Composite materials are composed of a primary metallic base material, such as a titanium metallic material, metallurgically bonded to one or more secondary materials having desirable thermal conductivity properties and having a coefficient of thermal expansion ("CTE") that generally matches the CTE of the primary metallic material. An exemplary composite material is composed of a titanium primary material metallurgically bonded to a secondary metal matrix composite material having a high thermal conductivity, such as aluminum silicon carbide. Methods for manufacturing such composite materials are disclosed.
A hermetically sealed package for electronic circuit components includes a generally hollow, titanium body, having a reduced thickness bottom wall/floor, whose interior surface is laminated with a relatively low mass, insert, upon which electronic circuit components are mounted. The insert has a high thermal conductivity and a low coefficient of thermal expansion, approximate to that of the housing body.
Methods and apparatus for hermetically sealing an optical fiber in a feedthrough connection. In brief overview, the optical fiber is mounted in a housing whose physical properties differ from that of the fiber by utilizing a structure in accordance with the present invention. The structure, typically in transition bushing form, is formed from at least two materials, such that the physical properties of a first material are selected to match the physical properties of the optical fiber, and the physical properties of a second material are selected to match physical properties of the housing. When the matched physical properties are the coefficients of thermal expansion (CTE) of the fiber and the housing, the result is a fiber optic mounting that remains hermetically sealed despite changes in ambient temperature that would typically induce stresses in the seal, potentially causing its failure.
A radiator plate includes a metallic matrix and a dispersant. The metallic matrix exhibits a predetermined coefficient of thermal expansion. The dispersant is dispersed in the metallic matrix, and exhibits a coefficient of thermal expansion being smaller than that of the metallic matrix. The radiator plate has a heat-receiving surface, on which an electric device serving as a heat generator is disposed, and a heat-radiating surface for radiating heat received from the heat-receiving surface. The dispersant is dispersed more on the heat-receiving-surface side than on the heat-radiating-surface side. Thus, the radiator plate is inhibited from warping, and is good in terms of the dimensional stability as a final product. Moreover, the thermal resistance is diminished between the heat-receiving surface and the heat-radiating surface. Accordingly, the heat-radiating ability of the radiator plate is secured. Also disclosed is a process for manufacturing the radiator plate.
First, a melt of Al or a melt of an Al alloy containing Si is injected in a die filled with SiC powder and cast to form a plate member made of an Al/SiC composite. Next, an Al foil member made of an Al--Mg-based alloy is joined with the surface of the plate member through hot pressing. As a result, part of the Al foil member enters casting blowholes on the surface of the plate member to fill the casting blowholes. In addition, an Al--Mg-based alloy layer is formed on the surface of the plate member. Thus, a base plate having a nearly flat surface is produced.
