Comparison of fracture toughness measuring methods applied on silicon nitride ceramics

E. RUDNAYOVÁ; J. DUSZA; M. KUPKOVÁ

doi:doi:10.1051/jp4:19937196

Numéro		J. Phys. IV France Volume 03, Numéro C7, Novembre 1993 The 3rd European Conference on Advanced Materials and Processes Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés


Page(s)		C7-1273 - C7-1276
DOI		https://doi.org/10.1051/jp4:19937196

The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés

J. Phys. IV France 03 (1993) C7-1273-C7-1276
DOI: 10.1051/jp4:19937196

Comparison of fracture toughness measuring methods applied on silicon nitride ceramics

E. RUDNAYOVÁ, J. DUSZA and M. KUPKOVÁ

Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 043 53 Ko[MATH]ice, Slovakia

Abstract
Different fracture toughness testing methods on unreinforced and with Si₃N₄ whiskers reinforced silicon nitride ceramics were compared. The results revealed that in the reinforced ceramics the K_IC rises with the increasing of the crack size, which indicates a rising R-curve behaviour in this system. Using IF testing method equations given by Niihara and by Shetty proved to have the nearest values to these achieved using SENB in both investigated systems.