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|Type:||Artigo de periódico|
|Title:||Ceramic matrix composites derived from CrSi2-filled silicone polycyclic network|
|Abstract:||Ceramic matrix composites (CMC) were prepared by the active-filler-controlled polymer pyrolysis, using a siloxane polycyclic network filled with CrSi2. The starting CrSi2-filled polysiloxane was pyrolyzed in both nitrogen and argon atmospheres, up to 1450degreesC. During the pyrolysis in nitrogen atmosphere, the CrSi2 particles reacted with N-2, and also with carbon from the preceramic polymer binder, still complete consumption of the filler particles. Such reactions led to a dramatic change in the composition and microstructure of the resulting ceramic monoliths, which displayed linear expansion of 1.7%. In argon atmosphere, the CrSi2 particles acted as inert filler during the pyrolysis process. The final CMC compositions obtained in N-2 and Ar atmospheres were Cr0.62C0.25N0.03-Si3N4-Cr3C2 and SiOxCy-SiC-CrSi2, respectively. (C) 2004 Kluwer Academic Publishers.|
|Editor:||Kluwer Academic Publ|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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