Physical carbide synthesis

The steady state rates of hydrocarbon synthesis over the carbided iron surface are given in Table I. The reaction rates have been normalized to the physical surface area of the starting iron powder [18 M /g] and are reported in molecules/cm sec. A turnover... 

Whipple s rules, 20 138 Whisker reinforcement, 5 554, 555, 654 performance in ceramic—matrix composites, 5 572-575 physical properties, 5 557t synthesis, 5 642-643 and toughening, 5 622 Whiskers, silicon carbide, 22 533-534 White... 

Interest in polysilanes was reawakened in 1975, when Yajima and Hayashi found that permethylpolysilane could be transformed into silicon carbide by heating at high temperatures. Soon afterward, papers on soluble, meltable polysilanes began to appear. The literature on polysilanes has grown rapidly since that time. The early focus on the synthesis and simple characterization of polysilanes has given way to detailed physical studies of the structure of these polymers, and of their electronic and photophysical properties. 

Bandow, S., Shinohara, H., Saito, Y. etal (1993) High-yield synthesis of lanthanofullerenes via lanthanum carbide. Journal of Physical Chemistry, 97, 6101-6103. 

The bulk analysis of /3-SiC whiskers shows the least variation in chemistry. In some whiskers, the residual metals content can vary, most likely, as a result of additives that used as catalysts during synthesis. These include iron, cobalt, and chromium. Studies by Karasek et al. [56] have shown that the physical properties of silicon carbide whisker-reinforced composites do not correlate to the bulk properties of the whiskers significantly. This lack of significant correlation is mainly due to the fact that the important phase chemistry of the whisker-matrix interface is controlled by the matrix chemistry and the surface chemistry of the whiskers. There seems to be little impact of the diffusion of materials into or out of the bulk whisker material. 

State-of-the-art procedures used for the preparation of nanometer-sized carbides and nitrides are presented in this chapter, with an introduction to the most recent research in this area. This section is divided into three parts based on the physical state of substrates used for the synthesis. 

Idesaki, A., Narisawa, M., Okamura, K., Sugimoto, M., Morita, Y., Seguchi, T., Itoh, M., Application of electron beam curing for silicon carbide fiber synthesis from blend polymer of polycarbosilane and polyvinylsilane. Radiation Physics and Chemistry 2001,60(4-5), 483-487. 

Saito, Y., Synthesis and characterization of carbon nanocapsules encaging metal and carbide crystallites, in Fullerenes Recent Advances in the Chemistry and Physics of Fullerenes and Related Materials, Kadish, K. and Ruoff, R. Eds., The Electrochemical lYoceedings Series, Pennington, NJ, 1994, pp. 1419-1447, (PV 94-24). 

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