Structure, composition, and defect control during plasma spray deposition of ytterbium silicate coatings
Environmental barrier coatings (EBCs) are needed to protect SiC structures exposed to high temperatures in water vapor-rich environments. Recent studies of a tri-layer EBC system consisting of a silicon layer attached to the SiC, a mullite diffusion barrier and a low-steam volatility ytterbium silic...
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| Veröffentlicht in: | Journal of materials science 2015-12, Vol.50 (24), p.7939-7957 |
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| creator | Richards, Bradley T. Zhao, Hengbei Wadley, Haydn N. G. |
| description | Environmental barrier coatings (EBCs) are needed to protect SiC structures exposed to high temperatures in water vapor-rich environments. Recent studies of a tri-layer EBC system consisting of a silicon layer attached to the SiC, a mullite diffusion barrier and a low-steam volatility ytterbium silicate topcoat have shown some promise for use at temperatures up to 1316 °C. However, the performance of the coating system appeared to be dependent upon the manner of its deposition. Here, an air plasma spray method has been used to deposit this tri-layer EBC on α-SiC substrates, and the effects of the plasma arc current and hydrogen content upon the structure, composition, and defects in ytterbium monosilicate (Yb
2
SiO
5
) and disilicate (Yb
2
Si
2
O
7
) topcoats are investigated. Modification of spray parameters enabled the loss of SiO from the injected powder to be reduced, leading to partial control of coating stoichiometry and phase content. It also enabled significant control of the morphology of solidified droplets, the porosity, and the microcracking behavior within the coatings. Differences between the Yb
2
SiO
5
and Yb
2
Si
2
O
7
are discussed in the context of their EBC application. |
| doi_str_mv | 10.1007/s10853-015-9358-5 |
| format | Article |
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2
SiO
5
) and disilicate (Yb
2
Si
2
O
7
) topcoats are investigated. Modification of spray parameters enabled the loss of SiO from the injected powder to be reduced, leading to partial control of coating stoichiometry and phase content. It also enabled significant control of the morphology of solidified droplets, the porosity, and the microcracking behavior within the coatings. Differences between the Yb
2
SiO
5
and Yb
2
Si
2
O
7
are discussed in the context of their EBC application.</description><identifier>ISSN: 0022-2461</identifier><identifier>EISSN: 1573-4803</identifier><identifier>DOI: 10.1007/s10853-015-9358-5</identifier><language>eng</language><publisher>New York: Springer US</publisher><subject>Air plasma ; Characterization and Evaluation of Materials ; Chemistry and Materials Science ; Classical Mechanics ; Coatings ; Composition ; Crack initiation ; Crystallography and Scattering Methods ; Diffusion barriers ; Diffusion layers ; Fracture mechanics ; Materials Science ; Microcracks ; Morphology ; Mullite ; Original Paper ; Parameter modification ; Plasma physics ; Polymer Sciences ; Porosity ; Powders ; Protective coatings ; Rare earth metals ; Silicates ; Silicon carbide ; Solid Mechanics ; Spray deposition ; Stoichiometry ; Substrates ; Volatility ; Water vapor ; Ytterbium</subject><ispartof>Journal of materials science, 2015-12, Vol.50 (24), p.7939-7957</ispartof><rights>Springer Science+Business Media New York 2015</rights><rights>COPYRIGHT 2015 Springer</rights><rights>Journal of Materials Science is a copyright of Springer, (2015). All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c525t-88e5e4d4f4e7c6a024f531ed84b2fc86eac37e67d9b286d8e876893171dda5543</citedby><cites>FETCH-LOGICAL-c525t-88e5e4d4f4e7c6a024f531ed84b2fc86eac37e67d9b286d8e876893171dda5543</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s10853-015-9358-5$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s10853-015-9358-5$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids></links><search><creatorcontrib>Richards, Bradley T.</creatorcontrib><creatorcontrib>Zhao, Hengbei</creatorcontrib><creatorcontrib>Wadley, Haydn N. G.