一种低温无硼无铅生料乳浊釉的研究

研究了一种无硼无铅生料乳浊釉,并讨论了影响乳浊度的一些因素     

一种低温无硼无铅生料乳浊釉的研究

研究了一种无硼无铅生料乳浊釉，并讨论了影响乳浊度的一些因素。     

半熔块磷锆乳浊釉用于卫生陶瓷的研究

作者设计了一种适用于卫生瓷的半熔块磷锆乳浊釉,它与当前国内多数卫生瓷厂采用的锆系生料乳浊釉相比具有锆英砂用量较少、可采用较粗的锆英砂且乳浊能力较强、熔融温度和高温粘度较低、釉面质量好等优点,适用于低温快速烧成。作者采用常用方法研究了该釉的主要工艺参数,采用XRD和SEM对该种釉的乳浊机理进行了初步研究。     

分相乳浊釉的研究现状与发展趋势

无乳浊剂的分相乳浊釉是业内当前的研究热点.本文简述了分相乳浊釉的定义与机理,介绍了分相乳浊釉的研究现状,重点介绍了各种分相乳浊釉的特点、性能、乳浊机理和不同组分对乳浊效果的影响.最后分析了分相乳浊釉存在的主要问题,并指出了其今后的研究方向.     

磷乳浊釉的研究

本文对Na2 O -K2 O -CaO -MgO -Al2 O3 -SiO2 -P2 O5系统釉进行了较全面的正交试验研究 ,找到了影响该系统釉乳浊及釉面质量的主次因素 ,获得了性能良好的乳浊釉及其最佳乳浊釉配方。借助SEM分析 ,研究了该系统乳浊釉主要乳浊相。     

PDZ替代锆英粉用做瓷釉乳浊剂的研究

本论文研究在乳浊釉中利用超细ＰＤＺ原料替代超细锆英粉用作乳浊剂的工艺。试验确定了适合乳浊釉的ＰＤＺ用量及比较合理的釉料配方。测试研究了ＰＤＺ乳浊釉和锆英石乳浊釉的白度、耐磨性、热稳定性等性能。采用Ｘ－射线衍射和扫描电镜两种手段研究了ＰＤＺ乳浊釉和锆英粉乳浊釉的物相组成和显微结构,并对ＰＤＺ乳浊机理进行了理论分析。结果表明,两者乳浊机理基本相同,但两者析出的锆英石晶相的形貌和分布状态存在差别。     

钛釉的性质及乳浊机理

由于钛釉价格低,制成的乳浊釉遮盖能力极强,已经受到了人们的高度重视。主要介绍了钛釉的主要性质及其乳浊机理,以便人们对其进行更进一步的研究。     

制备锆乳浊陶瓷釉的正交试验研究

以锆英石为乳浊剂,对影响乳浊釉制备的石英、钾长石、锆英石、苏州土用量4因素进行了正交试验研究,获得了性能良好的乳浊釉配方,通过SEM分析,研究了乳浊釉主要的乳浊相。     

钛釉的性质及乳浊机理

由于钛釉价格低,制成的乳浊釉遮盖能力极强,已经受到了人们的高度重视。本文主要介绍了钛釉的主要性质及其乳浊机理,以便人们对其进行更深一步的研究。     

影响低温釉性质因素的探讨

由予能源的短缺和环保的要求，陶瓷行业的低温釉正成为研究的热点。但是含铅的低温釉不但其研磨硬度较差．而且铅含量高影响环保，因此应开发兼顾节能、耐磨和环保性能的新型陶瓷低温釉。本文使用硼和锶为添加剂．成功地制备了无铅低温釉，对釉的性质进行了测试与分析。     

LOW-LEAD,BRIGHT OPAQUE GLAZES AT CONES 08 TO 06*

This investigation covered several systematic fields of opaque fritted glazes for cones 08 to 06 (1733° to 1841°F.) in which lead oxide was replaced by barium, strontium, and zinc oxides. All glaze ingredients except the kaolin and the Ultrox zirconium opacifier were incorporated in the frits. Glazes of low-lead content as well as some lead-free compositions were obtained which possessed excellent gloss and opacity on wall tile of low and of medium tale content. Barium oxide was the best substitute for lead oxide from the standpoint of gloss, although moderate amounts of strontium and zinc oxides can be used to advantage. The whitest and most opaque glazes were obtained with the use of zinc oxide.     

Development of spinel opaque glazes for ceramic tiles

The feasibility of developing fast-firing opaque wall tile glazes obtained from zircon-free frits was studied. The structural and morphological characteristics of the glazes were determined by differential scanning calorimetry, an optical dilatometer, X-ray diffraction and scanning electron microscopy. The studied glaze was characterized by a high whiteness value L* greater than 94, very low values of a* and b* which is about ?0.65 and 0.01, respectively, and a high gloss value above 98%. The opaque effect is due to the presence of spinel crystals with a size range of 0.2–1.0 μm, which is formed by devitrification during fast-firing. The Vickers micro-hardness of the studied glaze is higher than the one of the commercial zircon based glass-ceramic glazes. This type of frit can be an alternative one for fabricating opaque ceramic glazes.     

