Exothermically sintered homogeneous composite and fabrication me

Details Exothermically sintered homogeneous composite and fabrication me Exothermically sintered homogeneous composite and fabrication me

1998-05-19

2000-08-01

Mai, Ngoclan

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75235, 75236, 75247, 75249, 419 12, 419 13, 419 14, 419 19, 419 45, 419 47, B22F 312

Patent

active

060961112

ABSTRACT:
A homogeneous sintered composite made by press-forming a homogeneous mixture of powders of an agglutinating component, a second component having a melting point higher then the agglutinating component, and an exothermically reactive component to form a compact; heating the compact, then inducing an exothermic reaction of the reactive substance which generates sufficient additional heat to melt the agglutinating component without melting the high melting point component. For electronic microcircuit heat-dissipation applications the agglutinating component is a high thermal conductivity metal, and the high melting point component has a low thermal expansivity, whose proportions are adjusted to match the thermal expansion characteristics of microcircuit material. To reduce porosity, the reacted compact is pressed again while the agglutinating component is still in the liquid phase. For low weight applications the second material has high specific thermal conductivity. For filtration media applications, the reacted compact is allowed to cool with or without pressing, leaving a porous final composite. For corrosion resistant media, the agglutinating component is a low refractory metal, and the second material is a refractory metal oxide, carbide or boride.

REFERENCES:
patent: 4954170 (1990-09-01), Fey et al.
patent: 4961778 (1990-10-01), Pyzik et al.
patent: 5413751 (1995-05-01), Polese et al.

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