Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making composite or hollow article
Patent
1987-05-15
1987-12-15
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making composite or hollow article
419 9, 419 19, 419 43, 419 53, 419 54, 419 57, 419 58, 264125, 264 60, 264 65, B22F 700
Patent
active
047132159
ABSTRACT:
The powdered material contains oxygen in the oxide and/or adsorbed form and the oxygen present is reduced in a first pre-sintering stage and the cohesion of the material is ensured in a second sintering stage. The pre-sintering stage is carried out under a reducing atmosphere based on hydrogen and neutral gas whose flow rate F.sub.G is higher than or equal to: ##EQU1## in which relation: S.sub.P =section of the layer of powder to be sintered in sq.m
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L'Air Liquide
Lechert Jr. Stephen J.
Robinson, Jr. Lee C.
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