Preparation of three-dimensional silica fiber reinforced silicon nitride composites using perhydropolysilazane as precursor

High-temperature properties and associated structure evolution of continuous SiNO fiber-reinforced BN composites for wave transparency

“…In order to enhance high-temperature resistance, Semff [9] prepared continuous quartz fiber-reinforced silicon nitride-based composites by a polysilazane infiltration method. We reported a PIP (Precursor infiltration and pyrolysis) [10] process to prepare quartz fiber-reinforced silicon nitride (SiO 2f /Si 3 N 4 ) composites using perhydropolysilazane (PHPS) [11] and quartz fiber-reinforced nitride (SiO 2f /Si 3 N 4 -BN) composites using a mixture of PHPS and borazine [6]. However, the high-temperature properties of the composites mentioned above are still inadequate as a result of the quartz fibers.…”

Improved properties and microstructure of porous silicon nitride/silicon oxide composites prepared by sol–gel route

“…Silicon nitride (Si 3 N 4 ) ceramic is a promising material for high temperature used electromagnetic windows and radomes because of its excellent mechanical properties, good thermal shock resistance and excellent ablation resistance [1][2][3]. However, it has a relative high dielectric constant (5.6 for a-Si 3 N 4 and 7.9 for b-Si 3 N 4 ), which limits its wide applications [4].…”

Fabrication of yttria-stabilized-zirconia thick coatings via slurry process with pressure infiltration

“…11 Pressure infiltration, which has been successfully used to prepare dense packing of particles inside a fibre preform, [12][13][14][15] provides a possibility to improve the density of porous coatings. As long as the pores are interconnected in a sintered coating, a particle suspension can be infiltrated into the coating under an applied pressure.…”