Anti-oxidation and ablation properties of carbon/carbon composites infiltrated by hafnium boride

Li, Hejun; Yao, Dongjia; Fu, Qiangang; Liu, Lei; Zhang, Yulei; Yao, Xiyuan; Wang, Yongjie; Li, Hailiang

doi:10.1016/j.carbon.2012.09.053

Cited by 96 publications

(16 citation statements)

References 17 publications

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“…Applying the ceramic coating on C/C composites is an effective method to improve the ablation resistance of C/C composites [4,5]. ZrB 2 -SiC ultra-high temperature ceramics (UHTC) exhibits good anti-ablation property at high temperature.…”

Section: Introductionmentioning

confidence: 99%

SiC nanowire toughened ZrB2–SiC ablative coating for SiC coated C/C composites

Zhang

Yang

Zhang

et al. 2015

Ceramics International

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Section: Introductionmentioning

confidence: 99%

SiC nanowire toughened ZrB2–SiC ablative coating for SiC coated C/C composites

Zhang

Yang

Zhang

et al. 2015

Ceramics International

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“…Спектр 13 С ЯМР (CD3OD), δC, м.д. : 116,11 (С 2,3,5,6 ); 150,20 (С 1,4 ). ИК спектр, ν, см -1 : 756; 831; 1211; 1367; 1471; 1515; 1597; 3000-3600.…”

Section: экспериментальная частьunclassified

“…Решением отмеченной проблемы может являться модификация фенолформальдегидных смол на основе гидрохинона. Первый способ -это введение структуры с более высокой термостойкостью, такой как имидная группа, триазиновое кольцо и полисульфон; второй способ -введение соединений, содержащих неорганические элементы, такие как бор [4], кремний [5], фосфор [6,7], цирконий [8], титан [9] и т.д., которые имеют хорошие антиокислительные свойства.…”

Section: Introductionunclassified

Synthesis and Properties of Boron-Containing Oligomers Based on Hydroquinone and Boric Acid

Lenskiy¹,

Novitskiy²,

Корабельников³

et al. 2020

IVKKT

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By polyesterification of boric acid with hydroquinone in o-xylene with azeotropic distillation of water, polyesters of hydroquinone and boric acid are obtained. By adding equimolar amounts of phenol to the reaction between boric acid and hydroquinone, a mixed polyester of hydroquinone, phenol and boric acid is obtained. From the ratio of the integral intensity of phenol protons to hydroquinone protons, it was found that the addition of phenol to the hydroquinone polydiester and boric acid occurs by 80%. The synthesized polyesters reacted with formaldehyde using o-xylene as a solvent and a boron trifluoride etherate catalyst. By the method of end groups it was determined that all the compounds obtained have a small molecular weight and belong to the class of oligomers. The structure of the synthesized oligomers was confirmed by elemental analysis, IR and NMR (1H, 13C) spectroscopy. All compounds obtained have a good adhesion to glass, wood and metal. The thermal destruction of samples in a flow of nitrogen at 900 °C was studied, the residual mass for polyesters is from 49 to 53%, for polymethylene ester - from 18.5 to 31%. The residual mass during thermo-oxidative degradation in an air flow at 600 ° C for polyesters is from 62 to 65%, for polymethylene ester from 37 to 44%. The reaction of the modification of synthesized oligomers with a sulfur curing system and epoxy resin was studied. The maximum content of insoluble gel fraction when cured by sulfuric system at a temperature of 220 °C reaches 94% for polymethylene diester hydroquinone and boric acid, the minimum is 68% for the polytriester of hydroquinone and boric acid. The maximum content of insoluble gel fraction when cured with epoxy resin at a temperature of 150 °C for polyesters is in the range 52 - 66 %, for polymethylene ester 50 - 61%.

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“…A well-designed coating always offered a reliable ablation resistance for a short-term ablation [7][8][9], while introduction of SiC and UHTC into C/C composites was necessary for the practical application in longterm service [10]. Content of introduced phases was firstly studied for modified C/C composites and results preferred a higher ceramic volume [11,12]. Furthermore, other factors such as the architecture of the carbon fabric [13], the original density of C/C composites' preform [14] and the thickness of the interface, [15] were proved to be important to the fabrication and ablation of the modified C/C composites.…”

Section: Introductionmentioning

confidence: 99%