Role of Y during high temperature oxidation of an M-Cr-Al-Y coating on an Ni-base superalloy

H. M. Tawancy; N. M. Abbas; A. Bennett

doi:10.1016/0257-8972(94)90130-9

Role of Y during high temperature oxidation of an M-Cr-Al-Y coating on an Ni-base superalloy

H. M. Tawancy^*, N. M. Abbas, A. Bennett

^*Corresponding author for this work

King Fahd University of Petroleum & Minerals

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

57 Scopus citations

Abstract

A study was carried out to determine the role of Y during high temperature oxidation or an M-Cr-Al-Y-type coating on an Ni-base superalloy using various techniques of electron microscopy. Prior to oxidation exposures, Y was found to segregate within an external surface layer of the coating about 5 μm in thickness as well as within the interdiffusion zone. After exposure at 1000 or 1100°C in still air, Y exhibited a preferential tendency for segregation at grain boundaries of α-Al₂O₃ scale developed by the coating, however, a finite concentration of Y was also present in solid solution. In addition, some of the Y was found to oxidize into a Y-rich oxide "pegs" within the α-Al₂O₃ scale and extending into the coating. Experimental results showed that segregation of Y to grain boundaries could maintain a fine-grained scale after exposure for up to 1000 h at 1000 or 1100°C. It was concluded that, for the coating-substrate system studied, Y could improve the protective nature of α-Al₂O₃ scale by various mechanisms operating simultaneously.

Original language	English
Pages (from-to)	10-16
Number of pages	7
Journal	Surface and Coatings Technology
Volume	68-69
Issue number	C
DOIs	https://doi.org/10.1016/0257-8972(94)90130-9
State	Published - Dec 1994

Bibliographical note

Funding Information:
It is a pleasure to acknowledge the financial support of Rolls—Royce plc who also provided the coated alloys used in this study as well as the support of the Research Institute of King Fahd University of Petroleum and Minerals where this study was carried out.

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/0257-8972(94)90130-9

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title = "Role of Y during high temperature oxidation of an M-Cr-Al-Y coating on an Ni-base superalloy",

abstract = "A study was carried out to determine the role of Y during high temperature oxidation or an M-Cr-Al-Y-type coating on an Ni-base superalloy using various techniques of electron microscopy. Prior to oxidation exposures, Y was found to segregate within an external surface layer of the coating about 5 μm in thickness as well as within the interdiffusion zone. After exposure at 1000 or 1100°C in still air, Y exhibited a preferential tendency for segregation at grain boundaries of α-Al2O3 scale developed by the coating, however, a finite concentration of Y was also present in solid solution. In addition, some of the Y was found to oxidize into a Y-rich oxide {"}pegs{"} within the α-Al2O3 scale and extending into the coating. Experimental results showed that segregation of Y to grain boundaries could maintain a fine-grained scale after exposure for up to 1000 h at 1000 or 1100°C. It was concluded that, for the coating-substrate system studied, Y could improve the protective nature of α-Al2O3 scale by various mechanisms operating simultaneously.",

author = "Tawancy, \{H. M.\} and Abbas, \{N. M.\} and A. Bennett",

note = "Funding Information: It is a pleasure to acknowledge the financial support of Rolls—Royce plc who also provided the coated alloys used in this study as well as the support of the Research Institute of King Fahd University of Petroleum and Minerals where this study was carried out.",

year = "1994",

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doi = "10.1016/0257-8972(94)90130-9",

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AU - Tawancy, H. M.

AU - Abbas, N. M.

AU - Bennett, A.

N1 - Funding Information: It is a pleasure to acknowledge the financial support of Rolls—Royce plc who also provided the coated alloys used in this study as well as the support of the Research Institute of King Fahd University of Petroleum and Minerals where this study was carried out.

PY - 1994/12

Y1 - 1994/12

N2 - A study was carried out to determine the role of Y during high temperature oxidation or an M-Cr-Al-Y-type coating on an Ni-base superalloy using various techniques of electron microscopy. Prior to oxidation exposures, Y was found to segregate within an external surface layer of the coating about 5 μm in thickness as well as within the interdiffusion zone. After exposure at 1000 or 1100°C in still air, Y exhibited a preferential tendency for segregation at grain boundaries of α-Al2O3 scale developed by the coating, however, a finite concentration of Y was also present in solid solution. In addition, some of the Y was found to oxidize into a Y-rich oxide "pegs" within the α-Al2O3 scale and extending into the coating. Experimental results showed that segregation of Y to grain boundaries could maintain a fine-grained scale after exposure for up to 1000 h at 1000 or 1100°C. It was concluded that, for the coating-substrate system studied, Y could improve the protective nature of α-Al2O3 scale by various mechanisms operating simultaneously.

AB - A study was carried out to determine the role of Y during high temperature oxidation or an M-Cr-Al-Y-type coating on an Ni-base superalloy using various techniques of electron microscopy. Prior to oxidation exposures, Y was found to segregate within an external surface layer of the coating about 5 μm in thickness as well as within the interdiffusion zone. After exposure at 1000 or 1100°C in still air, Y exhibited a preferential tendency for segregation at grain boundaries of α-Al2O3 scale developed by the coating, however, a finite concentration of Y was also present in solid solution. In addition, some of the Y was found to oxidize into a Y-rich oxide "pegs" within the α-Al2O3 scale and extending into the coating. Experimental results showed that segregation of Y to grain boundaries could maintain a fine-grained scale after exposure for up to 1000 h at 1000 or 1100°C. It was concluded that, for the coating-substrate system studied, Y could improve the protective nature of α-Al2O3 scale by various mechanisms operating simultaneously.

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DO - 10.1016/0257-8972(94)90130-9

M3 - Article

AN - SCOPUS:0028671167

SN - 0257-8972

VL - 68-69

SP - 10

EP - 16

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

IS - C

ER -

Role of Y during high temperature oxidation of an M-Cr-Al-Y coating on an Ni-base superalloy

Abstract

Bibliographical note

ASJC Scopus subject areas

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