Method for fabricating shaped monolithic ceramics
US6407022B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1999 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Apr 21, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249957
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The process of the present invention comprises a method for fabricating shaped monolithic ceramics and ceramic composites through displacive compensation of porosity, and ceramics and composites made thereby. The method of the present invention includes three basic steps:1) Synthesis or other acquisition of a porous preform: A porous preform with an appropriate composition, pore fraction, and overall shape is prepared or obtained. The pore fraction of the preform is tailored so that the reaction-induced increase in solid volume can compensate partially or completely for such porosity. It will be understood that the porous preform need only be sufficiently dimensionally stable to resist the capillary action of the infiltrated liquid reactant;2) Infiltration: The porous preform is infiltrated with a liquid reactant; and3) Reaction: The liquid reactant is allowed to react partially or completely with the solid preform to produce a dense, shaped body containing desired ceramic phase(s).The reaction in step 3) above is a displacement reaction of the following general type between a liquid species, M(l), and a solid preform comprising the compound, NBXC(s):AM(l)+NBXC(s)=AMXC/A(s)+BN(l/g)…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.