Characterization of some natural materials with different morphologies and their mullitization in ceramic preparation
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This study aimed to investigate the characteristics of three types of natural materials (KLC, KPT, and SSB) obtained fromregular deposits in Vietnam and their mullitization at calcinated temperatures of 1000 °C, 1200 °C, and 1400 °C. The sampleswere characterized by X-ray diffraction (XRD), X-ray fluorescence analysis (XRF), thermal analysis (the thermogravimetry/differential scanning calorimetry (TG/DSC)), and scanning electron microscope with energy-dispersive X-ray spectroscopy(SEM-EDS). The results indicated that kaolinite, halloysite, and sericite are the dominant minerals in the KLC, KPT, and SSBsamples, with particle sizes under 2 μm. These minerals' morphology was typical, with pseudo-hexagonal and stratifiedkaolinite, tubular halloysite, and thin platy sericite. The samples' chemical compositions are mainly SiO2 and Al2O3, followedby (K2O+Na2O), TiO2, and total iron content. Thermal analysis shows that the metakaolin phase is formed at differenttemperatures for the halloysite and kaolinite samples, as indicated by endothermic peaks at 411 °C for KPT and 436 °C forKLC. The quartz phase transition is also detected at different temperatures for the samples, with low-to-high temperatureendothermic peaks at 559 °C (KPT), 569 °C (KLC), and 575 °C (SSB). The mullitization process is observed to start attemperatures above 1000 °C and is critical at around 1400 °C, with well-crystal mullites appearing. The mineral compositionand morphology of the starting materials influence the size of the mullite crystals. SSB has larger mullite crystals than KLCand KPT at a sintering temperature of 1400 °C. It suggests that mineral composition, mineral morphology, and particle sizeof starting materials can also be essential factors influencing to mullitization process and ceramic products.
Abstract
This study aimed to investigate the characteristics of three types of natural materials (KLC, KPT, and SSB) obtained fromregular deposits in Vietnam and their mullitization at calcinated temperatures of 1000 °C, 1200 °C, and 1400 °C. The sampleswere characterized by X-ray diffraction (XRD), X-ray fluorescence analysis (XRF), thermal analysis (the thermogravimetry/differential scanning calorimetry (TG/DSC)), and scanning electron microscope with energy-dispersive X-ray spectroscopy(SEM-EDS). The results indicated that kaolinite, halloysite, and sericite are the dominant minerals in the KLC, KPT, and SSBsamples, with particle sizes under 2 μm. These minerals' morphology was typical, with pseudo-hexagonal and stratifiedkaolinite, tubular halloysite, and thin platy sericite. The samples' chemical compositions are mainly SiO2 and Al2O3, followedby (K2O+Na2O), TiO2, and total iron content. Thermal analysis shows that the metakaolin phase is formed at differenttemperatures for the halloysite and kaolinite samples, as indicated by endothermic peaks at 411 °C for KPT and 436 °C forKLC. The quartz phase transition is also detected at different temperatures for the samples, with low-to-high temperatureendothermic peaks at 559 °C (KPT), 569 °C (KLC), and 575 °C (SSB). The mullitization process is observed to start attemperatures above 1000 °C and is critical at around 1400 °C, with well-crystal mullites appearing. The mineral compositionand morphology of the starting materials influence the size of the mullite crystals. SSB has larger mullite crystals than KLCand KPT at a sintering temperature of 1400 °C. It suggests that mineral composition, mineral morphology, and particle sizeof starting materials can also be essential factors influencing to mullitization process and ceramic products.
참고문헌 (20)
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