The Preparation and Characterization of 3D-Silica Fiber Reinforced Silica Composites

Abstract

The Preparation process of fused silica matrix composites reinforced with threedimensional (3-D) braid via liquid phase infiltration deposition was investigated. The results indicate that the densification is significantly enhanced by using infiltration process with suspension of silica and the addition of a non-ionic surfactant. The 3D SiO 2 f/ SiO 2 specimens have density of 1.65g/cm 3 , flexural strength of 75MPa. Flexural testing and scanning electron microscopy of fracture surface were used to determine mechanical properties and fracture mechanisms. Fractography reveals that the fiber and matrix interface debonding and fiber pulling-out absorb the majority of fracture energy, which is regarded as the principal reason for resulting in the pseudo ductility and toughening mechanisms of the composites.

Preparation of amorphous composites with polymer-derived silicon nitride matrix reinforced by three-dimensional silica fiber

“…Although adopting low temperature processes, such as sol-gel, slurry infiltration or electrophoretic infiltration, the continuous silica fiber reinforced silica matrix composites all exhibited relatively low strength, which was about 75 MPa or 35 MPa [2,5]. Therefore, it is a difficult problem to improve the mechanical properties of SFCMC.…”

“…In order to improve the low toughness of bulk ceramics (such as fused quartz), silica fiber reinforced ceramic matrix composites (SFCMC) have been developed during the last decades as electromagnetic window materials, including short/long silica fiber reinforced silica composites, or silica fiber reinforced phosphate composites [1][2][3]. To our knowledge, Si 3 N 4 ceramic is also a candidate material for high temperature microwave transmission due to the high mechanical strength, good thermal shock resistance, excellent resistance to rain erosion and an acceptable dielectric property [4], but to date few papers have been published on three-dimensional silica fiber reinforced silicon nitride matrix composites (3D SiO 2f /Si 3 N 4 ).…”

Ablation and radar-wave transmission performances of the nitride ceramic matrix composites

“…However, the linear ablation rate of those silica matrix composites is lower than that of the quartz glass for their low density and melting point [10] . In our previous work, the 2.5 dimensional silica fibers reinforced Si 3 N 4 -BN matrix composites with high flexural strength of 101.5 MPa were prepared by PIP method [11] , and the flexural strength is 75.8% higher than that of BN-3DX [5] and 3D SiO 2f /SiO 2 [7][8][9] . The ablation and hot radar-wave transmission performance under supersonic plasma are characterized by a range of techniques and the results are discussed in this paper.…”

“…Silica fibers, with excellent ablative resistance, thermal shock damage resistance, dielectric properties, chemical stability and flexibility, are suitable for fabricating high temperature radar windows materials, such as AS-3DX [7] , Markite 3DQ [8] and 3D SiO 2f /SiO 2 [9] . Those materials have good mechanical and dielectric properties.…”

Fabrication of High Performance 2.5D SiO2f/Si3N4‐BN Composites for High‐temperature Application

“…Silica fibers, with excellent ablative resistance, thermal shock damage resistance, dielectric properties, chemical stability and flexibility, are suitable for fabricating high temperature radar windows materials. [9][10][11] But the disadvantage of the silica fibers is that high temperature processing of typical inorganic systems will lead to serious fiber degradation. [11] Recently, three dimensional silica fibers reinforced Si 3 N 4 (3D SiO 2f /Si 3 N 4 ) ceramic composites have been prepared by Qi and his coworkers [12][13] through Preceramic polymer Impregnation Pyrolysis (PIP) methods at low temperature and the composites have good mechanical and dielectric properties while the ablation properties of the composites were not examined.…”