TY - JOUR
T1 - Microstructure and mechanical properties of three porous Si3N4 ceramics fabricated by different techniques
AU - Li, Xiangming
AU - Zhang, Litong
AU - Yin, Xiaowei
PY - 2012/7/15
Y1 - 2012/7/15
N2 - 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).
AB - 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).
KW - Mechanical property
KW - Microstructure
KW - Porous
UR - http://www.scopus.com/inward/record.url?scp=84861339506&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2012.03.114
DO - 10.1016/j.msea.2012.03.114
M3 - 文章
AN - SCOPUS:84861339506
SN - 0921-5093
VL - 549
SP - 43
EP - 49
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
ER -