Continuous silica fiber reinforced silica composites densified by polymer-derived silicon nitride: Mechanical properties and microstructures

Qi, Gongjin; Zhang, C.R.; Hu, Haifeng

doi:10.1016/j.jnoncrysol.2006.06.015

Cited by 22 publications

(17 citation statements)

References 14 publications

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“…3 shows the FTIR spectra of the ball-milled powders. All samples had the peaks at around 470, 800 and 1090 cm À1 , which are corresponding to the bending vibration, symmetrical stretching and asymmetrical stretching of Si-O-Si bond, respectively [3,11,23]. The peaks at 1640 and 3460 cm À1 are corresponding to the bending vibration of absorbed water and the independent stretching of O-H bond, respectively [8,24].…”

Section: Methodsmentioning

confidence: 99%

“…For space aircraft, critical properties (such as good mechanical and dielectric properties, excellent thermal shock and ablation resistance) are required for the material of its radome and antenna windows. Fused SiO 2 is one of the candidates which can fulfill the requirements [3]. And it is worthwhile to note that the amorphous status of fused SiO 2 is one of the key factors related with its properties.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the devitrification and microwave penetrating properties of fused silica

Zhu

Pan

et al. 2009

Journal of Non-Crystalline Solids

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of the devitrification and microwave penetrating properties of fused silica

Zhu

Pan

et al. 2009

Journal of Non-Crystalline Solids

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“…As AlCl 3 was introduced, it first reacted with NaBH 4 to form Al(BH 4 ) 3 . [24] Al(BH 4 ) 3 reacted with (NH 4 ) 2 SO 4 more readily and rapidly than NaBH 4 . Consequently, when AlCl 3 was introduced, the reaction proceeded vigorously even at 45°C.…”

Section: Reaction Of Sodium Borohydride With Ammonium Sulfate Catalyzmentioning

confidence: 96%

“…[21,22] A catalytic mechanism of AlCl 3 for the reaction of NaBH 4 with (NH 4 ) 2 SO 4 was proposed on the basis of the observed presence of Al(BH 4 ) 3 (Scheme 1). Scheme 1. Early experiments showed that Al(BH 4 ) 3 was formed in trace amounts when the NaBH 4 and AlCl 3 solutions in tetraglyme were mixed together in a mol ratio of 3NaBH 4 / AlCl 3 . When the NaBH 4 and Al 2 (SO 4 ) 3 solutions in tetraglyme were mixed together in a mol ratio of 6NaBH 4 / Al 2 (SO 4 ) 3 , Al(BH 4 ) 3 was also formed in trace amounts.…”

Section: Reaction Of Sodium Borohydride With Ammonium Sulfate Catalyzmentioning

confidence: 99%

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An Improved Synthesis of Borazine with Aluminum Chloride as Catalyst

Zhang

et al. 2010

Eur J Inorg Chem

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Borazine is an excellent precursor for boron nitride. However the existing synthetic methods for the preparation of borazine have drawbacks such as relatively high reaction temperatures, side reactions, long reaction times, and low yields. An improved synthesis procedure was disclosed, which involved the use of aluminum chloride as a catalyst in the reaction of sodium borohydride with ammonium sulfate. The aluminum chloride catalyst brought the reaction temperature down from 120–140 °C to 45 °C. Improved yields of borazine were obtained in comparison to the reaction without a catalyst. In addition, the reaction process was investigated in detail by 11B NMR spectroscopy and Fourier transform infrared spectroscopy (FTIR). It was found that aluminum borohydride formed in very small quantity when aluminum chloride was introduced, which plays an important role in the reaction.

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Facile synthesis of a novel transparent melt‐spinnable polysilazane

Chen

Kao

et al. 2021

Nano Select

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In this study, a novel colorless and transparent polysilazane (PSZ) with excellent spinnability was facilely synthesized via the thermal polymerization of silazane oligomer at 330℃. The silazane precursor was fabricated by one‐step copolycondensation of methyldichlorosilane (CH3SiHCl2) and dimethyldichlorosilane ((CH3)2SiCl2) in various ratios at 0℃ without catalyst during the reaction. The chemical composition, molecule structure, molecular weight and ceramic yield of PSZ were investigated by gel permeation chromatography (GPC), Fourier transform infrared (FT‐IR), thermogravimetric analysis (TGA) and pyrolysis chromatography‐mass spectrometry (PY‐GC/MS). The optimized novel transparent melt‐spinnable PSZ was a colorless and transparent brittle solid with a Mw = 14,231 and a melting point of 100℃, which was prepared with an optimal molar ratio of raw materials at 1.9:1 (CH3SiHCl2: (CH3)2SiCl2). Fibers with various diameters were spun using a homemade melt spinning setup at 90–120°C. The obtained PSZ showed outstanding spinnability, and the prepared continuous fibers exhibited a uniform diameter (10–80 microns) and a smooth surface up to 1000 meters long. In addition, possible polymerization mechanisms of PSZ were also discussed. The PSZ showed the excellent rheological properties in melt‐spinning as a potential precursor for Si3N4 fibers. The novel optically transparent polysilazane material also have great potential applications in optical technology and engineering.

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Continuous silica fiber reinforced silica composites densified by polymer-derived silicon nitride: Mechanical properties and microstructures

Cited by 22 publications

References 14 publications

Investigation of the devitrification and microwave penetrating properties of fused silica

Investigation of the devitrification and microwave penetrating properties of fused silica

An Improved Synthesis of Borazine with Aluminum Chloride as Catalyst

Facile synthesis of a novel transparent melt‐spinnable polysilazane

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