B{sub 4}C coated carbon fibre reinforced Si{sub 3}N{sub 4}
- Univ. of Groningen (Netherlands); and others
The quality of long, pitch-based carbon fibre reinforced Si{sub 3}N{sub 4} composites prepared by slurry infiltration and hot-pressing were assessed from mechanical properties combined with acoustic emission. Typical room temperature load vs. deflection curves were measured. Macro- and microstructural observations with optical microscopy, X-ray powder diffraction and scanning, transmission and high resolution electron microscopy are presented. The amount of {alpha} to {beta} transformation of the Si{sub 3}N{sub 4} matrix, and the amount of SiC as reaction product were determined by XPD. The composition of the interfacial crack surfaces were analysed by energy dispersive X-ray and parallel electron energy loss spectroscopy. The results were focused on composites reinforced with carbon fibres precoated with a B{sub 4}C and a Cpyr/B{sub 4}C coating. The effects of such coatings on the load transfer at the fibre/matrix interface are discussed. Composites with B{sub 4}C coated fibres exhibit a higher crack toughness - with some reduction in strength - than composites with uncoated fibres or Cpyr/B{sub 4}C coated fibres.
- OSTI ID:
- 567460
- Report Number(s):
- CONF-960106-; TRN: 98:000276-0013
- Resource Relation:
- Conference: 20. annual conference on composites, advanced ceramics, materials and structures-B, Cocoa Beach, FL (United States), 7-11 Jan 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the 20th annual conference on composites, advanced ceramics, materials, and structures - B; Greenhut, V.; PB: 465 p.
- Country of Publication:
- United States
- Language:
- English
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