Making hot pressed silicon nitride by use of low density reaction bonded body
US5302328A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1983 |
| Grant date | Apr 12, 1994 |
| Priority date | — |
| Expiry date | Jul 19, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB30B11/001
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method is disclosed of fully densifying a plurality of preformed ceramic plates by axial compression of the billets along a wall defining a cylinder and cavity. A series of the plates are stacked along the wall with the smallest dimension of the billets aligned with the axis of the cavity. The billets have a ratio of the smallest dimension to the largest dimension in the range of 1:3 to 1:40. The largest dimension of each of the plates is less than the lateral dimension of the cavity to leave an annular space; the space is filled with a pseudo isostatic pressing medium. The assembly is hot pressed under sufficient pressure and heat to convert the plates to billets of substantially full density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.