Evolution of pore microstructure in thermal barrier coatings studied by SANS

0079126 - ÚJF 2008 RIV NL eng J - Journal Article
Haug, J. - Wiedenmann, A. - Flores, A. - Saruhan-Brings, B. - Strunz, Pavel
Evolution of pore microstructure in thermal barrier coatings studied by SANS.
[Vývoj mikrostruktury pórů v tepelně ochranné vrstvě studovaný maloúhlovým rozptylem neutronů.]
Physica B-Condensed Matter. Roč. 385, č. 1 (2006), s. 617-619. ISSN 0921-4526. E-ISSN 1873-2135
R&D Projects: GA ČR GA202/06/0601
Institutional research plan: CEZ:AV0Z10480505
Keywords : thermal barrier coatings * electron beam physical vapor deposition * SANS
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 0.872, year: 2006

Two different sample morphologies, resulting from different EB-PVD process parameters, were investigated by SANS in the as-coated condition and after heat treatment at 1100 degrees C for 1, 10 and 100h. SANS measurements perpendicular to the surface show highly anisotropic 2-D pattern which vary for the different morphologies. Quantitative information of the surface area were determined by converting the 2-D data to 1-D scattering patterns averaged over sectors of 5 degrees and calculating the apparent Porod constant as a function of the angle. The apparent Porod constants show a preferred orientation of the pores in the as-coated conditions and a decreasing surface area for the heat treated samples. The corrected anisotropic 2-D data were fitted with a 3-D structure model to receive the interface orientation distribution of the pores. The shape of the pores changes with increasing temperature and time.

Vývoj mikrostruktury pórů v tepelně ochranné vrstvě studovaný maloúhlovým rozptylem neutronů.
Permanent Link: http://hdl.handle.net/11104/0143998