Silicon carbide multilayer composites containing short carbon ﬁbres (Csf/SiC) were prepared by tape casting and pressureless sintering. C ﬁbres were dispersed in solvents and then mixed with SiC slurry to make green Csf/SiC tape. Triton X-100 was found to be the best one for Toho Tenax HTC124 ﬁbres (with water soluble coating) among BYK-163, BYK-410, BYK-2150, BYK-9076, BYK-9077 and Triton X-100 dispersants. Csf/SiC multilayer composites containing 5 vol.% ﬁbres (mean ﬁbre length of 3, 4.5, and 6 mm) were obtained. Addition of short C ﬁbres seems to worsen the densiﬁcation process in the Csf/SiC multilayer composites, whereas anisotropy shrinkage in Csf/SiC was also observed. Open pores size was increased slightly after the addition of C ﬁbre but it decreased with the mean ﬁbre length. Mechanical properties were affected by high residual porosity. The addition of short C ﬁbres has not changed the crack deﬂection at weak interfaces. Csf/SiC multilayer composites containing longer ﬁbres (4.5 and 6 mm) presented higher elastic modulus, bending strength and Vickers hardness as compared to shorter ﬁbres (3 mm). Improved sintering performance and ﬁbre content are necessary to improve mechanical properties.
|Titolo:||Fabrication of short carbon ﬁbre reinforced SiC multilayer composites by tape casting|
|Data di pubblicazione:||2012|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.ceramint.2011.08.024|
|Appare nelle tipologie:||1.1 Articolo in rivista|