March 3, 2026Journal of the Japan Society of Powder and Powder Metallurgy0 citationsOpen Access

Low Temperature Formation of Dense Yttria-Stabilized Zirconia Layer Using Hot Isostatic Pressing

KMKyohei ManabeOsaka Gas (Japan)MEMitsuaki EchigoOsaka Gas (Japan)AKAkira KISHIMOTOOkayama University of Science

Key Points

A dense yttria-stabilized zirconia layer was achieved with a relative density of 93% at 1000°C for 10 hours with hot isostatic pressing.
The process used a pressure of 195 MPa during sintering, which is notable for yielding high-density zirconia.
X-ray diffraction analysis showed peaks of both monoclinic and cubic phases, indicating phase transformation due to sintering conditions.
The presence of boron detected through energy dispersive X-ray spectroscopy suggests its role in the phase transformation during the HIP process.

Abstract

The sintering conditions using hot isostatic press (HIP) of yttria-stabilized zirconia (YSZ) were investigated to obtain a dense YSZ layer at low sintering temperature such as 1000°C for an electrolyte of metal-supported solid oxide fuel cell. It was found that a dense YSZ pellet with relative density of 93% could be obtained under a sintering condition of 1000°C-10 hours with HIP in 195 MPa. On the other hand, in X-ray diffraction analysis of the dense YSZ pellet, peaks of the monoclinic phase were slightly detected in addition to peaks of the cubic phase. From energy dispersive X-ray spectroscopy analysis, a small amount of boron was detected in the dense YSZ pellet. It is considered that the YSZ crystalline phase transformation of cubic to monoclinic phase was occurred by the boron diffusion from the diffusion barrier coating of metal foil capsule used for the HIP.

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