Method for producing zirconia-reinforced alumina grains, in particular abrasive grains, and grains produced by such method

摘要

Method for producing zirconia-reinforced Al2O3 grains, including at least the following steps: inductively melting a starting mixture to form a eutectic melt made of alumina and zirconia; applying the eutectic melt as a thin layer material, the thin layer material being quenched; and removing the thin layer material. In this manner abrasive grains can be formed directly or the thin layer material can be classified when it is broken into abrasive grains, the grains are polycrystalline without amorphous glass phases as an alumina matrix having zirconia precipitations, and at least some of the zirconia precipitations can be formed in the nanoscale range.

主权项

1. Method for producing polycrystalline zirconia-reinforced alumina (Al2O3) grains, comprising at least the following steps:
a) inductively melting a solid starting mixture to form a eutectic melt composed of alumina and zirconia; b) applying the eutectic melt as a thin layer material having a layer thickness with quenching of the thin layer material; c) removing the thin layer material as grains; d) the grains being polycrystalline, formed without amorphous glass phases, and having an alumina matrix containing zirconia precipitates; and e) at least a portion of the zirconia precipitates are segregated in the nanoscale range, with greater than 50% of the zirconia precipitates having diameters less than 100 nm.