粒子架橋機構によって高靱化されたセラミックスの疲労特性の評価

概要

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Rotary bending fatigue and static fatigue tests were carried out for silicon nitride and silicon carbide ceram ics at roum temperature, with determining the frac ture toughness values by SEVNB and SEPB methods. Two of the silicon nitride ceramics exhibit the great difference between the toughness values obtained from two methods, suggesting that there is a strong traction force in the propagating crack interface. From the observation of crack extension path, mechanisms of grain bridging and crack surface interlocking are con cluded to be responsible for the strong traction. Materi als, having a much greater SEPB toughness than that of SEVNB, exhibited considerable degradation in fa tigue strength due to cyclic loads during rotary bend ing tests . This suggests that the damage in the crack surface causes degradation in fatigue strength. Analy sis, assuming that cyclic loads affect the B curve behav ior, was consistent with the measured rotary bending fatigue behavior.
社団法人日本セラミックス協会の論文
1994-05-01