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首页> 外文期刊>Boletin de la Sociedad Espanola de Ceramica y Vidrio >Influence of alumina characteristics on glaze properties
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Influence of alumina characteristics on glaze properties

机译：氧化铝特性对釉料性能的影响

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摘要

Aluminium oxide is a synthetic raw material manufactured from bauxite by the Bayer process, whose Al_2O_3 content typically exceeds 99%. Four main types of alumina can be defined, depending on the processing used: hydrargillite Al(OH)_3 boehmite AlOOH, transition aluminas (calcined at low temperatures, 1000 °C, with an intermediary crystallographic structure between hydrates and alpha alumina), and á-Al_2O_3 (calcined at high temperatures, >1100 °C). In glaze manufacturing, á-Al_2O_3 is the main type of alumina used. This raw material acts as a matting agent: the matt effect depends on alumina particle size and content in the glaze. This study examines the effect of the degree of alumina calcination on glaze technical and aesthetic properties. For this purpose, aluminas with different degrees of calcination were added to a glaze formulated with a transparent frit and kaolin, in order to simplify the system to be studied. The results show that, depending on the degree of calcination, alumina particles can react with the glaze components (SiO_2, CaO, and ZnO) to form new crystalline phases (anorthite and gahnite). Both crystallisations extract CaO and ZnO from the glassy phase, increasing glassy phase viscosity. The variation in crystalline phases and glassy phase viscosity yields glazes with different technical and aesthetic properties.
机译：氧化铝是铝土矿通过拜耳法生产的合成原料，其Al_2O_3含量通常超过99％。根据所使用的工艺，可以定义四种主要类型的氧化铝：水铝石Al（OH）_3勃姆石AlOOH，过渡氧化铝（在低温，1000°C下煅烧，在水合物和α氧化铝之间具有中间晶体结构）和á -Al_2O_3（在高于1100°C的高温下煅烧）。在釉料生产中，á-Al_2O_3是所用氧化铝的主要类型。该原料用作消光剂：消光效果取决于氧化铝的粒径和釉料的含量。本研究考察了氧化铝煅烧程度对釉料技术和美学性能的影响。为此，将具有不同煅烧度的氧化铝添加到由透明玻璃料和高岭土配制的釉料中，以简化要研究的体系。结果表明，根据煅烧程度，氧化铝颗粒可以与釉料成分（SiO_2，CaO和ZnO）反应形成新的结晶相（钙长石和钠长石）。两种结晶都从玻璃相中提取CaO和ZnO，从而增加玻璃相粘度。晶相和玻璃相粘度的变化产生具有不同技术和美学特性的釉料。

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