New method of free silicon determination in pressureless sintered silicon nitride by Raman spectroscopy and XRD

Lukianova, O.A.; Parkhomenko, A. A.; Krasilnikov, V. V.; Khmara, A.N.; Kuzmenko, A. P.

doi:10.1016/j.ceramint.2019.04.148

Cited by 9 publications

(4 citation statements)

References 48 publications

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“…1(d), the peaks at about 1350 and 1580 cm −1 in the pyrolyzed C B -template are characteristic of the D (defect) and G (graphite) bands of graphitic carbon, respectively [28,29]. After the SiO gas and N 2 infiltration, for the C B -template, the peaks of products at approximately 510, 560, 664, 763, 972, and 1032 cm −1 are observed, which are related to the lattice vibration of the α-Si 3 N 4 crystal [30,31]. It is worth emphasizing that unreacted graphite phase is confirmed.…”

Section: Resultsmentioning

confidence: 94%

Anisotropic, biomorphic cellular Si3N4 ceramics with directional well-aligned nanowhisker arrays based on wood-mimetic architectures

Zhou

Zhi

et al. 2022

J Adv Ceram

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Inspired by the transport behavior of water and ions through the aligned channels in trees, we demonstrate a facile, scalable approach for constructing biomorphic cellular Si3N4 ceramic frameworks with well-aligned nanowhisker arrays on the surface of directionally aligned microchannel alignments. Through a facile Y(NO3)3 solution infiltration into wood-derived carbon preforms and subsequent heat treatment, we can faultlessly duplicate the anisotropic wood architectures into free-standing bulk porous Si3N4 ceramics. Firstly, α-Si3N4 microchannels were synthesized on the surface of CB-templates via carbothermal reduction nitridation (CRN). And then, homogeneous distributed Y−Si−O−N liquid phase on the walls of microchannel facilitated the anisotropic β-Si3N4 grain growth to form nanowhisker arrays. The dense aligned microchannels with low-tortuosity enable excellent load carrying capacity and thermal conduction through the entire materials. As a result, the porous Si3N4 ceramics exhibited an outstanding thermal conductivity (TC, kR ≈ 6.26 W·m−1·K−1), a superior flexural strength (σL ≈ 29.4 MPa), and a relative high anisotropic ratio of TC (kR/kL = 4.1). The orientation dependence of the microstructure-property relations may offer a promising perspective for the fabrication of multifunctional ceramics.

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Section: Resultsmentioning

confidence: 94%

Anisotropic, biomorphic cellular Si3N4 ceramics with directional well-aligned nanowhisker arrays based on wood-mimetic architectures

Zhou

Zhi

et al. 2022

J Adv Ceram

View full text Add to dashboard Cite

show abstract

“…1(d), the peaks at about 1350 cm − 1 and 1580 cm − 1 in the pyrolyzed C B -template are characteristic for the D (defect) and G (graphite) bands of graphitic carbon [23,24]. After the SiO gas and N 2 in ltration, for the C B -template, the peaks at approximately 510 cm − 1 , 560 cm − 1 , 763 cm − 1 , 848 cm − 1 , 914 cm − 1 , 972 cm − 1 , 1032 cm − 1 are observed, which are related to the lattice vibration of the α-Si 3 N 4 crystal [25,26]. It is worth emphasizing that unreacted graphite phase is con rmed.…”

Section: Resultsmentioning

confidence: 99%

Anisotropic, Biomorphic Cellular Si3N4 Ceramics with Directional Well-aligned Nanowhisker Arrays Based on Wood-Mimetic Architectures

Zhou

Zhi

et al. 2021

Preprint

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Inspired by the transport behavior of water and ions through the aligned channels in trees, we demonstrate a facile, scalable approach for constructing biomorphic cellular Si3N4 ceramic frameworks with well-aligned nanowhisker arrays on the surface of directionally aligned microchannel alignments. Through a facile Y(NO3)3 solution infiltration into wood-derived carbon preforms and subsequent heat treatment, we can faultlessly duplicate the anisotropic wood architectures into free-standing bulk porous Si3N4 ceramics. Firstly, α-Si3N4 microchannels were synthesized via carbothermal reduction nitridation. And then, homogeneous distributed Y-Si-O-N liquid phase on the walls of microchannel facilitated the anisotropic β-Si3N4 growth to form nanowhisker arrays. The dense aligned microchannels with low-tortuosity enable excellent load carrying capacity and thermal conduction through the entire materials. As a result, the porous Si3N4 ceramics exhibited an excellent thermal conductivity (TC, kR≈6.26 W·m− 1·K− 1), a superior flexural strength (σL ≈ 29.4 MPa), and a relative high anisotropic ratio of TC (kR/kL = ~ 4.1). The orientation dependence of the microstructure-property relations may offer a promising perspective for the fabrication of multifunctional ceramics.

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“…Besides, the peak at 1586 cm -1 corresponds to carbon with sp 2 hybridization [ 21 ], also known as the carbon G peak. Another peak recorded at 620 cm -1 is attributed to the Si-O bond [ 22 ] even though the E 2g mode of β-Si 3 N 4 [ 23 ] is also located at 620 cm -1 . Other characteristic peaks of β-Si 3 N 4 are not observed in Fig.…”

Section: In Uence Of Nature Of Fatty Acid On Frictionmentioning

confidence: 98%

Achieving Superlubricity of Ricinoleic Acid in the Steel/Si3N4 Contact Under Boundary Lubrication

et al. 2022

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To improve fuel e ciency and minimize environmental pollution, the interest in organic friction modi ers has resurged, especially fatty acids. Efforts have been made to enhance fatty acids' performance by tuning their saturation state and adding OH lateral groups in the alkyl chain. Here we compared lubrication properties in the boundary regime for oleic acid (OA), ricinoleic acid (RA), and linoleic acid (LA) under the same viscosity for a steel/Si 3 N 4 tribopair. The presence of the OH group in the OA chain reduces not only friction coe cient (CoF) by ~ 70% but also prevents scratches from generating on both surfaces. In the meantime, it determines local friction distribution by controlling top surface terminations.Even at 100°C, the steady-state friction coe cient of steel/Si 3 N 4 lubricated by RA is only 0.014. A temperature decrease to 80°C leads to a superlubricity regime (CoF < 0.01) resulting from the cooperation of nanometer-thick liquid lm (possibly containing water) and low friction of contact asperities terminated by OH hydroxyl groups provided by RA. In summary, steel/Si 3 N 4 contact lubricated by ricinoleic acid gives unsurpassed tribological performances reaching superlubricity under a wide range of operating conditions.

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New method of free silicon determination in pressureless sintered silicon nitride by Raman spectroscopy and XRD

Cited by 9 publications

References 48 publications

Anisotropic, biomorphic cellular Si3N4 ceramics with directional well-aligned nanowhisker arrays based on wood-mimetic architectures

Anisotropic, biomorphic cellular Si3N4 ceramics with directional well-aligned nanowhisker arrays based on wood-mimetic architectures

Anisotropic, Biomorphic Cellular Si3N4 Ceramics with Directional Well-aligned Nanowhisker Arrays Based on Wood-Mimetic Architectures

Achieving Superlubricity of Ricinoleic Acid in the Steel/Si3N4 Contact Under Boundary Lubrication

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