Influence of sintering pressure on the crystallization and mechanical properties of BN-MAS composite ceramics

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• 作者：Delong Cai ; Zhihua Yang ; Xiaoming Duan ; Qian Zhang ; Qian Li…
• 刊名：Journal of Materials Science
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：51
• 期：5
• 页码：2292-2298
• 全文大小：1,529 KB
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• 作者单位：Delong Cai (1)
  Zhihua Yang (1) (2)
  Xiaoming Duan (1)
  Qian Zhang (1)
  Qian Li (1)
  Quan Li (1)
  Yangshan Sun (1)
  Dechang Jia (1) (2)
  Yu Zhou (1)
  
  1. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China
  2. Building C3, No. 2 Yikuang Street, Nangang District, Harbin, 150001, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803

文摘

A type of hexagonal boron nitride-magnesium aluminosilicate composite ceramics was fabricated by hot-pressed sintering under different pressures. The relationships between sintering pressure, microstructure, and mechanical properties were investigated. The results indicate that sintering pressure has a great influence not only on the mechanical properties of composite ceramics, but also on crystallization of magnesium aluminosilicate (MAS) and structural order of hexagonal boron nitride. Under the given sintering pressure of 30 MPa, the fracture toughness of composites was greatly improved 66 % (from 2.49 to 4.12 MPa m1/2, with similar densities). It also exhibits the highest bend strength of 245 ± 23 MPa. The fracture behavior of composites and the mechanism of sintering pressure which affect the crystallization of mullite in MAS were also discussed.