Composites silicon carbides

Isothermal Infiltration. Several infiltration procedures have been developed, which are shown schematically in Fig. 5.15.P3] In isothermal infiltration (5.15a), the gases surround the porous substrate and enter by diffusion. The concentration of reactants is higher toward the outside of the porous substrate, and deposition occurs preferentially in the outer portions forming a skin which impedes further infiltration. It is often necessary to interrupt the process and remove the skin by machining so that the interior of the substrate may be densified. In spite of this limitation, isothermal infiltration is used widely because it lends itself well to simultaneous processing of a great number of parts in large furnaces. It is used for the fabrication of carbon-carbon composites for aircraft brakes and silicon carbide composites for aerospace applications (see Ch. 19). 

Singh, R.N. and Gaddipati. A.R. (1991). A uniaxially reinforced zirconia-silicon carbide composite. J. Mater. Sci. 26, 957. 

Meschke, F., Alves-Riccardo, P., Schneider, G.A. and Claussen, N. Failure behavior of alumina and alumina/silicon carbide composites with natural and artificial flaws , J. Mat. Res. 12 (1997) 3307-3315. 

Turan, S. and Knowles, K.M., (1995), A comparison of the microstructure of silicon nitride-silicon carbide composites made with and without deoxidized starting material , J. Microscopy, YU (3), 287-304. 

Yu, Z.B., Krstic, Z. and Krstic, V.D., (2005), Laminated silicon nitride/silicon carbide composites with self-sealed structure , Key Engineering Materials 280-283, 1873-1876. 

R. N. Singh, High-Temperature Mechanical Properties of a Uniaxially Reinforced Zicon-Silicon Carbide Composite, J. Am. Ceram. Soc., 73[8], 2399-2406 (1990). 

L. X. Han and S. Suresh, High Temperature Failure of an Alumina-Silicon Carbide Composite under Cyclic Loads Mechanisms of Fatigue Crack-Tip Damage, J. Am. Ceram. Soc., 72[7], 1233-1238 (1989). 

Many nonoxide ceramics form gaseous reaction products when oxidized. For example, when an alumina/silicon carbide composite is exposed to an oxidizing environment, SiC will oxidize, forming carbon monoxide via the following reaction ... 

Precursors for Silicon Nitride/Silicon Carbide Composites.455... 

V. PRECURSORS FOR SILICON NITRIDE/SILICON CARBIDE COMPOSITES... 

Based on this approach, families of silicon carbide fiber and silicon ceramic composites are now being routinely produced based on polycarbosilane precursors [22] These new materials are finding a wide range of new applications, for example, as a hot zone component in the next generation turbojets where silicon carbide composite components now routinely service at operating temperatures well in excess of 1000°C under high static thrusts (up to 50,000 psi) and high sonic pressure (up to 800 DB). No metallic components survive under these conditions. 

Snead LL, Jones RH, Kohyama A, Fenici P (1996) Statue of silicon carbide composites for fusion. J Nucl Mater 233-237 26-36... 

Figure 6.6. Columnar SiC in carbon-fibre-reinforced silicon carbide composites [18]...

Silicon Carbide Composites Fabricated by Nano-infiltrated Transient Eutectoid Process, Fusion Eng. Des., 61-62, 723-31 (2002). 

Y. Katoh, T. Nozawa, L.L, Snead, T, Hinoki, and A. Kohyama, Property Tailorability for Advanced CVl Silicon Carbide Composites for Fusion, Fusion Eng. Des., 81, 937-44 (2006). 

R. Scholz, F. Dos Santos Marques, and B. Riccardi, Electrical Conduciiviiy of Silicon Carbide Composites, J. Nucl. Mater., 307-311, 1098-101 (2002). 

K. W. Chew, A. Sellinger, R.M. Laine, processing aluminium nitride-silicon carbide composites via polymer infiltration and pyrolysis of polymethyl silane, a precursor to stoichiometric silicon carbide, J. Am. Ceram. Soc., 82, 857-866 (1999)... 

JOINING AND INTEGRATION OF ADVANCED CARBON-CARBON AND CARBON-SILICON CARBIDE COMPOSITES TO METALLIC SYSTEMS... 

Joining and Integration of Carbon-Carbon and Carbon-Silicon Carbide Composites... 

M-J. Pan, Microcracking Behavior of Particulate Titanium Diboride-Silicon Carbide Composites and Its Influence on Elastic Properties, Ph.D. Thesis, The Pennsylvania State University, 1994. 

Luthra, K.L., M.K. Bran, and G.S. Corman. 1994. Protective coatings with reactive interlayer on reinforcement in silicon carbide composite. U.S. PATENT 5,294,489, 1994 March 15. 

Dense SiC platelet reinforced silicon carbide composites were recently fabricated [52]. The highest sintered densities of 97-98% TD were achieved with 20% platelet contents using hot molding as the thermoplastic forming technique [53]. 

Carbon Fibre Reinforced Silicon Carbide Composites (C/SiC, C/C-SiC)... 

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