Carbon fiber growth kinetics and thermodynamics using temperature controlled LCVD

Autor:	Chad E. Duty, W.J. Lackey, Daniel L. Jean, R. Johnson, Scott N. Bondi
Rok vydání:	2002
Předmět:	Analytical chemistry General Chemistry Activation energy Chemical vapor deposition Methane Chemical kinetics chemistry.chemical_compound chemistry Etching Reagent Deposition (phase transition) Physical chemistry General Materials Science Total pressure
Zdroj:	Carbon. 40:1435-1445
ISSN:	0008-6223
DOI:	10.1016/s0008-6223(01)00307-4
Popis:	The chemical kinetics of carbon fiber deposition using Laser Chemical Vapor Deposition (LCVD) was studied. Using methane as the precursor at a total pressure of 78.4 kPa, the activation energy was 176 kJ/mol and the order of the reaction was 3.47. Using propylene as the primary reagent at a total pressure of 21.3 kPa, the activation energy was 286 kJ/mol and the order of the reaction was 1.90. The values are based on measured temperatures ranging from 1720 to 2170 °C. The cause of volcano shaped deposits was also explored through experimentation and thermodynamic modeling, and found to be an etching reaction induced by the elevated temperatures at the center of the laser spot.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8d034ec43b722379ee42385277043c78 https://doi.org/10.1016/s0008-6223(01)00307-4 Zobrazit plný text záznamu Full Text from ScienceDirect