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  • 1
    Electronic Resource
    Electronic Resource
    Effect of Platinum Pre-Coating on Isothermal Oxidation Behavior of MCrAlY Coating by Plasma Spray Process (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 721-724 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this work we have evaluated the effect of platinum (Pt) pre-coating on microstructureevolution of MCrAlY coating during isothermal oxidation, to improve high temperature oxidationand corrosion resistance of the nickel-based superalloy MAR M247-DS. Pt was deposited on thesuperalloy by electroplating before the MCrAlY coating by a vacuum plasma spray, which wascompared to the superalloy without Pt pre-coating. The samples were subjected to isothermaloxidation in a box furnace at 1100°C for 25–150 hrs. The weight gain and loss caused by theoxidation of samples was recorded, and the variation of surface layer and interface morphology wereobserved before and after the oxidation tests. The length decrement of cross section is remarkably lowon according to the precipitation of (Ni,Pt)Al phase by Pt pre-coating. Also, the amount of voids atinterface between the coating and the superalloy, which would be introduced as a processing defect, isreduced by Pt pre-coating
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.721.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Change of Microstructures of Directionally Solidified Ni Base Superalloy GTD-111 at High Temperature (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 65-70 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In the case of transient liquid phase diffusion bonding with Ni base superalloy GTD-111,the bonding temperature was sustained at 1403K ~ 1453K. Thus, the microstructure of specimensheated at 1403K ~ 1453K was examined. In the raw material, γ-γ' eutectic phases, platelet η phases,MC carbide and PFZ were clearly observed in interdendritic regions or near the grain boundary andthe size of primary γ' precipitates near the interdendritic regions were larger than the core. Theprimary γ' precipitated in the dendrite core dissolved early in the bonding process. γ' precipitatednear the interdendritic regions were partially solubilized and their shape was changed. Thedissolution rate increased with increasing temperature. Phases in the interdendritic regions or nearthe grain boundary changed continuously with time at the bonding temperature. At a bondingtemperature of 1403K, the eutectic phases remained, but η phases were transformed from a plateletshape to a needle morphology and the PFZ region widened with time. The interdendritic region andnear the grain boundary became partially liquid at 1423K and fully at 1453K by the reaction of ηphases and PFZ. The interdendritic region and near grain the boundary became liquid and newphases which were mixed with η phases, PFZ and MC carbide crystallized during cooling at 1453K.Crystalline η phases were transformed from a rod shape to a platelet shape with increasing holdingtime
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.65.pdf
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    Paper (German National Licenses)
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