Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/41679

Title

Use of small-angle neutron scattering for the characterization of anisotropic structures produced by thermal spraying

Author(s)

Ilavsky, Jan;  Long, Gabrielle G.;  Allen, Andrew J.;  Herman, Herbert;  Berndt, Christopher C.

Abstract

Results for the microstructural characterization of thermal spray deposits, using small-angle neutron scattering (SANS), mercury-intrusion porosimetry, and image analysis of polished cross sections, are compared. The alumina and yttria-stabilized zirconia deposits studied were produced by two different atmospheric plasma-spraying methods - using gas-stabilized and water-stabilized plasma systems. The void microstructure of these deposits is dominated by two anisotropic void types - interlamellar pores and intralamellar cracks. There is also a broad distribution of spherical pores. The relative importance of these void systems is found to depend on the materials chemistry and on the spray technique. The surface area of the anisotropic voids was determined using SANS. By varying the spray technique and material, deposits with different dominant void systems were produced. The alumina deposits, manufactured by a high-power water-stabilized plasma-spray system, consisted of a microstructure dominated by intralamellar cracks; the same material deposited by a standard lower-power gas-stabilized plasma-spray system has about equal surface area in the intralamellar cracks and interlamellar voids. However, the zirconia deposit microstructure is always dominated by inerlamellar voids.

Publication type

Journal article

Source

Ceramics-Silikaty, Vol. 42, no. 3 (1998), pp. 81-89

Publication year

1998

Keyword(s)

Alumina;  Anisotropy;  Cracks;  Crystal microstructure;  Deposition;  Image analysis;  Mercury-intrusion porosimetry;  Neutron scattering;  Plasma spraying;  Porosity;  SANS;  Small-angle neutron scattering;  Sprayed coatings;  Thermal spraying;  Zirconia

Publisher

S. K. Press V. O. S.

ISSN

0862-5468

Publisher URL

http://www.ceramics-silikaty.cz/1998/1998_03_081.htm

Peer reviewed