Effects of metal phases on microstructure and mechanical properties of microwave‐sintered Ti(C, N)‐based cermet tool

Abstract

A kind of Ti(C, N)‐based cermet tool material was prepared by microwave sintering. The influence of metal phases (Ni, Co, and Mo) on densification and mechanical properties was studied by orthogonal test. The results indicated that Co was more significant in improving relative density and fracture toughness than Ni, while Ni and Co had the similar effects on increasing the hardness of Ti(C, N)‐based cermet. Mo can improve fracture toughness but decrease hardness. Ti(C, N)‐based cermet with 6 wt% Ni, 6 wt% Co and 6 wt% Mo (TN6C6M6) had the optimal comprehensive mechanical performances, and its fracture toughness and hardness were better than that of Ti(C, N)‐based cermet prepared by conventional sintering. The increasing of sintering temperature promoted the uniformity of microstructure and significantly improved densification and hardness of the Ti(C, N)‐based cermet. The highest fracture toughness of TN6C6M6 (12.41 ± 0.33 MPa·m1/2) was achieved when sintered at 1600°C. For the microwave‐sintered Ti(C, N)‐based cermet, heat preservation period had little effect on densification. The relative density can reach up to 98.6% even though the heat preservation period was 0 minute.

Performance gradient distribution of (Ti,W)C cermet by skin effects of high‐frequency spark plasma sintering

“…The EDS results in Figure 9 show that the metal phases in the material's surface layer are mostly distributed at the junction between the three grains, whereas the metal phases in the material's bulk are dispersed between the grains. The aggregation of metal phase hinders the diffusion between ceramic particles and reduces the density, and its uniform dispersion will promote the densification of the material 36 . To further verify the distribution trend of the metal bonding phase in cermet materials, EDS element line scanning was performed at increasing distances from the material's surface into bulk (the direction is shown in Figure 10A with the yellow line), and the results are shown in Figure 10.…”

“…The aggregation of metal phase hinders the diffusion between ceramic particles and reduces the density, and its uniform dispersion will promote the densification of the material. 36 To further verify the distribution trend of the metal bonding phase in cermet materials, EDS element line scanning was performed at increasing distances from the material's surface into bulk (the direction is shown in Figure 10A with the yellow line), and the results are shown in Figure 10. With increasing distance from the material's surface layer, the peak magnitudes of the Ni and Co metal phases gradually decreased, the peaks' frequencies relatively increased, whereas Mo exhibited a more stable trend.…”

Effect of high-entropy alloy binder content on the microstructure, mechanical properties and oxidation behavior of Ti(C,N)–TiB₂ cermets

“…26) However, a single fracture mode can result in lower performance; therefore, the appropriate ratio of transgranular and intergranular fractures can enable composite cermets to achieve excellent performance. 20),27), 28) Figure 4 shows that with increasing HEA binder content, transgranular fractures gradually increase, and intergranular fractures gradually decrease. When the HEA binder content is 6 wt.%, more pores result in cracks that easily propagate, generating more intergranular fractures.…”

Densification Behavior and Microstructure Evolution of Mo Manocrystals by Microwave Sintering

“…Recent work found that microwave sintering could achieve alloys with carefully designed microstructure and result in improved mechanical properties. [10][11][12][13] Chhillar et al studied the microwave sintering process of micro sized molybdenum powder, and illustrated that increased density and decreased grain size could be obtained at a lower sintering temperature compared with the conventional sintering. [14] Duan et al further investigated the kinetics mechanism of molybdenum powder during microwave sintering process, and concluded that microwave is beneficial to enhance the atomic diffusion and thus promote the densification process.…”