Study of color change and microstructure development of Al 2O3-Cr2O3/Cr3C 2 nanocomposites prepared by spark plasma sintering

Hao Tung Lin; Bo Zon Liu; Wei Hsio Chen; Jow Lay Huang; Pramoda K. Nayak

doi:10.1016/j.ceramint.2011.02.018

Study of color change and microstructure development of Al ₂O₃-Cr₂O₃/Cr₃C ₂ nanocomposites prepared by spark plasma sintering

Hao Tung Lin, Bo Zon Liu, Wei Hsio Chen, Jow Lay Huang, Pramoda K. Nayak

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	2081-2087
Number of pages	7
Journal	Ceramics International
Volume	37
Issue number	7
DOIs	https://doi.org/10.1016/j.ceramint.2011.02.018
Publication status	Published - 2011 Sep 1

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

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@article{fac837888c1d4361bb019193a0a72cf2,

title = "Study of color change and microstructure development of Al 2O3-Cr2O3/Cr3C 2 nanocomposites prepared by spark plasma sintering",

abstract = "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.",

author = "Lin, {Hao Tung} and Liu, {Bo Zon} and Chen, {Wei Hsio} and Huang, {Jow Lay} and Nayak, {Pramoda K.}",

year = "2011",

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doi = "10.1016/j.ceramint.2011.02.018",

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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.

PY - 2011/9/1

Y1 - 2011/9/1

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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