and has the fibers oriented in a specific one direction parallel to the surface of the sheet. This composite material is manufactured with a two-step sintering method which includes: a first sintering step of forming the tabular high-thermal-conductivity portion 23; and a second sintering step of burying a tabular composite material that has been manufactured beforehand, in the aluminum powder, compressing the powder in the plate thickness direction, and sintering the aluminum powder.
COPYRIGHT: (C)2011,JPO&INPIT
IMANISHI TERUMITSU
SHIMIZU AKIYUKI
SATO YASUHIKO
KAKITSUJI ATSUSHI
OSAKA PREFECTURE
| JPH08503023A | 1996-04-02 | |||
| JP2009013475A | 2009-01-22 | |||
| JPH07269312A | 1995-10-17 |