J. Mater. Sci. Technol. ›› 2020, Vol. 43: 189-196.DOI: 10.1016/j.jmst.2019.10.029
• Research Article • Previous Articles Next Articles
Nersisyan Hayk H.a, Kwon Suk Cheolb, Ri Vladislav E.b, Kim Wan Baeb, Choi Woo Seokb, Lee Jong Hyeonab*()
Received:
2019-08-02
Revised:
2019-10-01
Accepted:
2019-10-22
Published:
2020-04-15
Online:
2020-04-26
Contact:
Hyeon Lee Jong
Nersisyan Hayk H., Kwon Suk Cheol, Ri Vladislav E., Kim Wan Bae, Choi Woo Seok, Lee Jong Hyeon. Formation of spherical alloy microparticles in a porous salt medium[J]. J. Mater. Sci. Technol., 2020, 43: 189-196.
Fig. 2. Morphologies of AlSi12 particles. (A) Effect of annealing temperature: (a) 660 °C; (b) 700 °C; (c) 750 °C; (d) 810 °C; (k = 0.4, rNaCl<100 μm). (B) Effect of NaCl particle size: (a) rNaCl≥500 μm; (b) 150≤rNaCl ≤250 μm; (c) 50≤rNaCl ≤150 μm; (d) rNaCl ≤50 μm (k = 1.37, T = 750 °C). (C) Effect of NaCl concentration (k): (a) 0.15; (b) 0.4; (c) 0.8; (d) 1.37 (50≤rNaCl ≤150 μm, T = 750 °C).
Fig. 3. (A) Particle size distributions obtained by LPSA analysis; (B) Mean diameter of Al/Si particles according to process parameters. (a) Moles of NaCl; (b) Heat-treatment temperature; (c) Particle size of NaCl.
Fig. 4. (a) XRD patterns of spherical particles: (1) Al powder; (2, 3) Al/Si alloy powder prepared with 0.43 mol NaCl having 150-250 μm and <50 μm particles size; (b) Surface polished AlSi12 particle; (c) EDS spectra of AlSi12 powder with elements concentration and map.
Fig. 5. SEM micrographs of Al and its alloy particles: (a) pure Al (T = 750 °C, salt-NaCl); (b) Al/Si particles (T = 700 °C, salt-KCl); (c) Al/Si/Cr/Cu alloy (T = 750 °C, salt-NaCl); (d) Al/Si (T = 850 °C, salt-NaF); (e) Al/Mg (T = 750 °C, salt-NaCl); (f) Al/Mg (T = 700 °C, salt-NaCl).
System | Current Method | Gas atomization [ | |||
---|---|---|---|---|---|
d50 (μm) | ρ (g/cc) | f (s/50 g) | ρ (g/cc) | f (s/50 g) | |
Al precursor | 80 | 1.35 | No flow | - | - |
Al | 45 | 1.65 | 48 | - | - |
AlSi12 | 165 | 1.6 | 57 | - | - |
AlSi12 | 95 | 1.6 | 50 | - | - |
AlSi12 | 58 | 1.65 | 48 | 1.05 | 72.2 |
AlSi12 | 50 | 1.6 | 48 | 1.28 | 65.4 |
Table 1 The mean diameter, bulk density and flow rate of spherical Al and Al-Si particles.
System | Current Method | Gas atomization [ | |||
---|---|---|---|---|---|
d50 (μm) | ρ (g/cc) | f (s/50 g) | ρ (g/cc) | f (s/50 g) | |
Al precursor | 80 | 1.35 | No flow | - | - |
Al | 45 | 1.65 | 48 | - | - |
AlSi12 | 165 | 1.6 | 57 | - | - |
AlSi12 | 95 | 1.6 | 50 | - | - |
AlSi12 | 58 | 1.65 | 48 | 1.05 | 72.2 |
AlSi12 | 50 | 1.6 | 48 | 1.28 | 65.4 |
Type | Pure Al | Al/Si eutectic alloy |
---|---|---|
A1 | 2.22749 | 1.01111 |
A2 | 2.67287 | 2.75639 |
L1 | 645.72664 | 2106.55825 |
L2 | 635.3015 | 578.0147 |
h1 | -0.00167 | -0.000537 |
h2 | -0.02281 | -0.51692 |
p | 0.61766 | 0.93398 |
Span (A2-A1) | 0.44538 | 1.74528 |
Table 2 Coefficients for regression equations on the temperature-dependent density of pure Al and Al/Si eutectic alloy.
Type | Pure Al | Al/Si eutectic alloy |
---|---|---|
A1 | 2.22749 | 1.01111 |
A2 | 2.67287 | 2.75639 |
L1 | 645.72664 | 2106.55825 |
L2 | 635.3015 | 578.0147 |
h1 | -0.00167 | -0.000537 |
h2 | -0.02281 | -0.51692 |
p | 0.61766 | 0.93398 |
Span (A2-A1) | 0.44538 | 1.74528 |
Fig. 7. (a) Pseudo-2D initial mesh describing the distribution of salt and aluminum; (b) temperature increase vs. time; (c) calculated phase distribution of aluminum with increasing and decreasing temperature.
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