澳洲锂辉石在陶瓷釉料中的应用

本文介绍了澳洲锂辉石的特性及其在陶瓷釉料中的作用、机理及使用方法,并对使用澳洲锂辉石所产生的经济效益进行了分析。     

锂辉石对陶瓷色料发色的影响

本文通过在低温无铅釉中添加不同比例锂辉石,探讨了陶瓷釉料中锂辉石含量对各种陶瓷色料呈色的影响。     

陶瓷色料在锂辉石釉中的应用试验

采用在低温无铅釉中添加不同比例锂辉石的方法,结合淄博福禄公司的釉用色料,探讨了陶瓷釉料中不同锂辉石含量对各种陶瓷色料呈色的影响。     

锂辉石应用试验

本文介绍了利用新疆锂辉石代替部分长石研制卫生瓷釉料的试验过程，通过试验和生产证明在卫生瓷釉料中应用锂辉石是可行的。在1220～240℃烧成条件下，锂辉石用量控制在3～6％为宜，这样获得的釉料具有烧成范围宽、热膨胀系数小、坯釉结合性能好、强度高等特点。     

包裹法国红色料在陶瓷领域应用的探索

探索包裹法国红色料在建筑陶瓷工业釉料、坯体中应用的工艺技术条件，采用正交实验方法找出包裹法国红色料在陶瓷釉料、外墙砖、地砖中的最佳发色条件：在釉料中一价的钾、钠离子特别利于该色料的发色；二价离子钡较好、钙次之、镁最差；法国红色料在普通熔块中发色不理想，在特制的熔块中发色良好。     

陶瓷墨水的最新发展趋势

本文介绍了陶瓷墨水的研究状态及未来的发展趋势。着重介绍了具有特殊装饰效果的功能陶瓷墨水和水性陶瓷墨水,并讨论了其相关性能及研究要点。实践经验证明,功能性陶瓷墨水和釉料墨水必将成为陶瓷墨水的发展方向,但这些产品的功能要想发挥出来,还需要技术人员在产品的开发过程中解决以下几个问题:稳定的釉料配方,对釉料的物理化学性质及制备工艺过程进行严格的控制;选择合适的分散体系来稳定分散釉料,提高墨水悬浮稳定性能。这样才能保证陶瓷墨水在陶瓷装饰中灵活的应用,让更多的陶瓷企业做出真正仿天然石材质感的瓷砖。     

利用锂辉石研制一次烧水晶釉地砖

本文论述了利用锂辉石研制低成本一次快烧水晶釉瓷质地砖，确定了坯釉配方及工艺流程和参数，说明了锂辉石在建筑陶瓷行业的广阔前景。     

专利信息

一种具有抗菌功能的陶瓷釉料及其制备方法本发明公开了一种具有抗菌功能的陶瓷釉料,由抗菌剂、釉层基料以及减水剂按照质量比9:3:2混合配制而成的釉浆,所述抗菌剂溶液内包括抗菌氧化物、醋酸盐以及螯合剂,所述抗菌氧化物包括氧化锌和氧化银,所述醋酸盐为醋酸锌,与现有技术相比,该种具有抗菌功能的陶瓷釉料及其制备方法,内增加有多种金属氧化物,包括氧化银、氧化锌、氧化钛等,大大增加了釉料曾提的抗菌作用,同时增加氧化铬和氧化铜进一步增加抗菌能力,整个釉料抗菌性能好、抗菌持续性强、陶瓷釉面具有自洁功能以及能有效分解被杀灭的细菌残骸。     

读者信箱

正问:生产不同陶瓷发光釉料产品的工艺步骤有哪些?应注意事项有哪些?答:生产不同的陶瓷发光釉料产品,应采用不同的工艺步骤。发光釉料产品大体分为3大类,其生产工艺步骤如下:1发光内墙釉面砖1)将TGB-45M系列发光陶瓷釉料与水按质量比1∶0.6~0.7在球磨机中球磨混合约20min,制备釉浆。2)用喷釉、浇釉、淋釉等方法,在白色陶瓷素坯上形成200~400μm厚的釉层。3)干燥。4)在1 000~1 080℃,35~50min的条件下快速烧成,可以得到发光内墙釉面砖产品。     

利用锂辉石研制一次烧水晶釉地砖

本文论述了利用锂辉石研制低成本一次快烧水晶釉瓷质地砖，确定了坯釉配方及工艺流程和参数，说明了锂辉石在建筑陶瓷行业的广阔前景。     

Development of TiO2 white glazes for ceramic tiles

The objective of this work was the use of titania polymorphs (rutile and anatase) in substitution of zirconia as the main component for producing white opacity in ceramic glazes for tile coatings. Initially, total zirconia (12% mass fraction) was replaced in the standard frit by rutile and by anatase in mass fractions of 5%, 10% and 15%, forming two frit groups processed as ceramic glazes. The glaze color was determined by spectrophotometry and the glaze microstructure by XRD and SEM. The results showed the frit containing 10% anatase formed a totally white glaze presenting excellent coating capacity. The frits containing rutile produced yellow opacity. The results of microscopy and X-rays diffraction revealed that opacity was caused by tiny rutile crystals in the anatase frits and by titanite crystals in the rutile frits.     

