Fabrications, microstructure and mechanical behaviors of h-BN matrix ceramic

Xiao Ju Gao*, Cong Zhang, Zhi Peng Li, Jian Wu Cao, Dong Ming Yan, Wei Ming Li, Da Ji Li, Ming Jun Gu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Turbostratic boron nitride (t-BN) powders have been synthesized through reactive sintering process using B and N2, h-BN matrix ceramic has been sintered using the obtained t-BN powders and the commercial h-BN as raw materials and Al2O3/Y2O3 as sintering aids. The compositions, morphologies, porosity, and mechanical properties of the as fabricated composites were investigated. The results show that after sintering at 1850°C for 2 h, the unique uniform with card- house structure of h-BN was observed. The combination effect of sintering-aids densification and card-house structure densification is the main mechanism which controls the microstructure evolution of h-BN. When the reactive synthetic temperature of t-BN is 1350℃ for 2h, the Al2O3/Y2O3 ratio is 3: 2 and total contents of sintering ads is 15wt%, the porosity and flexural strength of the sintered body reaches the optimum, respectively.

Original languageEnglish (US)
Pages (from-to)969-973
Number of pages5
JournalOptoelectronics and Advanced Materials, Rapid Communications
Volume9
Issue number7-8
StatePublished - 2015
Externally publishedYes

Keywords

  • Card-house structure
  • H-BN
  • Reactive synthetic
  • Sintering-aids

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

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