Method for producing a sintered composite body
The present invention relates to a method of producing a sintered composite body comprising cubic boron nitride particles dispersed in a cemented carbide matrix by sintering a mixture comprising cubic boron nitride particles and a cemented carbide powder at a sintering temperature below 1350° C. without applying a pressure.
1. A method of producing a sintered composite body of cubic boron nitride particles dispersed in a cemented carbide matrix comprising the step of sintering a mixture of cubic boron nitride particles and a cemented carbide powder at a sintering temperature below 1350° C. without applying a pressure.
2. A method according to claim 1 , wherein the pressure is less than 200 mbar.
3. A method according to claim 1 , wherein the temperature is 1340° C. or below.
4. A method according to claim 1 , wherein the sintering temperature is above 1200° C.
5. A method according to claim 1 , wherein a sintering time is between 20 and 120 minutes.
6. A method according to claim 1 , wherein the sintering is performed in a vacuum sintering furnace.
7. A method according to claim 1 , wherein the mixture comprises an amount of cubic boron nitride particles of 4 weight-% or less.
8. A method according claim 1 , wherein the cemented carbide powder comprises an amount of binder phase of between 6 and 16 weight-%.
9. A method according to claim 1 , wherein the cemented carbide powder comprises tungsten carbide and cobalt.