Effect of platinum on sintering morphology of porous YSZ ceramics

Abstract

Platinum/yttria-stabilized zirconia (Pt/YSZ) porous ceramics were prepared by sintering of the Pt/PMMA/YSZ stripe-like membrane with a porogen of spherical polymethyl methacrylate (PMMA) and a precursor of platinum (Pt) of chloroplatinic acid. The microstructure of raw and processed material and Pt/ZrO₂ calcination process at different sintering temperatures were investigated. The results showed that the spherically porous structure of Pt/YSZ was observed at a sintering temperature below 400 °C due to the thermal decomposition of PMMA. However, the pores were shrunk about 35% in diameter when YSZ compacts were sintered at the temperature of 1,450 °C. In addition, the spherical pores can be retained in the compacts when the content of Pt <5% and then gradually merged into changing when the content of Pt increased to 50%. The relative density was increased from 42% to 90% and the open porosity was decreased from 60% to 10% when Pt was added with content from 5% to 80%. The change of microstructure for Pt/YSZ is due to the migration of Pt and YSZ in the composites. The preferential migration and coalescence proceeded for Pt in Pt/YSZ is about 500 °C and YSZ clusters can keep stable until up to 900 °C. However, the growth of YSZ particle in the sintering process was hindered by the scattering of Pt phase.

The pore relies on the amount of metal Pt.

Migration and coalescence proceeded for Pt species are proposed.

The particle growth relates to temperature.

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