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AssigneeHilti Aktiengesellschaft
InventorsWalter Ritt, Johann Dorfmeister, Wolfgang Tillmann, Martin Goedickemeir
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An abrasive cutter formed of at least one diamond particle, preferably at least one mono-diamond crystal and metallic binder material distinguished by the fact that the diamond particle (D) has a size of about 50 μm to about 500 μm and each diamond particle (D) is enclosed by a coating (H) produced in a fluidized bed with the coating having a wall thickness of about 10 μm to about 200 μm. The volume of the coating (H) constitutes at least 30% of the volume of the diamond particles (D) in the fully consolidated state following individual sintering of the coated diamond particles (D, H). The abrasive cutters can be applied directly onto an abrasive tool. Further they can be processed to form composite cutters or cutting segments. In the method of forming the abrasive cutter, the diamond particle (D) is brought into a fluidized bed reactor and enclosed in a metallic coating (H). Coated diamond particle (D, H) can be processed into larger cutters or segments in each case individually sintered and fixed directly on an abrasive tool.
An abrasive cutter comprising at least one diamond particle and metallic binder material wherein said diamond particle (D) has a size in the range of about 50 μm to about 500 μm and having a volume, a coating (H) of said metallic binder material is applied in a fluidized bed process and completely encloses said diamond particle, said coating (H) having a thickness (t) in a range of 10 μm to about 200 μm, said diamond particle and coating being individually sintered and after the sintering the coating (H) having a volume of at least 30% of the volume of said diamond particle.
A method of forming an abrasive cutter made of at least one diamond particle and a metallic binder material comprising steps of introducing diamond particles having a size in the range of about 50 μm to about 500 μm into a fluidized bed reactor and maintaining said diamond particles swirling in suspension by a fluidized gas, spraying a suspension of the metallic binder material onto said diamond particles in suspension and coating each diamond particle for a thickness (t) in the range of about 10 μm to about 200 μm and sintering each coated diamond particle so that the coating has a volume of at least 30% of the volume of the diamond particle in the final sintered state.
Dependencies are inferred from the claim text.