2735 球圧子押込みによる多孔質セラミックスの破壊強度に及ぼす気孔径の影響(S28-2 セラミックスおよびセラミックス系複合材料(2),S28 セラミックスおよびセラミックス系複合材料)

抄録

Due to its filterability and thermostability, porous ceramics have a large attention as a suitable material for filters such as a diesel particulate filter. Since damages induced by contact stress on filters cause serious degradation of their strength and life span, the standardization of sphere indentation test is necessity to evaluate the indentation strength of porous ceramics quantitatively. The sphere indentation examination was carried out to investigate the effects of pore diameter on indentation strength. Three porous ceramics were tested ; each porous ceramic contains different pore diameter. The result shows that indentation load increased monotonically along with an increase in indentation depth when the porous ceramic has small diameter. However, with a larger diameter, the graph of load-displacement displays load non-monotonically increases with vertical fluctuation. The strength of specimen with larger pore diameter relies on indentation sphere size. While the ceramics strength with smaller pore diameter stays constant, the strength of larger one rises with increasing sphere diameter.