公开(公告)号：WO1997000836A1

公开(公告)日：1997-01-09

申请号：PCT/US1996006857

申请日：1996-05-14

Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY

Inventor： MINNESOTA MINING AND MANUFACTURING COMPANY ,  MONROE, Larry, D. ,  ERICKSON, Dwight, D. ,  WILSON, David, M. ,  WOOD, Thomas, E.

IPC: C04B35/111

CPC classification number: C04B35/1115 ,  C09K3/1409

Abstract: Alpha alumina-based ceramic abrasive grain comprising, on a theoretical oxide basis, Al2O3, Fe2O3, and SiO2. The abrasive grain has a surface roughness height of greater than about 200 nanometers and a density of greater than about 3.50 g/cm . Preferably, the alpha alumina-based ceramic abrasive grain has alpha alumina crystallites having an average crystallite size of less than about 0.5 micrometer (more preferably, less than about 0.3 micrometer). The presence of the SiO2 in combination with Fe2O3 increases the amount of transgranular fracture of the abrasive grain, reduces the alpha alumina crystallite growth during sintering of the abrasive grain, dilates at least one of the unit cell dimensions of the abrasive grain, and generally improves the grinding performance of the abrasive grain. In another aspect, a method for making alpha alumina-based ceramic abrasive grain comprising on a theoretical oxide basis, Al2O3, and SiO2 is disclosed.

Abstract translation: α氧化铝基陶瓷磨粒，其以理论氧化物为基础，包括Al 2 O 3，Fe 2 O 3和SiO 2。 磨粒具有大于约200纳米的表面粗糙度高度和大于约3.50g / cm 3的密度。 优选地，α氧化铝基陶瓷磨粒具有平均微晶尺寸小于约0.5微米（更优选小于约0.3微米）的α氧化铝微晶。 SiO 2与Fe 2 O的组合的存在增加了磨粒的晶粒间断裂的量，减少了磨粒的烧结期间的α氧化铝微晶生长，使磨粒的单元电池尺寸中的至少一个扩大，并且通常改善 研磨性能的磨粒。 另一方面，公开了一种制造基于理论氧化物的基于Al2O3和SiO2的α氧化铝基陶瓷磨粒的方法。