Boron Nitride in Superhard Cutting Tools: Cutting Edge Solutions Beyond Conventional Cemented Carbide

Hexagonal boron nitride (h-BN) has important applications in the field of superhard cutting tools due to its unique properties, especially in machining scenarios where high temperatures, high wear resistance and chemical stability are required. The following are its key applications and characteristics:

High hardness and wear resistance: h-BN's hardness is second only to diamond, but superior to traditional cemented carbide and ceramic materials, making it suitable for machining high hardness materials (e.g., hardened steel, high-speed steel).

High temperature stability: h-BN remains chemically stable above 1200°C (diamond oxidizes at 800°C), making it suitable for high speed cutting and dry machining.

Reduced coefficient of friction: h - BN has good lubricating properties. Coating h - BN on the tool surface significantly reduces the coefficient of friction between the tool and the workpiece. This reduces the cutting forces and the generation of cutting heat, for example during cutting operations, and contributes to the improvement of the machined surface quality, as well as to the reduction of tool wear and the extension of tool service life.

Improvement of tool wear resistance: h - BN coating can improve the hardness and wear resistance of the tool surface. It can withstand certain cutting pressure and friction, forming a protective barrier at the cutting edge of the tool and reducing the direct wear of the tool material. Especially for machining high hardness materials or high speed cutting, it can effectively improve the wear resistance of the tool and maintain the sharpness of the tool, thus improving machining accuracy and efficiency.

Enhanced chemical stability: h - BN has high chemical stability, and ferrous metals (such as steel, nickel) almost no reaction, to avoid diffusion wear between the tool and the workpiece material, and diamond processing of ferrous materials are prone to carbonization reaction.

When machining some corrosive materials, h - BN coatings can protect the tool substrate, prevent the chemical reaction between the tool and the workpiece material, avoid chipping, spalling and other forms of failure of the tool, and improve the reliability and service life of the tool in complex machining environments.

As an additive to the tool material

Improvement of tool material performance: adding h-BN to tool materials, such as carbide, high-speed steel, etc., can improve the performance of the tool material. h-BN can refine the grain, so that the organization of the tool material is more homogeneous, so as to improve the comprehensive performance of the material, such as strength, toughness and hardness. For example, adding the right amount of h - BN in the cemented carbide tool can improve the toughness of the cemented carbide, so that it is not easy to brittle fracture in the cutting process, while also maintaining high hardness and wear resistance.

Improve the heat resistance of cutting tools: h - BN has high heat resistance, added to the cutting tool material can improve the heat resistance of cutting tools. In high temperature machining conditions such as high speed cutting or dry cutting, the tool can withstand higher temperatures, reduce the softening and wear of the tool material due to high temperatures, maintain good cutting performance, and improve machining efficiency and quality. In addition, in the process of preparing superhard tools, h - BN can also be used as an auxiliary material to improve the tool preparation process. For example, in the sintering process of the tool, h - BN can be used as a sintering additive to promote the densification of the tool material and improve the density and performance of the tool.

Shengyang New Material Co., Ltd. is committed to the production of boron nitride and boron nitride processed products, and can customize various boron nitride insulating ceramic parts according to customer needs. Contact us if necessary.
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