Evaluation of Novalak Resins as a precursor for fabrication of carbon – carbon composites. Part I. Optimization of curing stages
✍ Scribed by Dr. A. Sedghi; Prof. Dr. F. Golestani Fard
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 487 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0933-5137
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✦ Synopsis
Abstract
Curing of novalak resin has been investigated by applying different thermal analysis methods and solvent extraction technique. Results revealed that cure can be optimized by finding the critical steps in cure and hold resin in these steps for appropriate time. Best results were also achieved by using resins which contained lower free phenol and hexamine amount. Application of pressure is necessary in initial stages of cure but found to be harmful in the final stages. It was also found that due to the defects produced in the final stages of curing, this process cannot be completed and long time post cure should be applied on these resins. By applying a special curing regime, it was proved that defects during pyrolysis stage could be decreased profoundly and a carbon residue of more than 67 percent expected. The results are explained by emphasis on carbon – carbon applications.