Al₂O₃-TiO₂系溶射セラミックスの切削加工に関する研究

抄録

This study has demonstrated the possibility of cutting four types of plasma sprayed ceramics on an Al₂O₃-TiO₂ system using sintered diamond tools. This experiment investigates the fundamental cutting mechanism, tool wear and machined surfaces. Presently, sprayed ceramics are difficult situation to finish by way of cutting. Because, these materials are formed with laminated small spray particles, and the structure is highly anisotropy, and include some small pores in the grain boundary. Cracks caused by the cutting are developed along grain boundary. These many small cracks or fractures on the machind surfaces are formed due to the cutting. The progress of cracks due to the cutting depend on the direction of the sprayed deposit structure. Even by use of the diamond tool, the frank wear is stronger for cutting of the sprayed ceramics, but the cutting edge was observed as having no occurrence of cracks. The main factor of tool wear is abrasive wear. The structure the machined surfaces classified into the four categories, which are plastic deformation, cutting, small cracks on the sprayed particle and cracks in the grain boundary.