@article{QIU2021, 
author = {Baofu QIU and Xiaoming DUAN and Zhuo ZHANG and Chen ZHAO and Bo NIU and Peigang HE and Delong CAI and Lei CHEN and Zhihua YANG and Yujin WANG and Dechang JIA and Yu ZHOU},
title = {Microstructural evolution of h-BN matrix composite ceramics with La–Al–Si–O glass phase during hot-pressed sintering},
year = {2021},
journal = {Journal of Advanced Ceramics},
volume = {10},
number = {3},
pages = {493-501},
keywords = {h-BN matrix composite ceramics, La–Al–Si–O glass phase, microstructural evolution, nanocrystalline precipitation, mechanical properties},
url = {https://www.sciopen.com/article/10.1007/s40145-020-0451-0},
doi = {10.1007/s40145-020-0451-0},
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.}
}