Preparation and characterization of nanocrystalline ZrO2-7%Y2O3 powders for thermal barrier coatings by high-energy ball milling

doi:10.1007/s11465-011-0220-4

Front Mech Eng

2011, Vol. 6

Issue (2) : 176-181 https://doi.org/10.1007/s11465-011-0220-4

RESEARCH ARTICLE

Preparation and characterization of nanocrystalline ZrO₂-7%Y₂O₃ powders for thermal barrier coatings by high-energy ball milling

Kirsten BOBZIN, Lidong ZHAO(

), Thomas SCHLAEFER, Thomas WARDA

Surface Engineering Institute, RWTH Aachen University, 52072 Aachen, Germany

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Abstract

High-energy ball milling is an effective method to produce nanocrystalline oxides. In this study, a conventional ZrO₂-7%Y₂O₃ spray powder was ball-milled to produce nanocrystalline powders with high levels of crystalline disorders for deposition of thermal barrier coatings. The powder was milled both with 100Cr6 steel balls and with ZrO₂-3%Y₂O₃ ceramic balls as grinding media. The milling time was varied in order to investigate the effect of the milling time on the crystallite size. The powders were investigated in terms of their crystallite sizes and morphologies by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that under given milling conditions the powder was already nanostructured after 40 min milling. The crystallite size decreased significantly with increasing milling time within first 120 min. After that, a further increase of milling time did not lead to a significant reduction of the crystallite size. Ball-milling led to lattice microstrains. Milling with the steel balls resulted in finer nano-sized crystal grains, but caused the contamination of the powder. The nano-sized crystal grains coarsened during the heat-treatment at 1250°C.

Keywords nanostrucured powders yttria stabilized zirconia (YSZ) high-energy ball milling thermal barrier coatings

Corresponding Author(s): ZHAO Lidong,Email:zhao@iot.rwth-aachen.de

Issue Date: 05 June 2011

Cite this article:

Kirsten BOBZIN,Thomas SCHLAEFER,Thomas WARDA, et al. Preparation and characterization of nanocrystalline ZrO₂-7%Y₂O₃ powders for thermal barrier coatings by high-energy ball milling[J]. Front Mech Eng, 2011, 6(2): 176-181.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-011-0220-4
https://academic.hep.com.cn/fme/EN/Y2011/V6/I2/176

Fig.1 X-ray diffraction pattern of the ZrO-7%YO starting powder

Fig.2 X-ray diffraction pattern of the powder after 40 min milling with the steel balls

Fig.3 X-ray diffraction pattern of the powder after 120 min milling with the steel balls

Fig.4 X-ray diffraction pattern of the powder after 600 min milling with the steel balls

Fig.5 X-ray diffraction pattern of the powder after 40 min milling with the ceramic balls

Fig.6 X-ray diffraction pattern of the powder after 120 min milling with the ceramic balls

Fig.7 X-ray diffraction pattern of the powder after 600 min milling with the ceramic balls

Fig.8 EDX-measurement on the powder after 40 min milling with the steel balls

Fig.9 Calculated crystallite sizes via milling time

Tab.1 Calculated lattice microstrains of the milled powders

Fig.10 SEM micrograph of the starting powder

Fig.11 SEM micrograph of the powder after 40 min milling with the steel balls

Fig.12 SEM micrograph of the powder after 600 min milling with the steel balls

Fig.13 SEM micrograph of the powder after 60 min milling in a 100000-fold magnification

Fig.14 TEM micrographs of the powder after 600 min milling with the ceramic balls

Fig.15 X-ray diffraction pattern of the powder after the heat-treatment

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