Electric Voltage Predictions and Correlation with Density Measurements in Green-State Powder Metallurgy Compacts
Source abstract
Abstract
In this research we discuss an electrostatic measurement approach whereby electric current is injected into green-state compacts and the resulting surface voltages are recorded in an effort to determine density distributions. We present results for pure iron powder with and without lubricants compacted to various densities and their corresponding measured conductivity values, thereby clearly establishing correlation between these two entities. The electric conductivity recordings will ultimately be utilized to infer density distributions throughout the green-state P/M compact. The constant current is injected through point and aperture electrodes, and voltages are recorded along the surface of the compact. To gain confidence in the underlying physical concepts, the recorded voltages of the controlled cylindrical samples are compared with a mathematical Green's function model involving an analytical electrostatic solution of Poisson's equation.
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Research context
OpenAlex topics: Advanced Physical and Chemical Molecular Interactions · Electrostatics and Colloid Interactions · Chemical and Physical Properties of Materials
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References (19)
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1. R. M. German, Powder Metallurgy Science, Metal Powder Industries Federation, Princeton, NJ, 1984, p. 4.
2. G. Bogdanov, R. Ludwig, and W. Michalson, “A new apparatus for nondestructive evaluation of green-state powder metal compacts using the electrical-resistivity method,” J. Measurement Sci. Technol., 11:157–166 (2000).10.1088/0957-0233/11/2/308 ↗
3. J. G. Stander, J. Plunkett, D. Zenger, J. McNeill, and R. Ludwig, “Electric resistivity testing of green-state powdered metallurgy compacts,” in Review of Progress in Quantitative NDE, Vol. 16B, pp. 2005–2012, Plenum Press, New York, 1997.
4. S. Makarov, R. Ludwig, and D. Apelian, “Numerical Solution Of A Direct 3D Electrostatic Resistivity Test Of Green-State Metal Powder Compacts,” in Review of Progress in Quantitative NDE, Vol. 17B, pp. 1462–1470, Plenum Press, New York, 1998.
5. R. Ludwig, S. Makarov, and D. Apelian, “Three-dimensional solution and experimental confirmation for the electric resistivity testing of surface-breaking defects in green-state powder metallurgy compacts,” J. Nondestr. Eval., 17(2):153–166 (1998).10.1023/A:1022611131264 ↗
6. K. Ikeda, M. Yoshimi, and C. Miki, “Electric potential drop method for evaluationg crack depth, Int. J. Fracture, 47:25–38 (1991).10.1007/BF00037037 ↗
7. R. Ludwig, and D. Apelian, “A novel crack detection methodology for green-state powder metallurgy compacts using an array sensor electrostatic testing approach,” AIP Conf. Proc. Vancouver, BC, July 1999.
8. R. Ludwig et al. “Multi-probe impedance measurement system and method for detection of flaws in conductive articles,” US patent 6,218,846, April 17, 2001.
9. R. Ludwig, G. Bogdanov, and D. Apelian, “Nondestructive electro-static determination of surface breaking and subsurface flaws in green-state P/M compacts,” AIP Conf. Proc., Las Vegas, NV, June 1998.
10. J. P. Jernot, and J. L. Chermant, “On the importance of the contiguity and electrical conductivity for sintered materials,” Scripta Metall., 16:943–946 (1982).10.1016/0036-9748(82)90130-2 ↗
11. J. May, “Resistance measurement during inductive liquid phase sintering,” Planseeber. Pulvermetall. 27:207–214 (1979).
12. B. L. Mordike, J. P. Jernot, and J. L. Chermant, “Sintering of nickel powders. II. Influence of the particle size on the physical properties,” Zeitschr. Metall., 75:923–928 (1984).
13. H. A. Haus, and J. R. Melcher, Electromagnetic Fields and Energy, Prentice Hall, NJ, 1989, pp. 147.
14. P. Morse, H. Feshbach, Methods of Theoretical Physics, Vol. I, McGraw-Hill, New York, 1953, pp. 869.
15. P. Morse, H. Feshbach, Methods of Theoretical Physics, Vol. II, McGraw-Hill, New York, 1953, pp. 1252.
16. Y.-H. Kim, and S.-W. Kang, “Green's solution of the acoustic wave equation for a circular expansion chamber with arbitrary locations of inlet, outlet port, and termination impedance,” J. Acoust. Soc. Am., 94:473–490 (1993).10.1121/1.407060 ↗
17. G. N. Watson, A Treatise on the Theory of Bessel Functions, Cambridge University Press, London, 1966, pp. 132–136.
18. R. Ludwig, S. Makarov, G. Leuenberger, and D. Apelian, “Electric conductivity predictions and measurements in green-state powder metallurgy compacts,” in AIP Conf. Proc., New Orleans, May 2001.
19. Ancorsteel 1000B Data Sheet, identification #0001-AS1000-D-1, Hoeganaes Corp., Cinnaminson, NJ