Pitting mechanism of cemented carbide tool in the early stage of rock drilling

In Situ Friction-Induced Graphene Originating from Methanol at the Sliding Interface between the WC Self-Mated Tribo-Pair and Its Tribological Performance

“…where ΔT is the flash temperature rise between two contact interfaces, μ is the average friction coefficient, and L is the applied load along the perpendicular direction between contact interfaces and equals to 113 N (for the conversion relationships, see Figure S1); the linear speed of υ equals to 1.1 m/s, a is the contact radius of the real contact region, and K YG8ball is the thermal conductivity of the YG8 ball (75 W/m K). 39 The flash temperature increases between two contact interfaces for 113 N sliding in methanol for 300, 600, 1000, and 1800 s by 939, 651, 561, and 527 K, respectively. The ΔT gradually decreases with increasing sliding time.…”

“…It was reported that the temperature and catalysts are two vital factors for the formation of graphene in a chemical vapor deposition (CVD) system. − Thus, we focus on the flash temperature rise and catalysts during sliding. On the one hand, the flash temperature rise could be calculated as the followed formula: where Δ T is the flash temperature rise between two contact interfaces, μ is the average friction coefficient, and L is the applied load along the perpendicular direction between contact interfaces and equals to 113 N (for the conversion relationships, see Figure S1); the linear speed of υ equals to 1.1 m/s, a is the contact radius of the real contact region, and K YG8ball is the thermal conductivity of the YG8 ball (75 W/m K) . The flash temperature increases between two contact interfaces for 113 N sliding in methanol for 300, 600, 1000, and 1800 s by 939, 651, 561, and 527 K, respectively.…”

Is graphene formed on WC surface under glycerol lubrication? Yes

“…The flush temperature rises as an important factor to moderate this transformation 16,17 . The flash temperature at contact area during friction processes could be estimated by the following equation 18 : where ΔT is the flash temperature friction induced between two contact areas, μ is the friction coefficient, F n is the applied load of 98 N in this study, υ is the sliding velocity and equals to 1.1 m/s, α is the contact radius of the real contact area, and K YG8 ball is thermal conductivities of YG8 ball of 75 W/m K 19 . The flash temperature rise is estimated to be 1,097 K. Besides, the catalysts are treated as another vital factor for controlling the formation of graphene.…”

Influence of Cu‐coated diamond addition on the microstructure and mechanical properties of WC‐based cemented carbides

“…Great efforts have been made to expand the application field of diamond tools 5–8 . Cemented carbides, normally consisting of WC phase and metallic binder phase, are also widely used as grinding and cutting tools because of their high strength and outstanding toughness 9–11 . The composites of diamond‐dispersed cemented carbides (DDCC) are proposed to possess excellent comprehensive mechanical performance and have been attracted a lot of interests in the last decades 12–17 …”

“…[5][6][7][8] Cemented carbides, normally consisting of WC phase and metallic binder phase, are also widely used as grinding and cutting tools because of their high strength and outstanding toughness. [9][10][11] The composites of diamond-dispersed cemented carbides (DDCC) are proposed to possess excellent comprehensive mechanical performance and have been attracted a lot of interests in the last decades. [12][13][14][15][16][17] The addition of diamond to cemented carbides could improve their hardness and also increase the fracture toughness, as a result of the crack deflection effect of the diamond particles.…”