Development of performing pitch for carbon-carbon composites from coal based percursors
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Literature survey The literature survey is prepared by M.R. Alexander, C. Barren, J. Collins, M.D. Glendenning and A.J. Hosty, University of Shefield, UK Autoclave curing--comparisons of model and test results Ciriscioli, P.R., Wang, Q. and Springer, G.S. Journal of Composite Materials Vol 26 No I (1992) pp 90-102 The temperature, ionic conductivity and compaction in 16 to 200 ply thick graphite- epoxy laminates made of T300/976 (tape or fabric) or Hercules AS/3501-6 (tape) were measured. A comparison of results was made with calculations from the Loos-Springer CURE model. Good agreement was found suggesting that the technique can be used to select the cure cycle. It is shown that manufacturers recommended cure cycles may lead to excessive temperatures and incomplete compaction and cannot be used to make thick or even moderately thick composites. Development of preforming pitch for carbon- carbon composites from coal based precursors Aggarwal, R.K., Bhatia, G. and Bahl, O.P. Journal of Materials Science Vol 25 No 11 (1990) pp 4604-4606 A process for the production of a preforming pitch for the fabrication of carbon-carbon composites is described. The effects of the various experimental variables on the final pitches produced have been studied. Field trials were also carried out allowing the specification of the charcteristics of a pitch capable of producing carbon-carbon com- posites with densities of 1.8 g cnm3. Estimation of thermal properties in carbon/ epoxy composite materials during curing Scott, E.P. and Beck, J.V. Journal of Composite Materials Vol 26 No 1 (1992) pp 20-36 A technique for estimating the thermal response properties of thermoset composites during curing is given. The technique involves the minimisation of a least squares function made up of measured and calculated transient temperatures. An experimental model is presented to determine the relationships between the thermal properties, temperature and degree of cure. Hypothetical data obtained from the experimental design is used to demonstrate the estimation procedure. Excellent agreement was found between the thermal properties estimated using simulated data and those used to generate this data. Fabrication of SIC whisker reinforced AI,O, composites Yang, M. and Stevens, R. Journal of Materials Science Vol25 No I1 (1990) pp 4658-4666 The conditions required for the wet mixing of SIC whiskers and alumina are described such that the slip can be cast to a high green density. Subsequent sintering was found to be difficult due to the formation of whisker networks and differential sintering stresses. Densification could be achieved by hot pressing and the effects of pressure, temperature and whisker content on the densification rate were studied. Composites Manufacturing No. 2 1992 131
Transcript of Development of performing pitch for carbon-carbon composites from coal based percursors
Literature survey The literature survey is prepared by M.R. Alexander, C. Barren, J. Collins, M.D. Glendenning and A.J. Hosty, University of Shefield, UK
Autoclave curing--comparisons of model and test results Ciriscioli, P.R., Wang, Q. and Springer, G.S. Journal of Composite Materials Vol 26 No I (1992) pp 90-102
The temperature, ionic conductivity and compaction in 16 to 200 ply thick graphite- epoxy laminates made of T300/976 (tape or fabric) or Hercules AS/3501-6 (tape) were measured. A comparison of results was made with calculations from the Loos-Springer CURE model. Good agreement was found suggesting that the technique can be used to select the cure cycle. It is shown that manufacturers recommended cure cycles may lead to excessive temperatures and incomplete compaction and cannot be used to make thick or even moderately thick composites.
Development of preforming pitch for carbon- carbon composites from coal based precursors Aggarwal, R.K., Bhatia, G. and Bahl, O.P. Journal of Materials Science Vol 25 No 11 (1990) pp 4604-4606
A process for the production of a preforming pitch for the fabrication of carbon-carbon composites is described. The effects of the various experimental variables on the final pitches produced have been studied. Field trials were also carried out allowing the specification of the charcteristics of a pitch capable of producing carbon-carbon com- posites with densities of 1.8 g cnm3.
Estimation of thermal properties in carbon/ epoxy composite materials during curing Scott, E.P. and Beck, J.V. Journal of Composite Materials Vol 26 No 1 (1992)
pp 20-36
A technique for estimating the thermal response properties of thermoset composites during curing is given. The technique involves the minimisation of a least squares function made up of measured and calculated transient temperatures. An experimental model is presented to determine the relationships
between the thermal properties, temperature and degree of cure. Hypothetical data obtained from the experimental design is used to demonstrate the estimation procedure. Excellent agreement was found between the thermal properties estimated using simulated data and those used to generate this data.
Fabrication of SIC whisker reinforced AI,O, composites Yang, M. and Stevens, R. Journal of Materials Science Vol25 No I1 (1990) pp 4658-4666
The conditions required for the wet mixing of SIC whiskers and alumina are described such that the slip can be cast to a high green density. Subsequent sintering was found to be difficult due to the formation of whisker networks and differential sintering stresses. Densification could be achieved by hot pressing and the effects of pressure, temperature and whisker content on the densification rate were studied.
Composites Manufacturing No. 2 1992 131
