Alumina abrasive grains and method for manufacturing the same
US4252544A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 9, 1979 |
| Grant date | Feb 24, 1981 |
| Priority date | — |
| Expiry date | May 9, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K3/1436
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Alumina abrasive grains having a density of more than 3.75 g/cm.sup.3 and a hardness (Knoop) higher than 1,900 Kg/mm.sup.2 are disclosed as useful in manufacturing a grinding wheel with which sharp grinding is carried out under heavy loads. The grains are characterized in that the grain structure thereof is constructed of electrofused or high temperature calcined alumina coarse crystal particles and alumina fine crystal particles which are located between said alumina coarse crystal particles, the latter having particle sizes smaller than that of the former and being processed at a calcination temperature lower than that of the former, wherein said fine crystal particles are sintered integrally with said coarse crystal particles. The method of making the grains is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.