Influence of ultrasound on the physico-mechanical and cutting properties of metal/diamond compositions for machining high-strength ceramics

摘要

The hard nonmetallic construction materials (the sitalls, the composites of the "carbon/carbon" type, the ceramics based on the carbides and the nitrides, and soon) are difficult to machine. To intensify the processes of the cutting of these materials, we use diamond tools that are vibrated ultrasonically at small amplitudes [1]. But in the ultrasonic machining of the ceramic parts that are based on silicon carbide and nitride the diamond tools using the metallic binders of the type M2-01(M1), fabricated by the powder metallurgy method, are ineffective because of their low strength. Ultrasound is also used to increase the strength of the tools [2], however its influence on the properties of the two-phase metal/diamond compositions that are used in the cutting tools has not been adequately studied. The studies that have been performed in recent years at MAI [Moscow Aviation Institute] fill in this void to some extent. In- the process of the studies we have obtained data on the change of the physical/mechanical and thermophysical properties of the "metallic-binder/diamond" compositions (the elastic modulus E{sub}K, the ultimate compressive strength σ{sub}C， the Brinell hardness HB, the specific heat C, the thermal conductivity λ, and the thermal diffusivity α) under the action of ultrasound.