Recycling in ceramic glazes of zirconia overspray from thermal barrier coatings manufacturing

Glazed ceramic tiles are the most common building material for floor and wall covering. Glazes are produced from frits. The aim of this work is to make a total or partial replacement of a raw material, zircon, widely used in ceramic tiles manufacturing, with a waste material, in order to prepare ceramic frits. The waste material used in this work, is the overspray zirconia, which is produced during the deposition process by atmospheric plasma spraying (APS) of thermal barrier coatings (TBC) on turbine blades. In particular, a replacement of 100 wt%, 1 wt% and 0.2 wt% of zirconium silicate with zirconia has been studied. Ceramic glazes prepared mixing frits and other raw materials are applied on a single-fired tile. The glazes obtained were characterized with different analytical techniques. This study has revealed that the substitution of zircon with waste zirconia is possible in small percentages due to the presence of small amount of chromophore ions in the overspray zirconia, which tend to colour the glaze.     

Green ceramic pigment based on chromium recovered from a plating waste

The development of pigments with new formulas, departing from lower-cost raw materials, is driven by market growth and competitiveness required by the ceramic sector. In this work, the application of a residue from a metallurgical plant, containing a high amount of chromium (III) in ceramics glazes was studied. Cr₂O₃ was successfully separated from chrome plating waste resulting in a suitable synthesize ceramic pigment, based on this chromophore. A washing treatment was applied to the residue followed by a calcination at 1000 °C prior to the usage as pigment. The adequate purity of Cr₂O₃ recovered from waste was confirmed by analytical techniques (XRF, XRD, DTA-TG, FTIR and SEM-EDX). The glasses, containing 5 wt% of recovered Cr₂O₃, were carried out using frits and transparent micronized glass for mono- and double firing processes. The materials were characterized by XRD and FTIR, and by the colorimetric parameters CIELab. The resulting glazes containing the waste are within the range of typical pigments based on Cr₂O₃ in silicate and aluminate glazes for single firing, showing dark green hues in comparison with the previous data obtained from commercial grade Cr(III) oxide. However the presence of small amounts of the other chromophores in the waste modifies the tonality, affecting the purity of the chroma by increasing darkness. The leaching tests performed on the glazes suggest that Cr(III) is stable in this ceramic matrix. This results show that glazing is a suitable process for the Solidification/Stabilization of this waste.     

建筑卫生瓷釉料综述

根据建筑卫生瓷釉粒一般分类、性质等,从原料组成、釉料性质、制备工艺等方面进行较浅显的介绍,并简介了近年来较为新颖的几种装饰釉料,对建卫瓷熔块、釉料作了简单的综述。     

Recycling of yttria‐stabilized zirconia waste powders in glazes suitable for ceramic tiles

The aim of this work is to demonstrate the feasibility of valorizing and recycling Yttria‐stabilized Zirconia thermal spray waste into high value products for industrial and residential use. Based on the powders chemistry and morphology, this work aims to realize products, like frits suitable for white glazes and ceramic tiles. The focus is on one class of powder: high‐temperature and abrasion‐resistant ceramics, like Yttria‐stabilized zirconia. This study has revealed that the substitution of pure zirconia with waste Yttria‐stabilized zirconia is possible in high percentages, up to 100% to prepare frits suitable for white 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.     

Effect of Aging on Glaze Suspensions Rheology

The rheological behavior of glaze suspensions has to be closely controlled to obtain an adequate final product. In this work, we have studied glaze suspensions produced with a range of industrial frits. The main objective was to establish a correlation between changes in rheological behavior with aging and modifications in the ionic composition of the liquid phase, as a consequence of frit dissolution. Suspension rheology was followed through flow and dynamic oscillatory tests. It was found that frits releasing Ca²⁺, B³⁺, and Pb²⁺ can pose handling problems. To better understand the effect of cations' presence on glaze rheology, industrial glazes were compared with simulated glazes produced with inert silica and several cations. These suspensions reproduced the behavior of the industrial glazes and may be used in the future in stabilization tests.     

Stability of (Cr)CaO.SnO2.SiO2 pink pigment in ceramic frits

Abstract

Incorporation of the (Cr) CaO.SnO₂.SiO₂ pigment in ceramic glazes yields colours with a red component the hue of which depends on the nature of the frits used to produce the glazes. Several samples were prepared by adding this pigment to different frits commonly used in the manufacture of glazed ceramic tiles, each sample subsequently being fired at the appropriate maturing temperature. A study of the resulting glazes shows that variations in colour arise as a result of the three possible phenomena which may develop in firing depending on the frit composition used. These three phenomena are pigment dissolution in the glassy phase, devitrification of crystalline phases whose nature differs from that of the pigment, and immiscible glassy phase separation.     

Factors affecting glaze transparency of ceramic tiles manufactured by the single firing technique

Transparency is an extremely important optical property of several glazes used in the ceramic tile sector. The present work aimed to identify the causes of loss of transparency presented by some ceramic glazes composed of frits with chemical compositions typical of optically transparent glasses. After identifying the causes of low transparency presented by several ceramic glazes based on microstructural analyses, X-ray diffraction and scanning electron microscopy, attempts were made to increase the transparency of these glazes by altering their chemical compositions. The results suggest that the addition of alumina – through distinct mineral sources – may be an interesting alternative to prevent the crystallization of calcium silicates, which reduce the transparency of glazes used in the ceramic tile sector.