Metal powder absorptivity: modeling and experiment

C. D. Boley; S. C. Mitchell; A. M. Rubenchik; S. S. Q. Wu

doi:10.1364/AO.55.006496

Applied Optics
Vol. 55,
Issue 23,
pp. 6496-6500
(2016)
•https://doi.org/10.1364/AO.55.006496

Metal powder absorptivity: modeling and experiment

C. D. Boley, S. C. Mitchell, A. M. Rubenchik, and S. S. Q. Wu

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C. D. Boley, S. C. Mitchell, A. M. Rubenchik, and S. S. Q. Wu, "Metal powder absorptivity: modeling and experiment," Appl. Opt. 55, 6496-6500 (2016)

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- Lasers and Laser Optics
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About this Article
History
- Original Manuscript: May 16, 2016
- Revised Manuscript: July 18, 2016
- Manuscript Accepted: July 19, 2016
- Published: August 10, 2016

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Abstract

We present results of numerical modeling and direct calorimetric measurements of the powder absorptivity for a number of metals. The modeling results generally correlate well with experiment. We show that the powder absorptivity is determined, to a great extent, by the absorptivity of a flat surface at normal incidence. Our results allow the prediction of the powder absorptivity from normal flat-surface absorptivity measurements.

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Material	$λ$ (μm)	$Re (n)$	$Im (n)$	A (Flat Surface)	A (Hexagonal)	A (Gaussian)	A (Bimodal)
Ag	1	0.23	7.09	0.018	0.13	0.082	0.13
Au	1	0.278	7.2	0.021	0.14	0.094	0.14
Cu	1	0.35	6.97	0.028	0.16	0.12	0.17
Al	1	1.244	10	0.047	0.22	0.18	0.24
Ta	1	0.95	5.3	0.12	0.35	0.32	0.38
Pb	1	1.35	5.67	0.14	0.39	0.36	0.36
Sn	1	3.6	7.464	0.19	0.45	0.42	0.42
Ni	1	2.88	5.26	0.27	0.54	0.51	0.56
U	1	1.95	4.1	0.31	0.57	0.55	0.59
SS	1	3.27	4.48	0.34	0.60	0.58	0.63
V	1	2.88	3.71	0.40	0.65	0.63	0.67
Ti	1	3.47	4	0.39	0.64	0.62	0.66
Ti	0.45	2.33	3.1	0.45	0.69	0.67	0.71
W	1	2.9	3.745	0.40	0.65	0.63	0.67
W	0.50	3.4	2.7	0.51	0.73	0.71	0.75

Material	$A_{0}$	$A_{1}$	$Δ A_{1}$
Pure Al	0.53	$- 2.6 E - 05$	$2.0 E - 05$
Al 6061	0.58	$- 1.2 E - 04$	$7.8 E - 05$
Co-Cr-Mo	0.64	$- 6.0 E - 06$	$1.5 E - 05$
Inconel-625	0.67	$- 4.8 E - 05$	$3.2 E - 05$
SS (316L)	0.68	$- 7.1 E - 05$	$1.5 E - 05$
SS (Nitronic 40)	0.70	$- 7.4 E - 05$	$1.6 E - 05$
SS (Mo-45-HC)	0.76	$- 5.4 E - 05$	$1.3 E - 05$
Ti-6Al-4V	0.74	$- 7.6 E - 05$	$1.4 E - 05$
W	0.81	$- 6.9 E - 05$	$1.7 E - 05$

Material	$λ$ (μm)	$Re (n)$	$Im (n)$	A (Flat Surface)	A (Hexagonal)	A (Gaussian)	A (Bimodal)
Ag	1	0.23	7.09	0.018	0.13	0.082	0.13
Au	1	0.278	7.2	0.021	0.14	0.094	0.14
Cu	1	0.35	6.97	0.028	0.16	0.12	0.17
Al	1	1.244	10	0.047	0.22	0.18	0.24
Ta	1	0.95	5.3	0.12	0.35	0.32	0.38
Pb	1	1.35	5.67	0.14	0.39	0.36	0.36
Sn	1	3.6	7.464	0.19	0.45	0.42	0.42
Ni	1	2.88	5.26	0.27	0.54	0.51	0.56
U	1	1.95	4.1	0.31	0.57	0.55	0.59
SS	1	3.27	4.48	0.34	0.60	0.58	0.63
V	1	2.88	3.71	0.40	0.65	0.63	0.67
Ti	1	3.47	4	0.39	0.64	0.62	0.66
Ti	0.45	2.33	3.1	0.45	0.69	0.67	0.71
W	1	2.9	3.745	0.40	0.65	0.63	0.67
W	0.50	3.4	2.7	0.51	0.73	0.71	0.75

Material	$A_{0}$	$A_{1}$	$Δ A_{1}$
Pure Al	0.53	$- 2.6 E - 05$	$2.0 E - 05$
Al 6061	0.58	$- 1.2 E - 04$	$7.8 E - 05$
Co-Cr-Mo	0.64	$- 6.0 E - 06$	$1.5 E - 05$
Inconel-625	0.67	$- 4.8 E - 05$	$3.2 E - 05$
SS (316L)	0.68	$- 7.1 E - 05$	$1.5 E - 05$
SS (Nitronic 40)	0.70	$- 7.4 E - 05$	$1.6 E - 05$
SS (Mo-45-HC)	0.76	$- 5.4 E - 05$	$1.3 E - 05$
Ti-6Al-4V	0.74	$- 7.6 E - 05$	$1.4 E - 05$
W	0.81	$- 6.9 E - 05$	$1.7 E - 05$

Abstract

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Applied Optics