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You searched on: Author: andrew allen

Displaying records 61 to 70 of 78 records.
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61. Microstructural Characterization of Yttria-Stabilized Zirconia Plasma-Sprayed Deposits Using Multiple Small-Angle Neutron Scattering
Published: 5/1/2000
Authors: Andrew John Allen, J Ilavsky, Gabrielle Gibbs Long, Jay S Wallace, C C Berndt, H Herman
Abstract: Density, electron microscopy, elastic modulus, and small-angle neutron scattering studies are used to characterize the microstructures of yttria-stabilized zirconis plasma-sprayed deposits as a function fo both feedstock morphology and annealing. In ...

62. Anisotropic Small-Angle Neutron Scattering Studies of Ceramics
Published: 10/1/1999
Authors: Andrew John Allen, Lin-Sien H Lum, K T Faber, M H Zimmerman, Jay S Wallace
Abstract: This paper discusses how small-angle neutron scattering studies can be applied in two variations to obtain a representative characterization of the large, densely-populated, and anisotropic features that occur in the microstructures of various materi ...

63. Microstructural Changes in YSZ Deposits During Annealing
Published: 3/1/1999
Authors: Andrew John Allen, J Ilavsky, Gabrielle Gibbs Long, Jay S Wallace, C C Berndt, H Herman
Abstract: Various methods have been applied to the microstructural characterization of thermally-sprayed depostis. However, coexisting anisotropic distributions of intra-splat cracks and interlamellar pores, and the broad size range of rounded globular pores, ...

64. The Role of Feedstock Particle Size on the Microstructural Behavior of Plasma-Sprayed YSZ Deposits During Annealing
Published: 3/1/1999
Authors: H Boukari, Andrew John Allen, Gabrielle Gibbs Long, J Ilavsky, Jay S Wallace, C C Berndt, H Herman
Abstract: We have studied the microstructure of thick plasma-sprayed yttrium-stabilized zirconia deposits fabricated from different initial feedstock particle size (32, 47, 56 and 88) m in a series of mulitiple and Porod small-angle neutron scattering experim ...

65. The Surface Area of Cement Paste as Measured by Neutron Scattering -- Evidence for Two C-S-H Morphologies
Published: 10/1/1998
Authors: J Thomas, Hamlin M Jennings, Andrew John Allen
Abstract: Small-angle neutron scattering was used to measure the effect of water-to-cement ratio [w/c] and cement batch variation on the surface area of ordinary Portland cement [opc] paste after hydration for 28 days at room temperature, and to measure the de ...

66. Multiple Small-Angle Neutron Scattering
Published: 9/1/1998
Authors: Gabrielle Gibbs Long, Susan T Krueger, Andrew John Allen
Abstract: Over the past decade, a multiple small-angle neutron scattering (MSANS) formalism has been developed to enable researchers to derive microstructural parameters from multiply-scattered small-angle neutron data. The MSANS formalism is particularly use ...

67. Determination of the Neutron Scattering Contrast of Hydrated Portland Cement Paste Using H^d2^0/D^d2^0
Published: 6/1/1998
Authors: J Thomas, Hamlin M Jennings, Andrew John Allen
Abstract: Accurate measurements of the surface area of cement based materials using small-angle neutron scattering (SANS) require determination of the neutron scattering contrast between the C-S-H gel and H6d2^O. Because the C-S-H gel has a poorly understood ...

68. Anisotropic Microstructure of Plasma-Sprayed Deposits
Published: 4/1/1998
Authors: J Ilavsky, Gabrielle Gibbs Long, Andrew John Allen, L Leblanc, M Prystay, C Moreau, Alan H Band
Abstract: The microstructure of plasma-sprayed deposits [PSD] is dominated by two void systems-interlamellar pores and intralamellar cracks - each with a different anisotropy. Varying anisotropies and crack-to-pore ratios within PSDs are responsible for the a ...

69. USAXS Studies of Silica Fume Additives in Cements and Concrete
Published: 4/1/1998
Authors: Andrew John Allen, Richard A Livingston
Abstract: Supplementary cementitious materials like silica fume, which are added to the cement mix and react with calcium ions in the pore solution, enhance the production of calcium-silicate-hydrate gel and modify the microstructure in other ways. By combinin ...

70. Evolution of the Microstructure of Plasma-Sprayed Deposits During Heating
Published: 1/1/1998
Authors: Gabrielle Gibbs Long, Andrew John Allen, J Ilavsky
Abstract: The evolution of the void microstructure of yttria-stabilized zirconia [YSZ] plasma-sprayed deposits [PSD] was studied as a function of heating in air from room temperature to 1400 C, and during a constant temperature hold at 1100 C for 19 hours. ...

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