为了对非晶合金晶化动力学参数的各种计算方法的优缺点进行分析比较,为正确合理的选用数据处理方法提供依据,介绍了非等温晶化激活能及晶化机理函数的各种计算方法及其计算原理,并进行了数学归纳.分析表明,在计算激活能的各种方法中,无模式等转化率法是最可靠的一类方法,分为晶化速率-等晶化体积分数法、基于温度积分近似解析解的等晶化体积分数法、最大速率法3种类型.当热分析曲线基线难以精确确定时,用第二种类型计算出的激活能比第一种类型精度高.在确定机理函数的两种方法(Surinach曲线拟合法和Popesc曲线拟合法)中,Popesc法可以直接利用实验数据的积分而不需要提前知道速度常数和激活能,其结果的可靠性更高.
参考文献
| [1] | 胡荣祖;史启祯.热分析动力学[M].北京:科学出版社,2001 |
| [2] | Baram J.;Erukhimovitch V. .Application of thermal analysis methods to nucleation and growth transformation kinetics, part II[J].Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems,1998(1/2):43-51. |
| [3] | Starink MJ. .The determination of activation energy from linear heating rate experiments: a comparison of the accuracy of isoconversion methods[J].Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems,2003(1/2):163-176. |
| [4] | LI C R;TANG T B .A new method for analyzing non-isothermal thermoanalytical data solid-state reactions[J].Thermochimica Acta,1999,325:43-46. |
| [5] | Starink MJ. .A NEW METHOD FOR THE DERIVATION OF ACTIVATION ENERGIES FROM EXPERIMENTS PERFORMED AT CONSTANT HEATING RATE[J].Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems,1996(1/2):97-104. |
| [6] | FLYNM J H .Isoconversional method for determination of energy of activation at constant heating rate:Corrections for the doyle approximation[J].Journal of Thermal Analysis,1983,27:95-103. |
| [7] | BOSWELL P G .Effect of thermal history on the crystallization kinetics of a liquid-quenched metallic glass[J].Journal of Materials Science,1980,15:1926-1938. |
| [8] | Lopez-Alemany PL.;Villares P.;Jimenez-Garay R.;Vazquez J. .A kinetic study on non-isothermal crystallization of the glassy alloy Sb0.16As0.43Se0.41[J].Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites,2000(1/3):249-256. |
| [9] | M(A)LEK J .The applicability of Johnson-Mehl-Avrami model in the thermal analysis of the crystallization kinetics of glasses[J].Thermochimica Acta,1995,267:61-73. |
| [10] | SEST(A)K J;BERGGREN B .Study of the kinetics of the mechanism of solid-state reactions at increasing temperatures[J].Thermochimica Acta,1971,3:1-12. |
| [11] | Popescu C. .INTEGRAL METHOD TO ANALYZE THE KINETICS OF HETEROGENEOUS REACTIONS UNDER NON-ISOTHERMAL CONDITIONS - A VARIANT ON THE OZAWA-FLYNN-WALL METHOD[J].Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems,1996(2):309-323. |
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