Reaction sintered zirconium carbide/tungsten composite bodies and a method for producing the same
US7648675B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Oct 6, 2006 |
| Grant date | Jan 19, 2010 |
| Priority date | — |
| Expiry date | Aug 31, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C32/0052
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of sintering a composite body characterized by a transition metal carbide phase (such as a ZrC phase) substantially evenly distributed in a second, typically refractory, transition metal (such as W) matrix at ambient pressures, including blending a first predetermined amount of first transition metal oxide powder (such as ZrO2) with a second predetermined amount of second transition metal carbide powder (such as WC powder). Next the blended powders are mixed to yield a substantially homogeneous powder mixture and a portion of the substantially homogeneous powder mixture is formed into a green body. The body is fired to a first temperature, wherein the first transition metal oxide is substantially reduced and the simultaneously generated CO and gas are evolved from the body to substantially eliminate oxides from the green body, and the body is heated to a second temperature and sintered to yield a composite body of about 99 percent theoretical density and characterized by a first transition metal carbide phase distributed substantially evenly in a second transition metal matrix.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.