Abstract
Ceramic pigments have been widely used in a variety of industries because of their excellent properties, such as high thermal stability, low-cost productions, and simple manufacturing processes. Re-use of mirror waste, which consists of silicon dioxide greater than 70%, is a method that can reduce raw materials cost. In this work, ceramic pigment with forsterite structure, Mg2SiO4, was synthesized via conventional solid state reaction by using mirror waste as a precursor. Solid solutions of Co-doped forsterite pigment, CoxMg(2−x)SiO4 where x = 0.02–1.6, were calcined at 1000 °C for 2 h. The calcined powders were characterized by X-ray diffraction technique (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), UV-Vis spectrophotometer, and color measurement (CIEL*a*b*). XRD results confirmed that forsterite phase was found as a main phase in the ceramic powder. However, the forsterite phase decreased with increased concentration of Co to x = 0.8–1.6. This could be because of the solubility limit of Co in solid solution. In addition, the use of mirror waste as a raw material was able to reduce calcination temperature compared to the use of oxide reagents. Color measurements or CIEL*a*b* color space of forsterite pigments were located in red-blue quadrant for Co-doped pigment.
Highlights
Ceramic pigments have been used extensively in decorative industries as a coloration component due to their advantages such as low-cost productions, stability, longevity, and mass-producibility.Even though ceramic pigments possess many advantages, the reduction of raw materials cost is still needed to compete in the market
This study aims to synthesize the forsterite pigment and characterize its properties by using mirror waste as a raw material and cobalt oxide as a chromophore of the pigment
The pigments with Co-doped forsteritre structure were successfully synthesized from mirror waste
Summary
Ceramic pigments have been used extensively in decorative industries as a coloration component due to their advantages such as low-cost productions, stability, longevity, and mass-producibility.Even though ceramic pigments possess many advantages, the reduction of raw materials cost is still needed to compete in the market. Re-use of industrial waste is the current trend to lower the cost of raw materials. This waste is disposed of in landfill. The advantage of these wastes for re-use is their amorphous structure. Such structure could lead to a lower reaction temperature. This might cause a variation in pigment properties, such as firing formula and color tone, due to the composition differences between the waste and pure reagents
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