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    • 22. 发明申请
    • Abrasive grains consisting of polycrystalline alumina
    • 磨粒由多晶氧化铝组成
    • US20040093804A1
    • 2004-05-20
    • US10614235
    • 2003-07-08
    • PEM ABRASIFS-REFRACTAIRES
    • Jean-Andre Alary
    • C01F007/02C09K003/14
    • C09K3/1427C01F7/027C01P2004/04C01P2004/22C01P2004/34C01P2004/38C01P2004/61
    • The invention relates to an abrasive grain containing electro-fused alumina, formed of crystals of hexagonal structure less than 100 nullm in size, preferably less than 30 nullm, and further preferably less than 5 nullm, having a density that is greater than 97%, preferably 98%, of the theoretical density of alumina and a Knoop hardness of more than 2000. A further purpose of the invention is a method for producing abrasive grains containing alumina, comprising melting of the alumina, its casting at a constant flow rate of less than 80 kg/min, and its cooling by dispersion of the molten alumina in fine droplets to give particles with a size of less than 1 mm. This dispersion is, preferably, conducted by ultrasound-assisted atomization using a frequency of between 15 and 50 MHz. The abrasive grains of the invention are used in particular to produce grindwheels.
    • 本发明涉及一种包含电熔氧化铝的磨料颗粒,该颗粒由密度大于97%的小于100μm,优选小于30μm,进一步优选小于5μm的六方结构的晶体形成, 优选98%的氧化铝的理论密度和超过2000°的诺普硬度。本发明的另一个目的是生产含有氧化铝的磨料颗粒的方法,其包括将氧化铝熔融,其铸件以恒定的流速少 超过80kg / min,并且通过将熔融氧化铝分散在细小液滴中而冷却,得到尺寸小于1mm的颗粒。 优选通过使用15至50MHz的频率的超声辅助雾化来进行该分散。 本发明的磨粒特别用于生产磨轮。
    • 30. 发明授权
    • Semicontinuous process for producing oxide refractory material having fine crystal structure
    • 用于生产具有精细晶体结构的氧化物耐火材料的半连续工艺
    • US3928515A
    • 1975-12-23
    • US15331871
    • 1971-06-15
    • CARBORUNDUM CO
    • RICHMOND WESLEY QCICHY PAUL
    • C04B35/653C09K3/14B22D23/08
    • C04B35/653C09K3/1427
    • Oxide refractory materials (for example, alumina-zirconia mixtures) can be cast by a semicontinuous process to have an extremely fine crystal structure, by casting a melt of the oxide refractory materials onto a non-reactive, non-melting particulate solid cooling media of a material other than that of the oxide refractory material (for example, steel spheres having a size ranging from about 5 to about 60 mm), additional cooling media being added to the solidification chamber while the oxide refractory melt is cast onto the cooling media. The melt is then cast upon the additional cooling media, until the solidification chamber is nearly filled with both oxide refractory material and cooling media. The solidified material, when crushed and graded, has exceptional utility as an extremely tough abrasive grain.
    • 氧化物耐火材料(例如,氧化铝 - 氧化锆混合物)可以通过半连续工艺铸造以具有非常精细的晶体结构,通过将氧化物耐火材料的熔体浇铸到非反应性,非熔化的颗粒状固体冷却介质 除了氧化物耐火材料(例如,尺寸范围为约5至约60mm的钢球)以外的材料,在将氧化物耐火材料熔体浇铸到冷却介质上时,将另外的冷却介质加入到凝固室中。 然后将熔体浇铸在附加的冷却介质上,直到凝固室几乎充满氧化物耐火材料和冷却介质。 当被压碎和分级时,固化的材料作为非常坚硬的磨粒具有特殊的用途。