Fabrication and properties of borazine derived boron nitride matrix wave-transparent composites reinforced by 2.5 dimensional fabric of Si–N–O fibers

Zou, Chunrong; Zhang, Changrui; Li, Bin; Wang, Siqing; Xie, Zhihui; Song, Yimeng

doi:10.1016/j.msea.2014.10.046

Cited by 43 publications

(17 citation statements)

References 38 publications

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“…, where P is the applied load, R and t are the sample radius and thickness, and α is the semi‐contact angle of 0.15 rad. The average tensile stress at the peak loads is 15 MPa, which is low compared with the reported tensile strength of 80 MPa for this material (Table ); however, those data are for tensile loading parallel to the warp (i.e. y ‐direction, Fig.…”

Section: Resultssupporting

confidence: 90%

“…The obtained isotopic bulk modulus of 18.4 GPa is a 28.5% lower than the value reported in Table (Fig. b), which was measured with tensile load applied in the warp direction . The deformation of the vertically compressed disc sample may be affected by a lower modulus in the horizontal direction perpendicular to the warp (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…8b), which was measured with tensile load applied in the warp direction. 26 The deformation of the vertically compressed disc sample may be affected by a lower modulus in the horizontal direction perpendicular to the warp (Fig. 1a) for which there are no available data, so a discrepancy in the fitted value of an isotropic Young's modulus is reasonable.…”

Section: R E S U L T S a N D Discussionmentioning

confidence: 99%

“…The SiNO f /BN composite was prepared by the polymer infiltration and pyrolysis (PIP) method using vacuum‐assisted infiltration of liquid borazine as the precursor for the matrix . Cross‐linking and consolidation of the precursor was conducted at 90 °C, with an initial N 2 pressure of 3 MPa.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The SiNO f /BN composite was prepared by the polymer infiltration and pyrolysis (PIP) method using vacuum-assisted infiltration of liquid borazine as the precursor for the matrix. 26 Cross-linking and consolidation of the precursor was conducted at 90°C, with an initial N 2 pressure of 3 MPa. The solid preform was pyrolysed in 2 cycles, at 1000°C and 1200°C for 1 h under at N 2 atmosphere (0.1 MPa), to prevent the matrix from oxidizing during the ceramic conversion.…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

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Three‐dimensional measurement and cohesive element modelling of deformation and damage in a 2.5‐dimensional woven ceramic matrix composite

Saucedo-Mora

Zou

Lowe

et al. 2016

Fatigue Fract Eng Mat Struct

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A cohesive element numerical model, which reproduces the three‐dimensional microstructure of a 2.5‐dimensional silicon‐nitrogen‐oxide fibre/fabric‐reinforced boron nitride ceramic matrix composite (SiNO/BN) is applied to simulate the failure of specimens that are observed in situ during diametral compression testing. Measurements of deformation by image correlation of two‐dimensional optical surface observations and three‐dimensional X‐ray computed tomographs are used to fit the simulation's elastic properties for the matrix and fibre tows. The observed patterns of damage nucleation and propagation are correctly simulated using a local tensile strain criterion.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: R E S U L T S a N D Discussionmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Materials and Sample Preparationmentioning

confidence: 99%

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Three‐dimensional measurement and cohesive element modelling of deformation and damage in a 2.5‐dimensional woven ceramic matrix composite

Saucedo-Mora

Zou

Lowe

et al. 2016

Fatigue Fract Eng Mat Struct

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Nanosizing Ammonia Borane with Nickel: A Path toward the Direct Hydrogen Release and Uptake of BNH Systems

Lai

Rawal

Quadir

et al. 2017

Advanced Sustainable Systems

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also favors hydrogen release at low temperatures.AB can release hydrogen through hydro lysis and thermolysis; and various attempts have been made to effectively extract hydrogen from both routes. [2][3][4][5][6] The activa tion energy for AB hydrolysis was meas ured to be between 21 and 87 kJ mol −1 , [7] compared to values ranging from 69.6 to 184 kJ mol −1 for thermolysis. [1,[8][9][10][11] Hence, the hydrolysis route following (1a) and/or (1b) is easier to activate with the assistance of a metalbased catalyst [12][13][14][15][16][17][18][19][20] NH BH 3H O NH B OH 3H 3 3 2 3 3 2 ( ) + → + + (1a) NH BH 4H O NH B OH 3H 3 3 2 4 4 2 ( )However, following (1a) and (1b) the maximum amount of hydrogen released is limited to 7.1 and 5.8 mass%, respectively owing to the remaining hydrogen in the NH 3 /NH 4 + products, [21] and this capacity is even lower in practical systems when considering any excess of H 2 O. The hydrolysis route also suffers from two major issues. In addition to the concomitant release of ammonia (NH 3 ) with hydrogen, the hydrolysis of AB is highly exothermic (≈−227 kJ mol −1 ) owing to the bond strength difference between BO and BN. [5] It is thus very difficult to regenerate NH 3 BH 3 from its hydrolyzed borate products, i.e., B(OH) 3 On the other hand the thermolysis of AB is a solid-gas reaction with potential of releasing a larger amount of hydrogen (theoret ically up to 19.6 mass%). It is generally proposed that through thermolysis hydrogen is released from AB via a multi step Ammonia borane (AB), with one of the highest hydrogen content (19.6 mass%), has attracted much attention as a potential hydrogen storage material. However, its complex and multistep thermal decomposition process has left the idea that AB can only be an irreversible hydrogen storage material. Herein, we demonstrate the potential of a novel nanosizing strategy in overcoming current drawbacks. By (a) successfully restricting the particle size of AB to the nanoscale (≈50 nm), and (b) discreetly encapsulating the synthesised nanosized AB particles within a nickel (Ni) matrix, AB showed unforeseen hydrogen reversibility along its decomposition path. Owing to the catalytic effect of Ni and the embedment of AB with the Ni matrix, this nanosizing approach reduced the hydrogen release temperature, suppressed the melting of AB and the production of volatiles by-products including diborane and borazine. But more remarkably, this approach enabled the reversible release and uptake of pure hydrogen at 200 °C and 6 MPa H 2 pressure, only. Reversibility is thought to occur through an iminoborane oligomer resulting from the initial decomposition of the nanosized AB/Ni matrix. This result demonstrates for the first time the possibility of tailoring.

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Characterization and high-temperature degradation mechanism of continuous silicon nitride fibers

Shao

Wang

et al. 2017

J Mater Sci

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Fabrication and properties of borazine derived boron nitride matrix wave-transparent composites reinforced by 2.5 dimensional fabric of Si–N–O fibers

Cited by 43 publications

References 38 publications

Three‐dimensional measurement and cohesive element modelling of deformation and damage in a 2.5‐dimensional woven ceramic matrix composite

Three‐dimensional measurement and cohesive element modelling of deformation and damage in a 2.5‐dimensional woven ceramic matrix composite

Nanosizing Ammonia Borane with Nickel: A Path toward the Direct Hydrogen Release and Uptake of BNH Systems

Characterization and high-temperature degradation mechanism of continuous silicon nitride fibers

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