TY - JOUR
T1 - Effect of Si2N2O content on the microstructure, properties, and erosion of silicon nitride-Si2N2O in situ composites
AU - Park, Dong Soo
AU - Choi, Hyun Ju
AU - Han, Byung Dong
AU - Kim, Hai Doo
AU - Lim, Dae Soon
N1 - Funding Information:
This work was supported by the National Research Laboratory program of the Korean Ministry of Science and Technology.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2002/9
Y1 - 2002/9
N2 - Silicon nitride-Si2N2O in situ composites were prepared by hot pressing powder mixtures of α-Si3N4, 6 wt% Y2O3, 1 wt% Al2O3, and 0-12 wt% SiO2 X-ray diffraction (XRD) analysis indicated that the volume percents of Si2N2O, 13, 31, and 54 for the composites prepared with 0, 4, 8, and 12 wt% SiO2, respectively. XRD results also indicated that both silicon nitride grains and Si2N2O grains were laid down perpendicular to hot pressing direction. As the volume percent of Si2N2O increased, the width and the amount of elongated silicon nitride grains decreased, but the fracture toughness increased. Young's modulus of the in situ composites decreased as the Si2N2O content was increased. The erosion rate decreased as the Si2N2O content was increased, in part, due to both the increased fracture toughness and the reduced grain size. Erosion of the composites occurred primarily due to the grain dislodgment. The sample without Si2N2O experienced micro-chipping due to transgranular fracture.
AB - Silicon nitride-Si2N2O in situ composites were prepared by hot pressing powder mixtures of α-Si3N4, 6 wt% Y2O3, 1 wt% Al2O3, and 0-12 wt% SiO2 X-ray diffraction (XRD) analysis indicated that the volume percents of Si2N2O, 13, 31, and 54 for the composites prepared with 0, 4, 8, and 12 wt% SiO2, respectively. XRD results also indicated that both silicon nitride grains and Si2N2O grains were laid down perpendicular to hot pressing direction. As the volume percent of Si2N2O increased, the width and the amount of elongated silicon nitride grains decreased, but the fracture toughness increased. Young's modulus of the in situ composites decreased as the Si2N2O content was increased. The erosion rate decreased as the Si2N2O content was increased, in part, due to both the increased fracture toughness and the reduced grain size. Erosion of the composites occurred primarily due to the grain dislodgment. The sample without Si2N2O experienced micro-chipping due to transgranular fracture.
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U2 - 10.1557/JMR.2002.0334
DO - 10.1557/JMR.2002.0334
M3 - Article
AN - SCOPUS:0036709684
VL - 17
SP - 2275
EP - 2280
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 9
ER -