リチアセラミックスの諸性質に及ぼすリチア含有ガラス添加の影響

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書誌事項

タイトル別名
  • Effects of Addition of Lithia Containing Glasses on the Properties of Lithia Ceramics
  • Li2O-Al2O3-SiO2ケイ セラミックス ノ ケンキュウ 1
  • Studies on the Thermal Shock Resisting Ceramics of the Li<sub>2</sub>O-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> System, I
  • Li<sub>2</sub>O-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>系セラミックスの研究 (第1報)

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抄録

Powdered frits of lithia containing glasses were added as the binding agent in a total amount of 5-20% to finely divided natural petalite (Li2O⋅Al2O3⋅8SiO2). The compositions of glasses were 4-18 Li2O, 4-21 Al2O3, 52-86 SiO2 and 5-25% (wt) (MgO+ZrO2+P2O5). The mixtures were ball-milled to a finess smaller than 200 mesh, dry pressed under pressure of 900kg/cm2 with an addition of 0.05% PVA, formed into bars of 5×5×50mm, and fired at a temperature 1080°-1320°C until the mixture sintered to an apparent porosity of about zero.<br>The results showed that the addition of the glasses produces profound effects in (a) increasing the firing range or the interval between the sintering temperature and the sagging temperature, (b) increasing the modulus of rupture of the sintered bodies, and (c) improving their thermal shock resistance.<br>Among the glasses tested the one having the composition, 10.7Li2O, 8.9MgO, 8.9Al2O3, 71.5% (wt) SiO2, showed the best results: The firing range was increased from-20°C for the body of 100% petalite ((-) means that the sagging temperature is lower than the sintering temperature and (+) the reversed case) to +40°C for the body containing 10 weight percent of the above glass. The strength of the sintered body was increased by 100%. The specimen of the above size withstood repeated quenchings from 1000°C into cold water without showing cracking or spalling.<br>In place of natural petalite, the other lithia containing minerals such as eucryptite (Li2O⋅Al2O3⋅2SiO2) and spodumen (Li2O⋅Al2O3⋅4SiO2) were used as the principal raw materials to be added with the lithia containing glass but without obtaining good results in regard to firing range and thermal shock resistance.

収録刊行物

  • 窯業協會誌

    窯業協會誌 70 (793), 102-110, 1962

    公益社団法人 日本セラミックス協会

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