Abstract

In this study, mechanical characteristics test of Functionally Gradient Materia (FGM) was performed by means of Modified Small Punch (MSP) Test with FGM; NiCrAlY-8YSZ and PSZ-Ni. To determine fracture mechanic factor, it was carried out MSP test that has possibility with small specimen (10*10*0.5 mm$^{t}$ ) and AE test to analyze micro fracture mechanism. As a result, fracture behavior became varied from brittle fracture to ductile as the content of Ni(or NiCrAlY) composition was increased and fracture energy was increased too. AE characteristics demonstrated that AE technique can detect the onset of fracture processes and AE energy was suddenly increased in the vicinity of maximum load. Since Young's modulus, fracture stress and fracture toughness was determined by MSP test, it can be known that the composition of NiCrAly 75%/8YSZ25% has the best mechanical property and furthermore this result is supported with fracture surface observation.

Keywords

• Functionally Gradient Material;
• Modified Small Punch Test;
• Acoustic Emission;
• Fracture Toughness;
• Plasma Spray;
• Partially Stabilized Zirconia

• 경사기능재료;
• 개량형소형펀치시험;
• 음향방출;
• 파괴인성;
• 플라즈마 용사;
• 부분안정화 지르코니아;