Method of manufacturing an object of a powdered material by isos

Details Method of manufacturing an object of a powdered material by isos Method of manufacturing an object of a powdered material by isos

1984-02-07

1986-02-04

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Post sintering operation

419 23, 419 31, 419 35, 419 39, 419 42, 419 44, 419 45, 419 49, 419 54, 419 55, 419 57, 419 68, 291568B, 29 235, 75228, 75244, 264 62, 264332, 416241R, 416241B, 428698, 428704, 501 96, B22F 300

Patent

active

045685169

ABSTRACT:
An object is manufactured from a powdered material by isostatic pressing of a body, preformed from the powdered material, with a pressure medium, whereby the preformed body, in which at least the surface layer consists of a ceramic material in the form of a nitride, is surrounded by a casing which is rendered impenetrable to the pressure medium, before the isostatic pressing is carried out and the powder sintered. As the material in the casing there is used boron oxide or a glass containing boron oxide or a material forming glass while being heated, in which the content of boron oxide is sufficiently high for the glass--or the glass formed during heating--to be removable by water. The preformed body surrounded by the casing is subjected to a heat treatment for the formation of boron nitride on the surface of the preformed body, before the isostatic pressing is carried out. The casing is removed from the finished product by means of water or water vapor.

REFERENCES:
patent: 4081272 (1978-03-01), Adlerborn
patent: 4478789 (1984-10-01), Adlerborn et al.
patent: 4499048 (1985-02-01), Hanejko

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