Based on the mass action concentration theory,a novel thermodynamic analysis for the raw material ratio in the procedure of preparing Ti-6Al-4V alloy by aluminothermic reduction process is proposed in this paper,which...Based on the mass action concentration theory,a novel thermodynamic analysis for the raw material ratio in the procedure of preparing Ti-6Al-4V alloy by aluminothermic reduction process is proposed in this paper,which is originated from TiO_(2),Al particles,and V_(2)O_(5) as feedstocks,and the relevant equilibrium thermodynamics was calculated through this new method.The results show that the range of aluminum addition coefficient in raw material to experiment should be controlled within 61.5%-100%,which can significantly reduce the number of experimental groups.This method is ready to regulate the matter of excessive aluminum content in reactants for materials preparation,especially for those reactions including elements that are effortless to combine with aluminum to form the corresponding intermetallics or alloys.In addition,it can also be used in general metallurgy or material preparation process to effectively predict the composition and proportion of equilibrium components under certain conditions.展开更多
分别对Al-TiO_2,Al-V_2O_5,Al-V_2O_5-TiO_2及Al-V_2O_5-TiO_2-CaO体系的热力学和动力学进行了研究.结果表明:采用铝粉直接还原TiO_2,V_2O_5粉末制备Ti-6Al-4V合金是可行的.加入CaO会降低体系单位质量反应热,需要补热才能维持反应进行.A...分别对Al-TiO_2,Al-V_2O_5,Al-V_2O_5-TiO_2及Al-V_2O_5-TiO_2-CaO体系的热力学和动力学进行了研究.结果表明:采用铝粉直接还原TiO_2,V_2O_5粉末制备Ti-6Al-4V合金是可行的.加入CaO会降低体系单位质量反应热,需要补热才能维持反应进行.Al还原TiO_2的反应在951℃发生,表观活化能E1为166.47 k J/mol,反应级数n1为0.398 2;Al还原V_2O_5的反应在946℃发生,表观活化能E_2为392.72 k J/mol,反应级数n_2为1.061 8.Al粉还原V_2O_5和TiO_2制备Ti-6Al-4V合金体系的反应在1 019℃左右发生,表观活化能E3为173.56 k J/mol,反应级数n3为0.472 2;加入CaO后,反应在979℃左右发生,体系表观活化能升高但反应级数降低.这四个体系均属于液-固反应体系.展开更多
基金the National Natural Science Foundation of China(No.U1908225)the Doctoral Scientific Research Foundation of Liaocheng University (No.318052124)。
文摘Based on the mass action concentration theory,a novel thermodynamic analysis for the raw material ratio in the procedure of preparing Ti-6Al-4V alloy by aluminothermic reduction process is proposed in this paper,which is originated from TiO_(2),Al particles,and V_(2)O_(5) as feedstocks,and the relevant equilibrium thermodynamics was calculated through this new method.The results show that the range of aluminum addition coefficient in raw material to experiment should be controlled within 61.5%-100%,which can significantly reduce the number of experimental groups.This method is ready to regulate the matter of excessive aluminum content in reactants for materials preparation,especially for those reactions including elements that are effortless to combine with aluminum to form the corresponding intermetallics or alloys.In addition,it can also be used in general metallurgy or material preparation process to effectively predict the composition and proportion of equilibrium components under certain conditions.
文摘分别对Al-TiO_2,Al-V_2O_5,Al-V_2O_5-TiO_2及Al-V_2O_5-TiO_2-CaO体系的热力学和动力学进行了研究.结果表明:采用铝粉直接还原TiO_2,V_2O_5粉末制备Ti-6Al-4V合金是可行的.加入CaO会降低体系单位质量反应热,需要补热才能维持反应进行.Al还原TiO_2的反应在951℃发生,表观活化能E1为166.47 k J/mol,反应级数n1为0.398 2;Al还原V_2O_5的反应在946℃发生,表观活化能E_2为392.72 k J/mol,反应级数n_2为1.061 8.Al粉还原V_2O_5和TiO_2制备Ti-6Al-4V合金体系的反应在1 019℃左右发生,表观活化能E3为173.56 k J/mol,反应级数n3为0.472 2;加入CaO后,反应在979℃左右发生,体系表观活化能升高但反应级数降低.这四个体系均属于液-固反应体系.
