Patent ID: 7700195

Claim:
An ultrasonic operated cutting tool comprising: a basic body presenting an active end portion having a surface with a diamond film obtained by CVD growth technique, said basic body comprising superficial accidents that are arranged and dimensioned to produce a substantial increase of the seating area for the diamond film and an increased degree of mechanical interference with the latter, and a coating layer formed between the basic body and the diamond film, the coating layer comprising a modified layer that comprises a surface of said active end portion and a layer immediately under said surface of the active end portion and presenting, externally, the superficial accidents, said modified layer being an ionic modified layer presenting at least one of the ions defined by nitrogen, carbon and hydrogen, at least one of said ions having a controlled diffusion into the basic body and inhibiting the diffusion of carbon and hydrogen into the basic body, and said basic body being a metallic material having good ultrasound transmission, high ultimate strength to ultrasound, adequacy to diamond film growth and being adapted to preserve said properties after said diamond film growth.