Strengthening and toughening effects of MWCNTs on Si2BC3N ceramics sintered by SPS technique

Liao, Ning; Jia, Dechang; Yang, Zhihua; Zhou, Yu; Li, Yawei; Jia, Xueyong

doi:10.1016/j.msea.2017.10.089

Cited by 23 publications

(22 citation statements)

References 34 publications

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“…The well-known strengthening and toughening mechanisms are "crack bridging", "pull-out", and "crack deflection". Lately, we have found that the MWCNTs could also enhance the bulk SiBCN ceramics remarkably [23]. Although the MWCNTs have shown positive influences on the strengths and toughness, their specific influence on thermal shock behavior has not been revealed yet.…”

Section: Preparation Of Mwcnts-si 2 Bc 3 N Nanocompositesmentioning

confidence: 98%

“…The starting raw materials were well crystalline cubic silicon powder (95% in purity, 45.0 μm, Beijing Mountain Technical Development Center, China), hexagonal boron nitride power (98.0% in purity, B 2 O 3 < 0.4 wt%, 0.6 μm, Advanced Technology & Materials Co., Ltd., Beijing, China), and graphite flake (99.5% in purity, 8.7 μm, Qingdao Huatai Lubricant Sealing S&T Co., Ltd., China). According to our previous works, the molar ratio of Si:BN:C was set as 2:1:3 and the ball to powder mass ratio was 20:1 [23]. Then the mixed powder was loaded into the silicon nitride vials along with identical component balls under argon atmosphere and milled by a planetary ball mill (P4, Fritsch GmbH, Germany).…”

Section: Preparation Of Mwcnts-si 2 Bc 3 N Nanocompositesmentioning

confidence: 99%

“…The corresponding SEM microstructures of as-prepared SiBCN powder, MWNCTs, and MWCNTs-Si 2 BC 3 N composites were referred to Ref. [23].…”

Section: Preparation Of Mwcnts-si 2 Bc 3 N Nanocompositesmentioning

confidence: 99%

“…Besides, it can still be seen that the particle sizes of BN(C) plates are decreased gradually with the increasing of MWCNTs contents. This result reveals that the introduction of MWCNTs could hinder the growths of BN(C) and SiC particles due to the restrained solid phase diffusion of nano BN(C) and SiC crystals [23].…”

mentioning

confidence: 94%

“…Furthermore, the magnified pictures also demonstrate that the main toughening mechanisms for pure Si 2 BC 3 N ceramics are "pull-out" and "crack deflection" of BN(C). In comparison, the adoption of MWCNTs could further toughen the composites through "crack bridging", "pull-out", and "crack deflection" mechanisms [23].…”

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confidence: 99%

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Enhanced thermal shock and oxidation resistance of Si2BC3N ceramics through MWCNTs incorporation

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Multi-walled carbon nanotubes (MWCNTs) reinforced Si 2 BC 3 N ceramics were prepared through mechanical alloying (MA) and following spark plasma sintering (SPS). The thermal shock resistance of Si 2 BC 3 N ceramics was evaluated comparatively through ice water quenching test and theoretical prediction. Furthermore, the oxidation resistance of MWCNTs incorporated Si 2 BC 3 N ceramics was evaluated under high temperature. The results show that the calculated parameters such as the critical thermal shock temperature (R) and the thermal stresses resistance (R st ), as well as the toughness (R) are improved with addition of 1 vol% MWCNTs. In addition, the crack propagation resistance of 1 vol% MWCNTs incorporated Si 2 BC 3 N ceramics is obviously improved through generating more tortuous crack propagation paths attributing to the "crack bridging", "pull-out", and "crack deflection" mechanisms of MWCNTs. Therefore, the residual strengths of 1 vol% MWCNTs containing specimens remained the highest after the thermal shock tests. Besides, the present work also reveals that the oxidation resistance is more sensitive to relative density than MWCNTs addition. a next generation of sharp re-entry space vehicles [1]. Up to date, the intensively investigated HTCs are mainly composed of binary (e.g., SiC, Si 3 N 4 , and ZrB 2 ), ternary (SiCN), and quaternary (including SiBCN and SiCNTi) composites [2][3][4]. In the last decade, we have successfully prepared bulk SiBCN ceramics through MA and subsequently HP/SPS sintering. With preparing bulk SiBCN ceramics, the measurements of properties such as flexural strength, fracture toughness, and thermal shock resistance became feasible [5][6][7][8][9]. Among J Adv Ceram 2018, 7(3): 276-288 277 Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons. org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Section: Preparation Of Mwcnts-si 2 Bc 3 N Nanocompositesmentioning

confidence: 98%

Section: Preparation Of Mwcnts-si 2 Bc 3 N Nanocompositesmentioning

confidence: 99%

“…The corresponding SEM microstructures of as-prepared SiBCN powder, MWNCTs, and MWCNTs-Si 2 BC 3 N composites were referred to Ref. [23].…”

