Determination of the fracture mechanical parameters of porous ceramics from microstructure parameters measured by quantitative image analysis

摘要

The porosity that takes an important part in failureprocess of three different ceramic materials (mullite, siliconcarbide and silicon nitride )was characterised by means ofQuantitative Image Analysis (QIA). Several parameters such assize, shape and orientation of pores have been evaluated. In parallel.the mechanical properties such as fracture toughness and Weibullmodulus were directly measured. In order to appreciate therelevance of the use of QIA, the mechanical parameters have alsobeen deduced from the microstructural features, and a comparisonbetween measured and determied values was carried out. Theresults show a remarkable concordance.