Composite alumina/metal powders, cermets made from said powders,

Details Composite alumina/metal powders, cermets made from said powders, Composite alumina/metal powders, cermets made from said powders,

1994-05-24

1995-10-31

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501153, 501152, 75232, 75245, 75246, 4285395, C04B 35117

Patent

active

054629039

ABSTRACT:
The invention relates to nano-composite powders of alumina and metal constituted of grains of micronic size. Each grain comprises a compact matrix of alumina of a specific surface area less than 5 m.sup.2 /g, in which are dispersed crystallites of transition metals of alloys of these metals, of sizes less than 50 nm. The powder according to the invention may be produced starting with a precursor comprised of a mixed carboxylic salt of aluminum and one or more transition metals. The powders according to the invention permit producing by sintering cermets of alumina/metal benefitting from greatly improved mechanical and thermo-mechanical properties.

REFERENCES:
patent: 4743511 (1988-05-01), Sowman et al.
patent: 4961902 (1990-10-01), Clere et al.

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