Effect of APC addition on stability of nanosize precursors in sol–gel processing of SiC nanopowder

Najafi, Abolhassan; Golestani‐Fard, F.; Rezaie, Hamid Reza; Ehsani, N.

doi:10.1016/j.jallcom.2010.06.116

Cited by 22 publications

(12 citation statements)

References 23 publications

(25 reference statements)

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“…X-ray diffraction pattern of synthesized B4C nano powder at 1270 • C. [19]. Around 2950 cm −1 there is a band related to (C-H) bonds of methylene which keep phenol's aromatic rings in phenolic resin together [20]. The band appears around 1470 cm −1 is corresponded to stretching vibrations of B-O bonds.…”

Section: Powder Propertiesmentioning

confidence: 99%

Effect of APC addition on precursors properties during synthesis of B4C nano powder by a sol–gel process

Najafi

Golestani‐Fard

Rezaie

et al. 2011

Journal of Alloys and Compounds

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Section: Powder Propertiesmentioning

confidence: 99%

Effect of APC addition on precursors properties during synthesis of B4C nano powder by a sol–gel process

Najafi

Golestani‐Fard

Rezaie

et al. 2011

Journal of Alloys and Compounds

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“…However, the characteristic peaks of Si‐O‐Si at 1115 cm −1 and 463 cm −1 still exist in SiO 2 ‐PBO‐C 36‐38 . Moreover, the characteristic peaks of the benzene ring (1500 cm −1 ) and C‐H (827 cm −1 ) bond also exist, indicating that the structure of benzene ring has not been destroyed completely in SiO 2 ‐PBO‐C, 7,34,35 and further justifying that SiO 2 ‐PBO aerogels have superior flame retardancy, high temperature oxidation resistance.…”

Section: Resultsmentioning

confidence: 97%

“…As shown in Figure 9, there are no other absorption peaks except for the characteristic absorption peaks of -OH at 3400 cm À1 , which indicates that organic groups in PBO aerogels basically burns during the combustion process, and only the porous residual carbon and adsorbed moisture. However, the characteristic peaks of Si-O-Si at 1115 cm À1 and 463 cm À1 still exist in SiO 2 -PBO-C. [36][37][38] Moreover, the characteristic peaks of the benzene ring (1500 cm À1 ) and C-H (827 cm À1 ) bond also exist, indicating that the structure of benzene ring has not been destroyed completely in SiO 2 -PBO-C, 7,34,35 and further justifying that SiO 2 -PBO aerogels have superior flame retardancy, high temperature oxidation resistance.…”

Section: Flame-retardant Property and Speculated Mechanism Of Sio 2 -...mentioning

confidence: 98%

Excellent antioxidizing, thermally insulating and flame resistance silica‐polybenzoxazine aerogels for aircraft ablative materials

Xiao

Liu

et al. 2022

J of Applied Polymer Sci

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High‐performance thermal protective composites with lightweight, micro‐ ablation and high‐efficient thermal insulation are urgently required for thermal protection systems in advanced hypersonic speed vehicles. However, the practical applications of thermal protective composites have long been hampered by the main issues such as low mass residual rate and poor long‐term antioxidation of the matrix in high‐temperature aerobic environments. Here, we report a novel silica‐polybenz oxazine (SiO2‐PBO) aerogels with interpenetrated networks, possessing the ability to antioxidation, thermal insulation, and flame‐retardant properties. The resulting SiO2‐PBO aerogels exhibit low density (0.25 g/cm3), low thermal conductivity (0.035 W/(m·K)), and superior peak heat release rate value (15.3 W/g). Moreover, the mass residual rate is up to 70.46 wt% in the N2 atmosphere and remains 57.83 wt% despite existing in the air atmosphere and experiencing the highest temperature of 800°C. Briefly, SiO2‐PBO aerogels as‐prepared could be a potential matrix for a new gene ration of high‐performance thermal protective composites in the future.

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“…The peaks positioned at 461 and 680 cm -1 are identified as Zr-O-Zr [21] and Zr-O [22] stretching vibration, respectively. The hydrolysis and condensation reactions of TEOS motivated the peaks appeared at 820 cm -1 and 1090 cm -1 , assigning to stretching vibration of Si-O-Si bond [23,24]. The band at 1237 cm -1 is caused by B-O bond [25].…”

Section: Preparation and Characterization Of The Precursormentioning

confidence: 92%

In-situ synthesis of ultra-fine ZrB2–ZrC–SiC nanopowders by sol-gel method

Liu

Chang

et al. 2020

Ceramics International

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ZrB 2 -ZrC-SiC nanopowders with uniform phase distribution were prepared from cost-effective ZrOCl 2 •8H 2 O by a simple sol-gel method. The synthesis route, ceramization mechanism and morphology evolution of the nanopowders were investigated. ZrB 2 -ZrC-SiC ceramic precursor can be successfully obtained through hydrolysis and condensation reactions between the raw materials. Pyrolysis of the precursor was completed at 650 o C, and it produced ZrO 2 , SiO 2 , B 2 O 3 and amorphous carbon with a yield of 39% at 1300 o C. By heat-treated at 1500 o C for 2 h, highly crystallized ZrB 2 -ZrC-SiC ceramics with narrow size distribution were obtained. With the holding time of 2 h, both the crystal size and the particle size can be refined.Further prolonging the holding time can lead to serious particles coarsening. Studies

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Effect of APC addition on stability of nanosize precursors in sol–gel processing of SiC nanopowder

Cited by 22 publications

References 23 publications

Effect of APC addition on precursors properties during synthesis of B4C nano powder by a sol–gel process

Effect of APC addition on precursors properties during synthesis of B4C nano powder by a sol–gel process

Excellent antioxidizing, thermally insulating and flame resistance silica‐polybenzoxazine aerogels for aircraft ablative materials

In-situ synthesis of ultra-fine ZrB2–ZrC–SiC nanopowders by sol-gel method

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