Publication: Penghasilan kaca dari abu kayu mangga
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Date
2005-03-01
Authors
Saidin, Salina
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Abstract
An innovative glass based on aluminosilicate system, SiO2-Al2O3-Na2O-CaO was produced of using mango wood ash as part the principal source of calcium oxide, CaO. Mango wood ash burning by dried mango chips in closed system at 10000C for 40 minutes soaking time. XRD analysis showed that the ash produced is high in CaO and XRF analysis confirmed that the CaO content in the wood ash is 71 weight %. Particle size distribution and DSC/TG analysis were also conducted on the ash. A local silica sand was processed by washing, scrubbing and magnetic separation to separate out the impurities before being used in the glass composition to supply the SiO2 requirement. The batch composition was calculated before melting the glass at 15000C for 5 hours soaking duration. A clear and bubble-free glass is successfully produced. Density and hardness (Vickers) tests conducted on the glass gave values of 2.64 g/cm3 and 617.3 HV respectively. Subsequently heat treatment on the glass at 8900C (nucleation) for 1 hour followed by 9100C (crystal growth) for 5 hours has also successfully produced a glass ceramic. Scanning Electron Microscopy (SEM) was used to analysis the morphology and size of the crystals produced.