Moskal, G (2010) Microstructural characteristics and technological properties of YSZ-type powders designed for thermal spraying of TBC. IOP Conference Series: Materials Science and Engineering, 7 (1). 012019.
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Official URL: http://stacks.iop.org/1757-899X/7/i=1/a=012019
This paper presents the experimental results relating to the microstructural characteristics and selected technological properties of yttria and partially stabilized zirconia (YSZ)-type powders designed for spraying thermal barrier coating (TBC) layers with the atmospheric plasma spraying (APS) method. Three types of powders with the following chemical compositions â ZrO 2 Ã 8Y 2 O 3 , ZrO 2 Ã 20Y 2 O 3 , and "nano" ZrO 2 Ã 8Y 2 O 3 â were subjected to analysis. Assessment of the surface morphology and inner structure of the powder particles was performed by scanning electron microscopy. The chemical composition of the powders was determined by energy-dispersive X-ray spectroscopy and inductively coupled plasma-optical emission spectroscopy (EDS and ICP-OES, respectively), with special attention focussed on the degree of uniformity in the arrangement of the alloy elements and the contents of carbon, sulphur, oxygen and nitrogen. The phase compositions were also analysed by using X-ray diffraction (XRD) and electron backscattered diffraction (EBSD). The technological properties describing density and friability of the analysed powders were assessed. The study showed that the analyzed conventional powders were predominantly characterized by spherical-shaped particles and single deformed particles. The surface of the conventional powder (8YSZ) was smooth with no porosity. The inner structure had a solid and clear grain structure with single voids. The 20YSZ-type powder showed a structure that typically arose from the agglomeration process. The surface was rough with noticeable voids, and the powder inner structure had a similar appearance. The nanostructured powder particles had a polyhedral shape that was typical of the grinding process. From the chemical composition analysis the powder materials had high metallurgical purity, and the alloy elements were uniformly arranged. The XRD phase composition analysis and the EBSD microanalysis confirmed the predominant presence of the ZrO 2 tetragonal phase in the YSZ powders and the cubic phase in the 20YSZ powder.
|Deposited By:||Prof. Alexey Ivanov|
|Deposited On:||01 Nov 2011 23:30|
|Last Modified:||02 Nov 2011 00:47|
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