나노크기 Sn 분말의 산화열처리에 의한 SnO2분말의 합성 및 미세조직 특성
Synthesis of SnO2 Powders by Oxidation Heat Treatment of Nano-sized Sn Powders and Their Microstructural Characteristics
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Abstract
Oxidation behavior and microstructural characteristics of nano-sized Sn powder were studied. DTA-TG analysis showed that the Sn powder exhibited an endothermic peak at 227℃ and exothermic peak at 560℃ with an increase in weight. Based on the phase diagram consideration of Sn-O system and XRD analysis, it was interpreted that the first peak was for the melting of Sn powder and the second peak resulted from the formation of SnO2 phase. Microstructural observation revealed that the SnO2 powder, heated to 1000℃ under air atmosphere, consisted of agglomerates with large particle size due to the melting of Sn powder during heat treatment. Finally, fine SnO2 powders with an average size of 50 nm can be fabricated by controlled heat treatment and ultrasonic milling process.
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