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SYNTHESIZE AND SURFACE CHARACTERIZATION OF Pr2O3 (20%) AND La2O3 (58.97%) DOPED ZrO2

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Author(s): K.M.PURUSHOTHAMA, | Dr. SHIVARUDRAIAH, | Dr. P.MARTIN JEBARAJ

Journal: International Journal of Engineering Science and Technology
ISSN 0975-5462

Volume: 3;
Issue: 3;
Start page: 2236;
Date: 2011;
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Keywords: Thermal Barrier Coating | Zirconate | Powders Preparation Methods | XRD | EDAX

ABSTRACT
Zirconia (ZrO2) doped with oxides of Yttria, Calcia, Magnesia are well established systems for Thermal Barrier Coating (TBC) applications. TBCs are generally used in aero engines and in space vehicle and heavy duty diesel engine components to protect them from the severe degradation arising due to high temperature environment.The well known 7-8 % YPSZ (Yttria Partially Stabilized Zirconia) TBC under goes reversible phase transformation from tetragonal to monoclinic, due to which the coating becomes unstable. To over come this problem in the present research focused on to find the lternative materials such as Lanthanum and Praseodymium oxide has been used as a dopant or stabilizer to Zirconia at various ercentages. Lanthanum and Praseodymium zirconate (La2Zr2O7, Pr2Zr2O7) is a newly proposed material for thermal barrier coatings (TBCs). Automobile diesel engine application. Various characterization tests such as XRD, EDAX, and Particle Size Analysis have been conducted after calcinated for various temperater.To optimize and determine the dopant concentration for partial or full stabilization of Zirconia and to study the stabilization effect of Zirconates two methods have been followed. first method,Powder prepared by agate jar mixing., second method Powder prepared by wet ball milling in the first method zirconate is not formed for calcinations temperature of 16150 C and in the second method Ziconate formed at the optimum calcinations temperature of 14150C.
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