3C 2-nano-TiB 2 cermets fabricated by spark plasma sintering]]>

摘要

AbstractThis paper reports the effect of tungsten carbide (WC) and cobalt (Co) addition on the microstructural and mechanical properties of titanium carbonitride (TiCN) cermets modified by Cr3C2and nano-TiB2addition, processed by spark plasma sintering (SPS). The addition of the WC and Co was varied from 0 to 15wt%. The microstructure, hardness and fracture toughness of the developed cermets were studied. The hardness and fracture toughness of the cermets increased to 52% and 33%, respectively with WC additions. With Co additions the hardness decreased by 13%, but the fracture toughness increased by 9%. The cermet with 60%TiCN-15%WC-15%Co-5%Cr2C3-5% nano-TiB2composition has shown balanced improvement in hardness (19.1GPa) and toughness (8.4MPa·m1/2). The machining performed by this cermet, developed minimum cutting force and surface roughness on the machined surface of the EN24 workpiece material.Highlights?During spark plasma sintering, the effect of tungsten carbide (WC) and cobalt (Co) on the microstructural and mechanical properties of Cr3C2and nano-TiB2modified titanium carbonitride (TiCN) cermets were studied.?Two different types of core-rim structures were found: 1. Black core and Grey rim 2. White core and grey rim.?The hardness of the cermets increased up to a maximum of 52% in case of 15wt.% WC addition and the fracture toughness increased up to a maximum of 33% in case of 5wt.% WC addition. The hardness decreased to a minimum of 13% in case of cermet with 5wt. %Co addition but the fracture toughness increased by 9% in case of 15wt.% WC addition.?The cermet with 60%TiCN-15%WC-15%Co-5%Cr3C2-5% nano-TiB2(wt.%) composition shows balanced improvement in hardness (19.1GPa) and toughness (8.4MPa·m1/2). Cutting force (19N) and surface roughness (1.4μm) was a minimum for the composition studied.]]>