铁液中Al_2O_3纳米颗粒溶解和熔化的热力学研究  

Dissolution and Melting Thermo-dynamics of Al_2O_3 Nano-particles in Liquid Iron

作　　者：王国承[1] 侯春菊[2] 张立恒[1] 刘伟[1] 

机构地区：[1]江西理工大学材料与化学工程学院,江西赣州341000 [2]江西理工大学理学院,江西赣州341000

出　　处：《有色金属科学与工程》2011年第1期23-27,共5页Nonferrous Metals Science and Engineering

基　　金：国家自然科学基金青年科学基金资助项目(51004054);江西省教育厅青年科学基金项目(GJJ09519)

摘　　要：与块体材料相比,纳米材料尺寸小、界面能大,导致其溶解和熔化过程的热力学不同于块体材料.从理论上推导了Al2O3纳米颗粒在铁液中的元素平衡溶度积以及熔化温度与颗粒尺寸之间的关系,结果表明,随颗粒尺寸减小,平衡溶度积逐渐增加,熔化温度逐渐下降,而且粒径越小,平衡溶度积和熔化温度的变化率越大.经计算,1873K铁液中Al2O3的质量分数为0.01%时,半径为0.1nm的Al2O3颗粒比块体Al2O3的平衡溶度积增加了11.71%;半径为1nm的Al2O3颗粒在空气和铁液中的熔化温度分别为1849K和1267K,比块体Al2O3的熔化温度分别下降了454K和1036K.The thermodynamics such as dissolve and melt process of nano-material is different from bulk material because of fine size and high interfacial energy of nano-material.The relations between element equilibrium solution product,melting point and size of nano-particle have been deduced.Results show that element equilibrium solution product increase and melting point drop down gradually with the decrease of nano-particle size.The change of equilibrium solution and melting point increases with the variation of nano-particle size.Calculations show that increment percent of element equilibrium solution product is 11.71% of radius 0.1nm Al2O3 than bulk Al2O3 that 0.01% mass in liquid iron.The melting points of radius 1nm Al2O3 are respectively 1849K and 1267K in the atmosphere and liquid iron.The decrement of melt points are respectively 454K and 1036K.

关 键 词：铁液 纳米AL2O3 溶解 熔化 

分 类 号：TF513[冶金工程—钢铁冶金]