| Autor: |
E Rujirakamort, Siripan Nilpairach, B Vorajesdarom, Thanakorn Wasanapiarnpong, C Mongkolkachit |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
IOP Conference Series: Materials Science and Engineering. 18:222028 |
| ISSN: |
1757-899X |
| DOI: |
10.1088/1757-899x/18/22/222028 |
| Popis: |
Silica glass is an interesting material due to its low thermal expansion coefficient, high chemical inertness, and transparency. In this study, low cost rice husk ash waste containing mainly amorphous silica phase was used as a starting raw material. Formation of cristrobalite caused product damage during cooling down was suppressed by an addition of some sintering aids. Spodumene was selected to use as the sintering aid due to its ability to promote the sinterability of the rice husk ash by liquid phase forming. Lithium carbonate and aluminum nitrate were mixed with the rice husk ash as starting chemicals for spodumene forming. To investigate the effects of spodumene addition on densification, physical properties and thermal expansion coefficient, 25 and 50 mass% of spdumene were added to the mixture. Mixed powders were dry pressed into pellet shapes and sintered at 1000-1250 °C for 30 min in an electric furnace. It was found that 50 mass% addition of spodumene enhanced the densification of the specimens sintered at the temperature higher than 1250 °C. Water absorption was reduced to 1.11 % with bulk density of 2.12 g/cm3. Low thermal expansion coefficient of 2.70×10−6 /°C was achieved with only the petalite phase detection. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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