Effect of Aggressive Environments on Mechanical Performance of Fibre Ceramic Composites
Abstract
Based on the experimental observation, the results clearly indicate that weight of C/C-SiC composite is damaged severally at about 2% and 2D C/C composite damaged nearly 12% when oxidised in open atmosphere by the flame of oxy-acetylene gas. The changes in microhardness, XRD pattern and thermal properties are appeared because of delamination, debonding, pyrolysis of matrix and formation of CO, CO2 and SiO2. Therefore, maximum tensile and compressive stress of ceramic composites decreased with the oxidation time in open atmosphere by oxyacetylene gas flame. Also, SiC ceramic coating on 4D carbon composites resulted that the carbon-carbon composite temperature predicts the oxidation kinetic is severe after 1273K. This was due to formation of smooth silicon carbide film phases covering the surface of the composite. Which is less volatile and showed lower oxygen permeability, and consequently acted as an effective oxygen diffusion barrier? The whole study shows that a combination of both silicon and carbon based materials system is more useful for elevated oxidation protection of carbon-carbon composites.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2007
- Accession Number
- ADA473112
Entities
People
- Vijay K. Srivastava
Organizations
- Banaras Hindu University