Abstract
The densification behaviors of Al 2O 3–Cr 2O 3/Cr 3C 2 nanocomposites prepared by a Spark Plasma Sintering (SPS) were investigated in this work. The initial powders used for sintering were Al 2O 3–Cr 2O 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 Cr 2O 3, pink solid solution of Cr 2O 3–Al 2O 3 and black Cr 3C 2, which were formed under the different SPS temperature. The secondary phase of Cr 2O 3 retarded the processing of densification for spark plasma sintering at 1200 °C. The Cr 2O 3 reacted with Al 2O 3 to form solid solution of Cr 2O 3–Al 2O 3 and with carbon to form Cr 3C 2 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 Cr 3C 2 effectively reduced the substrate's grain growth, making Al 2O 3–Cr 2O 3/Cr 3C 2 nanocomposites with small grain size.
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