Additive manufacturing method for cemented carbides

Abstract

An additive manufacturing (AM) method for cemented carbides includes the specific steps: Preparing a uniformly dispersed cemented carbide powder by ball milling; preparing a printing feedstock by internal mixing; preparing a printed green body by material extrusion using the feedstock; and subjecting the printed green body to debinding-vacuum pressure sintering to obtain a cemented carbide product. A cemented carbide product prepared by combining green body printing with two-step solvent debinding, thermal debinding and vacuum pressure sintering has free of pores, cracks and harmful phases such as decarburization, carbon defects and brittle phases, simple phase composition, high relative density and excellent comprehensive mechanical properties. The method effectively solves the difficult problems of cracking, pores, decarburization, brittle phases, deformation, low relative density, poor comprehensive mechanical properties and the like which make troubles in AM of cemented carbide for a long time and are difficult to solve by a present AM process.

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