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  • Physics  (68)
  • 1
    Online Resource
    Online Resource
    Vapor deposition on doublet airfoil substrates: Coating thickness control
    American Vacuum Society ; 2015
    In:  Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films Vol. 33, No. 6 ( 2015-11-01)
    Details
    In: Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, American Vacuum Society, Vol. 33, No. 6 ( 2015-11-01)
    Abstract: A combined simulation and experimental approach is used to investigate vapor deposition onto model doublet guide vane substrates found in gas turbine engines. These substrates contain surface regions that are not visible to the vapor source. Particular attention is given to coatings on interior surfaces of the doublet airfoil geometry, which are only accessible through the leading and trailing openings of the doublet airfoil substrate. Deposition of nickel is simulated for several flow conditions and vane separation distances, using a direct simulation Monte Carlo method. The simulated coating thickness predictions are then evaluated by comparison with experimentally deposited nickel coatings. Coating uniformity along interior surfaces was found to be highly sensitive to deposition conditions, and to the separation distance between the pair of airfoils. Coating thickness on these surfaces were found to vary with the ratio of laminar flow distance through the interairfoil channel to the transverse diffusion distance across the channel gap; a parameter which can be applied to optimize the coating of many interior channel-like substrate using gas jet assisted deposition concepts.
    Type of Medium: Online Resource
    ISSN: 0734-2101 , 1520-8559
    URL: Article
    DOI: 10.1116/1.4929664
    RVK:
    UA 4921
    Language: English
    Publisher: American Vacuum Society
    Publication Date: 2015
    detail.hit.zdb_id: 1475424-1
    detail.hit.zdb_id: 797704-9
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  • 2
    Online Resource
    Online Resource
    Microstructure of vapor deposited coatings on curved substrates
    American Vacuum Society ; 2015
    In:  Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films Vol. 33, No. 5 ( 2015-09-01)
    Details
    In: Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, American Vacuum Society, Vol. 33, No. 5 ( 2015-09-01)
    Abstract: Thermal barrier coating systems consisting of a metallic bond coat and ceramic over layer are widely used to extend the life of gas turbine engine components. They are applied using either high-vacuum physical vapor deposition techniques in which vapor atoms rarely experience scattering collisions during propagation to a substrate, or by gas jet assisted (low-vacuum) vapor deposition techniques that utilize scattering from streamlines to enable non-line-of-sight deposition. Both approaches require substrate motion to coat a substrate of complex shape. Here, direct simulation Monte Carlo and kinetic Monte Carlo simulation methods are combined to simulate the deposition of a nickel coating over the concave and convex surfaces of a model airfoil, and the simulation results are compared with those from experimental depositions. The simulation method successfully predicted variations in coating thickness, columnar growth angle, and porosity during both stationary and substrate rotated deposition. It was then used to investigate a wide range of vapor deposition conditions spanning high-vacuum physical vapor deposition to low-vacuum gas jet assisted vapor deposition. The average coating thickness was found to increase initially with gas pressure reaching a maximum at a chamber pressure of 8–10 Pa, but the best coating thickness uniformity was achieved under high vacuum deposition conditions. However, high vacuum conditions increased the variation in the coatings pore volume fraction over the surface of the airfoil. The simulation approach was combined with an optimization algorithm and used to investigate novel deposition concepts to tailor the local coating thickness.
