Effect of grinding on subsurface modifications of pre-sintered zirconia under different cooling and lubrication conditions

摘要

Pre-sintered zirconia is preferred as a restoration material in dental applications due to its excellent strength ant fracture toughness. When abrasive processes were used to obtain the required shape of (Y-TZP) yttria-stabilizes tetragonal pre-sintered zirconia, it resulted in material strength degradation in the presence of coolant Therefore, experiments were carried out on pre-sintered zirconia with diamond grinding wheel to evaluate the performance of cooling conditions such as dry, wet and minimum quantity lubrication (MQL). The effects a different environments on the grinding performance were studied based on the temperature distribution, phase, transformation, flexural strength, microhardness and edge chipping damage. The Raman spectroscopy and X-ray: diffraction analysis were used to estimate the quantity of monoclinic phase in pre-sintered zirconia. The temperature rise of the workpiece material during the grinding experiment was not higher and insufficient to cans, the thermal stresses. The microstructural changes induced by grinding under different cooling strategies wee associated with the quantitative assessment of monoclinic phase. The flexural strength of ground component was improved in the dry condition compared to the other process due to the absence of the defective layer ant the occurrence of Y3+ ions segregation. After grinding, there was a slight decrease in the hardness value 13; (1-8 HV), which was due to the formation of microcracks in the subsurface layer of the ground surface. addition, to ensure the presence of microcracks, the edge chipping depth was measured. The damage depth obtained from the wet condition showed a higher value of 30 m compared to the dry and MQL conditions.