Method for making porous, crushable core having a porous integral outer barrier layer having a density gradient therein
US4221748A · kind A · utility
23Cited by
4References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1979 |
| Grant date | Sep 9, 1980 |
| Priority date | — |
| Expiry date | Jan 25, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D27/045
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for simultaneously forming an integral porous outer barrier layer having a density gradient therein on selected external surfaces of a fired ceramic article and for increasing the porosity content and crushability characteristics thereof embodies the firing of a ceramic compact comprising a reactant fugitive filler material and a ceramic material in a controlled atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.