Journal of Inorganic Materials ›› 2013, Vol. 28 ›› Issue (5): 469-473.doi: 10.3724/SP.J.1077.2013.12381

• Orginal Article • Previous Articles     Next Articles

Fabrication of Porous Silicon Nitride with High Porosity by Carbothermal Reduction-reaction Bonding

Yuan LU1,2, Jian-Feng YANG3, Jing-Long LI1,2   

  1. 1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
    2. Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an 710072, China
    3. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi’an 710049, China
  • Received:2012-06-15 Revised:2012-08-18 Online:2013-05-10 Published:2013-04-22
  • About author:LU Yuan. E-mail: luyuan19801104@163.com
  • Supported by:
    National Natural Science Foundation of China (50772086, 50821140308);The High-Tech R & D Program of China (2007AA03Z558)

Abstract:

By using cheaper Si, SiO2 and carbon black as starting material, the porous silicon nitride ceramics with high porosity and uniform pore structure were prepared by carbothermal reduction-reaction bonding method. The influences of Si content on the microstructure and mechanical properties of the samples were investigated. Microstructures and mechanical properties of porous silicon nitride ceramics were studied by XRD, SEM and three-point bending measurement. XRD analysis showed that only β-Si3N4 phase, minor of α-Si3N4 phase and glass phase Y3Si3O3N4 were detected in the samples. SEM analysis showed that porous silicon nitride ceramics obtained were composed of rod-like β-Si3N4 grains and uniform pores. Porous silicon nitride ceramics with different porosities and good mechanical properties were fabricated by changing the Si content.

Key words: carbothermal reduction-reaction bonding, porous silicon nitride ceramics, porosity

CLC Number: 

  • TQ171