Hostname: page-component-586b7cd67f-2plfb Total loading time: 0 Render date: 2024-11-27T05:31:05.687Z Has data issue: false hasContentIssue false
  • English
  • Français

Evaluation of a porous fiber coating in SiC–Si3N4 minicomposite

Published online by Cambridge University Press:  31 January 2011

Linus U. J. T. Ogbuji
Linus U. J. T. Ogbuji
Affiliation:
NYMA, NASA-Lewis Research Center, Cleveland, Ohio 44135
Get access

Abstract

A porous and discontinuous Si3N4-based fiber coating was evaluated in SiC/Si3N4 minicomposites by fiber push-out and fractography for debond capabilities following high temperature exposures. The exposures consisted of 500 h annealing at 1350 °C, and 25–100 h oxidation in wafer form at 1200–1400 °C. In spite of considerable microstructural coarsening and/or oxidation of the coating, fiber debond and sliding were achieved in all cases, and at stress levels comparable to those reported for tough, as-fabricated SiC/Si3N4 composites with a carbon or boron nitride interphase. Therefore, the porous coating is expected to perform better than C or BN in applications where oxidation is inevitable. The role of porosity in accommodating and mitigating the effects of oxidation is thought to be important.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 5 , May 1997 , pp. 1287 - 1296
Copyright
Copyright © Materials Research Society 1997

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1.Kerans, R., Jero, P., and Parthasarathy, T., Composite Sci. Technol. 51, 291–296 (1994).CrossRefGoogle Scholar
2.Fillipuzzi, L., Camus, G., and Naslain, R., J. Am. Ceram. Soc. 77 (2), 459–466 (1994).CrossRefGoogle Scholar
3.Chu, Y., Lavrentyev, A., Rokhlin, S., Baaklini, G., and Bhatt, R., J. Am. Ceram. Soc. 78 (7), 1809–1817 (1995).CrossRefGoogle Scholar
4.Morsher, G., unpublished results.Google Scholar
5.Jacobson, N. S. (private communication).Google Scholar
6.Steyer, T. E. and Zok, F. W., “Elevated Temperature Stress Rupture of SiC/SiC Composites”; paper #27-F-95P at the 47th Pacific Coast Regional Meeting of the American Ceramic Society, held Nov. 1–3, 1995, Seattle, WA.Google Scholar
7. C. A. Folsom and L. P. Zawada, “Oxidative Sealing in BN-Coated Nicalon Fiber Reinforced CMCs That Exhibit Intermediate Temperature Embrittlement”; ibid, paper #28-F-95P.Google Scholar
8.Heredia, F. E., McNulty, J. C., Zok, F. W., and Evans, A. G., unpublished results.Google Scholar
9.Carpenter, H. and Bohlen, J., in Ceramic Engineering & Science Proc., Jul–Aug. 1992, edited by Wachtman, J. (American Ceramic Society, Westerville, OH, 1992), pp. 238–256.Google Scholar
10.Davis, J. B., Lofvander, J. P., and Evans, A. G., J. Am. Ceram. Soc. 76 (5), 1249–1257 (1993).CrossRefGoogle Scholar
11.Kerans, R., unpublished.Google Scholar
12.Ogbuji, L. U., in Ceramic Engineering & Science Proc., Vol. 16, No. 4, edited by Pfendt, G. N. (American Ceramics Society, Westerville, OH, 1995), pp. 497–506.Google Scholar
13.Warwick, C. M. and Clegg, W. J., “Porous Interfaces for Ceramic Laminates,” in Proc. CIMTEC-8 (8th World Ceramic Congress), edited by Vincenzini, P., Techna, Italy (1995).Google Scholar
14.Kerans, R. J., Scripta Metall. 31 (8), 1079–1084 (1994).CrossRefGoogle Scholar
15.Ogbuji, L. U. and Opila, E. J., J. Electrochem. Soc. 142 (3), 925–930 (1995).CrossRefGoogle Scholar
16.Ginstling, A. M. and Brounshtein, B. I., Zh. Prikl. Khim. 23, 1327–1338 (1950).Google Scholar
17.Eldridge, J. I., NASA Tech. Mem. 105341, Dec. 1991.Google Scholar
18.Ogbuji, L. U., A Porous Ceramic Interphase for SiC/Si3N4 Composites, NASA Contractor Report No. 198425, November 1995.Google Scholar
19.Eldridge, J. I. and Bhatt, R., in Ceramic Matrix Composites—Advanced High-Temperature Structural Materials, edited by Lowden, R. A., Hellmann, J. R., Ferber, M. K., DiPietro, S. G., and Chawla, K. K. (Mater. Res. Soc. Symp. Proc. 365, Pittsburgh, PA, 1995).Google Scholar
20.Persson, J., Kall, P-O., and Nygren, M., J. Eur. Ceram. Soc. 12, 177–184 (1993).CrossRefGoogle Scholar
21.Mieskowski, D. M., Mitchell, T. E., and Heuer, A. H., J. Am. Ceram. Soc. 67 (1), C17–18 (1984).CrossRefGoogle Scholar
22.Ogbuji, L. U. and Singh, M., J. Mater. Res. 10, 3232–3240 (1995).CrossRefGoogle Scholar