公开(公告)号：US12037533B2

公开(公告)日：2024-07-16

申请号：US15733198

申请日：2018-12-10

Applicant: IMERTECH SAS

Inventor： Ertan Sahin

IPC: C09K3/14 ,  C04B35/117 ,  C04B35/626 ,  C04B35/63

CPC classification number: C09K3/1436 ,  C04B35/117 ,  C04B35/62695 ,  C04B35/6316 ,  C04B2235/3217 ,  C04B2235/3427 ,  C04B2235/349 ,  C04B2235/5436

Abstract: The present invention relates to an agglomerate abrasive grain made up of a plurality of individual abrasive grains which are bonded into an inorganic or organic binder matrix, wherein, based on the total weight of the agglomerate abrasive grain, at least 8% by weight of the abrasive grains which are bonded into the matrix are fused alumina-based polycrystalline alumina abrasive grains with a percentage of more than 97% by weight of alpha-alumina, and wherein the polycrystalline alumina abrasive grains, in turn, are made up of a plurality of Al2O3 primary crystals with a crystal size of between 20 μm and 100 μm. The agglomerate abrasive grain has a closed macroporosity with a pore volume of between 5% by volume and 30% by volume, wherein the average pore diameter of the closed macropores is between 10 μm and 100 μm and their maximum pore diameter is in the range of approx. 120 μm.