A study on aluminide and Cr-modified aluminide coatings on TiAl alloys by pack cementation method

Chungen Zhou; Huibin Xu; Shengkai Gong; Ying Yang; Kyoo Young Kim

doi:10.1016/S0257-8972(00)00911-7

A study on aluminide and Cr-modified aluminide coatings on TiAl alloys by pack cementation method

Chungen Zhou, Huibin Xu, Shengkai Gong, Ying Yang, Kyoo Young Kim

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

75 Scopus citations

Abstract

The halide-activated pack cementation method was utilized to deposit a suitable coating on TiAl to ensure its oxidation resistance. TiAl alloys were coated by two different pack cementation processes with simple aluminide coating and Cr-modified aluminide coating. The coatings formed on the TiAl alloyed with Nb and Cr were thicker and tougher than those formed on the non-alloyed TiAl. The TiAl ₃ layer formed on the TiAl alloyed with Nb and Cr had much better cyclic oxidation resistance than that formed on the non-alloyed TiAl. This is attributed to a change in the crystal structure of the TiAl ₃ from the brittle tetragonal DO ₂₂ to the ductile cubic LI ₂ by addition of a small amount of Cr and Nb. The Cr-modified aluminide coating on the TiAl alloyed with Nb and Cr exhibited excellent cyclic oxidation resistance due to formation of the Al ₆₇Ti ₂₅Cr ₈ phase as the coating layer. (C) 2000 Published by Elsevier Science S.A. All rights reserved.

Original language	English
Pages (from-to)	117-123
Number of pages	7
Journal	Surface and Coatings Technology
Volume	132
Issue number	2-3
DOIs	https://doi.org/10.1016/S0257-8972(00)00911-7
State	Published - Oct 2000
Externally published	Yes

Funding

The National Natural Science Foundation of China and the Korea Science and Engineering Foundation are acknowledged for financial support.

Keywords

Aluminide coatings
Pack cementation
TiAl

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10.1016/S0257-8972(00)00911-7

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title = "A study on aluminide and Cr-modified aluminide coatings on TiAl alloys by pack cementation method",

abstract = "The halide-activated pack cementation method was utilized to deposit a suitable coating on TiAl to ensure its oxidation resistance. TiAl alloys were coated by two different pack cementation processes with simple aluminide coating and Cr-modified aluminide coating. The coatings formed on the TiAl alloyed with Nb and Cr were thicker and tougher than those formed on the non-alloyed TiAl. The TiAl 3 layer formed on the TiAl alloyed with Nb and Cr had much better cyclic oxidation resistance than that formed on the non-alloyed TiAl. This is attributed to a change in the crystal structure of the TiAl 3 from the brittle tetragonal DO 22 to the ductile cubic LI 2 by addition of a small amount of Cr and Nb. The Cr-modified aluminide coating on the TiAl alloyed with Nb and Cr exhibited excellent cyclic oxidation resistance due to formation of the Al 67Ti 25Cr 8 phase as the coating layer. (C) 2000 Published by Elsevier Science S.A. All rights reserved.",

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author = "Chungen Zhou and Huibin Xu and Shengkai Gong and Ying Yang and {Young Kim}, Kyoo",

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T1 - A study on aluminide and Cr-modified aluminide coatings on TiAl alloys by pack cementation method

AU - Zhou, Chungen

AU - Xu, Huibin

AU - Gong, Shengkai

AU - Yang, Ying

AU - Young Kim, Kyoo

PY - 2000/10

Y1 - 2000/10

N2 - The halide-activated pack cementation method was utilized to deposit a suitable coating on TiAl to ensure its oxidation resistance. TiAl alloys were coated by two different pack cementation processes with simple aluminide coating and Cr-modified aluminide coating. The coatings formed on the TiAl alloyed with Nb and Cr were thicker and tougher than those formed on the non-alloyed TiAl. The TiAl 3 layer formed on the TiAl alloyed with Nb and Cr had much better cyclic oxidation resistance than that formed on the non-alloyed TiAl. This is attributed to a change in the crystal structure of the TiAl 3 from the brittle tetragonal DO 22 to the ductile cubic LI 2 by addition of a small amount of Cr and Nb. The Cr-modified aluminide coating on the TiAl alloyed with Nb and Cr exhibited excellent cyclic oxidation resistance due to formation of the Al 67Ti 25Cr 8 phase as the coating layer. (C) 2000 Published by Elsevier Science S.A. All rights reserved.

AB - The halide-activated pack cementation method was utilized to deposit a suitable coating on TiAl to ensure its oxidation resistance. TiAl alloys were coated by two different pack cementation processes with simple aluminide coating and Cr-modified aluminide coating. The coatings formed on the TiAl alloyed with Nb and Cr were thicker and tougher than those formed on the non-alloyed TiAl. The TiAl 3 layer formed on the TiAl alloyed with Nb and Cr had much better cyclic oxidation resistance than that formed on the non-alloyed TiAl. This is attributed to a change in the crystal structure of the TiAl 3 from the brittle tetragonal DO 22 to the ductile cubic LI 2 by addition of a small amount of Cr and Nb. The Cr-modified aluminide coating on the TiAl alloyed with Nb and Cr exhibited excellent cyclic oxidation resistance due to formation of the Al 67Ti 25Cr 8 phase as the coating layer. (C) 2000 Published by Elsevier Science S.A. All rights reserved.

KW - Aluminide coatings

KW - Pack cementation

KW - TiAl

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U2 - 10.1016/S0257-8972(00)00911-7

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VL - 132

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JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

IS - 2-3

ER -

A study on aluminide and Cr-modified aluminide coatings on TiAl alloys by pack cementation method

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Keywords

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