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1997•IEEJ Transactions on Power and EnergyOpen access

Influence of Pre-Sintering Conditions of YSZ on the Several Characteristics of Ni/YSZ Cermets

Toshio Matsushima, Masaya Takahashi

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Abstract

For the purpose of improving the strengh of Ni/YSZ cermets, pre-sintered YSZ was applied to the cermets and relationship between pre-sintering conditions of YSZ, sintering conditions and properties of the cermet was investigated. Results revealed the bending strengh of the cermets can be increased by more than 10%, by using the YSZ pre-sintered at suitable condition. Pre-sintering has promoted the reaction between the primary particles in the YSZ granule, and resultantly suppressed the sinterability of YSZ. Pre-sintered YSZ granule was observed to maintain its spherical shape easily in the cermets. Conductivity was also improved, compared to that of conventional Ni/YSZ cermets which is made of raw YSZ. The reason for this phenomena is thought that Ni particles make a distinct conductive network in this new cermet. These cermets also provide adequate porosity.

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For the purpose of improving the strengh of Ni/YSZ cermets, pre-sintered YSZ was applied to the cermets and relationship between pre-sintering conditions of YSZ, sintering conditions and properties of the cermet was investigated. Results revealed the bending strengh of the cermets can be increased by more than 10%, by using the YSZ pre-sintered at suitable condition. Pre-sintering has promoted the reaction between the primary particles in the YSZ granule, and resultantly suppressed the sinterability of YSZ. Pre-sintered YSZ granule was observed to maintain its spherical shape easily in the cermets. Conductivity was also improved, compared to that of conventional Ni/YSZ cermets which is made of raw YSZ. The reason for this phenomena is thought that Ni particles make a distinct conductive network in this new cermet. These cermets also provide adequate porosity.

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Available abstract

For the purpose of improving the strengh of Ni/YSZ cermets, pre-sintered YSZ was applied to the cermets and relationship between pre-sintering conditions of YSZ, sintering conditions and properties of the cermet was investigated. Results revealed the bending strengh of the cermets can be increased by more than 10%, by using the YSZ pre-sintered at suitable condition. Pre-sintering has promoted the reaction between the primary particles in the YSZ granule, and resultantly suppressed the sinterability of YSZ. Pre-sintered YSZ granule was observed to maintain its spherical shape easily in the cermets. Conductivity was also improved, compared to that of conventional Ni/YSZ cermets which is made of raw YSZ. The reason for this phenomena is thought that Ni particles make a distinct conductive network in this new cermet. These cermets also provide adequate porosity.

Key concepts: Cermet, Yttria-stabilized zirconia, Materials science, Sintering, Granule (geology), Porosity, Composite material, Metallurgy

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