Mullite Fiber Reinforced Alumina Ceramic Matrix Composites

Abstract

Mullite fiber reinforced alumina ceramic matrix composites (MFACC) were prepared using CaO-MgO-SiO2 (CMS) and TiO2 as sintering aids. The effects of the contents of sintering aids and mullite fiber on the density and sintering temperature of MFACC are studied. The results showed that when the CMS content is 8.0% and the TiO2 content is 1.0%, the density of the as-sintered MFACC is 98.9%. When the mullite fiber content is 15.0% and the sintering temperature is 1450 °C, the flexural strength of the resultant composite increases to 504.5MPa, 70.7% higher than the original matrix, and the relative density of the composites reaches 98.4%. The reinforcement mechanisms are fibers pull-out and sticky point.

Superstructure of Mullite-type KAl9O14

“…3,19 Methods for their synthesis are usually classified into solid-state, hydrothermal, and vapor-state processes. The flux method was reported as reliable for synthesis of uniform crystals.…”

“…Mullite needles, fibers, and whiskers have attracted significant attention as reinforcement material for metal and ceramic composites, enhancing their mechanical and thermal properties. , Methods for their synthesis are usually classified into solid-state, hydrothermal, and vapor-state processes. The flux method was reported as reliable for synthesis of uniform crystals .…”

Investigation on microstructure and selected properties of aluminum oxide–copper–nickel ceramic–metal composites

“…Various ceramic materials are currently used to form ceramic-metal composites, both in the monocrystalline and polycrystalline form (Pyzik et al 1987). Based on the literature data, the most common materials used for forming the ceramic matrix in composites are alumina, silicon carbide, tungsten carbide, or zirconium oxide (Włosiński 1984;Wang et al 2008;Gong et al 2019;Bucevac 2018). While the most commonly used metallic powders added to the ceramic matrix include: copper (Liu et al 2017;Yin Editorial responsibility: Fatih ŞEN.…”

Fabrication of Ni-MF/Al₂O₃ Ceramic Composites

“…The principal toughening characteristic reinforced by a second metallic phase is the dissipation of energy by plastic deformation. The fiber reinforcement has attracted more and more attention recently because it can consume much fracture energy by its high elastic modulus and strength [5]. Mullite fiber (MF) has high Young's modulus, excellent thermal stability, and similar thermal expansion coefficient to alumina ceramic.…”