%0 Journal Article
%T ImprovementofFractureToughnessLanthanumZirconate
%A LIJY
%A DAIH
%A LIQ
%A ZHONGXH
%A CAOXQ
%J ²ÄÁϹ¤³Ì
%D 2006
%X La2Zr2O7(LZ)isapromisingthermalbarriercoatingmaterialforthehightemperatureapplications.ThefracturetoughnessandmicrohardnessofnanocrystallineLZ(n-LZ),microcrystallineLZ(m-LZ)andLZ-5mol%8YSZ(LZ-5-8YSZ)composite(8YSZforzirconiastabilizedby8mol%ytrria)werestudied.Then-LZhadathermalexpansioncoefficientof(9.6¡À0.4)¡Á10-6K-1(200¡«1000¡æ)andfracturetoughnessof(1.98¡À0.07)MPa¡¤m1/2whichareobviouslyhigherthanthoseofthem-LZ((9.1¡À0.4)¡Á10-6K-1and(1.40¡À0.23)MPa¡¤m1/2,respectively),indicatingthatnanoficationwasanefficientwaytoincreasethetoughnessandthermalexpansioncoefficientofLZ.ThecompositeLZ-5-8YSZhadahigherfracturetoughness((1.88¡À0.30)MPa¡¤m1/2)thanLZ,whichwasclosetothatof8YSZdensifiedbysuperhighpressure(SHP).
%K ceramics
%K nanostructure
%K fracturetoughness
%K thermalexpansion
%U http://jme.biam.ac.cn/CN/Y2006/V0/I5/51