Topic
Ceramic matrix composite
About: Ceramic matrix composite is a research topic. Over the lifetime, 7807 publications have been published within this topic receiving 117020 citations.
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TL;DR: In this paper, the activity of Fe-containing ceramic composites for the dehydrogenation of ethylbenzene in the presence of CO 2 was studied, and a low conversion was obtained using CaTiO 3, due to the loss of the Ca species and coke production.
Abstract: The activity of Fe-containing ceramic composites for the dehydrogenation of ethylbenzene in the presence of CO 2 was studied. Ceramic composites containing Fe, Cu, Cr, Pb and/or Ti were obtained by solid-state reaction method. The materials were characterized by XRD, textural properties, chemical analysis, SEM, Mossbauer spectroscopy, TPR, CO 2 -TPD analyses and electrical measurements. A low conversion was obtained using CaTiO 3 , due to the loss of the Ca species and coke production. The improvement of styrene selectivity with iron content, as well as the high stability of Cr 0.75 Fe 1.25 O 3 , resulted in a better activity when using this solid. Fe 2+ is continuously reoxidized to Fe 3+ by CO 2 in the Fe–Ti active phase from the Fe 0.5 Cu 0.75 Ti 0.75 O 3 sample. The latter catalyst exhibited high selectivity but limited stability towards styrene production. The ceramic composites appeared to be quite promising candidates for the dehydrogenation of ethylbenzene under CO 2 , in comparison with the conventional Fe–K doped catalysts, due to the highly stable Fe 3+ in a ceramic matrix.
33 citations
TL;DR: In this paper, carbon/carbon composites were made by pyrolysis of polymer composites composed of polyfurfuryl alcohol resin and different surface treated high modulus carbon fibres.
33 citations
TL;DR: In this paper, the authors used Spark plasma sintering (SPS) process to fabricate the samples at 1800°C for 5min under 30MPa punch pressure and vacuumed atmosphere.
33 citations
TL;DR: In this article, a 3D needle-punched carbon fiber reinforced carbon and silicon carbide (C/C-SiC) ceramic composite was analyzed using digital volume correlation to measure the local strains.
33 citations
TL;DR: In this paper, high-resolution electron microscopy (HREM) and electron energy loss (ELS) and energy dispersive X-ray (EDS) spectroscopies were used to examine the interfaces between β-SiC whiskers and α-Al2O3 matrices in composites.
Abstract: Whisker/matrix interfaces between β-SiC whiskers and β-Si3N4 or α-Al2O3 matrices in composites were examined by high-resolution electron microscopy (HREM), and electron energy loss (ELS) and energy dispersive X-ray (EDS) spectroscopies. Most whisker/matrix interfaces were crystalline, with whiskers directly bonded to matrix crystals. Some whisker/matrix interface regions contained amorphous thin films and these occurred more often in the Si3N4 composite, which contained sintering additives, than in the Al2O3 matrix composite, which did not. No evidence for light element segregation at crystalline whisker/matrix interfaces was detected by ELS or EDS at 5 nm spatial resolution. Impurities were concentrated in glassy regions in matrix grain boundaries, triple junctions, or at infrequent whisker/matrix interfaces containing amorphous films.
33 citations