Ultra high temperature ceramics properties

M. Gasch, D. Ellerby, E. liby, S. Beckman, M. Gusman, and S. Johnson, Processing, Properties and Arc Jet Oxidation of Hafnium Diboride/Silicon Carbide Ultra High Temperature Ceramics, J. Mater. Sci., 39, 5925-5937 (2004). 

F. Monteverde, Progress in the Fabrication of Ultra-High-Temperature Ceramics In Situ Synthesis, Microstructure and Properties of a Reactive Hot-Pressed HfB2-SiC Composite, Comp. Sci. Tech., 65, 1869-79 (2005). 

Ceramic borides, carbides and nitrides are characterized by high melting points, chemical inertness and relatively good oxidation resistance in extreme environments, such as conditions experienced during reentry. This family of ceramic materials has come to be known as Ultra High Temperature Ceramics (UHTCs). Some of the earliest work on UHTCs was conducted by the Air Force in the 1960 s and 1970 s. Since then, work has continued sporadically and has primarily been funded by NASA, the Navy and the Air Force. This article summarizes some of the early works, with a focus on hafnium diboride and zirconium diboride-based compositions. These works focused on identifying additives, such as SiC, to improve mechanical or thermal properties, and/or to improve oxidation resistance in extreme environments at temperatures greater than 2000°C. 

Gasch, M., Ellerby, D., Irby, E., Beckman, S., Gusman, M. and Johnson, S., Processing and Properties of Hafnium Diboride/Silicon Carbide Ultra High Temperature Ceramics, To be published in J. of Materials Science (2003). 

PROCESSING, MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ULTRA HIGH TEMPERATURE CERAMICS FABRICATED BY SPARK PLASMA SINTERING... 

Processing, Microstructure and Mechanical Properties of Ultra High Temperature Ceramics... 

Ceramics and composites for engine applications Design and life prediction methodologies Environmental effects on mechanical properties Mechanical behavior of porous ceramics Reliability of small scale systems Ultra high temperature ceramics Ternary compounds... 

Ultra High Temperature Ceramics Processing, Properties, and Applications. 49... 

Table 1. Basic physical and mechanical properties possessed by the various ultra high temperature ceramics [Cutler, 1991, Telle, 1994, Cotton, 2010, Basu, 2006, Fahrenholtz, 2007, Pierrat, 2010]...

Having looked into and critically analyzed some of the processing issues, property requirements and more recently developed advanced composites based on the ultra-high temperature ceramics, in this section we summarize the various applications (current and potential) of these material classes. As has been emphasized in the preceding sections, UHTCs are nsed for applications that demand withstanding temperatures above 2000°C, along with harsh atmospheric conditions. Such conditions are typically enconntered dnring the re-entry of space shuttles into the atmosphere. Hence, a lot of research on UHTCs has been conducted with such applications in mind. 

Bellosi, A., Monteverde, F. (2006). Ultra-high temperature ceramics Microstructure control and Properties improvement related to materials design and Processing procedures. Proceedings 5 European Workshop on Thermal Protection Systems and Hot Structures, Noordwijk, The Netherlands (pp. 17 - 19) (ESA SP-631, August 2006). 

Monteverde, F. (2005). ftognessinthe fabrication of ultra-high-temperature ceramics in situ synthesis, microstructure and properties of a reactive hot-pressed HfB - SiC composite. Comp. Sci. Tech.,65,1869-1879.doi 10.1016/j.compscitech.2005.04.003. 

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