| abstract |
A method for manufacturing an alumina sintered body, according to the present invention, includes the steps of (a) obtaining a compact by putting a slurry containing an Al 2 O 3 powder, a MgO powder, a MgF 2 powder, a solvent, a dispersing agent, and a gelatinizer into a mold, gelatinizing the slurry by a chemical reaction of the gelatinizer in the mold, and causing mold release, (b) obtaining a calcined body by drying the compact, performing degreasing, and further performing calcination, and (c) obtaining a ceramic sintered body by subjecting the calcined body to hot-press firing at 1,150° C. to 1,350° C. In the step (a), the Al 2 O 3 powder having a purity of 99.9 percent by mass or more is used and 0.1 to 0.2 parts by mass of MgO powder and 0.13 parts by mass or less of MgF 2 powder relative to 100 parts by mass of Al 2 O 3 powder are used. |