Development of silicon nitride composites with continuous reinforcement
- Georgia Institute of Technology, Atlanta, GA (United States)
Silicon nitride matrix composites are fabricated using the reaction sintering process by combining ceramic fiber with silicon powder and converting the silicon to nitride at high temperature in a nitrogen atmosphere. Critical factors in achieving good composite properties are effective impregnation of the multifilament tows, fiber stability during processing and fiber-matrix interface in the final composite. The authors form tube shapes by passing the Nicalon fiber tow through a slurry of silicon powder, winding the fiber onto a mandrel to form a unidirectional composite. As compared to the previous cloth lay-up method, this fabrication scheme produces better matrix distribution between individual filaments. Nicalon{trademark} fiber stability during processing is enhanced by CVD coating as-received fiber with layers of carbon and silicon carbide prior to slurry impregnation and winding. Flexure bar and C-ring testing produces non-brittle fracture but significant shear failure parallel to the fiber direction.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- OSTI ID:
- 140115
- Report Number(s):
- ORNL/FMP-93/1; CONF-9305135-; ON: DE94001091; TRN: 93:003927-0009
- Resource Relation:
- Conference: 7. annual conference on fossil energy materials, Oak Ridge, TN (United States), 11-13 May 1993; Other Information: PBD: Jul 1993; Related Information: Is Part Of Proceedings of the Seventh Annual Conference on Fossil Energy Materials; Fossil Energy AR and TD Materials Program; Cole, N.C.; Judkins, R.R. [comps.]; PB: 402 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Ceramic fiber coatings development and demonstration. Final technical report, 1 July 1989-31 May 1993
Strong and tough Hi-Nicalon-fiber-reinforced celsian-matrix composites