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

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 °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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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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Correspondence to Xiaoming Duan or Peigang He or Dechang Jia.

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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. J Adv Ceram (2021). https://doi.org/10.1007/s40145-020-0451-0

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Keywords

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