Measurement of the dimension changes of carbon artifacts during graphitization in a pilot LWG furnace

Perruchoud, Raymond C.; Fischer, Werner K.; Letizia, I.

doi:10.7209/tanso.2011.168

Cited by 1 publication

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“…Therefore a number of experimental methods and techniques can be used for monitoring and measuring the progress of the heat treatment processes related to the convertion of a pristine phenolic resin/carbon fiber composite into a CFRC composite. For instance, weight changes during heat treatment of carbon materials can be monitored by thermogravimetric techniques, and dimensional changes can be monitored by dilatometric techniques 14 . Electrical resistivity has long been used as technique for monitoring and quality control of several important industrial process, such as graphite manufacturing and SiC manufacturing [15][16][17] .…”

Section: Introductionmentioning

confidence: 99%

Electrical Behavior of Carbon Fiber/Phenolic Composite during Pyrolysis

et al. 2015

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Carbon fiber reinforced carbon (CFRC) composites, also called carbon/carbon (C/C) composites are materials with superior characteristics such as low density, good thermal shock resistance, high strength and low ablation under severe environments. Due to their properties, CFRC composites are ideal candidate in the high temperature fields. By pyrolysis process, carbon fiber phenolic resin composites are converted in C/C composites. The phenolic resin is a non-conductor (electrical resistivity of 1012 Ω.m) and during heat treatment of carbon fiber phenolic resin composite, it is converted to a carbon matrix (a conductor). This conversion was accomplished by electrical resistivity measurements using four-probe method according to ASTM C611-98 with final electrical resistivity of 0.04 mΩ.m. Microstructure of carbon fiber phenolic resin composite was assessed by using optical microscopy and image analysis. Pore volume was evaluated and the results were compared with thermal gravimetric analyses. The values of activation energy (Ea) during pyrolysis were 1.153kJ.mol -1 and 10.860kJ.mol -1.

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Section: Introductionmentioning

confidence: 99%