Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Producing hollow article
Reexamination Certificate
2005-09-06
2005-09-06
Griffin, Steven P. (Department: 1731)
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Producing hollow article
C264S629000, C264S630000, C264S125000, C419S005000
Reexamination Certificate
active
06939505
ABSTRACT:
Channeled articles having very small diameter channels spaced very closely can be made by packing elongated cores in a fixture, clamping them, and then introducing matrix material around the cores. The matrix material is formed into a unitary body and solidified. The cores are pulled out, leaving open channels where they had been. Some core and matrix combinations will permit the cores to be pulled out. Others require a core release coating to be applied to the cores. The cores can be metal or ceramic or polymer, and the matrix can be metal or ceramic or polymer. The cores can be solid, or hollow. Rather than pulling the cores out, if they are polymer, they can be burned out. The matrix can be formed by liquid state, solid state, or hybrid liquid/solid state techniques. A related technique uses hollow cores, which are not pulled out, but which remain in the body after unification. For such tube-walled articles, the matrix can be formed similarly. Rather than insuring core release, core retention is required. Such may occur due to the nature of the materials, or a specific core retention coating may be provided. Articles made of such material include heat sinks for semiconductor devices, light-weight structural components, thermally activated actuators, etc. Very small channel diameters and very large length to opening aspect ratios can be achieved. Heat exchange fluid can be compressed and pumped through such an article at very high efficiencies, to cool semiconductor devices.
REFERENCES:
patent: 3502755 (1970-03-01), Murray
patent: 3992202 (1976-11-01), Dulis et al.
patent: 4261745 (1981-04-01), Watanabe et al.
Bowers, M. B. and Mudawar, I., “High flux boiling in low flow rate, low pressure drop mini-channel and micro-channel heat sinks,”Int. J. Heat Mass Transfer,vol. 37, No. 2, pp. 321-332, 1994, Pergamon Press Ltd., Great Britain.
Bowers, Morris B., and Mudawar, Issam, “Two-Phase Electronic Cooling Using Mini-Channel and Micro-Channel Heat Sinks: Part 1 and Part 2,” EEP-vol. 4-2, Advances in Electronic Packaging, ASME 1993, pp. 693-712.
Cole, Gregory S. and Scaringe, Robert P., “The Evolution of Microchannel Heat Transfer,” SAE Technical Paper 1999-01-1357, pp. 9-13, 1999.
Davies, G. J. and Zhen, Shu, “Metallic foams: their production, properties and applications,”Journal of Materials Science18, 1983, pp. 1899-1911.
Joo, Youngcheol, Dieu, Kiet and Kim, Chang-Jin, “Fabrication of Monolithic Microchannels for IC Chip Cooling,” IEEE Micro Electro Mechanical Systems Workshop, Amsterdam, The Netherlands, Jan.-Feb. 1995.
McDanels, David L., “Tungsten Fiber Reinforced Copper Matrix Composites,” NASA Technical Paper 2924, 1989.
Mortensen, Andreas and Cornie, James A., “On the Infiltration of Metal Matrix Composites,”Metallurgical Transactions A,vol. 18A, Jun. 1987, pp. 1160-1163.
Mortensen, Andreas, Cornie, James A. and Flemings, Merton C., “Solidification Processing of Metal-Matrix Composites,”Journal of Metal,Feb. 1988, pp. 12-19.
Rahman, Muhammed M. and Gui, Fulin, “Experimental Measurements of Fluid Flow and Heat Transfer in Microchannel Cooling Passages in a Chip Substrate,” EEP-vol. 4-2, Advances in Electronic Packaging, ASME 1993, pp. 685-692.
Rohatgi, K., Asthana, R. and Das, S. “Solidification, structures, and properties of cast metal-ceramic particle composites,” International Metal Reviews, 1986, vol. 31, No. 3, pp. 115-139.
Samalam, Vijay K., “Convective Heat Transfer in Microchannels,”Journal of Electronic Materials,vol. 18, No. 5, 1989, pp. 611-617.
Shapovalov, Vladimir, “Porous Metals,”MRS(Materials Research Society)Bulletin,Apr. 1994, pp. 24-28.
Smith, James P., “Heat Sink Offers Better Cooling,”Photonics Technology News,Laurin Publishing Co. Inc., Jan. 2000.
Sokol, Irina V. and Sundukov, Alexey M., “Production of Metal-Matrix Composite Materials,” Processing and Fabrication of Advanced Materials IV, The Minerals, Metal & Materials Society, 1996, pp. 491-498.
Tso, C.P. and Mahulikar, S.P., “Combined evaporating meniscus-driven convection and radiation in annular microchannels for electronics cooling application,” International Journal of Heat and Mass Transfer, vol. 43, 2000, pp. 1007-1023, Pergamon Press.
Weisberg, Arel, Bau, Haim H. and Zemel, J. N., “Analysis of microchannels for integrated cooling,”Int. J. Heat Mass Transfer,vol. 33, No. 10, pp. 2465-2474, 1992, Pergamon Press Ltd., Great Britain.
Eagar Thomas W.
Musso Christopher S.
Griffin Steven P.
Herring Lisa L
Massachusetts Institute of Technology
Weissburg Steven J.
LandOfFree
Methods for forming articles having very small channels... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods for forming articles having very small channels..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods for forming articles having very small channels... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3393445