Patent ID: 8894730

Claim:
An alumina sintered compact containing a titanium compound and an iron compound, wherein: a total amount of a TiO 2 -equivalent content of the titanium compound, a Fe 2 O 3 -equivalent content of the iron compound and the alumina content is at least 98% by mass, a total amount of the 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 a ratio by mass of the TiO 2 -equivalent content of the titanium compound to the Fe 2 O 3 -equivalent content of the iron compound (TiO 2 /Fe 2 O 3 ) is from 0.85/1.15 to 1.15/0.85, wherein the alumina sintered compact comprises main crystal phases, each of the main crystal phases is composed of a corundum crystal and a FeTiAlO 5 grain exists in a grain boundary of each of the main crystal phases.