Fabrication technologies for oxide–oxide ceramic matrix composites based on electrophoretic deposition

Electrophoretic Deposition in Production of Ceramic Matrix Composites

“…Often single mats were infiltrated and subsequently pressed together. However, by considering the surface charge of the fibres and the particles, Stoll et al [36] succeeded in the preparation of the high quality, simultaneous infiltration of multiple mullite fibre mats with alumina particles. Figure 8.27 shows that full intra-tow and inter-tow infiltration was achieved, and a very compact structure with high fibre volume fraction was obtained after simultaneous infiltration.…”

“…Conversely, when fibres and particles have opposite surface charge, coagulation should occur on the first layer of fibres encountered by the travelling particle. Consequently, the formation of a deposit on the outer fibre layer will block or, at least, will hinder the movement of the particles towards the interior of the fibre mat, which could result in poor infiltration and low quality microstructure of the green body [36]. 8 …”

“…Since most of the oxide fibres are positively charged in acidic and negatively in alkaline region, both cationic and anionic depositions were used for infiltration. Stoll et al [36] prepared alumina matrices with mullite fibres. They used 25 wt.% of α-alumina powder (d = 100-300 nm) dispersed in ethanol and 4-hydroxybenzoic acid as a dispersant agent that rendered alumina particles positively charged.…”

Fabrication of CNT-SiC/SiC composites by electrophoretic deposition

“…6b, the fabric was attached to a cellulose membrane and was separated from the anode using a Teflon ® spacer. According to a mechanism proposed elsewhere, 45 with this configuration the SiC particles are forced to move through the negatively charged fibre mat to reach the electrode; thus, they first deposit on the membrane. Next, they gradually fill the fabric in front of the membrane, and finally, the deposit is additionally formed on the front side of the fabric.…”

Unidirectional all-oxide mini-composites with crack-deflecting NdPO4 interface

“…[7][8][9] As a consequence, many gas-turbine manufactures are now placing greater emphasis on the evaluation of oxide/oxide components with enhanced high temperature stability and long service life in oxidising environments. [10][11][12][13][14][15][16][17][18][19][20] Although the reinforcement fibers and matrices are brittle, the obtained composites display quasi-ductile deformation behaviour due to operation of crack deflection, fiber-matrix debonding, crack bridging and fiber pull-out mech- * Corresponding author. Tel.…”