TY - JOUR
T1 - Study of color change and microstructure development of Al 2O3-Cr2O3/Cr3C 2 nanocomposites prepared by spark plasma sintering
AU - Lin, Hao Tung
AU - Liu, Bo Zon
AU - Chen, Wei Hsio
AU - Huang, Jow Lay
AU - Nayak, Pramoda K.
N1 - Funding Information:
This study was supported by National Science Council of the Republic of China (R.O.C) under grant no. NSC 99-2923-E-006-002-MY3. The authors would like to thank Institute of Physics, Academia Sinica, Taipei, Taiwan, R.O.C. to carry out SPS measurements.
Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/9
Y1 - 2011/9
N2 - The densification behaviors of Al2O3-Cr 2O3/Cr3C2 nanocomposites prepared by a Spark Plasma Sintering (SPS) were investigated in this work. The initial powders used for sintering were Al2O3-Cr2O 3, which were prepared by metal organic chemical vapor deposition (MOCVD) in a spout bed. Different colors of the compacts such as green, purple and black were observed after densification process at different SPS temperatures from 1200 °C to 1350 °C. These changes of color were relevant to the existence of secondary phase of green Cr2O 3, pink solid solution of Cr2O3-Al 2O3 and black Cr3C2, which were formed under the different SPS temperature. The secondary phase of Cr 2O3 retarded the processing of densification for spark plasma sintering at 1200 °C. The Cr2O3 reacted with Al2O3 to form solid solution of Cr2O 3-Al2O3 and with carbon to form Cr 3C2 as sintering temperature increased to 1350 °C. The characteristics of high heating rate, shorter sintering time for SPS and the formation of secondary phase of Cr3C2 effectively reduced the substrate's grain growth, making Al2O3-Cr 2O3/Cr3C2 nanocomposites with small grain size.
AB - The densification behaviors of Al2O3-Cr 2O3/Cr3C2 nanocomposites prepared by a Spark Plasma Sintering (SPS) were investigated in this work. The initial powders used for sintering were Al2O3-Cr2O 3, which were prepared by metal organic chemical vapor deposition (MOCVD) in a spout bed. Different colors of the compacts such as green, purple and black were observed after densification process at different SPS temperatures from 1200 °C to 1350 °C. These changes of color were relevant to the existence of secondary phase of green Cr2O 3, pink solid solution of Cr2O3-Al 2O3 and black Cr3C2, which were formed under the different SPS temperature. The secondary phase of Cr 2O3 retarded the processing of densification for spark plasma sintering at 1200 °C. The Cr2O3 reacted with Al2O3 to form solid solution of Cr2O 3-Al2O3 and with carbon to form Cr 3C2 as sintering temperature increased to 1350 °C. The characteristics of high heating rate, shorter sintering time for SPS and the formation of secondary phase of Cr3C2 effectively reduced the substrate's grain growth, making Al2O3-Cr 2O3/Cr3C2 nanocomposites with small grain size.
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U2 - 10.1016/j.ceramint.2011.02.018
DO - 10.1016/j.ceramint.2011.02.018
M3 - Article
AN - SCOPUS:79960329065
VL - 37
SP - 2081
EP - 2087
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
IS - 7
ER -