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

^*Corresponding author for this work

School of Materials Science and Engineering

Beihang University
Pohang University of Science and Technology

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

78 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

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.",

keywords = "Aluminide coatings, Pack cementation, TiAl",

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

year = "2000",

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language = "英语",

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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

UR - https://www.scopus.com/pages/publications/0034292439

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

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

M3 - 文章

AN - SCOPUS:0034292439

SN - 0257-8972

VL - 132

SP - 117

EP - 123

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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