Preparation and Properties of Yttrium Silicate Interfacial Phase of SiO2f/SiO2 Wave-Transmitting Composites
For the poor toughness and low strength of quartz fiber-reinforced SiO2 ceramic-based wave-transmitting materials,the sol-gel method was used to prepare yttrium silicate interfacial phases that combined toughness,brittleness,strength and wave-transmitting properties of composites.The effects of sintering temperature and number of impregnation on the bending strength of the composites were investigated,and their bending strength,toughness and wave-transmitting properties were characterized.The results show that the pure SiO2f/SiO2 has the best performance after having been impregnated and sinteried for 7 times at 700 ℃,with the bending strength,fracture energy and dielectric constant being 18.53 MPa,9.336 × 10-4 J and 3.2,respectively.After the introduction of the interfacial phase,with the interfacial phase impregnated and sintered for two times and the silica sol impregnated and sintered for three times,the properties of the composite were significantly improved,their bending strength,fracture energy and dielectric constant increasing to 34.15 MPa,3.997 × 10-3J and 2.8,respectively.The study provides some theoretical reference for the research on and development of interfacial phases of wave-transparent ceramics.
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