ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Non-oxide ceramic SiCN possesses unique physical and chemical properties, which makeit a suitable material for various applications such as catalyst support, high temperaturesemiconducting devices, and metal or polymer matrix composites. In this work, SiCN foams withpore size of 500 and 1000 nm and high BET surface area of 184.5 and 71 m2/g were prepared usingpreceramic polymer, polyvinylsilazane, as a precursor and polystyrene sphere packed bed as aself-sacrificial template. The polystyrene sphere packed bed was prepared by the naturalsedimentation of spheres. After the infiltration and curing of viscous preceramic polymer, the samplewas pyrolyzed at 1000 ºC under N2 atmosphere to produce the ceramic foams. It is a very simplesynthesis because in the process of pyrolysing preceramic polymer, the polystyrene sphere templatewas removed simultaneously by pyrolysis with no additional etching step. SEM, N2adsorption-desorption measurement and TGA were used to characterize the obtained samples. It wasconcluded from the TGA measurement that the obtained SiCN foam possessed very high thermalstability at 1000 ºC under air
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.727.pdf
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