Alumina sintered compact and method of producing the same, and article for heat treatment using alumina sintered compact
AssigneeMurata Manufacturing Co., Ltd.
InventorsKoichiro Hirako, Kenji Ueno, Tomonobu Suzuki
Life of this patent
Estimating the term…
Abstract
An alumina sintered compact includes at least two layers including an internal layer and a surface layer formed on the surface of the internal layer, which internal layer is composed of alumina crystal grains formed by sintering of a fine alumina powder, and which surface layer is composed of alumina crystal grains formed by grain growth of a fine alumina powder and having a mean grain size larger than that of the alumina crystal grains of the internal layer. This alumina sintered compact can prevent the accumulation of PbO in a surface area while controlling the absorption of PbO.
Claims12
An alumina sintered compact comprising an internal layer and a surface layer on the surface of said internal layer, said internal layer comprising alumina crystal grains of sintered fine alumina powder and said surface layer comprising alumina crystal grains of grain grown fine alumina powder, wherein the mean grain size of said alumina crystal grains of the surface layer is larger than that of said alumina crystal grains of the internal layer.
Dependencies are inferred from the claim text.