Ni-YSZサーメットの酸化還元挙動とその酸素ガス遮断特性

概要

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The influences of redox treatments on the mechanical and gas permeable properties of Ni-yttria stabilized zirconia (YSZ) cermets were investigated. The bending strength decreased successively with the continuous redox treatments. The porosity and the mean pore diameter increased by the first reduction, decreased to be close to the initial levels by the subsequent oxidation, and then again increased by the second reduction. With the oxidation treatment, the surface region of the cermet disk restored the tight microstructure consisting of well-packed grains, while the inside remained porous. This preferential oxidation in the surface region resulted in the negligibly small permeation of nitrogen gas, indicating a possibility of utilizing the cermets a shielding membrane against oxygen permeation. The oxygen gas shielding was experimentally confirmed to occur at around 500℃.
社団法人日本セラミックス協会の論文
1997-06-01