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

Processing and Testing of RE2Si2O7 Fiber–Matrix Interphases for SiC–SiC Composites

“…(a)], but setting up precise diffraction conditions to determine their Burgers vectors was difficult due to the large lattice parameters, low crystal symmetry, and high dislocation density. The hardness of γ‐Y 2 Si 2 O 7 is comparable to monazite, a known functional fiber–matrix interphase that deforms plastically during indentation by multiple dislocation slip and deformation twinning systems, and also has several cleavage planes . The extent of plastic deformation by dislocation glide in indented γ‐Y 2 Si 2 O 7 appears similar to that in monazite [Figs.…”

Current Status of Oxide Fibre-Reinforced Oxide Ceramic Matrix Composites for Gas Turbine Applications

“…Composite manufacturing. The materials, reinforcement fibres, fibre coating technology and composite processing were reported recently in detail [2][3][4]. α-alumina powder with an average particle size of 160 nm and surface area of 14.3 m 2 /g was used as the matrix material.…”

“…Dip-coated fibre bundle is impregnated with nano-size alumina ceramic particles by electrophoretic deposition (EPD) using a deposition voltage of 10 V for 3 min. The details of the technique can be found elsewhere [1][2][3]. Coated and electrophoretically deposited fibre bundles were then put in a polymer-based tube with an inner diameter of 4 mm.…”

“…Continuous fibre reinforced ceramic matrix composites (CMCs) have emerged as leading candidates in gas-turbine applications and power generation systems where future requirements for increased operating temperature, reduction in weight and in exhaust emissions are becoming difficult to meet using conventional metallic alloys [1,2]. The physical and mechanical properties of new generation oxide/oxide CMCs enable innovative solutions for problems with materials in thermal protection systems and liners in gas turbine engines, rocket engine, hot gas filter technologies, fire prevention, catalytic converters, soot filters and medical applications [3][4][5].…”

Electrophoretic Deposition in Production of Ceramic Matrix Composites

“…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. Alumina-mullite composites were also prepared by Kaya et al [39], who used mullite fibres coated with a crack-deflecting layer of NdPO 4 . Nanosized alumina powder (d 50 = 160 nm) was dispersed in distilled water with addition of Mullite-alumina fibre mats, previously coated with a layer of AlPO 4 (weak interphase layer), were used also to reinforce reaction bonded mullite matrix [40].…”