Abrasive products containing fused alumina zirconia and reduced titania
US5143522A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1988 |
| Grant date | Sep 1, 1992 |
| Priority date | — |
| Expiry date | Nov 29, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K3/1427
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An abrasive grain comprising about 20 to about 50% by weight of zirconia; reduced titania in an amount on analysis expressed as titanium dioxide of 1.5 to about 10% by weight; total carbon in an amount of 0.03 to about 0.5% by weight; impurities, if any, in a total amount on analysis expressed as the oxides of not greater than 3% by weight; and a balance of alumina. The microstructure of the abrasive grain comprises primary alumina or zirconia crystals embedded in a supporting alumina-zirconia eutectic matrix. The grain may be produced by combining and melting the alumina and zirconia; adding titania and carbon (excess carbon being required); melting and reducing the titania under reducing furnace conditions; and solidifying the melt in under three minutes by means of a suitable heat sink material. The abrasive grain has a high proportion of tetragonal zirconia and may be used to produce coated abrasive products or bonded abrasive products.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.