SYNTHESIZE AND STUDY THE EFFECTS OF SINTERING ON PHASE TRANSFORMATION AND MACROSTRUCTURE BEHAVIOR OF LANTHANUM ZIRCONATE TBC POWDERS
Keywords:
TBC, Zirconate materials, Powders Preparation, % Porosity, XRD, SEM, Sedigraph MethodAbstract
Zirconate is the new advanced alternative material for thermal barrier coatings above 13500 C. In the present research work we focused on to develop a Lanthanum Zirconate and La2O3 have been used as the dopant or stabilizer to zirconia powder. Various characterization tests have been conducted such as structural phases using XRD, Microstructures by SEM, particle size analysis by sedigraph method, and finally it shall be evaluated for particle size, densification, porosity etc. to optimize and determine the dopant concentration for partial or full stabilization of Zirconia. To study the effect of stabilization of Zirconia, two methods have been followed: Powder preparation by Agate jar mixing and high-energy planetary wet ball mill. In Agate jar, stabilization of Zirconia is very less due to higher particle size and higher calcinations temperature of 16250C for four hours. In wet ball milling method, the particles are well grinded (5- microns) and calcined at 15500C for four hours. It is found that 98% of Zirconate formed which is most suitable for the TBC applications
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