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Synthesis of gold pearlescent pigment via heat treatment of mica

机译：云母热处理合成金珠光颜料

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摘要

Pearlescent pigments are widely used to decorate ceramic tableware and architectural ceramics. Coating of mica with high-refractive metal oxides such as titanium oxide is one of the most important synthesis methods of these pigments. However, this process is expensive and long. Moreover, because of the complexity of the process, it is difficult to control and obtain consistent color. This depends on the thickness of the deposited thin film layer. In this study, a low-cost and easy method is proposed to synthesize gold pearlescent pigment. In this case, bulk mica (phlogopite) is heat-treated at appropriate temperatures, determined from related differential thermal analysis (DTA) profiles. Then, the obtained materials are milled for about 2 h and sieved in the 20-60 μm range. X-ray diffraction (XRD) and goniospectropho-tometery are used for characterization of the obtained pigment. XRD results showed a few changes in related patterns of the primary sample. In this case, a part of the initial phase of phlogopite was changed to Mg_2SiO_4 (forsterite) and K_2MgSi_5O_(12) (leucite). Goniospectro-photometer results demonstrated the highest reflectance in the 560-570 nm range (yellow color), and showed a satisfactory level of brightness and lightness of the obtained gold color.
机译：珠光颜料被广泛用于装饰陶瓷餐具和建筑陶瓷。用高折射金属氧化物如氧化钛涂覆云母是这些颜料最重要的合成方法之一。但是，该过程昂贵且耗时长。此外，由于工艺的复杂性，难以控制和获得一致的颜色。这取决于沉积的薄膜层的厚度。在这项研究中，提出了一种低成本，简便的方法来合成金珠光颜料。在这种情况下，根据相关的差热分析（​​DTA）曲线确定，在适当的温度下对块状云母（金云母）进行热处理。然后，将获得的材料研磨约2小时，并在20-60μm的范围内进行筛分。 X射线衍射（XRD）和测角分光光度法用于表征所获得的颜料。 XRD结果显示原始样品的相关模式发生了一些变化。在这种情况下，金云母的初始阶段的一部分变为Mg_2SiO_4（镁橄榄石）和K_2MgSi_5O_（12）（白云石）。 Gonio分光光度计的结果表明，在560-570 nm范围内具有最高的反射率（黄色），并且所获得的金色具有令人满意的亮度和明度。

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