Microstrucures of Metal-Oxide Composites Formed by Solid-State Displacement Reaction

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  • TAIMATSU Hitoshi
    Department of Materials Engineering and Applied Chemistry, Mining College, Akita University
  • SUZUKI Shunichi
    Department of Materials Engineering and Applied Chemistry, Mining College, Akita University
  • KITANO Masamichi
    Department of Materials Engineering and Applied Chemistry, Mining College, Akita University
  • KANEKO Hiroyuki
    Department of Materials Engineering and Applied Chemistry, Mining College, Akita University

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  • 固相置換反応により生成する金属-酸化物微細複合組織
  • コソウ チカン ハンノウ ニ ヨリ セイセイスル キンゾク サンカブツ ビサイ

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Abstract

Several metal-oxide composites have been made by solid-state displacement reactions between powders of metals and oxides, and their structures have been examined metallographically. In the Cu2O-Ni system, in which the sandwich-type reaction couple forms products with a typical layered arrangement, spherical NiO grains scattered in the Cu matrix; the size of oxide spheres was determined by the particle size of the metal powder used. In the NiO-Ti, Cu2O-Fe and Cu2O-Ti systems, in which the sandwich-type reaction couples form products with aggregate arrangements, metal and oxide product phases were finely interwoven; the microstructures were independent of the particle size of the metal powders used. Composition of metal and oxide products was controlled by adding another metal or oxide to the starting powder. Fusion of products by reaction heat is avoided by pre-annealing at low temperatures and adding inert substances as diffusion barriers.

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