Sintering of Pollucite Using Amorphous Powder and Its Low Thermal Expansion Property

[出版社版]rights: 社団法人日本セラミックス協会 rights: 本文データは学協会の許諾に基づきCiNiiから複製したものである relation: isVersionOf: http://ci.nii.ac.jp/naid/110002292057/Calcined powders were prepared for sintering of cubic Cs_<0.9>Al_<0.9>Si_<2.1>O_6 by calcining a mixture of Al_2O_3/SiO_2 fine powder and CsNO_3 powder at temperatures of 798 to 1123 K for 20 h in air. The amorphous phase produced in the case of a lower calcination temperature, while the crystallinity of the calcined powder increased with increasing calcination temperature. Densification of the Cs_<0.9>Al_<0.9>Si_<2.1>O_6 green body was significantly enhanced using the amorphous calcined powder. The relative density of the Cs_<0.9>Al_<0.9>Si_<2.1>O_6 sintered body reached 94.5% when the green body of the amorphous calcined powder, including a slight amount of CsNO_3, was sintered at 1673 K for 20 h in air. The dense cubic Cs_<0.9>Al_<0.9>Si_<2.1>O_6 sintered body showed linear thermal expansion without hysteresis, resulting in a thermal expansion rate of ca. 0.13% at 1273 K