ABRASIVE GRAINS CONSISTING OF POLYCRYSTALLINE ALUM

专利名称：ABRASIVE GRAINS CONSISTING OF

POLYCRYSTALLINE ALUMINA

发明人：ALARY, JEAN-ANDRE申请号：EP00903755.7申请日：20000209公开号：EP1157077B1公开日：20020814

摘要：The invention concerns an abrasive grain based on electromelted aluminaconsisting of crystals with a hexagonal structure, of size less than 100 νm, and preferablyless than 30 νm, and more preferably less than 5 νm, with density higher than 97 %,preferably 98 %, of the theoretical density of alumina, and a Knoop hardness higher than2000. The invention also concerns a method for making abrasive grains based on aluminaconsisting in melting alumina, casting it at a constant flow rate less than 80 kg/mn, andcooling it by dispersing the melted alumina in fine droplets to obtain articles with sizeless than 1 mm. Said dispersion is preferably performed by ultrasound-assisted spraying,at a frequency ranging between 15 and 50 MHz. The inventive grains are used inparticular for making grindstones.

申请人：PEM ABRASIFS-REFRACTAIRES,PEM ABRASIFS REFRACTAIRES,PEM ABRASIFS-REFRACTAIRES

地址：FR

国籍：FR

代理机构：Mougeot, Jean-Claude

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