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  • 1
    Electronic Resource
    Electronic Resource
    A Comparison between CoNiCrAlY Bond Coat and Zirconia Plasma Sprayed Coatings on Creep Tests (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 591-593 (Aug. 2008), p. 30-35 
    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: Thermomechanical and electrical properties of zirconia-based ceramics have led toa wide range of advanced and engineering ceramic applications like solid electrolyte inoxygen sensors, fuel cells and furnace elements and its low thermal conductivity has allowedits use for thermal barrier coatings for aerospace engine components. A comparisonbetween CoNiCrAlY bond coat and zirconia plasma sprayed coatings on creep tests of theTi-6Al-4V alloy was studied. The material used was commercial Ti-6Al-4V alloy. Yttria (8wt.%) stabilized zirconia (YSZ) with a CoNiCrAlY bond coat was atmospherically plasmasprayed on Ti-6Al-4V substrates by Sulzer Metco Type 9 MB. Constant load creep tests wereconducted on a standard creep machine in air on coated samples, at stress levels of 520MPa at 500ºC to evaluate the oxidation protection on creep of the Ti-6Al-4V alloy. Resultsindicate that the creep resistance of the ceramic coating was greater than metallic coating
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.591-593.30.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructural Evaluation of the Zirconia Plasma Sprayed Coating on Ti-6Al-4V Alloy after Creep Test (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 591-593 (Aug. 2008), p. 839-844 
    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: The titanium affinity by oxygen is one of main factors that limit the application oftheir alloys as structural materials at high temperatures. The objective of this work was evaluatingthe microstructure of the of the zirconia plasma sprayed coating Ti-6Al-4V alloy in creep test.Yttria (8 wt.%) stabilized zirconia (YSZ) (Metco 204B-NS) with a CoNiCrAlY bond coat(AMDRY 995C) was atmospherically plasma sprayed on Ti-6Al-4V substrates by Sulzer Metco.Constant load creep tests were conducted with Ti-6Al-4V alloy in air and in nitrogen atmospheresin uncoated samples and in air in coated samples at stress level of 56 MPa at 700°C. Themicrostructural analyze show that the predominant mechanism in the test conditions wascharacterized by formation and coalescence of micro cavities with shape and size varieties. Thecavities are corrugated in discontinue regions, like inclusions and points involving dislocation. Thesize and shape of dimples are governed by number and distribution of nucleated micro cavities andby stress internal level present in the material
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.591-593.839.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of Zirconia Plasma-Sprayed Coating on Creep of the Ti-6Al-4V Alloy (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 530-531 (Nov. 2006), p. 690-695 
    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: The titanium affinity by oxygen is one of main factors that limit the application oftheir alloys as structural materials at high temperatures. Notables advances have beenobeserved in the development of titanium alloys with the objective of improving the specifichigh temperature strength and creep-resistance properties. However, the surface oxidationlimits the use of these alloys in temperatures up to 600ºC. The objective of this work wasestimate the influence of the plasma-sprayed coatings for oxidation protection on creep of theTi-6Al-4V alloy, focusing on the determination of the experimental parameters related to theprimary and secondary creep states. Constant load creep tests were conducted with Ti-6Al-4Valloy in air for coated and uncoated samples and in nitrogen atmosphere for uncoated samplesat 500°C to evaluate the oxidation protection on creep of the Ti-6Al-4V alloy. Yttria (8 wt.%)stabilized zirconia (YSZ) with a CoNiCrAlY bond coat was atmospherically plasma sprayedon Ti-6Al-4V specimens. Results indicated the creep resistance of the coated alloy was greaterthan uncoated in air, but nitrogen atmosphere was more efficient in oxidation protection.Previously reported results about the activation energies and the stress exponents valuesindicate that the primary and stationary creep, for both test conditions, was probablycontrolled by dislocation climb. Occurred a decreasing of steady state creep in function of thereduction of oxidation process, showing that Ti-6Al-4V alloy lifetime was strongly affectedby the atmosphere due the oxidation suffered by the material
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.530-531.690.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    High Temperature Properties of Silicon Nitride with Neodymium Oxide Additions (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 591-593 (Aug. 2008), p. 560-564 
    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: Silicon nitride samples were formed by pressureless sintering process, using neodymium oxide assintering aid. The short term compressive creep behavior was evaluated over a stress range of 50-300 MPaand temperature range 1200-1350 0C. Post sintering heat treatments in nitrogen with a stepwise decrementalvariation of temperature were performed in some samples and microstructural analysis by X-raydiffractometry and Transmission Electron Microscopy showed that the secondary crystalline phases whichform from the remnant glass is dependent upon heat treatment. For the non heat treated samples, glassyregions were revealed, by centered dark field images, using diffuse scattered electrons, to be located at threeand four point grain junctions. No direct evidence of microstructural changes involving dislocationgeneration or motion was detected in the stress and temperature range studied. Stress exponents near unity,related to grain boundary accommodation processes were obtained for low temperatures and for heat treatedsamples. The behaviors for the heat treated samples were correlated in terms of depletion of metallic rareearthions and impurities from grain boundaries and triple junctions, with subsequent crystallization of theprimary glass. The non heat treated samples showed higher creep rates at higher stresses and temperatures.The deformation processes in these cases were correlated to stress concentrations at grain boundary andtriple point junctions, caused by grains rotation and sliding, accommodated by cavitation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.591-593.560.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Study of PSZ Sintered in Low Oxygen Partial Pressure (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 498-499 (Nov. 2005), p. 546-551 
    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: Thermomechanical and electrical properties of zirconia-based ceramics have led to a wide range of advanced and engineering ceramic applications like solid electrolyte in oxygen sensors, fuel cells and furnace elements and its low thermal conductivity has allowed its use for thermal barrier coatings for aerospace engine components. In this work, PSZ (partially stabilized zirconia) was studied to analyze the behavior during sintering in low oxygen partial pressure. Zirconia was partially stabilized with yttria 8 wt%. The sintering temperatures used were 1600, 1700, 1800 and 1900°C. The study of PSZ sintered in low oxygen partial pressure was done using Scanning Electron Microscope, X Ray Diffraction and density analysis. The values of samples density showed that the increasing in sintering temperature was favorable to the material densification. The monoclinic phase converted in tetragonal and cubic phases. The tetragonal phase maintains constant in all sintering temperatures, but the cubic phase increased at 1700 and 1800°C. The lattice parameters werecalculated and showed similar in all sintering temperature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.498-499.546.pdf
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