焼結機構が見掛け上変化する一つの理由

概要

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A general sintering equation for a single mechanism is developed with respect to ΔL according to Taylor's expansion method, where ΔL is the shrinkage of a powder compact during sintering. The resulting equations indicate that effective ahrinkage of the green compact, ΔL_i, influences the apparent time dependence, that is, the m-power dependence of ΔL. The n-power dependence of ΔL, defined using a conventional sintering model, appears only in the case where ΔL_i≪ΔL. If ΔL≪ΔL_i, sintering obeys a kinetic equation of m=1 irrespective of the n value, that is, regardless of the sintering mechanism that contributes to densification. The foregoing evaluation well explains the data that slight pre-sintering of a sinterable Al_2O_3 powder compact results in an appreciable decrease of the m value. The presently derived equations can be used to estimate the degree of neck growth in a green compact and thus evaluate the quality of sintering data.
社団法人日本セラミックス協会の論文
1998-05-01