Structure and composition of interlayers in joints between SiC bodies

E. Pippel, J. Woltersdorf, P. Colombo, A. Donato

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Abstract

Joints between SiC bodies (sintered α-SiC and SiC/SiCfcomposites) which are intended for thermonuclear fusion reactor applications were produced by coating their surfaces with polycarbosilane (PCS) or a silicone resin (GE SR350) alone, or mixed with SiC or Ti powders, followed by heating in an argon flux at temperatures between 900 and 1200°C applying no pressure or a very moderate one (< 0·1 MPa). The joint quality was determined by microstructural and microchemical analyses (TEM, AEM) and by fracture shear tests for comparative evaluations. For SR350, the joining material was a silicon oxycarbide glass, with no oxygen diffusion occurring between this and the SiC joined bodies. The flat interface structure and the lack of any reaction layer suggest that the joining mechanism involves the direct formation of chemical bonds between the SiC bodies and the joining material. Adding SiC or Ti powders does not improve the joining strength. Contrary to silicone resin, polycarbosilane does not serve as an effective joining material, possibly because of its different decomposition behaviour upon pyrolysls. © 1997 Elsevier Science Limited.
Original languageEnglish
Pages (from-to)1259 - 1265
Number of pages7
JournalJournal of the European Ceramic Society
Volume17
Issue number10
Publication statusPublished - Aug 1997
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites

Cite this

Pippel, E., Woltersdorf, J., Colombo, P., & Donato, A. (1997). Structure and composition of interlayers in joints between SiC bodies. Journal of the European Ceramic Society, 17(10), 1259 - 1265.