Monitoring the process of densification of 3D and 4D (tridirectional and tetradirectional) carbon/carbon composites


Autoria(s): Barbosa, C. A. L.; Pardini, L. C.; Botelho, E. C.
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

21/10/2015

21/10/2015

01/05/2015

Resumo

Carbon fiber reinforced carbon composites can be made by iterative liquid impregnation or gas phase carbon deposition routes. In both cases, at the final processing stage the carbon fiber is embedded in carbon matrix which results in unique properties such as low density, high thermal conductivity and thermal shock resistance, low thermal expansion and high modulus, in relation to other refractory materials. In the present study assembled three-directional and four-directional preforms, having 50% volume of pores, were densified by iterative cycles of thermoset resin impregnation followed by pyrolysis under inert atmosphere, until appropriate densities were achieved. The thermoset resin is converted in a carbon matrix during pyrolysis. The iterative manufacturing process of the carbon fiber reinforced carbon composites is evaluated by means of nondestructive techniques based on X-ray computed tomography and electrical resistivity. X-ray computed tomography gives a general mapping view of the filling pores of the preforms which impacts results of the electrical resistivity. After six processing cycles and heat treatments up to 2000?, the final densities of the three-directional and four-directional carbon fiber reinforced carbon composites were 1.16g/cm(3) and an electrical resistivity of approximate to 0.07m. The configuration of preforms, three-directional or four-directional, did not alter the densification profile, in terms of increasing density and reducing porosity during the processing cycles.

Formato

750-760

Identificador

http://jrp.sagepub.com/content/34/9/750

Journal Of Reinforced Plastics And Composites. London: Sage Publications Ltd, v. 34, n. 9, p. 750-760, 2015.

0731-6844

http://hdl.handle.net/11449/129504

http://dx.doi.org/10.1177/0731684415579438

WOS:000353979500007

Idioma(s)

eng

Publicador

Sage Publications Ltd

Relação

Journal Of Reinforced Plastics And Composites

Direitos

closedAccess

Palavras-Chave #Carbon #Carbon composites #Nondestructive evaluation #Aerospace materials #X-ray computed tomography
Tipo

info:eu-repo/semantics/article