Plasma spraying of an indigenous yttria stabilized zirconia powder prepared by the sol-gel technique

• An indigenous sol-gel derived yttria-partially stabilized zirconia (Y-PSZ) powder has been characterized and its suitability for plasma spraying applications evaluated. The powder, determined to have about 5·1% yttria content, predominantly consisted of spherical particles with an average equivalent particle diameter close to 25 μm. Furthermore, it was found that the powder did not contain any particles >50 μm, which is considered the ideal upper size limit for spray-grade ceramic powders in order to ensure complete melting during spraying. The sol-gel produced powder exhibited good flow characteristics and the plasma sprayed coatings developed using this powder were also found to have excellent thermal shock resistance. The corresponding results obtained using an imported Y-PSZ powder are also presented for the purpose of comparison. © 1993 Indian Academy of Sciences.

Nyckelord

Plasma spraying

sol-gel technique

thermal barrier coatings

yttria-stabilized-zirconia

Ceramic coatings

Heat resistance

Particle size analysis

Powders

Protective coatings

Sol-gels

Yttrium compounds

Sol gel technique

Thermal shock resistance

Yttria-stabilized zirconia (YSZ)

Zirconia

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