Effect of temperature on the growth of boron nitride interfacial coatings on SiC fibers by chemical vapor infiltration

Dai, Jianwei; Wang, Yiguang; Xu, Zhenhua; Mu, Rende; Lin, He

doi:10.1016/j.ceramint.2019.06.077

Cited by 17 publications

(10 citation statements)

References 26 publications

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“…In addition, the morphology of the interface on the fiber surface is relatively rough. The BN interface coating shows island‐like grain attributed to the lack of required energy to drive the BN grains migration at lower deposition temperatures 23 . As the temperature increases to 950°C, the interface layer on the surface of the fiber gradually becomes uniform and smooth as shown in Figure 4(C & D), which can be ascribed to the high energy BN grain with a two‐dimensional layer‐by‐layer growth mode.…”

Section: Resultsmentioning

confidence: 97%

“…The BN interface coating shows island-like grain attributed to the lack of required energy to drive the BN grains migration at lower deposition temperatures. 23 As the temperature increases to 950 • C, the interface layer on the surface of the fiber gradually becomes uniform and smooth as shown in Figure 4(C & D), which can be ascribed to the high energy BN grain with a two-dimensional layer-by-layer growth mode. Moreover, the BN interface of SiCnw becomes thicker and rough at 1050 • C, indicating the BN nucleation process that might occur a violent reaction in the gas (BCl 3 -NH 3 ) before the reactants reached the surface of the fiber.…”

Section: Effects Of Deposition Temperature On the Microstructure Of B...mentioning

confidence: 93%

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Microstructure and strengthening behavior in high content SiC nanowires reinforced SiC composites

et al. 2023

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In this study, the high-content SiC nw reinforced SiC ceramic matrix composites (SiC nw /SiC CMC) were successfully fabricated by hot pressing β-SiC and sintering additive (Al 2 O 3 -Y 2 O 3 ) with boron nitride interphase modification SiC nw . The effects of sintering additive content and mass fraction (5-25 wt%) of SiC nw on the density, microstructure, and mechanical properties of the composites were investigated. The results showed that with the increase of sintering additives from 10 wt% to 12 wt%, the relative density of the SiC nw /SiC CMC increased from 97.3% to 98.9%, attributed to the generated Y 3 Al 5 O 12 (YAG) liquid phase from the Al 2 O 3 -Y 2 O 3 that promotes the rearrangement and migration of SiC grains. The comprehensive performance of the obtained composite with 15 wt% SiC nw possessed the optimal flexural strength and fracture toughness of 524 ± 30.24 MPa and 12.39 ± 0.49 MPa⋅m 1/2 , respectively. Besides, the fracture mode of the composites with 25 wt% SiC nw content revealed a pseudo-plastic fracture behavior. It concludes that the 25 wt% SiC nw /SiC CMC was toughened by the fiber pull-outs, debonding, bridging, and crack deflection that can consume plenty of fracture energy. The strategy of SiC nanowires worked as a main bearing phase for the fabrication of SiC/SiC CMC providing critical information for understanding the mechanical behavior of high toughness and high strength SiC nanoceramic matrix composites.

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Section: Resultsmentioning

confidence: 97%

Section: Effects Of Deposition Temperature On the Microstructure Of B...mentioning

confidence: 93%

Microstructure and strengthening behavior in high content SiC nanowires reinforced SiC composites

et al. 2023

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“…Coatings deposited at 900 °C are quasi isotropic and barely crystallized, whereas coatings deposited at 1200 °C exhibit high structural anisotropy and a higher degree of crystallization. Crystallization of sp 2 -BN directly obtained by raising the deposition temperature is well established [7] whereas the diluent gas effect is less obvious. It nevertheless appears that N2 is more favourable than H2 for the organisation of the coating, particularly at 1200 °C.…”

Section: General Microstructural Organization Of Coatingsmentioning

confidence: 99%

“…Isothermal chemical vapour infiltration (CVI), derived from chemical vapour deposition (CVD), is the process commonly used to obtain these sub-micrometric thick coatings within fibrous preforms from BCl3 and NH3 often mixed with a diluent gas. Dai et al were able to examine the effect of CVI temperature on BN interphases obtained from BCl3 and NH3 up to 1050 °C [7]. But, the temperatures generally used are low (< 1000 °C) to facilitate infiltration into the preforms of several millimetres thickness [8] [9] [10], typical of that used in industrial CMCs.…”

Section: Introductionmentioning

confidence: 99%

TEM characterization of turbostratic and rhombohedral BN interphases synthesized by chemical vapour infiltration in SiC/SiC-Si composites

Plaisantin¹,

Jacques²,

Danet³

et al. 2021

Materials Characterization

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BN interphases were synthesized by chemical vapour infiltration (CVI) from BCl3 and NH3 at 900 °C and 1200 °C within preforms made of a single 2D woven SiC fibre ply. Then CVI of a SiC matrix followed by molten silicon infiltration resulted in laboratory-made single-ply SiC/SiC-Si composites representative of similar industrial ceramic matrix composites. The interphases and interfaces were characterized by transmission electron microscopy. It has been found that, in the two cases, the interphases are mostly turbostratic BN. Those synthesized at 900 °C are very poorly crystallized and exhibit a quasi-isotropic microstructure. An equiaxed interlayer is obtained prior to the columnar CVI growth of SiC matrix. Interphases synthesized at 1200 °C exhibit high degrees of crystallization and structural anisotropy. The SiC matrix grows directly in columns on BN. For interphase thicknesses of 300 nm and more, triangular-shaped crystallites of rhombohedral BN appear in turbostratic BN and the columnar growth of SiC is disoriented.

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“…The latter constituent is a sub-micrometric thin coating deposited by a method derived from chemical vapour deposition (CVD) on the fibres before the matrix. The t-BN deposited by CVD and used as an interphase can have different microstructures and degrees of crystallization depending on the processing conditions [4] [5] [6] [7] [8]. The role of the interphase is essential to the proper functioning of the CMC [9], it must be preserved during the use of the CMC in the oxidizing and corrosive environments of the aircraft engine [10].…”

Section: Introductionmentioning

confidence: 99%

Oxidation/corrosion of BN-based coatings as prospective interphases for SiC/SiC composites

Carminati

Jacques

Rebillat

2021

Journal of the European Ceramic Society

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The ceramic matrix composites envisaged as structural parts in the hot section of aircraft engines consist of SiC-based fibres and matrices with a BN interphase coating between them. To control their service life, the oxidation/corrosion behaviour of these materials must be determined. For this purpose, samples of different geometries were prepared by chemical vapour deposition and thermally subjected to wet air. The behaviour of BN alone depends on its crystallization degree, structural homogeneity and the considered direction in the coating. In the case of a thin layer of pure BN of interphase type, recession is significantly reduced at 800°C by the formation of a sealing borosilicate phase in the confined space surrounded by SiC. At 1000°C, the protection is no longer sufficient and a steady recession remains. The presence of aluminium added to BN improves protection at 1000°C due to the formation of alumina combined with borosilicate.

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Effect of temperature on the growth of boron nitride interfacial coatings on SiC fibers by chemical vapor infiltration

Cited by 17 publications

References 26 publications

Microstructure and strengthening behavior in high content SiC nanowires reinforced SiC composites

Microstructure and strengthening behavior in high content SiC nanowires reinforced SiC composites

TEM characterization of turbostratic and rhombohedral BN interphases synthesized by chemical vapour infiltration in SiC/SiC-Si composites

Oxidation/corrosion of BN-based coatings as prospective interphases for SiC/SiC composites

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