Abstract
The carbon/carbon composite manufacturing processes generally use flammable and toxic precursors. In order to make these processes safer, it is interesting to use less toxic and safer precursors to the environment and people. The present study investigates the types of pyrocarbon resulting from composite carbon/carbon densification produced by the technique of Film Boiling Chemical Vapor Infiltration using as carbon precursors: soybean oil, ethanol and hexane, the latter as control. The microstructure produced was analyzed through SEM techniques, PLOM, XRD and Raman. The pyrocarbons observed are Smooth Laminar, Rought Laminar and Regenerative Laminar types. Soybean oil resulted in porous bodies while other precursors resulted in denser bodies. The crystallites made with ethanol and hexane have preferential growth in the c direction, while those made with soybean oil grow preferentially in a direction.
Highlights
The carbon/carbon composite (C/C), known as Carbon Fiber Reinforced composite (CFRC), form a class of materials with very particular applications in aerospace areas (Bokros et al 1973), such as aircraft breaks and rocket nozzles
This paper presents the result of the C/C composite manufacturing using vegetable precursors such as soybean oil and ethanol in the Film Boiling Chemical Vapor Infiltration (FB-CVI) process
According to the measurement of the extinction angle, all pyrocarbons deposited by hexane are Rough Laminar (RL), i.e., they present several crystallites with few defects (Bourrat et al 2006)
Summary
The carbon/carbon composite (C/C), known as Carbon Fiber Reinforced composite (CFRC), form a class of materials with very particular applications in aerospace areas (Bokros et al 1973), such as aircraft breaks and rocket nozzles. The use of petrochemical precursors in several countries, such as Brazil, requires compliance with specific laws related to work safety As they are carcinogens, they require additional high wages to the worker, as well as the supply of individual and collective protective equipment, including risk of major accidents due to the high flammability characteristic of the precursor (Brasil 1978). They require additional high wages to the worker, as well as the supply of individual and collective protective equipment, including risk of major accidents due to the high flammability characteristic of the precursor (Brasil 1978) Another important point is the matter of waste disposal of the process that shall be in compliance with the environmental legislation of
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