Nickel-cobalt-based materials for diamond cutting tools

Mechanical and tribological performance of Ni–Co-based binders for cubic boron nitride cutting tools

“…13 However, Co high toxicity reduced availability, and price instability 14 has set the tone for the search of alternative binder materials or materials with lower Co content for cutting tools. 15–17 However, these materials need to impart to the tool the necessary mechanical and wear resistance under in-service conditions.…”

“…11,12 There are evidences in previous studies that when using adequate processing, cobalt presents a good compatibility with CBN, guaranteeing that no phase transformation into hexagonal boron nitride (owing lower hardness) occurs, with especial attention needed regarding temperature, that must be kept lower than 1300 C. 13 However, Co high toxicity reduced availability, and price instability 14 has set the tone for the search of alternative binder materials or materials with lower Co content for cutting tools. [15][16][17] However, these materials need to impart to the tool the necessary mechanical and wear resistance under in-service conditions.…”

“…Hot pressing (HP) technique makes use of temperature and pressure simultaneously in order to sinter a metallic matrix free of porosity, usually attaining a high level of densification. [15][16][17][18] HP allows a strict control of the temperatures achieved, a fact that together with an accurate control of the sintering time allows avoiding grain growth, thus enhancing the mechanical properties of the material.…”