ISSN:
1662-0356
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Allgemeine Naturwissenschaft
,
Technik allgemein
Notizen:
Hot pressing is an effective way to densify powder compacts, especially during theinclusion of a second phase, such as particles, whiskers or fibers. In the present study, SiC/SiC andC/SiC composites were prepared by hot pressing via liquid phase sintering. Nano-SiC powder wasused for matrix formation with sintering additives. The effects of preparation conditions such assintering temperature, pressure and matrix composition, on the microstructural evolution andmechanical behaviors were discussed. Using micro-SiC powder and nano-SiC powder for matrixformation, the interaction between fiber and matrix was characterized. Because the matrixcompositions can be easily modified in the CMC-processing from powders by hot pressing, theSiC-BN matrix was also studied in the present experiment. The inclusion of BN can either improvethe machinability or provide oxidation resistance to the composite. BN was derived through an in-situreaction between boron acid and urea by hot-pressing. Boric acid and urea were solved into theethanol and mixed with nano-SiC particles, and then infiltrated into the fiber bundles. Correlationsamong microstructures, properties and compositions will be discussed
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.50.75.pdf
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