</creatorcontrib><title>Structure, composition, and defect control during plasma spray deposition of ytterbium silicate coatings</title><title>Journal of materials science</title><addtitle>J Mater Sci</addtitle><description>Environmental barrier coatings (EBCs) are needed to protect SiC structures exposed to high temperatures in water vapor-rich environments. Recent studies of a tri-layer EBC system consisting of a silicon layer attached to the SiC, a mullite diffusion barrier and a low-steam volatility ytterbium silicate topcoat have shown some promise for use at temperatures up to 1316 °C. However, the performance of the coating system appeared to be dependent upon the manner of its deposition. Here, an air plasma spray method has been used to deposit this tri-layer EBC on α-SiC substrates, and the effects of the plasma arc current and hydrogen content upon the structure, composition, and defects in ytterbium monosilicate (Yb
2
SiO
5
) and disilicate (Yb
2
Si
2
O
7
) topcoats are investigated. Modification of spray parameters enabled the loss of SiO from the injected powder to be reduced, leading to partial control of coating stoichiometry and phase content. It also enabled significant control of the morphology of solidified droplets, the porosity, and the microcracking behavior within the coatings. Differences between the Yb
2
SiO
5
and Yb
2
Si
2
O
7
are discussed in the context of their EBC application.</description><subject>Air plasma</subject><subject>Characterization and Evaluation of Materials</subject><subject>Chemistry and Materials Science</subject><subject>Classical Mechanics</subject><subject>Coatings</subject><subject>Composition</subject><subject>Crack initiation</subject><subject>Crystallography and Scattering Methods</subject><subject>Diffusion barriers</subject><subject>Diffusion layers</subject><subject>Fracture mechanics</subject><subject>Materials Science</subject><subject>Microcracks</subject><subject>Morphology</subject><subject>Mullite</subject><subject>Original Paper</subject><subject>Parameter modification</subject><subject>Plasma physics</subject><subject>Polymer Sciences</subject><subject>Porosity</subject><subject>Powders</subject><subject>Protective coatings</subject><subject>Rare earth metals</subject><subject>Silicates</subject><subject>Silicon carbide</subject><subject>Solid Mechanics</subject><subject>Spray deposition</subject><subject>Stoichiometry</subject><subject>Substrates</subject><subject>Volatility</subject><subject>Water vapor</subject><subject>Ytterbium</subject><issn>0022-2461</issn><issn>1573-4803</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><sourceid>AFKRA</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNp1kU1rHSEUhqWk0Ju0P6A7oatAJlFHR2cZQtMGAoGkXYtXj7eGmXGiDvT--zpMS8kiuBAOz-PH-yL0mZJLSoi8ypQo0TaEiqZvhWrEO7SjQrYNV6Q9QTtCGGsY7-gHdJrzMyFESEZ36NdTSYstS4ILbOM4xxxKiNMFNpPDDjzYUudTSXHAbklhOuB5MHk0OM_JHCvyT8HR42MpkPZhGXEOQ7CmQJVNqVb-iN57M2T49Hc_Qz9vv_64-d7cP3y7u7m-b6xgojRKgQDuuOcgbWcI4160FJzie-at6sDYVkInXb9nqnMKlOxU31JJnTNC8PYMfdnOnVN8WSAX_RyXNNUrNWOil4ISvlKXG3UwA-gw-ViSsXU5GEP9L_hQ59ec9UoqyUUVzl8JaybwuxzMkrO-e3p8zdKNtSnmnMDrOYXRpKOmRK9t6a0tXdvSa1t6ddjm1FhrXJD-P_tt6Q8Dd5gW</recordid><startdate>20151201</startdate><enddate>20151201</enddate><creator>Richards, Bradley T.</creator><creator>Zhao, Hengbei</creator><creator>Wadley, Haydn N. G.</creator><general>Springer US</general><general>Springer</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>ISR</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>AFKRA</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>KB.</scope><scope>L6V</scope><scope>M7S</scope><scope>PDBOC</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope></search><sort><creationdate>20151201</creationdate><title>Structure, composition, and defect control during plasma spray deposition of ytterbium silicate coatings</title><author>Richards, Bradley T. ; Zhao, Hengbei ; Wadley, Haydn N. G.