Effect of particle size of Y2O3-Al2O3 additives on microstructure and mechanical properties of Si3N4 ceramic balls for bearing applications
2021
Si3N4 ceramic balls were prepared by gas pressure sintering with Y2O3 and
Al2O3 as sintering additives. The effects of particle size of Y2O3-Al2O3
additives on densification, microstructure and mechanical properties of
Si3N4 ceramic balls were investigated. The reliability of Si3N4 ceramic
balls was evaluated through the Weibull modulus. The results showed that
Si3N4 ceramic balls containing nanosized Y2O3-Al2O3 additives have a higher
relative density and better comprehensivemechanical properties compared with
the samples containing microsized additives, with relative density of 98.9 ±
0.2%TD, Vickers hardness of 14.7 ± 0.1GPa, indentation fracture toughness of
6.5 ± 0.1MPa•m1/2 and crushing strength of 254 ± 8.5MPa. The more
homogeneous and extensive dispersion of the nanosized sintering additives in
the Si3N4 matrix is the main reason for the enhancement in density and
mechanical properties of the Si3N4 ceramic balls.
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