Hematite crystal growth in high-temperature lead-free multicomponent alkali borosilicate glass frit for red overglaze enamels |
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| Affiliation: | 1. Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo, 192-0015, Japan;2. Kyoto Municipal Institute of Industrial Technology and Culture, 91 Chudojiawatacho Kyoto Shimogyo-ku, Kyoto, 600-8815, Japan;1. Postgraduate Programme in Materials Science and Engineering, University of São Paulo, USP/FZEA, Av. Duque de Caxias Norte, 225, 13635-900, Pirassununga, Brazil;2. Forschungszentrum Jülich, Institute for Energy and Climate Research (IEK-1), 52425, Jülich, Germany;3. Federal University of Alfenas, José Aurelio Vilela, 11999, Cidade Universitária, BR 267, Km 533, Poços de Caldas, MG, 37715-400, Brazil;4. Department of Biosystem Engineering, Faculty of Animal Science and Food Engineering (FZEA), University of São Paulo (USP), 13635-900, Pirassununga, SP, Brazil;1. Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin, 541004, China;2. Guangxi Universities Key Laboratory of Non-Ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin, 541004, China;3. College of Material Science and Engineering, Baise University, Baise, 533000, China;1. Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE, School of Mechanical Engineering, Shandong University, Jinan 250061, PR China;2. Key National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, PR China;3. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, PR China;4. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, PR China;1. School of Materials Science and Engineering, Henan University of Science and Technology, China;2. Henan Key Laboratory of Materials Science & Processing Technology for Non-ferrous Metals, China;3. Collaborative Innovation Center of Nonferrous Metals, Henan Province, China;4. School of Materials Science and Energy Engineering, Foshan University, China;5. Division of Advanced Materials Engineering, Jeonbuk National University, Republic of Korea |
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| Abstract: | To elucidate the crystal growth process of hematite in high-temperature lead-free multicomponent alkali borosilicate glass, which is essentially important to control the color of red overglaze enamels, frit and hematite mixture is heat-treated and subjected to microscopic observations. Hematite particles slightly grew due to sintering at low temperature. Once the glass matrix formed near the softening point of frit, hematite dissolved into glass fluid. Hematite crystal growth concomitantly ensued with decrease in the number of hematite particles via Ostwald ripening as the temperature increased. The grown particles exhibited an anisotropic morphology with straight outlines reflecting crystal planes, the morphology of which is completely different from those grown by sintering and particles prior to heating. These results suggest that comprehensive understanding of frit and hematite from the perspectives of glass science and chemistry as well as powder technology are important to truly control the color of red overglaze enamels. |
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| Keywords: | Hematite Dispersibility Nanoparticles Red overglaze enamels |
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