Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Heat and pressure simultaneously to effect sintering
Patent
1988-12-16
1989-11-28
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Heat and pressure simultaneously to effect sintering
264 65, 419 38, 419 39, B22F 100
Patent
active
048836397
ABSTRACT:
An object is manufactured of a powdered material by isostatic pressing of a body (10), preformed from the powdered material, whereby the preformed body is surrounded by a casing (16) which at least for the main part is transferred to molten phase, before the isostatic pressing is carried out while sintering the powder. As material in the casing there is used glass or a material forming glass when being heated and containing 48-52 percent by weight B.sub.2 O.sub.3, 46-50 percent by weight SiO.sub.2 and 1.5-2.5 percent by weight Al.sub.2 O.sub.3. It can be removed from the finished object by water or water vapor and has a low coefficient of thermal expansion at temperatures below the melting temperature of the glass. To counteract the penetration of molten glass from the casing into the preformed body, a barrier layer (18) may be arranged on the preformed body inside the casing. (FIG. 3)
REFERENCES:
patent: 4478789 (1984-10-01), Adlerborn et al.
patent: 4568516 (1986-02-01), Adlerborn et al.
patent: 4601877 (1986-07-01), Fujii et al.
Adlerborn Jan
Larker Hans
Nilsson Jan
ABB Cerama AB
Lechert Jr. Stephen J.
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