EDM cuttable, high cBN content solid PCBN compact
AssigneeElement Six Limited
InventorsYahua Bao, Scott Horman, Xian Yao, Qingyuan Liu
Life of this patent
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Abstract
The present disclosure relates to cubic boron nitride (cBN) cutting elements that have high cBN content and that are cuttable by electric discharge machining (EDM). A cutting element according to an embodiment includes a self-sintered polycrystalline cubic boron nitride (PCBN) compact, having a first phase of cubic boron nitride (cBN) particles and a ceramic binder phase with titanium compounds. The first phase occupies greater than 80% by volume of the self-sintered PCBN compact. The self-sintered PCBN compact has an electrical conductivity sufficient to be cuttable by electrical discharge machining.
Claims9
A method of forming a self-sintered polycrystalline cubic boron nitride (PCBN) cutting element comprising:
- mixing a plurality of cBN particles with a binder precursor to form a mixture, the mixture comprising over 80% by volume cBN particles;
- HPHT sintering the mixture without substrate support, to form a self-sintered PCBN compact;
- and
- cutting the self-sintered PCBN compact by electrical discharge machining;
- in which the binder precursor comprises one or more of the following:
- Ti3AlC, Ti2AlC, Ti3AlN.
Dependencies are inferred from the claim text.