Reaction Sintering of Machinable TiB2-BN-C Ceramics with In-Situ Formed h-BN Nanostructure

Oleksii Popov; Dmitry V. Shtansky; Vladimir Vishnyakov; Oleksandra Klepko; Sergey Polishchuk; Magzhan K. Kutzhanov; Elizaveta S. Permyakova; Petro Teselko

doi:10.3390/NANO12081379

Reaction Sintering of Machinable TiB₂-BN-C Ceramics with In-Situ Formed h-BN Nanostructure

Oleksii Popov, Dmitry V. Shtansky, Vladimir Vishnyakov, Oleksandra Klepko, Sergey Polishchuk, Magzhan K. Kutzhanov, Elizaveta S. Permyakova, Petro Teselko

Research output: Contribution to journal › Article › peer-review

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Abstract

Soft TiB₂-BN-C hetero-modulus ceramics were sintered with the assistance of in-situ reactions during the hot pressing of TiN-B₄ C precursors. TiB₂ formation was observed already after the hot pressing at 1100^◦ C, remaining the only phase identifiable by XRD even after sintering at 1500^◦ C. Analysis of reaction kinetics allows us to assume that the most probable reaction controlling stage is boron atoms sublimation and gas phase transfer from B₄ C to TiN. Reactive sintering route allows almost full densification of TiB₂-BN-C composite ceramics at 1900^◦ C. The processes enable the formation of multilayer h-BN nanosheets inside the TiB₂ matrix. The manufactured TiB₂-33BN-13C ceramic with K_1C = 5.3 MPa·m^1/2 and H_V = 1.6 GPa is extremely thermal shock-resistant at least up to quenching temperature differential of 800^◦ C. The sintered UHTC composite can be machined into complex geometry components.

Original language	English
Article number	1379
Number of pages	15
Journal	Nanomaterials
Volume	12
Issue number	8
DOIs	https://doi.org/10.3390/NANO12081379
Publication status	Published - 2 Apr 2022

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@article{7d773bbada254e33aab90acf894129fd,

title = "Reaction Sintering of Machinable TiB2-BN-C Ceramics with In-Situ Formed h-BN Nanostructure",

abstract = "Soft TiB2-BN-C hetero-modulus ceramics were sintered with the assistance of in-situ reactions during the hot pressing of TiN-B4 C precursors. TiB2 formation was observed already after the hot pressing at 1100◦ C, remaining the only phase identifiable by XRD even after sintering at 1500◦ C. Analysis of reaction kinetics allows us to assume that the most probable reaction controlling stage is boron atoms sublimation and gas phase transfer from B4 C to TiN. Reactive sintering route allows almost full densification of TiB2-BN-C composite ceramics at 1900◦ C. The processes enable the formation of multilayer h-BN nanosheets inside the TiB2 matrix. The manufactured TiB2-33BN-13C ceramic with K1C = 5.3 MPa·m1/2 and HV = 1.6 GPa is extremely thermal shock-resistant at least up to quenching temperature differential of 800◦ C. The sintered UHTC composite can be machined into complex geometry components.",

keywords = "boron nitride nanosheets, hetero-modulus ceramics, machinable ceramic, pseudoplasticity, reactive sintering, thermal shock resistance, titanium diboride",

author = "Oleksii Popov and Shtansky, {Dmitry V.} and Vladimir Vishnyakov and Oleksandra Klepko and Sergey Polishchuk and Kutzhanov, {Magzhan K.} and Permyakova, {Elizaveta S.} and Petro Teselko",

note = "Publisher Copyright: {\textcopyright} 2022 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2022",

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doi = "10.3390/NANO12081379",

language = "English",

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AU - Popov, Oleksii

AU - Shtansky, Dmitry V.

AU - Vishnyakov, Vladimir

AU - Klepko, Oleksandra

AU - Polishchuk, Sergey

AU - Kutzhanov, Magzhan K.

AU - Permyakova, Elizaveta S.

AU - Teselko, Petro

PY - 2022/4/2

Y1 - 2022/4/2

N2 - Soft TiB2-BN-C hetero-modulus ceramics were sintered with the assistance of in-situ reactions during the hot pressing of TiN-B4 C precursors. TiB2 formation was observed already after the hot pressing at 1100◦ C, remaining the only phase identifiable by XRD even after sintering at 1500◦ C. Analysis of reaction kinetics allows us to assume that the most probable reaction controlling stage is boron atoms sublimation and gas phase transfer from B4 C to TiN. Reactive sintering route allows almost full densification of TiB2-BN-C composite ceramics at 1900◦ C. The processes enable the formation of multilayer h-BN nanosheets inside the TiB2 matrix. The manufactured TiB2-33BN-13C ceramic with K1C = 5.3 MPa·m1/2 and HV = 1.6 GPa is extremely thermal shock-resistant at least up to quenching temperature differential of 800◦ C. The sintered UHTC composite can be machined into complex geometry components.

AB - Soft TiB2-BN-C hetero-modulus ceramics were sintered with the assistance of in-situ reactions during the hot pressing of TiN-B4 C precursors. TiB2 formation was observed already after the hot pressing at 1100◦ C, remaining the only phase identifiable by XRD even after sintering at 1500◦ C. Analysis of reaction kinetics allows us to assume that the most probable reaction controlling stage is boron atoms sublimation and gas phase transfer from B4 C to TiN. Reactive sintering route allows almost full densification of TiB2-BN-C composite ceramics at 1900◦ C. The processes enable the formation of multilayer h-BN nanosheets inside the TiB2 matrix. The manufactured TiB2-33BN-13C ceramic with K1C = 5.3 MPa·m1/2 and HV = 1.6 GPa is extremely thermal shock-resistant at least up to quenching temperature differential of 800◦ C. The sintered UHTC composite can be machined into complex geometry components.

KW - boron nitride nanosheets

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KW - machinable ceramic

KW - pseudoplasticity

KW - reactive sintering

KW - thermal shock resistance

KW - titanium diboride

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Reaction Sintering of Machinable TiB₂-BN-C Ceramics with In-Situ Formed h-BN Nanostructure

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