Development of intermixed zones of alumina/zirconia in thermal barrier coating systems
The mechanisms whereby intermixed zones of alumina and zirconia are formed at the interface between the metallic bond coat and the ceramic top coat (yttria-stabilized zirconia) in thermal barrier coating systems have been investigated. The results lead to the following mechanism for the formation of...
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| Veröffentlicht in: | Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2007-04, Vol.38 (4), p.848-857 |
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| container_title | Metallurgical and materials transactions. A, Physical metallurgy and materials science |
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| creator | STIGER, M. J YANAR, N. M JACKSON, R. W LANEY, S. J PETTIT, F. S MEIER, G. H GANDHI, A. S LEVI, C. G |
| description | The mechanisms whereby intermixed zones of alumina and zirconia are formed at the interface between the metallic bond coat and the ceramic top coat (yttria-stabilized zirconia) in thermal barrier coating systems have been investigated. The results lead to the following mechanism for the formation of the zones. The predominant mechanism for intermixed zone formation involves formation of a metastable alumina polymorph (θ or γ) during TBC deposition, with a significant amount of zirconia dissolved in it. The outward growth also begins to incorporate zirconia particles, which initiates the formation of the intermixed zone. Upon thermal exposure, the metastable TGO continues to grow outward, extending the intermixed zone, and eventually transforms to the equilibrium α-Al^sub 2^O^sub 3^. The transformation to α-Al^sub 2^O^sub 3^ results in an increase in the volume fraction of zirconia in the intermixed zone as it is rejected from solution. Once the α-Al^sub 2^O^sub 3^ appears, subsequent TGO growth produces a columnar zone of the TGO without a second phase. When α-alumina was preformed on the bond coat, prior to TBC deposition, no intermixed zone was formed for Pt-modified aluminide bond coats. [PUBLICATION ABSTRACT] |
| doi_str_mv | 10.1007/s11661-007-9117-6 |
| format | Article |
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J ; YANAR, N. M ; JACKSON, R. W ; LANEY, S. J ; PETTIT, F. S ; MEIER, G. H ; GANDHI, A. S ; LEVI, C. G</creator><creatorcontrib>STIGER, M. J ; YANAR, N. M ; JACKSON, R. W ; LANEY, S. J ; PETTIT, F. S ; MEIER, G. H ; GANDHI, A. S ; LEVI, C. G</creatorcontrib><description>The mechanisms whereby intermixed zones of alumina and zirconia are formed at the interface between the metallic bond coat and the ceramic top coat (yttria-stabilized zirconia) in thermal barrier coating systems have been investigated. The results lead to the following mechanism for the formation of the zones. The predominant mechanism for intermixed zone formation involves formation of a metastable alumina polymorph (θ or γ) during TBC deposition, with a significant amount of zirconia dissolved in it. The outward growth also begins to incorporate zirconia particles, which initiates the formation of the intermixed zone. Upon thermal exposure, the metastable TGO continues to grow outward, extending the intermixed zone, and eventually transforms to the equilibrium α-Al^sub 2^O^sub 3^. The transformation to α-Al^sub 2^O^sub 3^ results in an increase in the volume fraction of zirconia in the intermixed zone as it is rejected from solution. Once the α-Al^sub 2^O^sub 3^ appears, subsequent TGO growth produces a columnar zone of the TGO without a second phase. When α-alumina was preformed on the bond coat, prior to TBC deposition, no intermixed zone was formed for Pt-modified aluminide bond coats. [PUBLICATION ABSTRACT]</description><identifier>ISSN: 1073-5623</identifier><identifier>EISSN: 1543-1940</identifier><identifier>DOI: 10.1007/s11661-007-9117-6</identifier><identifier>CODEN: MMTAEB</identifier><language>eng</language><publisher>New York, NY: Springer</publisher><subject>Alumina ; Applied sciences ; Exact sciences and technology ; Heat treating ; Metallurgy ; Metals. 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The outward growth also begins to incorporate zirconia particles, which initiates the formation of the intermixed zone. Upon thermal exposure, the metastable TGO continues to grow outward, extending the intermixed zone, and eventually transforms to the equilibrium α-Al^sub 2^O^sub 3^. The transformation to α-Al^sub 2^O^sub 3^ results in an increase in the volume fraction of zirconia in the intermixed zone as it is rejected from solution. Once the α-Al^sub 2^O^sub 3^ appears, subsequent TGO growth produces a columnar zone of the TGO without a second phase. When α-alumina was preformed on the bond coat, prior to TBC deposition, no intermixed zone was formed for Pt-modified aluminide bond coats. [PUBLICATION ABSTRACT]</description><subject>Alumina</subject><subject>Applied sciences</subject><subject>Exact sciences and technology</subject><subject>Heat treating</subject><subject>Metallurgy</subject><subject>Metals. 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A, Physical metallurgy and materials science</jtitle><date>2007-04-01</date><risdate>2007</risdate><volume>38</volume><issue>4</issue><spage>848</spage><epage>857</epage><pages>848-857</pages><issn>1073-5623</issn><eissn>1543-1940</eissn><coden>MMTAEB</coden><abstract>The mechanisms whereby intermixed zones of alumina and zirconia are formed at the interface between the metallic bond coat and the ceramic top coat (yttria-stabilized zirconia) in thermal barrier coating systems have been investigated. The results lead to the following mechanism for the formation of the zones. The predominant mechanism for intermixed zone formation involves formation of a metastable alumina polymorph (θ or γ) during TBC deposition, with a significant amount of zirconia dissolved in it. The outward growth also begins to incorporate zirconia particles, which initiates the formation of the intermixed zone. Upon thermal exposure, the metastable TGO continues to grow outward, extending the intermixed zone, and eventually transforms to the equilibrium α-Al^sub 2^O^sub 3^. The transformation to α-Al^sub 2^O^sub 3^ results in an increase in the volume fraction of zirconia in the intermixed zone as it is rejected from solution. Once the α-Al^sub 2^O^sub 3^ appears, subsequent TGO growth produces a columnar zone of the TGO without a second phase. When α-alumina was preformed on the bond coat, prior to TBC deposition, no intermixed zone was formed for Pt-modified aluminide bond coats. [PUBLICATION ABSTRACT]</abstract><cop>New York, NY</cop><pub>Springer</pub><doi>10.1007/s11661-007-9117-6</doi><tpages>10</tpages></addata></record> |
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| ispartof | Metallurgical and materials transactions. A, Physical metallurgy and materials science, 2007-04, Vol.38 (4), p.848-857 |
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| source | Springer Nature - Complete Springer Journals |
| subjects | Alumina Applied sciences Exact sciences and technology Heat treating Metallurgy Metals. Metallurgy Nonmetallic coatings Production techniques Surface treatment Transmission electron microscopy |
| title | Development of intermixed zones of alumina/zirconia in thermal barrier coating systems |
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