Fabrication of Highly Compacted Green Body Using Multi-Sized Al Powder under a Centrifugal Force
, Abilkhairkhan Aldabergen 1, Dulat Akzhigitov 1, Boris Golman 2,* and Christos Spitas 1
Round 1
Reviewer 1 Report
No discussion has been undertaken on the theory of particle sedimentation and the behavior of falling particles during centrifugal compaction, for example the issue of viscosity of the medium in which centrifugation is carried out. What is the effect of the difference in material densities on this process? The density of the aluminum is nowhere given. The explanation of the behavior of aluminum and resin particles is not justified by any theoretical basis.
The geometry of the centrifuge rotor is not shown, it is not known whether the die is tilting or is seated in its seats during centrifugation. The rotor geometry and how the containers are placed in this centrifuge are not shown. It is not known how the particles behave near the walls.
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Reviewer 2 Report
The compaction of powder of Al alloy with multi-sized particles via centrifugal casting was studied. It shows that centrifugal casting is a promising way to manufacture highly compacted green bodies using not only fine powders with a narrow particle size distribution but multi-sized powders too. Therefore, it is an effective method that can be implemented in industry.
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Reviewer 3 Report
Title: Fabrication of Highly Compacted Green Body Using Multi-Sized Al Powder Under a Centrifugal Force
* The abstract can mention about the effect of variation of the centrifugal forces on the grain size distribution of the green compact.
* Introduction: please explain fracture modulus. Please write about the effect of powder particle size on the packing density.
* Please add unit in the Figure 3. Please mention the median particle diameter with centrifugal forces.
* Please elaborate why the packing density is higher with the centrifugal force 700 G than 1800 G, Figure 7.
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Round 2
Reviewer 1 Report
This is an insufficient explanation see, for example, the work below, it is not ordinary sedimentation, please write about the factors that influence particle settling during centrifugation, e.g. wall effect, flow type, particle cloud formation, pH effect, viscosity effect. You are implying that this process is only governed by Stocks' law, and that is not true.
V. Mityushev, L. Jaworska, M. Rozmus, B. Królicka: Compaction of the diamond-Ti3SiC2 graded material by the High-Speed Centrifugal Compaction Process, Archives of Materials Science and Engineering, no 11, vol. 28, 2007, pp. 677÷682.
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