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The difference between cubic boron nitride and hexagonal boron nitride
Boron nitride, with the chemical formula BN, is a crystalline material composed of nitrogen and boron atoms. It exists in four distinct polymorphic forms: hexagonal boron nitride (H‑BN), rhombohedral boron nitride (R‑BN), cubic boron nitride (C‑BN), and wurtzite boron nitride. This article focuses on hexagonal boron nitride and cubic boron nitride, examining their properties and contrasting their differences.
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Introduction to the Materials and Applications of CBN Cutting Tools
In recent years, whenever turning is used to replace grinding or milling to replace grinding, CBN tools are invariably the first choice. This is because CBN micro‑powder boasts a hardness of 8,000–9,000 HV and excellent thermal stability up to 1,400–1,500°C; at 800°C, its hardness even exceeds the room‑temperature hardness of ceramics and cemented carbides. Consequently, it enables cutting operations at speeds 3–5 times higher than those achievable with conventional cemented carbide tools.
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Shape Classification and Selection of Cubic Boron Nitride Cutting Tools
Cubic boron nitride (CBN) inserts are also a type of CBN cutting tool and rank among the primary tools for turning difficult-to-machine materials. Depending on the specific machining operations required for different workpieces, CBN inserts are designed in various shapes and categorized accordingly. In this article, we’ll discuss the classification and selection of CBN insert geometries.
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