발간논문

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A mathematical model for the precipitation of spherical particles of hydronium jarosite from ferric sulfate solution has been developed for the growth stage of particles where no further nucleation is accounted for. Measurements on rate of precipitation of jarosite at elevated temperature was found to be in good agreement with the proposed model. It is apparent that the rate of hydrolysis was increased as the number of nuclei increased and the vague of K/D decreased especially, the particle size was largely affected by the reaction temperature.

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Studies have been conducted to clarify the joining phenomena of ZrO₂ to Ni-Cr steel produced by solid-state diffusion bonding with Al interlayer. The reaction layer at the steel/Al interface was observed clearly. By the EDX analysis, it was confirmed that this layer was a diffusion layer of Al and Fe. Reaction layer of the Al/ZrO₂ interface could not be detected in spite of good contact suggesting that the Al/ZrO₂ interface was bonded by a surface reaction in which a layer of less than 1㎛ in thickness was formed. It is concluded that the optimum conditions for bonding of ZrO₂ to Ni-Cr steel are of the Al interlayer of 0.6㎜, applied pressure of 100 MPa, temperature of 635℃, and time of 120 minutes. The interface shear strength of 50 MPa is obtained under these conditions.

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