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UHTC composites processing

Basic property evaluation of UHTCs and UHTC composites has resumed at a number of government facilities within NASA and the military, as well as at some universities. " With this resurgence in basic research, investigations into UHTC carbides and nitrides are seeing added attention as new processing techniques make the fabrication of these materials easier. [Pg.220]

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. [Pg.83]

Jayaseelan, D. D., Guimaraes de Sa, R., Brown, P, Lee, W. E. (2011). Reactive infiltration processing (RIP) of ultra high temperature ceramics (UHTC) into porous C/C composite tubes. Journal of the European Ceramic Society, 31,361-368. doi 10.1016/j.jeurceramsoc.2010.10.013. [Pg.118]

In summary, RMI is a promising fabrication route for ultra high temperature ceramic matrix composite. Further efforts should be made to perfect the RMI process. It is believed that RMI can emerge as a low cost process to provide high performance C/UHTC components for ultra high temperature applications in the future. [Pg.346]

Formation of a ZrB -ZrC-SiC UHTCs matrix is therefore possible using a polymeric precursor solution and by PIP process. XRD results of the prepared C/C-ZrBj-ZrC-SiC composite are shown in Figure 6, which shows a complete formation of composited hexagonal ZrB, cubic ZrC and SiC with high crystallinities at 1500 °C. Diffractions of carbon (peak of 002 with 2 theta of 26) are from fiber and interphase. It was also found that formation temperatures can be further decreased by about 50 100°C via co-pyrolysis with PCS as compared independent pyrolysis of ZrC-ZrB precursors. [Pg.426]

In the previous chapter, preparation process and microstructure investigation of a novel C/C-ZrB -ZrC-SiC composite were reported, in which polymeric precursors of ZrB2-ZrC were used to fabricate an ultra-high temperature ceramics (UHTCs) matrix for the first time but with the traditional polymeric precursor infiltration and pyrolysis (PIP) technique. The formed ZrB -ZrC-SiC complex matrix exhibits homogeneous dispersion of nano-sized ZrB and ZrC particles in continuous SiC ceramic all with particle dimensions less than 200 nm. This kind of composite... [Pg.436]


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