Battelle Memorial Institute.; United States. Dept. of's METALLURGY OF TUBALLOY. Progress Report to University of PDF

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2. 5. Effect of sintering parameters on densification. 2. Summary of kinetic equations for various mechanisms of initial stage sintering Sintering mechanism Neck growth Shrinkage Scale exponent 1. Lattice diffusion from grain boundary to neck x4 ¼ 16Dl s Vm a t RT  Cl Dl at   Ál Dl s Vm 1=2 1=2 ¼ t l RTa3 3 2. Grain boundary diffusion from grain boundary to neck x6 ¼ 48Db b s Vm a2 t RT 2  Cb Db b a t   Ál 3Db b s Vm 1=3 1=3 ¼ t 4 l 4RTa 4 3. Viscous flow x2 ¼ 4. Surface diffusion from particle surface to neck x7 ¼ 5.

W. and Doherty, R. , Stability of Microstructure in Metallic Systems, Cambridge University Press, Cambridge, 1976. S14. Howe, J. , Interfaces in Materials, John Wiley & Sons, New York, 1997. S15. Lupis, C. H. , Chemical Thermodynamics of Materials, Elsevier Science Publishing, New York, 1983. 34 REFERENCES 1. Sheppard, L. , Maintaining competitiveness in the age of materials, Am. Ceram. Soc. , 68, 2038–39, 1989. 2. General textbooks on thermodynamics and interfaces, such as General References from S11 to S15.

1 lists the major mechanisms of material transport and their related parameters. 1. The material transport due to the difference in interface curvature occurs under the parallel actions of various mechanisms. 1. Material transport mechanisms during sintering Material transport mechanism Material source Material sink Related parameter 1. Lattice diffusion 2. Grain boundary diffusion Grain boundary Grain boundary Neck Neck 3. 4. 5. 6. 1. 2. 3. Material transport paths during sintering. 3). Some of these material transport mechanisms contribute to densification and shrinkage while others do not.

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METALLURGY OF TUBALLOY. Progress Report to University of Chicago by Battelle Memorial Institute.; United States. Dept. of Energy.; U.S. Atomic Energy Commission. Division of Technical Information.; United States. Dept. of Energy. Office of Scientific and Technical Information


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