Casting core composition
US5612393A · kind A · utility
4Cited by
4References
6Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Apr 24, 1996 |
| Grant date | Mar 18, 1997 |
| Priority date | — |
| Expiry date | Apr 24, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C1/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a casting core composition including refractory mullite grains and 1.0-2.2 wt % of a phenolic resin for binding the mullite grains. The mullite grains are substantially spherical in shape and have a special grain size distribution. That is, the mullite grains contain first to eighth fractions. These fractions respectively have first to eighth diameters which are respectively within ranges of larger than 420 .mu.m, 297-420 .mu.m 210-297 .mu.m, 149-210 .mu.m, 105-149 .mu.m, 74-105 .mu.m, 53-74 .mu.m, and smaller than 53 .mu.m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.