Section: Preparation Of Mwcnts-si 2 Bc 3 N Nanocompositesmentioning

confidence: 99%

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confidence: 94%

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confidence: 99%

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Enhanced thermal shock and oxidation resistance of Si2BC3N ceramics through MWCNTs incorporation

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Enhanced mechanical properties and thermal shock resistance of Si2BC3N ceramics with SiC coated MWCNTs

et al. 2019

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Bulk Si 2 BC 3 N ceramics were reinforced with SiC coated multi-walled carbon nanotubes (MWCNTs). The phase compositions, mechanical properties, and thermal shock resistance, as well as the oxidation resistance of the designed Si 2 BC 3 N ceramics were comparatively investigated. The results show that nano SiC coating can be formed on MWCNTs through pyrolyzing polysilazane, which improves the oxidation resistance of MWCNTs. A stronger chemical bonding is formed between the SiC coated MWCNTs and SiC particles, contributing to improved flexural strength (532.1 MPa) and fracture toughness (6.66 MPa•m 1/2). Besides, the 2 vol% SiC coated MWCNTs reinforced Si 2 BC 3 N ceramics maintains much higher residual strength (193.0 MPa) after thermal shock test at 1000 ℃. The enhanced properties should be attributed to: (1) the breaking of MWCNTs and the debonding between MWCNTs and SiC interfaces, which leads to more energy dissipation; (2) the rough surfaces of SiC coated MWCNTs increase the adhesion strength during the "pull out" of MWCNTs.

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Microstructural evolution and mechanical properties of in situ nano Ta4HfC5 reinforced SiBCN composite ceramics

Wang

Yang

et al. 2020

J Adv Ceram

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The in situ nano Ta4HfC5 reinforced SiBCN-Ta4HfC5 composite ceramics were prepared by a combination of two-step mechanical alloying and reactive hot-pressing sintering. The microstructural evolution and mechanical properties of the resulting SiBCN-Ta4HfC5 were studied. After the first-step milling of 30 h, the raw materials of TaC and HfC underwent crushing, cold sintering, and short-range interdiffusion to finally obtain the high pure nano Ta4HfC5. A hybrid structure of amorphous SiBCN and nano Ta4HfC5 was obtained by adopting a second-step ball-milling. After reactive hot-pressing sintering, amorphous SiBCN has crystallized to 3C-SiC, 6H-SiC, and turbostratic BN(C) phases and Ta4HfC5 retained the form of the nanostructure. With the in situ generations of 2.5 wt% Ta4HfC5, Ta4HfC5 is preferentially distributed within the turbostratic BN(C); however, as Ta4HfC5 content further raised to 10 wt%, it mainly distributed in the grain-boundary of BN(C) and SiC. The introduction of Ta4HfC5 nanocrystals can effectively improve the flexural strength and fracture toughness of SiBCN ceramics, reaching to 344.1 MPa and 4.52 MPa·m1/2, respectively. This work has solved the problems of uneven distribution of ultra-high temperature phases in the ceramic matrix, which is beneficial to the real applications of SiBCN ceramics.

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Strengthening and toughening effects of MWCNTs on Si2BC3N ceramics sintered by SPS technique

Cited by 23 publications

References 34 publications

Enhanced thermal shock and oxidation resistance of Si2BC3N ceramics through MWCNTs incorporation

Enhanced thermal shock and oxidation resistance of Si2BC3N ceramics through MWCNTs incorporation

Enhanced mechanical properties and thermal shock resistance of Si2BC3N ceramics with SiC coated MWCNTs

Microstructural evolution and mechanical properties of in situ nano Ta4HfC5 reinforced SiBCN composite ceramics

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