    Type of Medium: Online Resource
    ISSN: 0734-2101 , 1520-8559
    URL: Article
    DOI: 10.1116/1.4927162
    RVK:
    UA 4921
    Language: English
    Publisher: American Vacuum Society
    Publication Date: 2015
    detail.hit.zdb_id: 1475424-1
    detail.hit.zdb_id: 797704-9
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  • 3
    Online Resource
    Online Resource
    Analytic bond-order potential for predicting structural trends across the s p -valent elements
    American Physical Society (APS) ; 2005
    In:  Physical Review B Vol. 72, No. 14 ( 2005-10-17)
    Details
    In: Physical Review B, American Physical Society (APS), Vol. 72, No. 14 ( 2005-10-17)
    Type of Medium: Online Resource
    ISSN: 1098-0121 , 1550-235X
    URL: Article
    DOI: 10.1103/PhysRevB.72.144105
    RVK:
    UA 6500.3.B
    Language: English
    Publisher: American Physical Society (APS)
    Publication Date: 2005
    detail.hit.zdb_id: 1473011-X
    detail.hit.zdb_id: 2844160-6
    detail.hit.zdb_id: 209770-9
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  • 4
    Online Resource
    Online Resource
    Thermodynamic signatures of the polaron-molecule transition in a Fermi gas
    American Physical Society (APS) ; 2021
    In:  Physical Review A Vol. 103, No. 2 ( 2021-2-9)
    Details
    In: Physical Review A, American Physical Society (APS), Vol. 103, No. 2 ( 2021-2-9)
    Type of Medium: Online Resource
    ISSN: 2469-9926 , 2469-9934
    URL: Article
    DOI: 10.1103/PhysRevA.103.023312
    RVK:
    UA 6500.3A
    Language: English
    Publisher: American Physical Society (APS)
    Publication Date: 2021
    detail.hit.zdb_id: 2844156-4
    detail.hit.zdb_id: 209769-2
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  • 5
    Online Resource
    Online Resource
    X-ray scattering study of Ag/Si(111) buried interface structures
    American Physical Society (APS) ; 1992
    In:  Physical Review Letters Vol. 68, No. 4 ( 1992-1-27), p. 507-510
    Details
    In: Physical Review Letters, American Physical Society (APS), Vol. 68, No. 4 ( 1992-1-27), p. 507-510
    Type of Medium: Online Resource
    ISSN: 0031-9007
    URL: Article
    DOI: 10.1103/PhysRevLett.68.507
    RVK:
    UA 1000
    RVK:
    UA 6520
    Language: English
    Publisher: American Physical Society (APS)
    Publication Date: 1992
    detail.hit.zdb_id: 1472655-5
    detail.hit.zdb_id: 208853-8
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  • 6
    Online Resource
    Online Resource
    Signatures of the orthogonality catastrophe in a coherently driven impurity
    American Physical Society (APS) ; 2021
    In:  Physical Review A Vol. 104, No. 4 ( 2021-10-14)
    Details
    In: Physical Review A, American Physical Society (APS), Vol. 104, No. 4 ( 2021-10-14)
    Type of Medium: Online Resource
    ISSN: 2469-9926 , 2469-9934
    URL: Article
    DOI: 10.1103/PhysRevA.104.043309
    RVK:
    UA 6500.3A
    Language: English
    Publisher: American Physical Society (APS)
    Publication Date: 2021
    detail.hit.zdb_id: 2844156-4
    detail.hit.zdb_id: 209769-2
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  • 7
    Online Resource
    Online Resource
    Thermal barrier coating deposition by rarefied gas jet assisted processes: Simulations of deposition on a stationary airfoil
    American Vacuum Society ; 2013
    In:  Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films Vol. 31, No. 6 ( 2013-11-01)
    Details
    In: Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, American Vacuum Society, Vol. 31, No. 6 ( 2013-11-01)
    Abstract: The uniform coating of a complex shaped substrate, such as a gas turbine airfoil, by collisionless physical vapor deposition processes requires rotation/translation of the substrate or sources and is inconceivable for regions on the substrate that are never in the line-of-sight of the vapor source. Recently developed directed vapor deposition processes use electron beam evaporation and inert gas jets to entrain, transport, and deposit metal oxide vapor in an environment where many vapor atom collisions occur prior to deposition. Direct simulation Monte Carlo simulations and experimental depositions of a rare earth modified thermal barrier coating are used to investigate fundamental aspects of the deposition process, including coating thickness and column orientation, over the surface of a nonrotated model airfoil substrate with substantial non-line-of-sight regions. The coating thickness uniformity was found to depend on the deposition chamber pressure and the pressure ratio between the low-pressure deposition chamber and high-pressure reservoir upstream of the gas jet forming nozzle. Under slow flow conditions, significant coating of the non-line-of-sight regions was possible. The growth column orientation is found to also vary over the substrate surface due to changes in the local incidence angle distribution of depositing vapor atoms. The variation in growth column orientation is not predictable by the Tangent rule widely used for predicting columnar growth orientation in physical vapor deposition processes.
