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

XIAO JU GAO1,2,* , CONG ZHANG2, ZHI PENG LI2, JIAN-WU CAO2, DONG-MING YAN2,3, WEI-MING LI2,3, DA-JI LI2, MING-JUN GU2

Affiliation

  1. Science and Technology on Thermostructural Composite Materia ls Laboratory, Northwestern Polytechnical University, Xi’an 710072, China
  2. No. 52 Institute of China North Industry Group, Yantai 264003, China
  3. Yantai Jinli New Materials Co., Ltd

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 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 1 5 wt%, the porosity and flexural strength of the sintered body reaches the optimum,.

Keywords

h-BN, Reactive synthetic, Card house structure, Sintering aids.

Citation

XIAO JU GAO, CONG ZHANG, ZHI PENG LI, JIAN-WU CAO, DONG-MING YAN, WEI-MING LI, DA-JI LI, MING-JUN GU, Fabrications, microstructure and mechanical behaviors of h-BN matrix ceramic, Optoelectronics and Advanced Materials - Rapid Communications, 9, 7-8, July-August 2015, pp.969-973 (2015).

Submitted at: April 2, 2015

Accepted at: June 24, 2015