Processing-structure-property relationships of ceramic-fiber-reinforced Si-C-O matrix composites
Continuous-fiber-reinforced Si-C-O matrix composites were fabricated and their processing-structure-property relationships were investigated in this project. A Si-C-O matrix was formed by converting polycarbosilane into a mixture of very fine-grained beta-silicon carbide, silicon oxide, and excess carbon through a pyrolysis process. Three types of continuous fibers, which are mullite fiber (Nextel 312), carbon fiber, and silicon carbide (Nicalon) fiber, were used to reinforce the Si-C-O matrix. In order to prevent the catastrophic failure and improve the performance of these ceramic composites, two types of pyrolytic-carbon thin film were coated on the fiber surface to prevent the reaction between fiber and matrix. However, carbon may not be an ideal fiber-coating material if oxidation resistance is a concern. Therefore, alternatives such as Si{sub 3}N{sub 4}, BN, B, TiC, ZrC, and Al{sub 2}O{sub 3} ceramic materials were considered and evaluated based on their physical and thermodynamic compatibility with both the fiber and the matrix. Mechanical properties and failure mechanisms of composites with and without carbon coating on the fiber surface are compared.
- Research Organization:
- Auburn Univ., AL (United States)
- OSTI ID:
- 5332409
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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