アルミナ粉体-窒化ケイ素ウイスカー系サスペンションのレオロジー的性質と固化

概要

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Dispersion, rheology and consolidation of the colloidal suspension in the alumna powder-silicon nitride whisker system were studied to control the microstructure and density of the green compact. Al_2O_3 particles with au average diameter of 0.15 μm and Si_3N_4 whiskers with an average size of 0.4 μmX3.7μm were electrostatically dispersed in water in the pH range 3 to 10 and consolidated by filtration. Well- dispersed stable suspensions were obtained at low pH. Decreasing the viscosity and at the same time increasing the solid content of the suspension is the hey step in making the green compact with high density and a narrow pore size distribution. Application of isostatic pressing to compacts consolidated by filtration increased green density and shifted the pore size distribution to smaller size. These green compacts by colloidal processing were densities to relative densities of 98.4-99.4% by hot-pressing at 1500℃ at a pressure of 39 MPa in N_2 atmosphere.
社団法人日本セラミックス協会の論文
1989-09-01