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Sm2Fe17合金的熱穩定性

Thermal stability of Sm2Fe17 alloy

  • 摘要: 用熱重/差熱(TG/DTA)分析法研究了粒度及升溫速度對Sm2Fe17合金熱穩定性的影響,結合XRD物相分析結果說明Sm2Fe17合金氧化過程中發生的化學反應,用Kinssinger法計算了Sm2Fe17合金被氧化所需的表觀活化能并推斷了其反應機理.結果表明:Sm2Fe17合金粉的粒度越細,其熱穩定性越差;升溫速度越快,Sm2Fe17合金的氧化溫度增高,放出的熱量減小.Kinssinger法計算Sm2Fe17合金在低溫氧化時的表觀活化能為162kJ·mol-1,在高溫氧化時為189.8kJ·mol-1.

     

    Abstract: The effects of particle size and heating rate on the thermal stability of Sm2Fe17 alloy were investigated by TG/DTA technique. Chemical reactions during the oxidation of Sm2Fe17 alloy were confirmed with XRD and TG/DTA results. The apparent activation energy of the oxidation of Sm2Fe17 alloy was calculated by the Kinssinger equation and the reaction mechanism was deduced. The results show that the thermal stability of Sm2Fe17 alloy decreases with the decrease in particle size; and the sooner the heating rate is, the higher temperature needs for Sm2Fe17 alloy being oxidized and the less thermal it gives out. Further studies indicate that the apparent activation energies of low-temperature oxidation and high-temperature oxidation of Sm2Fe17 alloy are 162 kJ·mol-1 and 189.8 kJ·mol-1, respectively.

     

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