TY - GEN
T1 - Growth characteristic and fracture toughness of laser rapidly solidified Al2O3/YAG/ZrO2 ceramic eutectic in situ composite
AU - Su, Haijun
AU - Zhang, Jun
AU - Liu, Lin
AU - Fu, Heng Zhi
PY - 2008
Y1 - 2008
N2 - Directionally solidified oxide ceramic eutectic composites with superior strength, oxidation resistance, creep resistance, structural stability and low sensitivity to crack at high temperature have aroused much attention in recent years, and various preparation techniques have been developed. In situ fabrication of ceramic eutectic composites by laser rapid solidification is a cheap and quick method compared to conventional multi-step fabrication methods of fiber reinforced composites for high temperature use. In this paper, Al 2O3/YAG/ZrO2 ternary eutectics are rapidly prepared from melt by directional solidification using laser zone remelting technique, the growth characteristic and fracture toughness are investigated. The results show that: (1) Laser rapidly solidified Al2O 3/YAG/ZrO2 ceramic eutectic in situ composite presents a fine interpenetrating network structure, in which Al2O3, YAG and ZrO2 phases are continually interconnected and finely coupled without pores, colonies and grain boundaries between interfaces. (2) Laser scanning rate and power density strongly affect the eutectic growth. With the processing parameters adjusted properly, the eutectic shows homogeneous and coupled lamellar microstructure. The characteristic dimensions of the microstructure are around 2-3 μm for Al2O3 and YAG phases, and around 0.2-1 μm for ZrO2 phases, respectively. (3) The hardness and fracture toughness of the rapidly solidified Al2O 3/YAG/ZrO2 eutectic are 16.7 GPa and 8.0 MPam 1/2, respectively.
AB - Directionally solidified oxide ceramic eutectic composites with superior strength, oxidation resistance, creep resistance, structural stability and low sensitivity to crack at high temperature have aroused much attention in recent years, and various preparation techniques have been developed. In situ fabrication of ceramic eutectic composites by laser rapid solidification is a cheap and quick method compared to conventional multi-step fabrication methods of fiber reinforced composites for high temperature use. In this paper, Al 2O3/YAG/ZrO2 ternary eutectics are rapidly prepared from melt by directional solidification using laser zone remelting technique, the growth characteristic and fracture toughness are investigated. The results show that: (1) Laser rapidly solidified Al2O 3/YAG/ZrO2 ceramic eutectic in situ composite presents a fine interpenetrating network structure, in which Al2O3, YAG and ZrO2 phases are continually interconnected and finely coupled without pores, colonies and grain boundaries between interfaces. (2) Laser scanning rate and power density strongly affect the eutectic growth. With the processing parameters adjusted properly, the eutectic shows homogeneous and coupled lamellar microstructure. The characteristic dimensions of the microstructure are around 2-3 μm for Al2O3 and YAG phases, and around 0.2-1 μm for ZrO2 phases, respectively. (3) The hardness and fracture toughness of the rapidly solidified Al2O 3/YAG/ZrO2 eutectic are 16.7 GPa and 8.0 MPam 1/2, respectively.
KW - AlO /YAG/ZrO
KW - Eutectic in situ composite
KW - Fracture toughness
KW - Growth characteristic
KW - Laser rapid solidification
KW - Oxide ceramic
UR - http://www.scopus.com/inward/record.url?scp=45749115787&partnerID=8YFLogxK
M3 - 会议稿件
AN - SCOPUS:45749115787
SN - 0878493999
SN - 9780878493999
T3 - Advanced Materials Research
SP - 495
EP - 500
BT - Advances in Fracture and Materials Behavior - Selected, peer reviewed papers of the Seventh International Conference on Fracture and Strength of Solids (FEOFS2007)
PB - Trans Tech Publications
T2 - 7th International Conference on Fracture and Strength of Solids, FEOFS 2007
Y2 - 27 August 2007 through 29 August 2007
ER -