Abstract
To determine the relationship between the deposition characteristics of semi-molten particles and the porosity of porous materials prepared by flame spraying, metal powders of Mo and 316L were used and the melting degree of deposition particles was controlled. Based on the experimental observations, a three-dimensional, random-stacking model was established by introducing the slipping characteristics of semi-molten particles, which could help predict the porosity of the generated porous metal materials. The results show that the maximum porosity of porous materials deposited by semi-molten particles was about 82%. A one-to-one relationship was observed between the melting degree of particles and the porosity of deposited samples. The three-dimensional random model could successfully predict the porosity of porous materials by combining the melting degree and slipping characteristics of spray particles, and the predicted values were consistent with the experimental results. The results of this study are useful to control the pore structure of porous materials deposited by semi-molten spraying particles.
Highlights
Porous metal has the properties of the metal itself, and has several special properties, such as high energy absorption, large specific surface area and high permeability, due to its pore structure [1,2]
According to the simulated calculation with the slip distance of Mo and 316L particles at different melting degrees obtained from the experiment, the corresponding relationship between the melting degree of Mo and 316L particles and porosity was obtained respectively, and it was compared with the results obtained by the experiment [18]
The experimental results of 316L porosity were smaller than the simulation results at a low melting degree
Summary
Porous metal has the properties of the metal itself, and has several special properties, such as high energy absorption, large specific surface area and high permeability, due to its pore structure [1,2]. Thermal-spraying methods, such as plasma spraying, flame spraying and cold spraying, have been used to prepare porous materials with different metals and pore structures by utilizing the non-compactness of particleaccumulation deposition or the volatilization characteristics of composite powders [3,4,5]. It is generally believed that solid particles are difficult to deposit due to collision and rebound during thermal spraying. The author has found that effective deposition of micro-melt or partially melted particles can be achieved by controlling the melting degree of particles by low-speed (10–30 m/s) flame spraying [6,7]. The deposition of porous materials by semi-molten spraying particles has not been reported yet
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