Hostname: page-component-76fb5796d-x4r87 Total loading time: 0 Render date: 2024-04-25T20:38:51.291Z Has data issue: false hasContentIssue false
  • English
  • Français

Interfacial Characterizations of Fiber-Reinforced Sic Composites Exhibiting Brittle and Toughened Fracture Behavior

Published online by Cambridge University Press:  25 February 2011

M. H. Rawlins ,
T. A. Nolan ,
D. P. Stinton  and
R. A. Lowden
M. H. Rawlins
Affiliation:
Oak Ridge National Lab., Oak Ridge, TN 37831
T. A. Nolan
Affiliation:
Oak Ridge National Lab., Oak Ridge, TN 37831
D. P. Stinton
Affiliation:
Oak Ridge National Lab., Oak Ridge, TN 37831
R. A. Lowden
Affiliation:
Oak Ridge National Lab., Oak Ridge, TN 37831
Get access

Abstract

A process has been developed for the fabrication of a ceramic composite of SiC fibers in a chemical vapor infiltrated (CVI) SiC matrix. Early specimens produced by this technique exhibited nonuniform fracture toughness behavior; regions of brittle fracture with no fiber pullout were interspersed with regions of good toughness where fiber pullout predominated. Microscopic and spectroscopic analyses of fiber surfaces revealed that this behavior may have been related to a thin, discontinuous layer of predominantly silica which, when present, prevented tight bonding of fibers and CVI matrix. Consequently, efforts to control interfacial bond strengths and enhance fracture toughness via fiber pretreatment with CVI overcoatings have had mixed success depending upon the overcoating specie. Chemical and microstructural characterizations by analytical electron microscopy of these composites are presented and correlated with composite mechanical property data.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 78: Symposium E – Advances in Structural Ceramics , 1986 , 223
Copyright
Copyright © Materials Research Society 1987

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

REFERENCES

1. Caputo, A.J., Lackey, W.J., “Fabrication of Fiber-Reinforced Ceramic Composites by Chemical Vapor Infiltration,” ORNL/TM-9235, Oak Ridge National Lab, Oak Ridge, TN, October 1984.CrossRefGoogle Scholar
2. Caputo, A.J., Lackey, W.J., “FAbrication of Fiber-Reinforced Ceramic Composites by Chemical Vapor Infiltration,” Ceram. Eng. & Sci. Proc., 5 [7–8] 654–67 (1984).Google Scholar
3. Caputo, A.J., Lackey, W. J., Stinton, D.P., “Development of a New, Faster Process for the Fabrication of Ceramic Fiber- Reinforced Ceramic Composites by Chemical Vapor Infiltration,” Ceram. Eng. & Sci. Proc., 6 [7–8] 694–706 (1985).CrossRefGoogle Scholar
4. Mah, T. et al., “Thermal Stability of SiC Fibers,” J. Mater. Sci. 19, 1191–1201 (1984).CrossRefGoogle Scholar
5. Sawyer, L.C. et al., Ceram. Eng. & Sci. Proc., 6 [7–8] 567–75 (1985).Google Scholar
6. Clark, T.J. et al., Ceram. Eng. & Sci. Proc., 6 [7–8] 576–88 (1985).Google Scholar