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You searched on: Author: andrew allen

Displaying records 51 to 60 of 81 records.
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51. 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 ...

52. 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 ...

53. 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 ...

54. 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 ( ...

55. 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 ...

56. 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 ...

57. Multiple Small-Angle Neutron Scattering Studies of Anisoptropic Materials
Published: 12/1/2002
Authors: Andrew John Allen, Norman F. 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 ...

58. Effective Pinhole-Collimated Ultra-Small-Angle X-Ray Scattering Instrument for Measuring Anisotropic Microstructures
Published: 3/1/2002
Authors: J Ilavsky, Andrew John Allen, Gabrielle Gibbs Long, P Jemain
Abstract: Small-angle scattering is widely used for measuring materials microstructure in the 1 nm to 100 nm size range. Ultra-small-angle x-ray scattering (USAXS), typically achieved through crystal collimation, extends this size range to include features ove ...

59. Neutron Methods Link Microstructure to Processing and Performance for Thermal Barrier Coatings
Series: Journal of Research (NIST JRES)
Published: 1/1/2002
Author: Andrew John Allen
Abstract: Although coatings are used in the electric utility and aircraft industries to protect advanced gas turbines from increasingly high operating temperatures, there is presently no single industrial technique that can quantify the component void microstr ...

60. National Institute of Standards and Technology Synchrotron Radiation Facilities for Materials Science
Series: Journal of Research (NIST JRES)
Published: 12/1/2001
Authors: Gabrielle Gibbs Long, Andrew John Allen, David R Black, H E. Burdette, Daniel A Fischer, R D Spal, Joseph C Woicik
Abstract: Synchrotron Radiation Facilities, supported by the Materials Science and Engineering Laboratory of the National Institute of Standards and Technology, include beam stations at the National Synchrotron Light Source at Brookhaven National Laboratory an ...

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