By Suk-Joong L. Kang, Rajendra Bordia, Eugene A. Olevsky, Didier Bouvard
This booklet presents an exceptional one-stop source for figuring out an important present concerns within the examine and advances in sintering technological know-how and technology.Content:
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Example text
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. The reduction samples were heated from room 26 - Advances in Sintering Science and Technology II Synthesis of Polycrystalline Sr2Fe1+XMo1-X06 Samples Produced by Solid-State Reaction temperature up to 1100°C at heating rate of 5°C/min. The reduction gas mixture was kept throughout the experiment in order to avoid oxidation of the reduced sample during the cooling process of the furnace.
In a previous work <8), neck growth rates for two particles of radius a connected with a neck of radius x, were estimated using the formalism introduced by Ashby (l0) . The main results are summarized below for the two distinct cases (Figure 1): - Pure silicon A non-densifying mechanism, surface diffusion, controls sintering kinetics at all temperatures. - Silicon particles covered with a silica layer of thickness ε$ι0 Surface diffusion is strongly impeded. As the silicon surface diffusion coefficient, Ds{3) is replaced by the surface diffusion coefficient of silicon on silica, A,,* x,o,> '"' ' 2 ) · t n e nec^ growth rate is divided by ~1016.
H. Rosolowski, 'Sintering of Covalent Solids', J. Am. Ceram. Soc, 59 7-8 (1976). 2 N. J. Shaw, A. H. , 31 55-59 (1983). 3 H. J. Möller, G. Welsch, "Sintering of Ultrafine Silicon Powder', J. Am. Ceram. Soc, 68 320-325 (1985). ''W. M. Robertson, "Thermal Etching and Grain-Boundary Grooving of Silicon Ceramics', J. Am. Ceram. Soc, 64 9-13 (1981). 5 W. S. Coblenz, 'The Physics and Chemistry of the Sintering of Silicon', J. Maler. , 25 2754-2764 (1990). 52 · Advances in Sintering Science and Technology II Sintering of Silicon, Effect of the Sample Size on Silica Reduction Kinetics and Densification 6 Y.