リシア雲母組成ガラスの結晶化に及ぼすジルコニアの影響

概要

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The effect of zirconia on crystallization of glasses with lepidolite composition and properties of glass ceramics obtained have been investigated. The batches of 7LiF・15KF・28Al_2O_3 50SiO_2 (wt%) were melted at 1500℃ for 10 min and the melts were quenched by pressing the melt with platinum plate. The obtained glasses were heated at a constant heating rate, and the precipitated crystals were found to be lepidolite and p eucryptite by X-ray diffraction analysis. The crystaniza tion temperatures of lepidolite and β-eucryptite were 600 and 800℃, respectively at the heating rate of 10℃ min^<-1. However, in order to precipitate the lepidolite in the glass containing no ZrO_2 by isothermal heat treatment, the crystanization of lepidolite required heating the glass at 500℃ for more than lh. One per cent ZrO_2 was sufficient for the crystallization of lepidolite. The activation energy for crystal growth of the glass was 268 kJ/mol. The thermal conductivity of glass ceramics heated at 500℃ for lh and then 800℃ for 2h was 0.033 W/cm ℃, which was larger than lepidolite glass ceramics, and its thermal expansion coefficient and dielectric properties were similar to those of lepidolite glass ceramics.
社団法人日本セラミックス協会の論文
1994-04-01