磁器の材料特性に及ぼす長石質原料の影響
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概要
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The effects of feldspars incorporated as principal raw materials in the batches on the mechanical strength and thermal expansion of the hard porcelain electrical insulators were studied. The feldspars used were of four types containing sodium and potash in different proportions, and were incorporated, respectively, in different amounts in the batch of the composition which was similar to that of the ordinary hard porcelain electrical insulator. Tests were made of glazed and unglazed specimens both fired at 1350℃ for three hours in a Harop type tunnel kiln. The results obtained were: (1) For the unglazed bodies, the mechanical strength decreased with increased feldspar content, and in the case of comparatively small content of feldspar the soda-rich feldspar seemed to have somewhat superior effect in increasing the strength of bodies than the potash-rich feldspar. (2) For the glazed bodies, the type of feldspar affected the mechanical strength of bodies remarkably especially when the content of feldspar was small; the soda-rich feldspar had much more effect in increasing the strength than the potash-rich feldspar. (3) Raios of the mechanical strengthes between the glazed and the unglazed bodies of the same composition passed a maximum in every case when the content of feldspar was increased. When the content of feldspar was small, the soda-rich feldspar also had much more effect in increasing the value of this ratio than the potash-rich feldspar. The values of ratio may be used as the data for the judgement of the adaptability of glaze to to body. (4) The thermal expansion of the unglazed body decreased with increased feldspar content. The body with the soda-rich feldspar showed higher expansion than that with the potash-rich feldspar. Quarts garinz were found to change into cristobalite during firing much easier in the bodies containing the soda-rich feldspar than in those containing the potash-rich feldspar.
- 社団法人日本材料学会の論文
- 1959-02-15