Mica platelet-reinforced geopolymer composites
© 2017 by The American Ceramic Society. Composites of phlogopite mica platelets of composition KMg 3 AlSi 3 O 10 (F,OH) 2 dispersed in potassium-based potassium geopolymer were fabricated. The platelet additions of up to 25 wt% were achieved which increased the flexure strength and thermal conductiv...
| Main Authors: | , , , , |
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| Format: | Book Chapter |
| Published: |
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/67069 |
| Summary: | © 2017 by The American Ceramic Society. Composites of phlogopite mica platelets of composition KMg 3 AlSi 3 O 10 (F,OH) 2 dispersed in potassium-based potassium geopolymer were fabricated. The platelet additions of up to 25 wt% were achieved which increased the flexure strength and thermal conductivity of pure potassium-based geopolymer. A maximum 3-point flexure strength at room temperature was measured as 11.4 MPa with a standard deviation of 0.34 MPa for 25 wt% mica additions. Heat treatments caused chemical decomposition and water loss at temperatures up to 700 °C and eventual formation of glassy and crystalline leucite at 1000°C. A maximum post-treatment strength of 10.7 MPa with a standard deviation of 0.52 MPa was obtained for the 1000°C heat-treated samples. The thermal conductivity increased from 0.24 ± 0.000 W/mK for pure K-based geopolymer to 0.30 ± 0.008 W/mK, as a function of mica platelet additions up to 10 wt %. |
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