Alumina sintered body, abrasive grains, and grindstone
Provided are an alumina sintered compact containing a titanium compound and an iron compound, wherein FeTiAlO 5 grains exist in the grain boundary of the alumina grains and the mean grain size of the FeTiAlO 5 grains is from 3.4 to 7.0 μm; and an abrasive grain and a grain stone using the alumina sintered compact.
1. An alumina sintered compact containing a titanium compound and an iron compound, wherein FeTiAlO 5 grains exist in the grain boundary of the alumina grains and the mean grain size of the FeTiAlO 5 grains is from 3.4 to 7.0 μm,
wherein the total amount of TiO 2 -equivalent content of the titanium compound and the Fe 2 O 3 -equivalent content of the iron compound is from 5 to 13% by mass; and
the ratio by mass of the TiO 2 -equivalent content to the Fe 2 O 3 -equivalent content (TiO 2 :Fe 2 O 3 ) is from 0.85:1.15 to 1.15:0.85.
2. An abrasive grain comprising the alumina sintered compact of claim 1 .
3. A grind stone having a layer of the abrasive grains of claim 2 as the working face thereof.