VC- and Cr3C2-doped WC–NbC–Co hardmetals

Effects of LaB6 addition on the microstructure and mechanical properties of ultrafine grained WC–10Co alloys

“…It has been shown that the addition of small amount of the LaB 6 (less than 1 mass%) can inhibit the continuous and discontinuous growth of WC particles. The addition of LaB 6 can increase the relative densities, micro-hardness and fracture toughness of alloys. However, adding excess LaB 6 can lead to the decrease in micro-hardness and toughness of alloys.…”

“…WC-Co alloys are processed from WC and Co powders by liquid phase sintering process, during which the WC grain growth can occur [3]. Such a microstructure evolution during sintering is detrimental to the mechanical properties and can be controlled by the addition of some transition metal carbides such as VC, Cr 3 C 2 , NbC, TaC and their mixtures [4][5][6]. Although commercial processes are now available to produce sintered WC-Co with ultrafine grained size, controlling grain growth during sintering still remains a critical technique challenge.…”

The effect of 3mol% Y2O3 stabilized ZrO2 produced by a steric entrapment method on the mechanical and sintering properties of Cr3C2 based cermets

“…The fabrication of Cr 3 C 2 based cermets in bulk form is of great interest to researchers due to the lower sintering temperatures that decreases the overall cost. They also have lower theoretical densities as compared to WC-Co cermets [16,17].…”

Effect of Carbon Content on the Microstructure and Mechanical Properties of NbC-Ni Based Cermets

“…Despite the promising properties of NbC, the potential of NbC as a major component in hard materials for wear applications was only recently reported by Woydt et al [9,10] and for machining by Uhlmann et al [11]. A remarkable NbC grain growth was observed in Co and Ni bonded NbC cermets after liquid phase sintering [12,13]. The NbC grains formed an interconnected network and a combined trans/inter-granular fracture mode was detected on fracture surfaces.…”