    Type of Medium: Online Resource
    ISSN: 0734-2101 , 1520-8559
    URL: Article
    DOI: 10.1116/1.4819242
    RVK:
    UA 4921
    Language: English
    Publisher: American Vacuum Society
    Publication Date: 2013
    detail.hit.zdb_id: 1475424-1
    detail.hit.zdb_id: 797704-9
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  • 8
    Online Resource
    Online Resource
    Vapor deposition on doublet airfoil substrates: Control of coating thickness and microstructure
    American Vacuum Society ; 2015
    In:  Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films Vol. 33, No. 6 ( 2015-11-01)
    Details
    In: Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, American Vacuum Society, Vol. 33, No. 6 ( 2015-11-01)
    Abstract: Gas jet assisted vapor deposition processes for depositing coatings are conducted at higher pressures than conventional physical vapor deposition methods, and have shown promise for coating complex shaped substrates including those with non-line-of-sight (NLS) regions on their surface. These regions typically receive vapor atoms at a lower rate and with a wider incident angular distribution than substrate regions in line-of-sight (LS) of the vapor source. To investigate the coating of such substrates, the thickness and microstructure variation along the inner (curved) surfaces of a model doublet airfoil containing both LS and NLS regions has been investigated. Results from atomistic simulations and experiments confirm that the coating's thickness is thinner in flux-shadowed regions than in other regions for all the coating processes investigated. They also indicated that the coatings columnar microstructure and pore volume fraction vary with surface location through the LS to NLS transition zone. A substrate rotation strategy for optimizing the thickness over the entire doublet airfoil surface was investigated, and led to the identification of a process that resulted in only small variation of coating thickness, columnar growth angle, and pore volume fraction on all doublet airfoil surfaces.
    Type of Medium: Online Resource
    ISSN: 0734-2101 , 1520-8559
    URL: Article
    DOI: 10.1116/1.4934258
    RVK:
    UA 4921
    Language: English
    Publisher: American Vacuum Society
    Publication Date: 2015
    detail.hit.zdb_id: 1475424-1
    detail.hit.zdb_id: 797704-9
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  • 9
    Online Resource
    Online Resource
    Neutron and X-Ray Small Angle Scattering Studies of Rapidly Quenched La-Fe Alloys
    Physical Society of Japan ; 1997
    In:  Journal of the Physical Society of Japan Vol. 66, No. 2 ( 1997-02-15), p. 451-454
    Details
    In: Journal of the Physical Society of Japan, Physical Society of Japan, Vol. 66, No. 2 ( 1997-02-15), p. 451-454
    Type of Medium: Online Resource
    ISSN: 0031-9015 , 1347-4073
    URL: Article
    DOI: 10.1143/JPSJ.66.451
    RVK:
    UA 4710
    Language: English
    Publisher: Physical Society of Japan
    Publication Date: 1997
    detail.hit.zdb_id: 2042147-3
    SSG: 25
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  • 10
    Online Resource
    Online Resource
    Correlation of Microstructures and Conductivities of Ferroelectric Ceramics Using Complex Impedance Spectroscopy
    IOP Publishing ; 2010
    In:  Japanese Journal of Applied Physics Vol. 49, No. 6R ( 2010-06-01), p. 061505-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 49, No. 6R ( 2010-06-01), p. 061505-
    Abstract: The microstructures and conductivities of lead-free ceramics [Bi 0.5 (Na 1- x K x ) 0.5 ]TiO 3 with x = 0.18 (BNKT) and lead-based ceramics of x (0.94PbZn 1/3 Nb 2/3 O 3 + 0.06BaTiO 3 ) + (1 - x )PbZr y Ti 1- y O 3 with x = 0.5, y = 0.52 (PBZNZT) were investigated. Experimental results show that the activation energy of grain boundary conductivity is higher than that of grain conductivity for the BNKT system, indicating that the Bi 2 O 3 evaporation of grains induces an easy conduction path through grains. However, the activation energy of grain boundary conductivity is lower than that of grain conductivity for the PBZNZT system, which might be attributed to the charged particles in the amorphous phase at grain boundaries, participating in the conduction process. A conduction model of both grain and grain boundary conductivities was proposed, and the microstructural characteristics and AC impedance data of ferroelectric ceramics correlate fairly well, suggesting that impedance spectroscopy is an efficient characterization technique for the grain boundary engineering of ferroelectric ceramics.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.49.061505
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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