Patent · US Expired

Method for manufacturing an object of silicon nitride

US4256688A · kind A · utility

14Cited by
6References
1Claims
0Family size

Assignee

Inventors

Key dates

Filing dateAug 28, 1979
Grant dateMar 17, 1981
Priority date
Expiry dateAug 28, 1999

Classification

  • Technology area (CPC B)Performing Operations; Transporting
  • CPC primaryB22F3/1208
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

Disclosed is an improved method for manufacturing an object of silicon nitride. In the method, a body preformed from silicon nitride powder and enclosed in a casing of glass is isostatically pressed with a gaseous pressure medium in a pressure vessel at a temperature required for sintering of silicon nitride. After pressing and sintering are completed, the pressure and the temperature in the pressure vessel are adjusted such that the temperature maintains the glass in a plastic state and the pressure in the pressure vessel is below the partial pressure of nitrogen gas for silicon nitride at that temperature so that the glass casing is blown up around the body and the body is freed from or can easily be freed from the glass casing.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.