Carbon/carbon composites with heat-treated pitches

Autor:	Joseph Dentzer, M. M. Patel, Cathie Vix-Guterl, Shri B. M. Shah, Satish M. Manocha, L.M. Manocha, P. Ehrburger
Rok vydání:	2001
Předmět:	Materials science Composite number Reinforced carbon–carbon chemistry.chemical_element General Chemistry Nitrogen Matrix (geology) chemistry Desorption Thermal medicine General Materials Science Coal tar Composite material Porosity medicine.drug
Zdroj:	Carbon. 39:673-683
ISSN:	0008-6223
Popis:	C/C composites made with carbon fibres and coal tar pitch as matrix precursor were characterised in relationship with the properties of the pitch. The influence of pitch pretreatment in nitrogen and in air on the development of porosity in the C/C composites during a first impregnation–carbonisation step is studied. The amount of voids present in the final composite as well as the pore size distribution have been determined using quantitative image analysis. Results indicate that the pretreatment in air induces a significant change in the porosity of the C/C composite since the pore size distribution of the intertow and intratow porosity becomes narrower and the fraction of closed voids increases. Thermal annealing at 2000°C of the composite also affects significantly its porosity in a way depending on the pitch properties due to the propagation of microfissures. Thermal programmed desorption of C/C composite and carbon precursors provides informations on the carbonisation behaviour of the composite and therefore confirms the results obtained by image analysis.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5305241954d72584cce20018d8192f8d https://doi.org/10.1016/s0008-6223(00)00164-0 Zobrazit plný text záznamu Full Text from ScienceDirect