Microstructural evolution of h-BN matrix composite ceramics with La–Al–Si–O glass phase during hot-pressed sintering

Baofu QIU; Xiaoming DUAN; Zhuo ZHANG; Chen ZHAO; Bo NIU; Peigang HE; Delong CAI; Lei CHEN; Zhihua YANG; Yujin WANG; Dechang JIA; Yu ZHOU

doi:10.1007/s40145-020-0451-0

Journal of Advanced Ceramics 2021, 10(3): 493-501 https://doi.org/10.1007/s40145-020-0451-0

Research Article |

Open Access | Issue | Published: 24 March 2021

Microstructural evolution of h-BN matrix composite ceramics with La–Al–Si–O glass phase during hot-pressed sintering

Show Author's Information Hide Author's Information Baofu QIU^{^a^,^b}, Xiaoming DUAN^{^a^,^b^,^c}(

), Zhuo ZHANG^{^a^,^b}, Chen ZHAO^{^a^,^b}, Bo NIU^{^a^,^b}, Peigang HE^{^a^,^b}(

), Delong CAI^{^a^,^b}, Lei CHEN^{^a^,^b}, Zhihua YANG^{^a^,^b^,^c}, Yujin WANG^{^a^,^b}, Dechang JIA^{^a^,^b^,^c}(

), Yu ZHOU^{^a^,^b}

aKey Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, China

bInstitute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

cState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

Keywords:

mechanical properties, microstructural evolution, h-BN matrix composite ceramics, La–Al–Si–O glass phase, nanocrystalline precipitation

Cite this article:

QIU B, DUAN X, ZHANG Z, et al. Microstructural evolution of h-BN matrix composite ceramics with La–Al–Si–O glass phase during hot-pressed sintering. Journal of Advanced Ceramics, 2021, 10(3): 493-501. https://doi.org/10.1007/s40145-020-0451-0

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Abstract

BN/La–Al–Si–O composite ceramics were fabricated by hot-pressed sintering using hexagonal boron nitride (h-BN), lanthanum oxide (La₂O₃), aluminia (Al₂O₃), and amorphous silica (SiO₂) as the raw materials. The effects of sintering temperature on microstructural evolution, bulk density, apparent porosity, and mechanical properties of the h-BN composite ceramics were investigated. The results indicated that La–Al–Si–O liquid phase was formed during sintering process, which provided an environment for the growth of h-BN grains. With increasing sintering temperature, the cristobalite phase precipitation and h-BN grain growth occurred at the same time, which had a significant influence on the densification and mechanical properties of h-BN composite ceramics. The best mechanical properties of BN/La–Al–Si–O composite ceramics were obtained under the sintering temperature of 1700 ℃. The elastic modulus, flexural strength, and fracture toughness were 80.5 GPa, 266.4 MPa, and 3.25 MPa·m^1/2, respectively.

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Microstructural evolution of h-BN matrix composite ceramics with La–Al–Si–O glass phase during hot-pressed sintering

Show Author's information Hide Author's Information Baofu QIU^{^a^,^b}, Xiaoming DUAN^{^a^,^b^,^c}(

), Zhuo ZHANG^{^a^,^b}, Chen ZHAO^{^a^,^b}, Bo NIU^{^a^,^b}, Peigang HE^{^a^,^b}(

), Delong CAI^{^a^,^b}, Lei CHEN^{^a^,^b}, Zhihua YANG^{^a^,^b^,^c}, Yujin WANG^{^a^,^b}, Dechang JIA^{^a^,^b^,^c}(

), Yu ZHOU^{^a^,^b}

aKey Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, China

bInstitute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

cState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

Abstract

Keywords: mechanical properties, microstructural evolution, h-BN matrix composite ceramics, La–Al–Si–O glass phase, nanocrystalline precipitation

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Acknowledgements

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Publication history

Received: 07 September 2020

Revised: 05 December 2020

Accepted: 24 December 2020

Published: 24 March 2021

Issue date: June 2021

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Acknowledgements

This study was financially supported by the National Key Research and Development Program of China (No. 2017YFB0310400) and the National Natural Science Foundation of China (Nos. 52072089, 51672060, and 51832002).

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