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Author: andrew allen

Displaying records 41 to 50 of 73 records.
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41. In Situ Quasi-Elastic Scattering Characterization of Particle Size Effects on the Hydration of Tricalcium Silicate
Published: 11/1/2004
Authors: Andrew John Allen, J C McLaughlin, Dan A. Neumann, Richard A Livingston
Abstract: The effects of different particle size distributions on the real-time hydration of tricalcium silicate cement paste have beenstudied in situ by quasi-elastic neutron scattering. The changing state of water in the cement system is followed as a functi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850753

42. Microstructure-Property Correlations in Industrial Thermal Barrier Coatings
Published: 7/1/2004
Authors: A Kulkarni, A N Goland, H Herman, Andrew John Allen, J Ilavsky, Gabrielle Gibbs Long, C A Johnson, J A Ruud
Abstract: This paper describes the results from multidisciplinary characterization/scattering techniques employed for the quantitative characterization of industrial thermal barrier coating (TBC) systems used in advanced gas turbines. While past requirements ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850690

43. Studies of the Microstructure and Properties of Dense Ceramic Coatings Produced by High-Velocity Oxgen-Fuel Combustion Spraying
Published: 3/1/2004
Authors: A Kulkarni, J Gutleber, S Sampath, A N Goland, W B Lindquist, H Herman, Andrew John Allen, B A Dowdy
Abstract: High-velocity oxygen-fuel (HVOF) spraying stands out among the various processes to improve metal and ceramic coating density and surface characteristics. This paper explores microstructure development, coating characterization and properties of HVOF ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850778

44. Effects of Decalcification on the Microstructure and Surface Area of Cement and Tricalcium Silicate Pastes
Published: 1/15/2004
Authors: J Thomas, J J Chen, Hamlin M Jennings, Andrew John Allen
Abstract: Thin coupons of white portiand cement (WPC) and tricalcium silicate paste were decalcified by leaching in concentratedammonium nitrate solutions, resulting in calcium-to-silicon molar ratios (Ca/Si) ranging from 3.0 (control) down to 0.3. Themicrostr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850714

45. Comprehensive Microstructural Characterization and Predictive Property Modeling of Plasma-Sprayed Zirconia Coatings
Published: 5/1/2003
Authors: A Kulkarni, Z G Wang, T Nakamura, S Sampath, A N Goland, H Herman, Andrew John Allen, J Ilavsky, Gabrielle Gibbs Long, J Frahm, R W Steinbrech
Abstract: Quantitative microstructure characterization to better understand processing-microstructure-property correlations is of considerable interest in plasma sprayed coating research. This paper quantifies, by means of small-angle neutron scattering (SANS ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850653

46. Small-Angle Neutron Scattering Study of the Role of Feedstock Particle Size on the Microstructural Behavior of Plasma-Sprayed Yttria-Stabilized Zirconia Deposits
Published: 3/1/2003
Authors: H Boukari, Andrew John Allen, Gabrielle Gibbs Long, J Ilavsky, Jay S Wallace, C C Berndt, H Herman
Abstract: The microstructures of thick plasma-sprayed yttria-stabilized (8% mass) zirconia deposits have been studied in a series of Porod small-angle neutron scattering (SANS) and multiple small-angle neutron scattering (MSANS) experiments. Three main void c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850656

47. Agglomerate Formation During Drying
Published: 2/1/2003
Authors: A Vertanessian, Andrew John Allen, M J Mayo
Abstract: The evolution of agglomerate structure during drying of particles from suspension has been studied for a nanocrystalline Y2O3 (8 mol %)-stabilized ZrO2 powder. Agglomerates in drying and dried suspensions were examined at the smallest size scales ( ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850624

48. Recent Developments in the Characterization of Anisotropic Void Populations in Thermal Barrier Coatings Using Ultra-Small Angle X-ray Scattering
Published: 1/1/2003
Authors: Gabrielle Gibbs Long, T A Dobbins, Andrew John Allen, J Ilavsky, P Jemain, A Kulkarni, H Herman
Abstract: Thermal barrier coatings (TBC) have complex void microstructures which control their in service properties. In the research reported here, ultra-small-angle X-ray scattering (USAXS) has been used to characterize anisotropic void populations in TBC s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850719

49. Characterisation of Thermally Sprayed Metallic NiCrAlY Deposits by Multiple Small-Angle Scattering
Published: 12/1/2002
Authors: T Keller, W. Wagner, Andrew John Allen, J Ilavsky, S Siegmann, N Margadant, G Kostorz
Abstract: The technique of multiple small-angle neutron scattering (MSANS), so far successfully applied to thermal-spray ceramics, has now been extended to thermal-spray metallic deposits. The samples under investigation are technologically relevant Ni-based ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850535

50. Multiple Small-Angle Neutron Scattering Studies of Anisoptropic Materials
Published: 12/1/2002
Authors: Andrew John Allen, Norman Frederic Berk, J Ilavsky, Gabrielle Gibbs Long
Abstract: Various authors have recognized the power of multiple small-angle neutron scattering (MSANS) analysis in providing information on coarse, concentrated microstructures involving micrometer length-scales larger than are accessible in conventional small ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851122



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