Microstructure and mechanical properties of three porous Si3N4 ceramics fabricated by different techniques

Xiangming Li, Litong Zhang, Xiaowei Yin

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

Three porous Si3N4 ceramics were fabricated using the same starting Si3N4 powder by techniques of (1) oxidation-bonding combined with sol-gel infiltration sintering (OB-IS), (2) cold-pressing combined with pressureless-sintering (CP-PS), and (3) 3D-printing combined with pressureless-sintering (3DP-PS). Due to the obvious difference in microstructure, phase composition, linear shrinkage, pore size distribution and porosity, the three porous Si3N4 ceramics possess characteristic in mechanical properties. Si3N4-(OB-IS) possesses lower flexural strength (23-120MPa), fracture toughness (0.4-1.4MPam1/2) and Young's modulus (9.1-26.3GPa) but the highest Vickers hardness (1.1-4.1GPa). Si3N4-(CP-PS) possesses the highest flexural strength (143-207MPa), fracture toughness (2.3-3.4MPam1/2) and Young's modulus (45.8-58.5GPa) but lower Vickers hardness (0.8-1.1GPa). Si3N4-(3DP-PS) possesses the lowest flexural strength (13MPa), fracture toughness (0.3MPam1/2), Young's modulus (3.9GPa) and Vickers hardness (0.4GPa).

Original languageEnglish
Pages (from-to)43-49
Number of pages7
JournalMaterials Science and Engineering: A
Volume549
DOIs
StatePublished - 15 Jul 2012

Keywords

  • Mechanical property
  • Microstructure
  • Porous

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