Fracture toughness value and SEM observations of cracks in almina and zirconium oxide ceramics

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  • HARADA Kosuke
    Department of Crown and Bridge, The Nippon Dental University, School of Life Dentistry at Tokyo
  • SHINYA Akiyoshi
    Department of Crown and Bridge, The Nippon Dental University, School of Life Dentistry at Tokyo

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  • アルミナとジルコニア系セラミックスの破壊靱性値とSEMによる破面解析
  • アルミナ ト ジルコニアケイ セラミックス ノ ハカイジンセイチ ト SEM ニ ヨル ハメン カイセキ

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In this study, a Vickers indenter was pressed into glass-infiltrated alumina, yttria-stabilized zirconia (Y-TZP), and a ceria-stabilized zirconia/alumina nano composite (Ce-TZP/Al2O3 nano composite), using an indentation fracture method (IF method), and the effect on the calculated Vickers hardness, fracture toughness value, and indentation fracture load was examined to deduce the optimum conditions of the IF method for each material. As a result, the optimum indentation fracture load for the IF method was 10 and 20 kgf for glass-infiltrated alumina, and 20 and 30 kgf for Y-TZP. For the Ce-TZP/Al2O3 nano composite, cracks occurred at only 50 kgf; therefore, the only measured value was at 50 kgf. In addition, in the Ce-TZP/Al2O3 nano composite, a characteristic interpenetrated intragranular nano composite structure was observed, and its cracks led to an intergranular fracture, in which the cracks develop in the composite structure of zirconia and alumina particles in a zigzag manner.

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