WC-base composite ceramic sintered compact
US6551954B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2001 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Oct 9, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T407/27
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A WC-based composite ceramics sintered body consisting of 40 volume % to 90 volume % of WC including solid-solved oxygen represented by a chemical formula of WCxOy (where 0.005<y/x+y<0.05), with the remainder being partially stabilized ZrO2 and inevitable impurities, wherein partially stabilized ZrO2 includes one or more of stabilizers selected from the group consisting of Y2O3, CeO2 and MgO. A prepared powder of raw material is held in an atmosphere containing oxygen in a temperature range of 200° C. to 600° C. for 0.1 hour to 3 hours to provide WC grains including solid-solved oxygen represented by a chemical formula of WCxOy (where 0.005<y/x+y<0.05). Partially stabilized Zro2 including one or more of stabilizers selected from the group consisting of Y2O3, CeO2 and MgO is used as a phase for filling up the grain boundary of the WC grains. A ceramic sintered body capable of sufficiently fulfilling various properties, such as of Young's modulus, hardness, heat conductivity and electrical workability, which are required as materials for sliding parts, edged tools and dies can be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.