粉体の製造履歴に依存する見掛けの焼結機構

概要

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An effective shrinkage ΔL_i was pointed for a green compact because of necks considerably grown during calcining process. A general sintering equation was developed with respect to ΔL according to Taylor's expansion method, where ΔL is a shrinkage of the powder compact during sintering. The resultant equations indicate that ΔL_i has influence on the apparent time dependence, that is, the 1/m-power dependence of ΔL. If ΔL_i is unknown, the reasonable 1/n-power dependence of modified shrinkage, ΔL_i + ΔL, which is determined by the mechanism of material transport, can be estimated only in the case where ΔL_i<<ΔL_i If ΔL<<ΔL_i, sintering seemingly obeys a kinetic equation of m=1 irrespective of any n value, any sintering mechanism contributing to densification. The foregoing evaluation well explained data that slight pre-sintering results in appreciable decrease of the m value. The fabrication history of a powder has naturally influence on the m value in a manner that it has also influence on the degree of neck growth in hard agglomerates, that is, the ΔL_i value.
社団法人日本セラミックス協会の論文
1988-10-01