X-Ray Diffraction
Sawv cev pawg phiaj xwm ntawm Xray diffraction cov ntaub ntawv ntawm pristine thiab degraded cov qauv rau Hlau (sab laug) thiab Ceramic (Right).
Ceramic center post cartridges, raws li kev kwv yees los ntawm cov kws sau ntawv, tseem nyob ib puag ncig ntawm cov tshuaj muaj pes tsawg leeg (tsis muaj cov cim ntawm decomposition lossis tshuaj hloov pauv ntawm 300 ° C thiab 600 ° C).Ntawm qhov tsis sib xws, cov qauv hlau tau txais kev hloov pauv meej meej.
Raws li tuaj yeem pom los ntawm XRD cov ntaub ntawv, cov qauv ceramic qhia txog cov qauv kev ncaj ncees ntawm cov khoom sib xws.Qhov no yog qhov qhia tau tias tsis muaj kev hloov pauv hauv cov qauv siv lead ua vim qhov kev siv zog thiab qhov siab tshaj plaws ntawm cov dav hlau diffracting tseem zoo ib yam.Siv rietveld refinement, peb pom hauv peb tus qauv XRD qhov tseem ceeb tetragonal theem uas yog ntaus nqi rau (101) dav hlau.
Cov ntaub ntawv XRD kuj qhia tau hais tias muaj me ntsis monoclinic qauv pib tshwm sim rau 600 ° C qauv vim yog (111) dav hlau ntawm lub kaum sab xis 2θ.Hauv kev suav cov mol% ntawm qhov hnyav% (cov ntaub ntawv muab los ntawm Wonder Garden), nws tau txiav txim siab tias tus qauv Zirconia yog 3 mol% Yttria doped Zirconia.Thaum muab piv rau XRD qauv rau daim duab theem peb pom tias cov ntaub ntawv sau los ntawm XRD zoo ib yam nrog cov theem tam sim no nyob rau hauv daim duab theem.Qhov tshwm sim los ntawm peb cov ntaub ntawv XRD qhia tias Zirconia yog cov khoom siv ruaj khov thiab tsis muaj zog hauv qhov kub thiab txias.
Witz Et al: Theem Evolution hauv Yttria-Stabilized Zirconia Thermal Barrier Coatings Kawm los ntawm Rietveld Refinement of X-Ray Powder Diffraction Patterns.Journal of the American Ceramic Society.
■Table 1 - Kev sib xyaw ntawm Ceramic Centerpost
Los ntawm XRD cov ntaub ntawv, nws tau pom tias cov khoom siv hlau yog tooj dag.Rau cov ntawv thov kub kub, nws tuaj yeem yog qhov kev xaiv tsis tu ncua tab sis raws li pom, qhov degradation tshwm sim sai heev piv rau cov ceramic center-post.Raws li tuaj yeem pom hauv cov phiaj xwm ntawm 600 ° C (thawj lub phiaj xwm ntawm sab laug sab laug), cov khoom tau hloov pauv loj heev.Thaum lub kaum sab xis qis 2θ, peb ntseeg tias cov peaks tshiab tau raug ntaus nqi los ntawm kev tsim ZnO (Zinc Oxide).Ntawm 300 ° C rau cov qauv tooj dag (sab laug XRD zaj duab xis) peb pom tias tsis muaj ntau qhov kev hloov pauv tau tshwm sim nyob rau hauv kev sib piv rau cov qauv pristine.Cov qauv tseem nyob hauv lub cev zoo thiab tshuaj lom neeg, qiv rau cov ntaub ntawv ruaj khov los ntawm chav tsev kub txog 300 ° C.
