Thermodynamic analysis and reaction kinetic for the preparation of aerospace-grade AlV85 master alloy
The Gibbs free energy,adiabatic temperature and calorific value of A1V85 master alloy prepared by alu-minothermal method were calculated according to the thermodynamie prineiples,the process was studied using dif-ferential thermal analysis,the kinetic equations of A1V85 alloy produced by the aluminothermal method with differ-ent sizes of Al powder were constructed.The reaction of A1V85 master alloy by the aluminothermal method can be carried out and maintained spontaneously,with adiabatic temperature of 2 327 K and calorific value of 4 169 J/mol.Al powder is melted first and reacts with solid V2O5 to replace V and produce part of AlmVn,then part of V and AlmVn react to form V solid solution at about 1 000 K.The particle size of aluminum powder has a great influence on the reaction process and reaction products;The kinetic equations of A1V85 master alloy preparation with differ-ent particle sizes aluminum powder is constructed,the smaller the particle size,the lower the activation energy and the higher the frequency factor.
A1V85master alloythermite methodthermodynamics and dynamicsdifferential thermal analysis
NETL
NSTL
万方数据
