2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 8: Composite & Ceramic, Quasi-crystals and Nanomaterials
| Editors: | Kongoli F, Pech-Canul M, Kalemtas A, Werheit H |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 300 pages |
| ISBN: | 978-1-987820-31-7 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Fabrication of C/C Composite by Using Activated Carbon Solid Inert Carburizing Atmosphere
Hasan Yesilyurt1; M Halidun Kelestemur1; Enbiya Turedi2;1MELIKSAH UNIVERSITY, Kayseri, Turkey; 2KOCAELI UNIVERSITY, Kocaeli, Turkey;
Type of Paper: Regular
Id Paper: 400
Topic: 18
Abstract:
Fabrications of 2D, 3D, 4D or randomly distributed carbon fiber reinforced carbon matrix, C/C ceramics, composites exhibiting high thermal and stable mechanical properties at high temperature have been extensively studied for few decades. The viscous resin or powder mixture, which are already determined, can be used for the matrix material and the particular fiber arrangement such as 2D, 3D etc. could be formed. The mixtures of fiber and matrix can be carburized directly at certain temperature, or pre-form can be formed before carburization under the proper pressure or into some casting mold according to solid or liquid matrix materials. However, carbonization process should be carried out in controlled atmosphere which could be argon, nitrogen or vacuum environment, since carbon has poor exudation resistance during the carburization heat treatment. In this study, the solid preform, which is made up of randomly distributed carbon fiber, carbon black, phenolic resin and binder, has been formed under moderate pressure and temperature. 150-300oC of the temperature ranges are studied for preforming. The preform product obtained has carburized in the solid atmosphere instead of the gas flow controlled atmosphere or vacuum environment which is commonly preferred ones. The method using solid inert atmosphere during carburization step in open air furnace is the unique part of the study which is totally different than the conventionally known methods requiring controlled gas atmosphere or vacuum systems. In this scope, the pre-formed semi-product which has formed at warm temperature, 150-300oC, with moderate pressure is subjected to the carburization process in the created solid inert environment in open air furnace at 5 oC/min heating rate and 1100-1150oC carburization temperature. The semi-preform product consists of mixture of solid carbon powder and carbon fiber in 20, 25, 30, 35, 40 percent. 30–35% porosity occurs in carburized products following the pyrolysis process in which solid activated carbon inert bath is used. 5-10 cycles of impregnation processes have been applied by using a solution of furfuryl alcohol and tartaric acid. The carburization process with 5oC/min heating rate at 1100 oC for 20 hours duration has been repeated after each impregnation cycles. The density and porosity changes are measured according to the ASTM C20 following the impregnation. EDX and SEM examinations are performed on the produced carbon-carbon composite structure samples for microstructural analysis.