Abstract
Metal injection molding (MIM) is a near net-shape process that offers the unique ability to manufacture porous components with homogeneous porosity, pore structure and permeability. MIM is a process that can significantly reduce production cost when large quantities of components with complex shape need to be delivered. In this study, MIM is used to produce porous 316L stainless steel structure from both water and gas atomized powders. The porous components made by MIM were characterized to evaluate their suitability for small pore structure applications. The porous structures were analyzed for porosity, pore size, permeability, and thermal conductivity as a function of powder type and processing conditions. A typical MIM powder (<20 μm) processed at 50 vol% loading in a binder system produced a uniform pore structure with a permeability of less than 1⋅10− 13 m2 and a maximum pore radius of less than 5 μm. Water-atomized powder proved to be better suited for low-solids-loading metal injection molding (<50 vol% loading) since its irregular shape provided greater strength and fewer defects during the molding and debinding process steps. Measurements of thermal conductivity show that the water-atomized powder had less thermal conductivity (∼2 W/m-K) than the gas-atomized powder (∼3 W/m-K). This study shows that MIM is a suitable process that can be used to manufacture functional porous structures that require isotropic pore size and complex shape.
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References
J. C. DUDDY, in US patent # 3,266,893, Method for the Manufacturing Porous Sinterable Articles (August 16, 1966).
D. F. HEANEY and R. M. GERMAN, in “Advances in Powder Metallurgy and Particulate Materials, New Orleans, La, May 2001,” compiled by W. B. Eisen and S. Kassam., (Metal Powder Industries Federation, NJ Princeton, 2001) p. 8.
D. E. DIMLA and H. SINGH, in Third National Conference on Rapid Prototyping, Tooling, and Manufacturing, High Wycombe, UK, 20-21 June 2002, edited by A. E. W. Rennie, C. E. Bocking D. M. Jacobson (Professional Engineering Publishing Limited, 2002) p. 115.
D. W. RICHERSON, in “Modern Ceramic Engineering, Properties, Processing and Use in Design,” 2nd edn. Revise and Expanded (Marcel Dekker, Inc, New York, NY, 1992).
R. M. GERMAN, in “Advances in Powder Technology,” edited by G. Y. Chin (American Society for Metals, Metals Park, OH, 1982) p. 225.
M. EISENMANN, in “Powder Metal Technologies and Applications” (ASM Handbook, Materials Park, OH, ASM International, c1998) Vol. 7, p 1031.
R. M. GERMAN and R. G. CORNWALL, Metal Powder Report 56(2) (2001) 22.
R. M. GERMAN and A. BOSE, “Injection Molding of Metal and Ceramic” (Metal Powder Industries Federation, NJ Princeton, 1997).
H. I. BAKAN, D. F. HEANEY and R. M. GERMAN, J. Powder Metall. 44(3) (2001) 235.
D. HEANEY, Metal Powder Report 57(6) (2002) 32.
C. BINET, D. F. HEANEY, J. C. PIEMME and P. BURKE, in “Advances in Powder Metallurgy and Particulate Materials,” Orlando, Fl, June 2002, compiled by V. Arnhold, C.-L. Chu, W. F. Jandeska H. I. Sanderow (Metal Powder Industries Federation, NJ Princeton, 2002) p. 10.
C. KAI and L. FAI, “Rapid Prototyping: Principles and Applications in Manufacturing” (John Wiley & Sons, 1997).
Guidance Document for Testing Orthopedic Implants with Modified Metallic Surfaces Apposing Bone or Bone Cement, Orthopedic Devices Branch, Division of General and Restorative Devices, Office of Device Evaluation, Center for Devices and Radiological Health, U.S. Food and Drug Administration, 1994, April 28, http://www.fda.gov/cdrh/ode/827.html
G. SRIKANTH, Membrane Separation Processes—Technology and Business Opportunities, http://www.tifac.org.in/news/memb. htm
R. M. GERMAN, “Powder Metallurgy Science” (Metal Powder Industries Federation, NJ Princeton, 1994).
S. LOWELL and J. E. SHIELDS, “Powder Surface Area and Porosity,” 3rd ed. (Chapman & Hall, London, New York, 1991) p. 46
J.-H. CHOI, I.-S. AHN, Y.-C. BAK, S.-Y. BAE, S.-J. HA and H.-J. JANG, Powder Techn. 140 (2004) 98.
Filter-Elements High Porosity Sintered Materials SIKA-R?IS, GKN Sinter Metals, http://www.pyramidfilters.com/Assets/images/PorousAxial.pdf
D. R. POIRIER and G. H. GEIGER, “Transport Phenomena in Materials Processing” (The Minerals, Metals & Materials Society, PA Warrendale, 1994) p. 208.
A. V. LUIKOV, A. G. SHASHKOV, L. L. VASILIEV and Y. E. FRAIMAN, J. Heat Mass Transf. 11 (1966) 117.
P. GROOTENHUIS, R. W. POWELL and R. P. TYE, Proc. Phys. Soc. B65 (1952) 502.
J. S. AGAPIOU and M. F. DEVRIES, J. Heat Transf. 111 (1989) 281.
M. I. AIVAZOV and I. A. DOMASHNEV, Poroshkovaya metallurgiya 8(9) (1968) 51.
J. C. KOH and A. FORTINI, Int. J. Heat Mass Transf. 16 (1973) 2013.
MPIF Standard Test Methods, Standard 46, Determination of Tap Density of Metal Powders, issued 1981.
D. R. LIDE, in “CRC Hanbook of Chemistry and Physics” (CRC Press, DC Washington, 80th ed., 1999–2000) p. 6, 6.
J. FRANCL and W. KINGERY, J. Am. Ceram. Soc. 37(2) (1954) 80.
M. BAUCCIO (ed.), in “ASM Metals Reference Book,” 3rd ed. (ASM International, Materials Park, OH, 1993) p. 360.
S. M. SWEENEY and M. J. MAYO, J. Am. Ceram. Soc. 82(7) (1999) 1931.
S. V. BELOV, O. G. KATUESOV and V. M. POLYAEV, Soviet Powder Met. Metal Ceram. 11 (1972) 733.
A. BIRNBOIM, T. OLORUNYOLEMI and Y. CARMEL, J. Am. Ceram. Soc. 84 (2001) 1315.
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Heaney, D.F., Gurosik, J.D. & Binet, C. Isotropic forming of porous structures via metal injection molding. J Mater Sci 40, 973–981 (2005). https://doi.org/10.1007/s10853-005-6516-1
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DOI: https://doi.org/10.1007/s10853-005-6516-1