Citation
Radzali Othman, . and Malek Selamat, . (2009) The effect of fabrication routes on crystallisation behaviour of canasite-based glass-ceramics. [Proceedings Paper]
Abstract
Glass-ceramics based on the naturally occurring chain silicate canasite has been produced using nonstoichiometric composition of SiOrNa20-CaO-K20-CaF2 glass system. The glass-ceramics was fabricated by two routes; melt casting to form bulk samples and sintering of glass powder compact to form sintered samples. The thermal properties. phase evolution and microstructure formation of the glass -ceramics material have been investigated respectively using a differential thermal analysis and scanning calorimetry DTA and DSC X-ray diffraction XRD and scanning electron microscopy SEM. The density of the samples was measured using water displacement and gas pycnometer. The results showed that the glass transition occurs at about 550C for both bulk and powder samples. The crystallisation and melting temperatures of bulk sample started at about 86rC and 975C. While for powder samples the above temperatures was reduce to about 770C and 905C. Sintering of glass powder compact produced low density glass-ceramics compared to bulk sample ofmelt casting route. XRD results revealed the presence of canasite and frankamenite as major crystal phases in bulk and sintered glass-ceramics. The SEM micrographs showed that canasite glass-ceramics prepared by sintering route had finer grained crystal. Heat-treatment ofglass samples nearly melting temperature cause d the crystallite to dissolve in the residual glassphaseandporestodevelop andconsequentlydecreasedthedensity ofglass-ceramics.
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Abstract
Glass-ceramics based on the naturally occurring chain silicate canasite has been produced using nonstoichiometric composition of SiOrNa20-CaO-K20-CaF2 glass system. The glass-ceramics was fabricated by two routes; melt casting to form bulk samples and sintering of glass powder compact to form sintered samples. The thermal properties. phase evolution and microstructure formation of the glass -ceramics material have been investigated respectively using a differential thermal analysis and scanning calorimetry DTA and DSC X-ray diffraction XRD and scanning electron microscopy SEM. The density of the samples was measured using water displacement and gas pycnometer. The results showed that the glass transition occurs at about 550C for both bulk and powder samples. The crystallisation and melting temperatures of bulk sample started at about 86rC and 975C. While for powder samples the above temperatures was reduce to about 770C and 905C. Sintering of glass powder compact produced low density glass-ceramics compared to bulk sample ofmelt casting route. XRD results revealed the presence of canasite and frankamenite as major crystal phases in bulk and sintered glass-ceramics. The SEM micrographs showed that canasite glass-ceramics prepared by sintering route had finer grained crystal. Heat-treatment ofglass samples nearly melting temperature cause d the crystallite to dissolve in the residual glassphaseandporestodevelop andconsequentlydecreasedthedensity ofglass-ceramics.
Additional Metadata
| Item Type: | Proceedings Paper |
|---|---|
| Additional Information: | Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. mal QE 351 M664 2009 Call Number |
| AGROVOC Term: | Fabrication |
| AGROVOC Term: | Crystallization |
| AGROVOC Term: | Ceramics |
| AGROVOC Term: | Silicates |
| AGROVOC Term: | Thermal properties |
| AGROVOC Term: | Scanning microscopy |
| AGROVOC Term: | diffraction |
| AGROVOC Term: | Heat treatment |
| AGROVOC Term: | Melting point |
| AGROVOC Term: | Microstructure morphology |
| Geographical Term: | MALAYSIA |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 05:14 |
| URI: | http://webagris.upm.edu.my/id/eprint/12175 |
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