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Research Article | Open Access

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

Baofu QIUa,b, Xiaoming DUANa,b,c( ), Zhuo ZHANGa,b, Chen ZHAOa,b, Bo NIUa,b, Peigang HEa,b( ), Delong CAIa,b, Lei CHENa,b, Zhihua YANGa,b,c, Yujin WANGa,b, Dechang JIAa,b,c( ), Yu ZHOUa,b
Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, China
Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
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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·m1/2, respectively.

Keywords

h-BN matrix composite ceramicsLa–Al–Si–O glass phasemicrostructural evolutionnanocrystalline precipitationmechanical properties

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Journal of Advanced Ceramics
Volume 10 Issue 3,
June 2021
Pages 493-501
DOI: 10.1007/s40145-020-0451-0
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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Received: 07 September 2020
Revised: 05 December 2020
Accepted: 24 December 2020
Published: 24 March 2021
© The Author(s) 2020

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