積層型Al_2O_3セラミックスの作製及びその機械的性質

概要

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Lamellar Al_2O_3 ceramics were fabricated by the slip casting method, using two types of Al_2O_3 powders having different particle sizes and densification behavior between each other. The lamellar ceramics have the structure of alternating dense and porous layers with respective thickness, λ_p and λ_p, ranging from 60 to 500 μm, and the volume fraction of the dense layers. V_D, from O to 100%. The lamellar structures were controlled by changing the casting time and using the centrifugal force for draining the Al_2O_3 slurries during green forming. Fracture strengths of the lamellar ceramics were measured by three-point bending. Some of the lamellar ceramics showed higher flexural strength than monolithic, dense Al_2O_3 (〜335 MPa) . The maximum strength, 〜400 MPa, was obtained for the lamellar ceramic with V_D=89±3%, λ_p=500 μm, λ_p= 60 μm. The high strength is discussed from the view point of the crack deflection in the porous layers,
社団法人日本セラミックス協会の論文
1988-12-01