Abstract
Microstructure and mechanical properties of HP, HP/GP and HP/HIP-Si3N4 were studied using scanning electron microscopy, bending tests and the indentation fracture method. The distribution of grain diameter was analyzed to clarify the relationship between microstructure and mechanical properties (bending strength and fracture toughness value). It is shown that bending strength increased with decreasing the grain diameter. The results also showed that a Hall-Petch relationship was recognized for grain diameter and fracture stress. The fracture toughness value shows a linear relationship with σF√(βda), and is closely related to aspect ratio of Si3N4 grain. From these grain morphological analysis results, it is concluded that the microstructure composed of Si3N4 grains having both small grain diameter and large aspect ratio is effective to improve both fracture strength and fracture toughness.
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