Study On The Volume Effect Of Engineering Ceramic Materials In Ultrasonic Vibration

Nano-ceramic is a type of fine ceramics, which not only has the characters of high strength, high hardness, heat resistance, corrosion resistance, wear resistance and so on as traditional ceramics. And it also has special physical and mechanics characters, Such as surface effect, size effect, volume effect, high toughness, super plastic, etc. These properties of nano-ceramic greatly expanded its using field.In order to deeply understanding the inner mechanism and influence factors of nano-composite ceramic's volume effect. In this paper, ZTA nano-composite ceramic is study object. The compared experiment is established based on phase transition and fracture theory. The volume effect of nano-ceramic could be studied by samples'volume fraction. Determinants and impact laws of nano-composite ceramic's high toughness and super plastic could be revealed through macro mechanics,micro cracks and phase structure. The surface roughness and microstructure of nano-composite ceramic could be comparative studied between ultrasonic assisted and common grinding conditions, and analyzed the inner mechanism. The main studies in this article were listed as follow:1,The ZTA ceramic samples'bending strength, fracture toughness, elastic modulus and tensile strength could be tested as composited different volume fraction of ZrO2 and analysis the testing data. The results show that: With the reinforcement phase volume fraction increasing, the sample's mechanical properties increasing. It reaches its maximum value when the volume fraction is about 30%. And then mechanical properties would weaken with volume fraction continuously increasing.2,Compared fracture toughness, tensile strength and micro fracture surface of ZTA nano-composite ceramics could be observed between ultrasonic assisted and common conditions. Experiment shows that ceramic sample has higher crack resistance ability under ultrasonic assisted and the tensile fracture resistance ability also increased significantly. Micro surface of the sample which is under ultrasonic assisted grinding shows that: Materials would be removed by a model of plastic and ductile under ultrasonic. Under the same grinding parameters, better surface quality could be obtained under ultrasonic assisted grinding. Surface roughness value is stable and grinding traces is shallow and well-distributed.