Laser-induced sintering of powders has become prevalent in a number of Solid Freeform Fabrication technologies such as Selective Laser Sintering (SLS), which is used to produce nearly solid parts from initially-porous powder via laser irradiation. In this paper, a model is presented which can be used to predict the shape and general features of consolidated heat affected zones produced by laser-induced, non-isothermal sintering of polymer powder. Comparisons between experimental results and predictions are made, and the model is used to investigate the influence of various thermal processing parameters on the sintering operation. The model is then extended to simulate the manufacture of a simple multiple layer part which is produced in a manner similar to SLS.

Issue Section:
Research Papers
Topics:
Engineering models, Lasers, Polymers, Sintering, Heat, Irradiation (Radiation exposure), Shapes, Stereolithography
1.
Bird, R. B., Stewart, W. E., and Lightfoot, E. N., 1960, Transport Phenomena, John Wiley & Sons, Inc., New York.
2.
Conley
J. G.
, and
Marcus
H. L.
,
1997
, “
Rapid Prototyping and Solid Freeform Fabrication
,”
ASME JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING
, Vol.
119
, pp.
811
–
816
.
3.
Cook, G. A., 1961, Argon, Helium, and the Rare Gases, Interscience Publishers, New York.
4.
Cutler
I. B.
,
1969
, “
Sintering of Glass Powders During Constant Rates of Heating
,”
J. Amer. Ceram. Soc.
, Vol.
52
, pp.
14
–
17
.
5.
Devereux, D. B., 1993, Design and Development of a Technique for Measuring Radiative Properties of Dielectric Powder, M.S. thesis, University of Texas at Austin, Austin, TX.
6.
Hanamura, K., and Kumada, M., 1995, “Radiant Flash Melting of Micron Polymer-Particles,” Proc. 1st Int. Symp. on Radiation Heat Transfer, M. Pinar Mengu¨c¸, ed., Kusadasi, Turkey, pp. 682–689.
7.
Kandis
M.
, and
Bergman
T. L.
,
1997
, “
Observation, Prediction, and Correlation of Geometric Shape Evolution Induced by Non-Isothermal Sintering of Polymer Powder
,”
ASME Journal of Heat Transfer
, Vol.
119
, pp.
824
–
831
.
8.
Kuczynski
G. C.
,
1949
, “
Study of Sintering of Glass
,”
J. Appl. Phys.
, Vol.
20
, pp.
1160
–
1163
.
9.
Nelson
J. C.
,
Xue
S.
,
Barlow
J. W.
,
Beaman
J. J.
,
Marcus
H. L.
, and
Bourell
D. L.
,
1993
, “
Model of Selective Laser Sintering of Bisphenol-A Polycarbonate
,”
Ind. Eng. Chem. Res.
, Vol.
32
, pp.
2305
–
2317
.
10.
Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, Hemisphere Publishing Company, Washington.
11.
Scherer, G. W., 1992, “Constitutive Models for Viscous Sintering,” Mechanics of Granular Materials and Powder Systems, M. M. Mehrabadi, ed., ASME MD-Vol. 37, pp. 1–18.
12.
Torrence
K. E.
,
1979
, “
Natural Convection in Thermally Stratified Enclosures with Localized Heating from Below
,”
J. Fluid Mech.
, Vol.
95
, pp.
477
–
495
.
13.
Venkatu
D. A.
, and
Johnson
D. L.
,
1971
, “
Analysis of Sintering Equations Pertaining to Constant Rates of Heating
,”
J. Amer. Ceram. Soc.
, Vol.
54
, p.
641
641
.
14.
Voller
V.
, and
Cross
M.
,
1981
, “
Accurate Solution of Moving Boundary Problems Using the Enthalpy Method
,”
Int. J. Heat Mass Transfer
, Vol.
24
, pp.
545
–
556
.
15.
Whitaker, S., 1977, A Theory of Drying in Porous Media, Advances in Heat Transfer, J. P. Hartnett and T. F. Irvine, Jr., eds., Academic Press, pp. 119–203.
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