Y-TZP/SiC複合体の焼結と機械的性質

概要

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Zirconia powders containing 3mol% Y<SUB>2</SUB>O<SUB>3</SUB> were mixed with SiC powders or SiC whiskers by ball-milling and were uniaxially pressed at 1OMPa prior to cold isostatic pressing at 200MPa. The green bodies were sintered at 1450 and 1500°C for 1-18 hours under a stream of 95vol%He-5vol%CO gas, and then were hot isostatically pressed at 1450°C and 15OMPa for 1 hour in an Ar gas atmosphere. The density of HIPed bodies increased with increasing that of presintered bodies. The presintered bodies of Y-TZP/2.5vol%SiC particle composites with a relative density above 93% could be densified to almost fully theoretical density by HIPing. The bending strength of the Y-TZP/SiC(particle) and Y-TZP/SiC(whisker) composites increased by hot isostatic pressing, while the values of the Weibull modulus did not increase.
社団法人粉体粉末冶金協会の論文