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>Influences of composition, melt viscosity and crystallization on the color strength and stability of multioxide glass frit/zircon-vanadium pigment systems for ceramic whitewares coatings applications.
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Influences of composition, melt viscosity and crystallization on the color strength and stability of multioxide glass frit/zircon-vanadium pigment systems for ceramic whitewares coatings applications.
Color control is becoming increasingly important in the industrial processing of ceramics coatings. Multi-oxide glass frits are the predominant materials in ceramic whitewares coatings, and zircon doped pigments are the most commonly used colorants.;The primary objective of this research was to determine if glass frits could be formulated to improve the fired color strength and high-temperature stability of ceramic coatings colored with zircon-vanadium (Zr-V) blue pigments. The results would also be applicable to other ceramic pigments that utilize the same zircon structure to incorporate colorant metal ions. A secondary goal was to relate the frit oxide composition, pigment content, firing temperature, melt viscosity and microstructural development to the fired color. A ceramic tile process was applied to fabricate sample coatings for the study. A coating's color was quantified and related to human perception with CIE L*, a* and b* values and pigment absorption factors (K/S), calculated based on spectral reflectance data.;The research was successful in quantifying the influence of individual glass frit oxides on the fired color strength and high-temperature stability of the coatings. Opaque and transparent glossy frit compositions which yield excellent color strength and stability were formulated. Mathematical models for predicting a coating's color strength and stability given the frit oxide composition, Zr-V pigment loading and peak firing temperature were derived. Frit oxides of ZrO2, SrO, ZnO, Al2O3, Na 2O and K2O were found to have a significant influence on crystallization, pigment dissolution and color development. The properties, sizes, morphologies and quantities of crystalline phases that precipitated in the coatings during firing were related to the color. A technique for producing uniquely light yet high chroma colors through control of zircon precipitate particle size was demonstrated.;In addition, a statistical model was developed for calculating the coating melt viscosity as a function of the frit oxide composition and temperature. Melt viscosity versus temperature curves were applied to predict a frit's potential for producing strong and stable color.
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机译:在陶瓷涂料的工业加工中,色彩控制变得越来越重要。多氧化物玻璃粉是陶瓷白色涂料中的主要材料,锆石掺杂的颜料是最常用的着色剂。这项研究的主要目的是确定是否可以配制玻璃粉来改善烧成的色强度和高色度。锆钒钒(Zr-V)蓝色颜料着色的陶瓷涂层的温度稳定性。该结果也将适用于其他利用相同锆石结构掺入着色剂金属离子的陶瓷颜料。第二个目标是将玻璃料的氧化物组成,颜料含量,烧成温度,熔体粘度和微结构发展与烧成的颜色联系起来。本研究采用瓷砖工艺制造样品涂层。根据光谱反射率数据计算出涂层的颜色,并通过CIE L *,a *和b *值以及颜料吸收因子(K / S)对涂料的颜色进行定量并与人的感知有关;该研究成功地量化了单个玻璃的影响烧结玻璃氧化物对涂料的着色强度和高温稳定性的影响。配制了具有优异的色强度和稳定性的不透明透明光泽玻璃料组合物。推导了在给出玻璃料氧化物组成,Zr-V颜料负载量和峰值烧成温度的情况下预测涂料的颜色强度和稳定性的数学模型。发现ZrO2,SrO,ZnO,Al2O3,Na 2O和K2O的玻璃料氧化物对结晶,颜料溶解和显色有重大影响。烧成过程中沉积在涂层中的结晶相的性质,大小,形态和数量与颜色有关。演示了一种通过控制锆石沉淀物粒度来产生独特的浅色但色度高的颜色的技术。此外,开发了一种统计模型来计算涂层熔体粘度随熔块氧化物组成和温度的变化。应用熔体粘度对温度的曲线来预测玻璃料产生强烈和稳定颜色的潜力。
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