Ceramic, high temperature behavior

Pezzotti, G., Tanaka, I., Okamoto, T., Si3N4/SiC-whisker composites without sintering aids III, High-temperature behavior, J. Am. Ceram. Soc., 74(2), 1991, 326-332. 

M. Schmiicker, F. Flucht and H. Schneider, High temperature behavior of polycrystalline aluminosilicate fibres with mullite bulk composition. I. Micro-structure and strength properties, J. Europ. Ceram. Soc., 16, 281-285 (1996). 

Soraru G.D., D Andrea G., Campostrini R., Babonneau F., Mariotto G. Structure characterization and high temperature behavior of silicon oxycarbide glasses prepared from sol-gel precursors containing Si-H bonds. J. Am. Ceram. Soc. 1995b 78 379-387 Schultz P.C., Smyth H.T. In Amorphous Materials, Douglas R.W., EUis B., eds. John Wiley Sons, London, England, 1972, pp. 453 61... 

Often, ceramic materials experience creep deformation as a result of exposure to stresses (usually compressive) at elevated temperatures. In general, the time-deformation creep behavior of ceramics is similar to that of metals (Section 8.12) however, creep occurs at higher temperatures in ceramics. High-temperature compressive creep tests are conducted on ceramic materials to ascertain creep deformation as a fimction of temperature and stress level. 

Holmes, J. W., and Wu, X., "Elevated temperature creep behavior of continuous fiber-reinforced ceramics." High Temperature Mechanical Behavior of Ceramic Composites, ed. Near, SVandJakus, A(1995) 193-259. 

In the present study, a current-activated pressure-assisted densification method was used to fabricate a dense zirconia - spinel ceramic. High temperature mechanical testing as well as microstructural examinations were conducted to investigate the deformation behavior of the nanocomposite produced by this method. 

Recently, a case study which addressed the high-temperature behavior of SiZ-rCNO ceramics indicated that they can also be used as precursors for preparing ultra-high temperature stable ceramic nanocomposites, i.e. p-SiC/ZrC (upon HT annealing of SiZrCNO in Ar atmosphere) and p-SijN /ZrN (upon HT annealing in nitrogen) (Linck, 2013). 

Creep. The phenomenon of creep refers to time-dependent deformation. In practice, at least for most metals and ceramics, the creep behavior becomes important at high temperatures and thus sets a limit on the maximum appHcation temperature. In general, this limit increases with the melting point of a material. An approximate limit can be estimated to He at about half of the Kelvin melting temperature. The basic governing equation of steady-state creep can be written as foUows ... 

This should come as no surprise, since the physical behavior of materials is non-linear and unpredictable, especially when materials are formulated or in combination. Two examples will suffice high temperature ceramic superconductors and insulators above their critical temperatures or at non-ideal stoichiometries composite structures may show several times the strength or impact resistance than would be expected from their component materials. Materials discovery will always require a good deal of trial and error, factors that may be mitigated by techniques that permit the simultaneous synthesis of large numbers of materials, followed by rapid or parallel screening for desired properties. 

Singh, R.N. (1993), Interfacial properties and high temperature mechanical behavior of fiber reinforced ceramic fiber reinforced ceramic composites. Mater. Sci. Eng. A 166, 185-198. 

Rouxel, T., High temperature mechanical behavior of silicon nitride ceramics, J. Ceram. Soc. Jap., 109(6) 89-98 (2001). 

High Temperature Mechanical Behavior of Ceramic Composites... 

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