Devitrification behaviour of plasma-sprayed glass coatings |
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| Affiliation: | 1. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;2. Graduate PhD’s Degree Program in Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;3. Department of Materials Science, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand;1. School of Materials Science and Engineering, Kunming University of Science and Technology, Xuefu RD, Kunming 650093, China;2. Key Lab of Advanced Materials in Rare & Precious and Nonferrous Metals (Kunming University of Science and Technology), Ministry of Education, Xuefu RD, Kunming 650093, China;1. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China;2. University of Chinese Academy of Sciences, Beijing 100039, China;1. Naval Materials Research Laboratory, Addl. Ambernath, Thane 421506, Maharashtra, India;2. Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India |
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| Abstract: | Glass and glass-ceramic coatings on ceramic tiles have been manufactured by plasma-spraying high-performance CAS (in wt%—SiO2, 60%; Al2O3, 15%; CaO, 23%; others, traces) and CZS (in wt%—SiO2, 50%; CaO, 31%; ZrO2, 16.5%; Al2O3, 2%; others, traces) glass frits. The CZS system has a surface crystallization at about 1050 °C. Such behaviour would not easily allow to obtain a fully crystalline bulk glass-ceramic, but the defectiveness of the plasma-sprayed coating supplies many nucleation sites. Thus, it becomes completely crystalline and well sintered after a 850 °C for 30 min + 1050 °C for 15 min treatment. The CAS frit, designed not to produce significant crystallization, is well sintered after a 850 °C for 30 min + 950 °C for 30 min thermal treatment, but remains too brittle due to its glassy nature. A 1050 °C treatment allows a few pseudowollastonite crystals to form in a glassy matrix; their formation also hinders sintering. Thus, mechanical properties are inferior to heat-treated plasma-sprayed CZS. |
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