Methods of preparing cemented carbide inserts for earth-boring bits

摘要

The invention relates to methods of preparing cutting inserts for earth-boring bits. In one embodiment the method comprises partially filling a mould with a first cemented hard particle powder, filling at least a portion of the remaining portion of the mould with a second cemented hard particle powder, consolidating the first and second cemented hard particle powders into a single green compact and sintering the single green compact. In a further embodiment the method comprises consolidating a first cemented carbide powder in a mould to provide a first green compact, placing the first green compact in a second mould, wherein the first green compact fills a portion of the second mould, filling at least a portion of a remaining portion of the second mould with a second cemented carbide powder, consolidating the second cemented carbide powder and the first green compact together to form a second green compact and sintering the second green compact.