Abstract Cutting tools according to the invention are provided with a wear-resistant coating of heat-resistant compounds of high-melting metals. A layer of a pure metal is provided between the base material and the coating. The base material is a ceramic or an aluminum oxide-based metal-ceramic material. The intermediate layer is discontinuous. Such tools are manufactured by using condensation of plasma material and ion bombardment in order to successively deposit an intermediate layer of a pure metal and a coating of heat-resistant compounds of high-melting metals on the surface of the base material. The intermediate layer is deposited at a temperature of 1/2T S >T>1/3T S , where T S is the melting temperature of the metal being deposited and T is the temperature of the tool in ° K. The condensation rate and the duration of deposition are selected bearing in mind that metal is to be deposited only on defects found on the surface of the base material.
Cutting tools comprising: a base material which is a ceramic material or an aluminum oxide-based metal-ceramic material; a discontinuous intermediate layer of a pure material on said base material; and a wear-resistant coating of heat-resistant compounds of high-melting metals on said intermediate layer.
Claim 2
Dependent Claim
43 words
Cutting tools comprising: a base material which is a ceramic material or an aluminum oxide-based metal-ceramic material; a discontinuous intermediate layer of a pure material on said base material; and a wear-resistant coating of heat-resistant compounds of high-melting metals on said intermediate layer.
Claim 3
Dependent Claim
128 words
A method for manufacturing cutting tools of the type as claimed in claim 1, comprising the steps of using condensation of plasma matter and ion bombardment in order to deposit an intermediate layer of a pure metal on the base material whose temperature is 1/2T S >T>1/3T S , where T S is the melting temperature of the metal being deposited and T is the temperature of said base material in °K. The condensation rate and the duration of deposition being selected bearing in mind that metal is to be deposited only on defects found on the surface of said base material; and using condensation of plasma matter and ion bombardment in order to deposit a wear-resistant coating of heat-resistant compounds of high-melting metals on said intermediate layer.
Claim 4
Dependent Claim
33 words
A method for manufacturing cutting tools as claimed in claim 2, characterized in that at a condensation rate of 10 to 20 Å/sec, said intermediate layer is deposited during 10 to 15 seconds.