Compositional modifications to floor tile glazes opacified with zircon

Abstract

In the ceramic tile industry opaque glazes with considerable zircon content are widely used. However, the high cost of zircon limits its wide use in relevant glaze compositions. In the present study, a model opaque glaze was modified by changing the alumina/silica ratio, adding potassium oxide, or using a higher content of opaque frit while gradually eliminating the zircon content in the glaze batch. After glaze preparation, application, and single firing of glazed floor tiles under industrial conditions glazes were characterised by XRD, SEM, and EDX. The optimum alumina/silica ratio was found to be 0·26. Colour parameters L, a, and b of starting and final glazes showed that an increase in opaque frit content gives more positive improvement in opacity and in dry abrasion resistance than potassium oxide addition. Removal of zircon from the glazes resulted in a decrease of ～13–18% in glaze cost without detrimental effect on opacity.     

自生分相乳浊釉的研究进展

对含磷与硼的自生分相乳浊釉的乳浊机理进行了分别概述,并简要介绍了这两种自生分相乳浊釉的研究进展,对分相乳浊釉良好的应用前景做了展望。     

卫生瓷激光补釉用低温无铅无镉釉料的研究

研究了用激光局部成釉修复卫生瓷表面缺陷及使用的低温无铅镉熔块釉组成、制备工艺和性质。     

Zircon-free frits suitable for single fast-firing opaque wall tile glazes and their industrial productions

Wall tile glazes with a smooth surface texture, high glossiness, and whiteness are usually based on zirconium containing frits. However, these frits are quite expensive and therefore, there have recently been certain attempts to lower the production cost such as taking suitable glass–ceramic glaze systems into an account. With the present work, the frit-based glaze compositions belonging to the K₂O–MgO–CaO–ZnO–Al₂O₃–B₂O₃–SiO₂ glass–ceramic system were studied to prepare newly synthesized wall tile glazes for industrial single fast-firing. The design of a glass–ceramic glaze for this type of tiles should ensure that the selected frit precursor is technically and commercially compatible with the manufacturing conditions generally used in the production of glazed ceramic wall tiles. The aim of the study is to develop zircon-free, frit-based, glossy opaque glass–ceramic glazes for wall tiles by optimizing the CaO/MgO and adjusting the Al₂O₃/alkali ratios in the starting frit compositions. Frit production, glaze preparation, application, and single fast-firing of wall tiles were, first of all, conducted under laboratory working conditions and then, successful recipes were adapted to the relevant industry. The frit crystallization capability and crystallization temperature range were determined by differential thermal analysis (DTA). Thermal expansion coefficient values of glazes were determined by a dilatometer. Characterization of single fast-fired glass–ceramic glazes was made by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) techniques. Colour and gloss analyses of the final glazes were measured with a spectrophotometer and a gloss meter, respectively.     

Li_2O-Na_2O-B_2O_3-SiO_2系无铅低温透明熔块的研制

探索用"Li2O-Na2O-B2O3-SiO2"新的配方系统配制无铅低温透明熔块的方法。制得使用温度为740~780℃的低温无铅透明熔块,以熔块配制成的低温透明熔块釉可作为生产陶瓷装饰色料中的低温熔剂。     

Development of sapphirine opaque glazes for ceramic tiles

The purpose of this work is to produce more excellent opaque wall tile glazes by using sapphirine instead of zirconium silicate as an opacifier. In order to achieve it, the chemical compositions were precisely adjusted in the system of SiO₂-Al₂O₃-MgO-K₂O-Na₂O-B₂O₃. The morphological characteristics of the glaze were determined by differential scanning calorimetry (DSC), X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). And the optical properties of the glaze were characterized by a spectrophotometer and a gloss meter. The results reveal that well-shaped crystals of sapphirine (Mg₂Al₄SiO₁₀) with needle-like morphology were formed as only crystal phase. The glaze is provided with better opacity whiteness and gloss compared with commercial zircon-based glass-ceramic glazes, and it is mainly composed of cheap mineral raw materials. Those features make it as an alternative one for improving the properties of conventional opaque ceramic glazes.     

Characterization of Rice Husk Ash and Its Recycling as Quartz Substitute for the Production of Ceramic Glazes

In this work a complete characterization of rice husk ash (RHA) was conducted in order to evaluate mainly the composition and the thermal reactivity in terms of crystalline phase evolution. Moreover, the screening results of the research conducted on the possibility to use RHA as silica precursor in ceramic materials, such as ceramic glazes, were reported. The selected frits were prepared in a semiindustrial furnace and the obtained glasses were investigated in comparison with the frits prepared from pure quartz. Besides, laboratory glazes were obtained and characterized following the technical rules. This work allows to confirm the possibility to use RHA as silica precursor for the development of glazes for ceramic tile. The results evidenced, however, that it is not possible for a generalized production substitution of quartz with RHA.