Study On The Database For Designing Low Defect Ceramic Cutting Tool Materials

The defects of ceramic cutting tools can deteriorate their mechanical properties. Therefore, many scholars attempt to reduce the defects of ceramic cutting tools materials. The traditional development method of ceramic cutting tool materials system is "trial and error method", this method need a lot of experiments. In this paper, with the aim of reducing defects and improving the mechanical properties, several mechanical properties models of ceramic cutting tool materials were established and a database for designing low defect ceramic cutting tool materials system was developed. Thus the research achievements will provide a new way for designing new ceramic cutting tool materials system.The causes of ceramic tool material defects and the influence of defects on the mechanical properties of the materials were analyzed and the empirical equations of the mechanical properties based on the particle size of ceramic cutting tool materials was established, the results showed that the flexural strength decreases and the fracture toughness increases with an increase in the material particle size. The influence of the pore shape and distribution on the mechanical properties of ceramic cutting tools were studied, a flexural strength model of the ceramic cutting tool based on pore diameter, shape and location was established. Considering the influence of the physical match, particle size and porosity on the mechanical properties of the ceramic cutting tool, and the flexural strength model and fracture toughness model of the low defect ceramic cutting tool were established.The mechanical properties models of four types of alumina based ceramic tool materials, a type of silicon nitride based ceramic tool materials and two types of titanium boride based ceramic tool materials were established. The thinking method for establishing the mechanical property model of ATN (Al2O3-TiN) material system was proposed. The contribution amount models of the material size to the flexural strength and the fracture toughness, and the reduction amount models of the material porosity defects to the flexural strength were established respectively. The flexural strength and fracture toughness model of the ATN material were established allowing for the integrated effects of particle size and porosity. The correctness and universality of the models were verified. The flexural strength model and fracture toughness model of the Si3N4-TiN material system and TiB2-Al2O3material system were established and verified respectively.The overall database architecture of low defect ceramic cutting tool was designed. The demand analysis, the conceptual design and logical design of the database were completed. The B/S mode is utilized in development of the low defect ceramic cutting tool database. The database for designing low defect ceramic cutting tool materials was developed, the information query and computer-aided design of the ceramic cutting materials can be realized using the database.