SiO_2-ZrO_2-Na_2O多孔質ガラス担体の生成機構

概要

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The formation process of porous glass supports in a SiO_2-ZrO_2-Na_2O system was investigated. The porous glass supports were prepared by impregnation of NaCl into a microspherical SiO_2-ZrO_2 gel, heating the mixture at temperatures ranging from 760 to 800℃, and washing it with water. Scanning electron microscope (SEM) observations indicated that porous glass skeletons were formed through sintering of the gel even before removal of NaCl, with the porosity of the gel partially retained. Heat treatment at a temperature higher than 760℃ enhanced diffusion of sodium cations in the microspherical gel, which resulted in their homogeneous distribution. It was also confirmed that HCl was formed during reaction of the SiO_2-ZrO_2 gel and NaCl. Therefore, a liquid phase in a SiO_2-ZrO_2-Na_2O system was probably formed through ion exchange between sodium cations and protons of hydroxy groups on the SiO_2-ZrO_2 gel, and the gel was partially sintered to form the porous glass supports.
社団法人日本セラミックス協会の論文
1997-06-01