cBN SINTERED COMPACT AND CUTTING TOOL

• Main Authors: TAKEI RYOUTA, OGUCHI SHIRO, MONMA MASASHI, YUMOTO KENJI
• Format: Patent
• Language: Chinese; English
• Published: 15.10.2021
• Subjects: ARTIFICIAL STONE; BORING; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; REFRACTORIES; SLAG; TRANSPORTING; TREATMENT OF NATURAL STONE; TURNING

The objective of the invention is to provide a cBN sintered compact demonstrating high toughness and sufficient resistance to crack propagation in a high-speed interrupted cutting process performed on a difficult-to-machine material such as hardened steel, and a defect-resistant, chipping-resistant cutting tool including the cBN sintered compact as the tool base material. The cBN sintered compact comprises a cubic crystal Ta compound containing C and dispersed in the ceramic binder phase in a proportion of 1.0 to 15.0% by volume, and the mean particle diameter of the cubic crystal Ta compound containing C is 50 to 500 nm. 本发明的目的是提供一种在淬火钢等难切削材料的高速断续切削加工中具有充分的耐裂纹传播性且韧性高的cBN烧结体及将该cBN烧结体作为工具基体的具有耐破损性和耐崩刃性的切削工具，该cBN烧结体的含C立方晶Ta化合物在所述陶瓷结合相中以1.0～15.0体积％的比例分散，所述含C立方晶Ta化合物的平均粒径为50～500nm。