X-ray and SEM studies on zirconia powders

• Autorzy: Dercz G. , Prusik K. , Pająk L.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The microstructure characterization of commercially available zirconia powders was the purpose of this paper. Different methods of structure analysis were applied owing to the complex, multiphase structure of studied materials. Design/methodology/approach: The X-ray diffraction (XRD) and scanning electron microscopy (SEM) investigations were performed on three commercial zirconia ceramic materials: Amdry 204 NS (ZrO2~ 8 wt.% of Y2O3), Metco C8 YZ (ZrO2~ 8 wt.% of Y2O3) and Metco 202 (ZrO2~ 20 wt.% of Y2O3). The Rietveld method appeared to be very useful in the verification of the qualitative phase composition and in the determination of phase abundance. Hill and Howard procedure was applied for quantitative phase analysis. The parameters of the individual diffraction line profiles were determined by PRO-FIT Toraya procedure. The powder morphology was analyzed by SEM method. Findings: In the Amdry sample comparable contents of two phases: monoclinic (44.1 wt.%) and cubic (55.9 wt.%) was stated by XRD analysis. The presence of Y2O3 phase besides of monoclinic, tetragonal and cubic ZrO2 ones were stated for both Metco samples. The tetragonal phase (55.2 wt.%) was found to be the main component of the Metco C8-YZ sample whereas the content of Y2O3 is the lowest (2.7 wt.%). On the other hand cubic phase (68.2 wt.%) was the main component of the Metco 202 sample and the content of Y2O3 is again the lowest (4.5 wt.%). The SEM images of all the samples reveal the spherical shape of powder particles. The morphology of both Metco samples is quite similar. For Metco 202 sample the hierarchical type structure of powder particle is observed; the greater particles contain smaller ones. The shell of particles is composed of distinct patches. On the other hand the structure of spherical particles of Amdry sample is of branched, rather dense skeleton type. From X-ray diffraction data it can be concluded that the crystallite size of all involved phases lies above nanoscale. Practical implications: Performed studies enable the determination of the relation between the microstructure of commercial powders and their utilisable properties. Originality/value: The applied, different methods of structure analysis appeared to be very useful in the microstructure analysis of complex, multiphase material.

Słowa kluczowe

EN

X-ray phase analysis; electron microscopy; Rietveld method; Toraya procedure; ceramics

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2008
• Tom: Vol. 31, nr 2
• Strony: 408--414
• Opis fizyczny: Bibliogr. poz., wykr.

Twórcy

autor

Dercz G.

autor

Prusik K.

autor

Pająk L.

• Institute of Materials Science, University of Silesia, ul. Bankowa 12, 40-007 Katowice, Poland,

Bibliografia

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