Microstructure and room/elevated-temperature mechanical properties of hot-pressed h-BN composite ceramics with La2O3-Al2O3-SiO2 addition

Qiu, Baofu; Duan, Xiaoming; Zhang, Zhuo; Yan, Mufu; Cai, Delong; He, Peigang; Chen, Lei; Yang, Zhihua; Jia, Dechang; Zhou, Yu

doi:10.1016/j.jeurceramsoc.2020.02.013

Cited by 8 publications

(3 citation statements)

References 41 publications

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“…La-Al-Si-O glass phase has been reported on promoting sintering densification and improving the room/elevated-temperature mechanical properties of h-BN matrix composite ceramics [33][34][35][36][37]. However, the microstructural evolution during sintering process and its effect on properties of these material systems have not been fully revealed yet, which also has important implications for guiding the composition design and process optimization of composite ceramics.…”

Section: Introduction mentioning

confidence: 99%

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

et al. 2021

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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 °C. The elastic modulus, flexural strength, and fracture toughness were 80.5 GPa, 266.4 MPa, and 3.25 MPa·m1/2, respectively.

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Section: Introduction mentioning

confidence: 99%

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

et al. 2021

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show abstract

“…La-Al-Si-O glass phase have been reported on promoting sintering densi cation and improving the room/elevated-temperature mechanical properties of h-BN matrix composite ceramics [33][34][35][36][37]. But the microstructural evolution during sintering process and its effect on properties of this material systems have not been fully revealed yet, which also has important implications for guiding the composition design and process optimization of composite ceramics.…”

Section: Introductionmentioning

confidence: 99%

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

Qiu

Duan

Zhang

et al. 2020

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BN/La-Al-Si-O composite ceramics were fabricated by hot-pressed sintering using h-BN, La2O3, Al2O3 and amorphous SiO2 as the raw materials. The effects of sintering temperature on the microstructural evolution, bulk density, apparent porosity, and mechanical properties of 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 the 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 sintering temperature of 1700 °C, and the elastic modulus, flexural strength, and fracture toughness were 80.5 GPa, 266.4 MPa and 3.25 MPa·m1/2, respectively.

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“…Ternary amorphous La 2 O 3 -Al 2 O 3 -SiO 2 glass phase have been reported on promoting sintering densi cation and improving the room/elevated-temperature mechanical properties of h-BN matrix composite ceramics [33][34][35][36][37]. But the microstructural evolution during sintering process and its effect on properties of this material systems have not been fully revealed yet, which also has important implications for guiding the composition design and process optimization of composite ceramics.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of H-BN Matrix Composite Ceramics With Amorphous La2O3-Al2O3-SiO2 Glass Phase During Hot Pressing

Qiu

Duan

Zhang

et al. 2020

Preprint

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BN-La2O3-Al2O3-SiO2 composite ceramics were fabricated by hot press sintering using h-BN, La2O3, Al2O3 and amorphous SiO2 as the raw materials. The effects of sintering temperature on the microstructural evolution, bulk density, apparent porosity, and mechanical properties of h-BN composite ceramics were investigated. The results indicated that ternary La2O3-Al2O3-SiO2 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 the significant influence on the densification and mechanical properties of h-BN composite ceramics. The best mechanical properties of BN-La2O3-Al2O3-SiO2 composite ceramics were obtained under sintering temperature of 1700 °C, and the elastic modulus, flexural strength, and fracture toughness were 80.5 GPa, 266.4 MPa and 3.25 MPa·m1/2, respectively.

show abstract

Microstructure and room/elevated-temperature mechanical properties of hot-pressed h-BN composite ceramics with La2O3-Al2O3-SiO2 addition

Cited by 8 publications

References 41 publications

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

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

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

Microstructural Evolution of H-BN Matrix Composite Ceramics With Amorphous La2O3-Al2O3-SiO2 Glass Phase During Hot Pressing

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Microstructure and room/elevated-temperature mechanical properties of hot-pressed h-BN composite ceramics with La2O3-Al2O3-SiO2 addition

Cited by 8 publications

References 41 publications

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

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

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

Microstructural Evolution of H-BN&nbsp;Matrix Composite Ceramics With Amorphous La2O3-Al2O3-SiO2&nbsp;Glass Phase During Hot Pressing

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Microstructural Evolution of H-BN Matrix Composite Ceramics With Amorphous La2O3-Al2O3-SiO2 Glass Phase During Hot Pressing