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yttria stabilized zirconia (YSZ) 2

Al₂O₃ 1

X1CrTiLa22 1

aluminum 1

extrusion 1

high-energy ball milling 1

milling 1

nanostrucured powders 1

oxide dispersion strengthened (ODS) steel 1

reactive air brazing (RAB) 1

solid oxide fuel cell (SOFC) 1

thermal barrier coatings 1

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Development of oxide dispersion strengthened ferritic steels with and without aluminum

Jae Hoon LEE

Frontiers in Energy 2012, Volume 6, Issue 1, Pages 29-34 doi: 10.1007/s11708-012-0178-x

Abstract: The dispersed oxide particles were identified to be titania+ yttria for Al-free oxide dispersion strengthened(ODS) steel and alumina+ yttria for Al-added ODS steel, respectively.

Keywords： oxide dispersion strengthened (ODS) steel milling extrusion aluminum yttria

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Brazing of ceramic-to-ceramic and ceramic-to-metal joints in air

Kirsten BOBZIN, Thomas SCHLAEFER, Lidong ZHAO, Nils KOPP, Arne SCHLEGEL

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 2, Pages 125-129 doi: 10.1007/s11465-010-0007-z

Abstract: and AgCuTi braze alloys could also be used to produce brazed joints with the SOFC materials ceramic yttria

Keywords： reactive air brazing (RAB) X1CrTiLa22 Al₂O₃ yttria stabilized zirconia (YSZ) solid

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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

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 2, Pages 176-181 doi: 10.1007/s11465-011-0220-4

Abstract:

High-energy ball milling is an effective method to produce nanocrystalline oxides. In this study, a conventional ZrO₂-7%Y₂O₃spray 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