Boron carbide-copper cermets and method for making same
US5145504A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1991 |
| Grant date | Sep 8, 1992 |
| Priority date | — |
| Expiry date | Jul 8, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/00931
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Ceramic metal compositions are described that include a ceramic phase content of at least 60 percent by volume of said composition and a copper metal phase permeating the ceramic phase. The resulting composition is substantially fully densified, having a connected or isolated ceramic grain structure, preferably of fine B.sub.4 C grains of less than 3 micrometers. Flexure strength and fracture toughness for 80 volume percent B.sub.4 C-20 volume percent Cu cermets are 6.62 MPa.multidot.m1/2 and 725 MPa, respectively. The process of the invention includes as a key element, contacting a porous article of ceramic phase with copper metal followed by heating to above melting and subjecting said article to pressure of at least 200 MPa, such that the porous body is filled with metal and the composition is substantially fully densified.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.