| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to an abrasive instrument, containing melted grains. Abrasive grains have a chemical composition in wt % based on oxides: AlOremaining part to 100%, ZrO+HfO16-24%, MgO in such amount that a weight ratio (ZrO+HfO)/MgO constitutes from 25 to 65, oxides different from AlO, ZrO, HfOand MgO 0-2%.EFFECT: invention makes it possible to obtain grains with improved properties with a lower content of zirconium dioxide, and therefore reduce the production cost.12 cl, 1 tbl |
