Showa Denko K.k.

Tetsuo Hatanaka

Tadashi Hiraiwa

Mitsuru Hasegawa

Norimichi Aoki

Shoichi Imai

Minoru Matsukura

An abrasive grain for use as a grinding material comprising alpha-alumina crystal particles substantially smaller than 0.5 microns, solidly dissolved with at least one of Ti, Mn, V, Ga, Zn and Rh, and with an a-axis length of the hexagonal unit cell of the alpha-Al.sub.2 O.sub.3 from 4.75892 to 4.76340 angstroms when measured by a powder X-ray diffraction method, and a density of more than 90% of the theoretical value, and an abrasive grain for a grinding material, comprising alpha-alumina crystal particles substantially less than 0.5 microns, solidly dissolved with at least one of Mg, Ni and Co, and with an a-axis length of the hexagonal unit cell of the alpha-Al.sub.2 O.sub.3 from 4.75930 to 4.76340 .ANG. when measured by a powder X-ray diffraction method, and a density of more than 90% of the theoretical value, and further, a grinding wheel and coated cloth manufactured from these abrasive grains.

Abrasive grain and manufacture for the same

Alumina-based ceramics materials, abrasive materials and method for the

An abrasive grain for use as a grinding material characterized by alpha-corundum crystal particles substantially smaller than 0.5 micron, solidly dissolved with at least one element out of Ti, Mn, V, Ga, Zn and Rh, and with an a-axis length of the hexagonal unit cell of the alpha-Al.sub.2 O.sub.3 at 4.75892 to 4.76340 angstrom when measured by a powder X-ray diffraction method, and a density of more than 90% of the theoretical value, and an abrasive grain for a grinding material, characterized by alpha-corundum crystal particles substantially less than 0.5 micron, solidly dissolved with at least one element out of Mg, Ni and Co, and with an a-axis length of the hexagonal unit cell of the alpha-Al.sub.2 O.sub.3 at 4.75930 to 4.76340 A when measured by a powder X-ray diffraction method, and a density of more than 90% of the theoretical value, and further, a grindstone and grinding cloth manufactured that these abrasive grains.

Abrasive grain and method for manufacturing the same

Growing community of inventors

Shiojiri, Japan

Tetsuo Hatanaka