Complex ceramic and metallic shaped by low pressure forming and sublimative drying
US5047182A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1991 |
| Grant date | Sep 10, 1991 |
| Priority date | — |
| Expiry date | Mar 7, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F2998/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for forming articles from inorganic sinterable particulates includes providing a well-dispersed, low pressure injectable slurry, freeze-forming the slurry into a desired geometry, and drying the piece so formed by a predominantly sublimative process, to produce a green article that can be conventionally sintered. The vehicle has a volume change on freezing of not more than .+-.10% by volume; to further control the volume change on freezing, an emulsion derived from different vehicles can be tailored. The slurries preferably have a solids content of at least about 35 v/o, a viscosity of preferably not more than about 1000 cP at 100 s.sup.-1, and are preferably injectable at not more than about 1000 psi, usually at less than 100 psi.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.