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Author: andrew allen

Displaying records 51 to 60 of 69 records.
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51. Microstructural Characterization Studies to Relate the Properties of Thermal Spray Coatings to Feedstock and Spray Conditions
Published: 9/1/2001
Authors: Andrew John Allen, Gabrielle Gibbs Long, H Boukari, J Ilavsky, A Kulkarni, S Sampath, H Herman, A N Goland
Abstract: This paper reports how the microstructural information, obtainable for thick plasma-sprayed ceramic deposits by small-angle scattering can be used to explore the relationships among the feedstock or spray process conditions, the anisotropic void and ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850500

52. The Ultra-Small-Angle X-Ray Scattering Instrument on UNICAT at the APS
Published: 10/1/2000
Authors: Gabrielle Gibbs Long, Andrew John Allen, J Ilavsky, P R Jemian, P Zchack
Abstract: A new ultra-small-angle X-ray scattering (USAXS) instrument has been commissioned as part of the UNICAT facility on the 33-ID line at the Advanced Photon Source. The instrument offers continuously-tunable optics for anomalous USAXS, 1000 times the t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850358

53. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851125

54. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850309

55. 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, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850245

56. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850247

57. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850156

58. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850569

59. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850238

60. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850157



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