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c525t-88e5e4d4f4e7c6a024f531ed84b2fc86eac37e67d9b286d8e876893171dda5543</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Air plasma</topic><topic>Characterization and Evaluation of Materials</topic><topic>Chemistry and Materials Science</topic><topic>Classical Mechanics</topic><topic>Coatings</topic><topic>Composition</topic><topic>Crack initiation</topic><topic>Crystallography and Scattering Methods</topic><topic>Diffusion barriers</topic><topic>Diffusion layers</topic><topic>Fracture mechanics</topic><topic>Materials Science</topic><topic>Microcracks</topic><topic>Morphology</topic><topic>Mullite</topic><topic>Original Paper</topic><topic>Parameter modification</topic><topic>Plasma physics</topic><topic>Polymer Sciences</topic><topic>Porosity</topic><topic>Powders</topic><topic>Protective coatings</topic><topic>Rare earth metals</topic><topic>Silicates</topic><topic>Silicon carbide</topic><topic>Solid Mechanics</topic><topic>Spray deposition</topic><topic>Stoichiometry</topic><topic>Substrates</topic><topic>Volatility</topic><topic>Water vapor</topic><topic>Ytterbium</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Richards, Bradley T.</creatorcontrib><creatorcontrib>Zhao, Hengbei</creatorcontrib><creatorcontrib>Wadley, Haydn N. G.</creatorcontrib><collection>CrossRef</collection><collection>Gale In Context: Science</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>Materials Science Database</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Materials Science Collection</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><jtitle>Journal of materials science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Richards, Bradley T.</au><au>Zhao, Hengbei</au><au>Wadley, Haydn N. G.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Structure, composition, and defect control during plasma spray deposition of ytterbium silicate coatings</atitle><jtitle>Journal of materials science</jtitle><stitle>J Mater Sci</stitle><date>2015-12-01</date><risdate>2015</risdate><volume>50</volume><issue>24</issue><spage>7939</spage><epage>7957</epage><pages>7939-7957</pages><issn>0022-2461</issn><eissn>1573-4803</eissn><abstract>Environmental barrier coatings (EBCs) are needed to protect SiC structures exposed to high temperatures in water vapor-rich environments. Recent studies of a tri-layer EBC system consisting of a silicon layer attached to the SiC, a mullite diffusion barrier and a low-steam volatility ytterbium silicate topcoat have shown some promise for use at temperatures up to 1316 °C. However, the performance of the coating system appeared to be dependent upon the manner of its deposition. Here, an air plasma spray method has been used to deposit this tri-layer EBC on α-SiC substrates, and the effects of the plasma arc current and hydrogen content upon the structure, composition, and defects in ytterbium monosilicate (Yb
2
SiO
5
) and disilicate (Yb
2
Si
2
O
7
) topcoats are investigated. Modification of spray parameters enabled the loss of SiO from the injected powder to be reduced, leading to partial control of coating stoichiometry and phase content. It also enabled significant control of the morphology of solidified droplets, the porosity, and the microcracking behavior within the coatings. Differences between the Yb
2
SiO
5
and Yb
2
Si
2
O
7
are discussed in the context of their EBC application.</abstract><cop>New York</cop><pub>Springer US</pub><doi>10.1007/s10853-015-9358-5</doi><tpages>19</tpages></addata></record> |
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| subjects | Air plasma Characterization and Evaluation of Materials Chemistry and Materials Science Classical Mechanics Coatings Composition Crack initiation Crystallography and Scattering Methods Diffusion barriers Diffusion layers Fracture mechanics Materials Science Microcracks Morphology Mullite Original Paper Parameter modification Plasma physics Polymer Sciences Porosity Powders Protective coatings Rare earth metals Silicates Silicon carbide Solid Mechanics Spray deposition Stoichiometry Substrates Volatility Water vapor Ytterbium |
| title | Structure, composition, and defect control during plasma spray deposition of ytterbium silicate coatings |
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