Method of manufacturing an object of a powdered material by isostatic pressing
US4568516A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1984 |
| Grant date | Feb 4, 1986 |
| Priority date | — |
| Expiry date | Feb 7, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49325
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.