Effects of processing parameters on the fabrication of near-net-shape fibre reinforced oxide ceramic matrix composites via sol–gel route

In situ observation of the deformation and fracture of an alumina-alumina ceramic-matrix composite at elevated temperature using x-ray computed tomography

“…The microstructure of the Nextel 720 fibre/alumina matrix ceramic matrix composite is similar to that reported by Tandon et al [24]. The inherent matrix porosity and defects are caused by matrix shrinkage during processing [9,25]. The elastic moduli in Table 2 were estimated using the cross-head displacement, and so are not necessarily accurate, but the oxide/oxide composites, albeit in the lower range [26].…”

Porous hydroxyapatite scaffolds fabricated from nano-sized powder via honeycomb extrusion

“…Spherical particles have been demonstrated to attain the highest packing density in ceramic fabrication processes [332], and were successfully attained when powders were calcined at 1000 °C. Therefore, less organic constituents will need extracting from the extrudates, and thereby reducing chances of larger voids and inhomogeneous shrinkage that consequently result in the formation of defects [406][407][408][409]. In addition, the calcined powders consisted of particles with a wider size distribution, which again has been proven to augment particle packing [229,332].…”

Sol–gel approach to near-net-shape oxide–oxide composites reinforced with short alumina fibres—The effect of crystallization

“…Finally, infiltrations were carried out with the sols of viscosity 5 AE 1 mPa s which helped to minimize matrix cracking and improve mechanical strength of CMCs [17]. It is to be noted that most of the interconnected pores and voids of the fibre preform were filled with the sol of higher viscosity followed by filling of residual pores and voids with the sol of lower viscosity.…”