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LI Xiaoquan
DU Zeyu
School of Materials Science
and Engineering,
Tianjin University,
Tianjin 300072, China
YANG Xuguang
School of Materials Science
and Engineering,
Jiangsu University of Science
and Technology,
Zhenjiang 212003, China
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NON-EQUILIBRIUM STATIONARY
STATE IN CHEMICAL REACTION OF
SiO2/Fe
AT INTERFACE OF
SLAG/METAL AND ITS STABILITY DURING ARC WELDING*
Abstract: For characteristics of open
and far from thermodynamic equilibrium in welding chemical
reaction, a new kind of quantitative method, which is used to
analyze direction and extent for chemical reaction of SiO2/Fe
during quasi-steady state period, is introduced with the concept
of non-equilibrium stationary state. The main idea is based on
thermodynamic driving forces, which result in non-zero
thermodynamic fluxes and lead to chemical reaction far away from
thermodynamic equilibrium. There exists certain dynamic
equilibrium relationship between rates of diffusion fluxes in
liquid phase of reactants or products and the rate equation of
chemical reaction when welding is in quasi-steady state. As
result of this, a group of non-linear equations containing
concentrations of all substances at interface of
slag/liquid-metal may be established. Moreover the stability of
this non-equilibrium stationary state is discussed using
dissipative structure theory and it is concluded theoretically
that this non-equilibrium stationary state for welding chemical
reaction is of stability.
Key words:
Welding chemical metallurgy Non-equilibrium stationary state Dissipative structure
Stability |