704 金属/セラミックス系積層複合材料の作製(オーガナイズドセッション : 超成形・超塑性と材料)

概要

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Layered composites of YTZ and a mixed composition of YTZ and metallic Ni have been fabricated by a combination of centrifugal filter pressing (CFP) and rate-controlled sintering (RCS). A composite powder of YTZ and 20 vol%Ni was prepared from the mixed precursor of an organic salt of Ni and YTZ powder. The fine Ni particles (<0.5μm) covered by the YTZ particles are efficient to densification at low temperatures. Three sintered materials were prepared by conventional temperature-controlled sintering (LT), rate-controlled sintering in stacking direction (LRS), and layer direction (LRL). The shrinkage anisotropy induced through rate-controlled sintering results in the enhanced compressive stress inside YTZ layers providing the improved fracture toughness (LRL). However, the enhanced anisotropy provides much tensile stress inside YTZ-Ni layers to reduce the resistivity to crack propagation
社団法人日本機械学会の論文
2000-09-08