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http://dx.doi.org/10.3740/MRSK.2005.15.12.751

Microstructure and Material Properties of Fibrous Al2O3-(m-ZrO2)/t-ZrO2 Composite Depending on the Volume Fraction of Core/Shell  

Kim Ki-Hyun (School of Advanced materials Engineering, Kongju National University)
Lee Byong-Taek (School of Advanced Materials Engineering, Kongju National University)
Publication Information
Korean Journal of Materials Research / v.15, no.12, 2005 , pp. 751-755 More about this Journal
Abstract
Fibrous $Al_2O_3-(m-ZrO_2)/t-ZrO_2$ composites having core/shell structure were fabricated by multi-extrusion process. The effect o volume fraction between core ($Al_2O_3-(m-ZrO_2)$) and shell ($t-ZrO_2$ was investigated to understand the relationship between microstructure and material properites, in which the volume fractions of core and shell were varied as 40:60, 50:50 and 60:40. The material properties o hardness and bending strength were increased as the volume fraction of core was increased, and their maximum values were about 1320 Hv and 750MPa, respectively. However, as the volume fraction of core increased, the values of relative density and fracture toughness were decreased from 97.1 to $96.5\%$ and from $6.5MPa{\cdot}m^{1/2}$ to $5.7MPa{\cdot}m^{1/2}$, respectively.
Keywords
fibrous microstructure; multi-extrusion process;
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