Ceramic core for use in making molds and dies
US4139393A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 28, 1977 |
| Grant date | Feb 13, 1979 |
| Priority date | — |
| Expiry date | Apr 28, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C9/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Compacted articles, such as molds and dies, may be produced by compacting an alloy particle charge of a composition from which it is desired to make the mold and die against a ceramic core having a configuration corresponding generally to the desired configuration of the article; the ceramic core of the invention is constructed from an admixture comprising rounded refractory oxide particles and a colloidal silica as a binding agent; preferably the rounded refractory oxide particles are zircon sand. Cores in accordance with the invention are readily cast into precision shapes required for mold and die manufacture and also are easily removable from the compacted alloy such as molds or dies to expose the mold or die cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.