Metastable Phase Formation in Rapidly Solidified ZrO2-Al 2O3 Powders

X. Zhou; R. K. Sadangi; B. H. Kear; W. R. Cannon

Metastable Phase Formation in Rapidly Solidified ZrO₂-Al ₂O₃ Powders

X. Zhou, R. K. Sadangi, B. H. Kear, W. R. Cannon

Research output: Contribution to journal › Conference article › peer-review

1 Scopus citations

Abstract

Rapidly solidified powders of ZrO₂/20Al₂O ₃ and ZrO₂/57Al₂O₃ (eutectic) were prepared by melting fine-particle aggregates in a high enthalpy plasma flame and then rapidly quenching the molten particles in cold water or on a copper chill plate. To ensure complete melting and homogenization of all the particles prior to quenching, the water-quenching treatment was often repeated two or even three times. The resulting melt-quenched powders and splats displayed a variety of metastable structures. The ZrO₂-rich composition formed an extended solid solution phase, whereas the eutectic composition formed a nano-fibrous or amorphous structure. Upon heat treatment, both compositions developed nanocomposite structures, comprising a uniform mixture of t-ZrO ₂ + α-Al₂O₃ phases.

Original language	English
Pages (from-to)	407-410
Number of pages	4
Journal	Materials Science Forum
Volume	437-438
State	Published - 2003
Externally published	Yes
Event	Proceedings of the 2nd International Conference on Advanced Materials Processing - Singapore, Singapore Duration: Dec 2 2002 → Dec 4 2002

Keywords

Cellular Growth
Eutectic Growth
Metastable Phases
Plasma Spraying
Rapid Solidification

Cite this

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title = "Metastable Phase Formation in Rapidly Solidified ZrO2-Al 2O3 Powders",

abstract = "Rapidly solidified powders of ZrO2/20Al2O 3 and ZrO2/57Al2O3 (eutectic) were prepared by melting fine-particle aggregates in a high enthalpy plasma flame and then rapidly quenching the molten particles in cold water or on a copper chill plate. To ensure complete melting and homogenization of all the particles prior to quenching, the water-quenching treatment was often repeated two or even three times. The resulting melt-quenched powders and splats displayed a variety of metastable structures. The ZrO2-rich composition formed an extended solid solution phase, whereas the eutectic composition formed a nano-fibrous or amorphous structure. Upon heat treatment, both compositions developed nanocomposite structures, comprising a uniform mixture of t-ZrO 2 + α-Al2O3 phases.",

keywords = "Cellular Growth, Eutectic Growth, Metastable Phases, Plasma Spraying, Rapid Solidification",

author = "X. Zhou and Sadangi, {R. K.} and Kear, {B. H.} and Cannon, {W. R.}",

year = "2003",

language = "English",

volume = "437-438",

pages = "407--410",

journal = "Materials Science Forum",

issn = "0255-5476",

publisher = "Trans Tech Publications",

note = "Proceedings of the 2nd International Conference on Advanced Materials Processing ; Conference date: 02-12-2002 Through 04-12-2002",

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TY - JOUR

T1 - Metastable Phase Formation in Rapidly Solidified ZrO2-Al 2O3 Powders

AU - Zhou, X.

AU - Sadangi, R. K.

AU - Kear, B. H.

AU - Cannon, W. R.

PY - 2003

Y1 - 2003

N2 - Rapidly solidified powders of ZrO2/20Al2O 3 and ZrO2/57Al2O3 (eutectic) were prepared by melting fine-particle aggregates in a high enthalpy plasma flame and then rapidly quenching the molten particles in cold water or on a copper chill plate. To ensure complete melting and homogenization of all the particles prior to quenching, the water-quenching treatment was often repeated two or even three times. The resulting melt-quenched powders and splats displayed a variety of metastable structures. The ZrO2-rich composition formed an extended solid solution phase, whereas the eutectic composition formed a nano-fibrous or amorphous structure. Upon heat treatment, both compositions developed nanocomposite structures, comprising a uniform mixture of t-ZrO 2 + α-Al2O3 phases.

AB - Rapidly solidified powders of ZrO2/20Al2O 3 and ZrO2/57Al2O3 (eutectic) were prepared by melting fine-particle aggregates in a high enthalpy plasma flame and then rapidly quenching the molten particles in cold water or on a copper chill plate. To ensure complete melting and homogenization of all the particles prior to quenching, the water-quenching treatment was often repeated two or even three times. The resulting melt-quenched powders and splats displayed a variety of metastable structures. The ZrO2-rich composition formed an extended solid solution phase, whereas the eutectic composition formed a nano-fibrous or amorphous structure. Upon heat treatment, both compositions developed nanocomposite structures, comprising a uniform mixture of t-ZrO 2 + α-Al2O3 phases.

KW - Cellular Growth

KW - Eutectic Growth

KW - Metastable Phases

KW - Plasma Spraying

KW - Rapid Solidification

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M3 - Conference article

AN - SCOPUS:0242322721

SN - 0255-5476

VL - 437-438

SP - 407

EP - 410

JO - Materials Science Forum

JF - Materials Science Forum

T2 - Proceedings of the 2nd International Conference on Advanced Materials Processing

Y2 - 2 December 2002 through 4 December 2002

ER -

Metastable Phase Formation in Rapidly Solidified ZrO₂-Al ₂O₃ Powders

Abstract

Keywords

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