By Suk-Joong L. Kang, Rajendra Bordia, Eugene A. Olevsky, Didier Bouvard
This ebook presents a great one-stop source for realizing an important present concerns within the examine and advances in sintering technological know-how and technology.Content:
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Additional info for Advances in Sintering Science and Technology II: Ceramic Transactions, Volume 232
Sella, J. C. , 28 327-333 (1980). H. Garofalini, S. Conover, 'Comparison between bulk and surface self-diffusion constants of Si and O in vitreous silica', J. Non-Cryst. Solids, 74 171-176 (1985). I3 R. B. Bird, W. E. Stewart, E. N. Lightfoot, Transport phenomena, John Wiley, New-York, 2001. I4 R. A. Svehla, Technical Report TR R-132, NASA, Lewis Research Center, Cleveland, Ohio, 1962. |3 Z. A. Munir, 'Analytical treatment of the role of surface oxide layers in the sintering of metals', J. Mater.
5 sample microstructure is homogeneous over the compact with large grains (2-5 μπι) surrounded by coarser pores (5-10 μιη). The final density of the compact is 65 % of the theoretical density. Φ15 sample microstructure is non-uniform as observed by Shaw and Heuer<2) and Möller and Welsh <3'. A relatively dense inner core (80-85 % density from image analysis) with afinegrain size (-200 nm) is surrounded by a region of coarse grain size and porosity (-65 % density from image analysis). The global density of the compact is 76 % of the theoretical density.
The temperature of the furnace was measured by a Pt-10%Rh (S type) thermocouple placed below the crucible. The working gases flows were individually regulated using mass flow controllers. Calcinations experiments were carried out using dry air at constant flow following a heating rate of 15°C/min up to 650°C followed by a ramp up to 1100°C at a heating rate of 5°C/min. The experiments were finished by cooling down the furnace until room temperature keeping the dry air atmosphere. On the other hand, the reduction experiments were carried out using calcinated samples in a mixture of Ar/5%H2 atmosphere at constant flow.