Abstract
The dynamic properties and thermal history of Fe40Al at.% intermetallic particles have been estimated. The parameters of the gas detonation process for the investigated mixture have been calculated using thermochemical code, and the motion parameters as well as thermal history of the analyzed powder particles have been assessed using computational fluid dynamics software and self-developed algorithms. The appropriate models allowed for determination of the melted volume (mass) fraction of a certain analyzed single particle, which is dependent on a particle diameter ranging from 10 to 160 μm. The results show that only particles with a diameter lower than 80 μm melt under the investigated conditions. Moreover, the estimated radial distribution of the temperature inside the particle is almost homogenous due to relatively high FeAl thermal conductivity and relatively low thermal conductance of the surface heat transfer. The calculated final velocity of particles has been referred to some experimental and literature data from previous studies by other researchers, and the results were found to be in agreement.
Highlights
Theoretical estimation of motion dynamics and the temperature history of powder particles during gas detonation spraying (GDS) is a crucial issue in adjustment of the GDS process parameters to powder particle size distribution and particle material physical properties in view of the required coating properties
In order to reduce the effects of these drawbacks, the authors of (Ref 5, 6) proposed a twodimensional numerical model which allowed for considerations of additional effects, for example, particle interaction with reflected waves and the motion and thermal interaction of powder in the external conditions
The formulation of the analytical and numerical model description for the heat, mass and momentum transfer phenomenon to the FeAl particle thermal state evaluation was based on the GDS experiment carried out in the Ukrainian Academy of Sciences, at E.O
Summary
Theoretical estimation of motion dynamics and the temperature history of powder particles during gas detonation spraying (GDS) is a crucial issue in adjustment of the GDS process parameters to powder particle size distribution and particle material physical properties in view of the required coating properties. As shown in (Ref 1, 2), the appropriate analyses involve problems characterized by coupling of mechanical and thermodynamic phenomena This state of matter seriously limits the availability of analytical solutions and hinders developments of general models describing the investigated problem. The authors estimated the muzzle velocity of powder particles, using a simple one-dimensional detonation model for the explosive gas mixture This approach required the application of numerical integration of the differential equation of motion for a particle. Making use of numerical schemes, the thermal interaction between powder and gaseous medium has been investigated (Ref 4) In both cases, the authors (Ref 3, 4) used a one-dimensional model and their considerations were limited to motion of the powder–gas mixture only in the barrel. In order to reduce the effects of these drawbacks, the authors of (Ref 5, 6) proposed a twodimensional numerical model which allowed for considerations of additional effects, for example, particle interaction with reflected waves and the motion and thermal interaction of powder in the external conditions
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