Cubic Boron Nitride（CBN） is a superhard material whose hardness is second only to diamond and much higher than other materials. Cubic Boron Nitride is widely used in sawing tools, grinding tools, drilling tools and cutting tools. Diamond is easy to be oxidized at high temperature, especially with good affinity with iron-based elements, so it is not suitable for iron-based element ferrous metal processing. Cubic Boron Nitride has good chemical stability, especially compared with diamond, and does not chemically react with iron group elements at temperatures as high as 1100-1300 °C, so it is especially suitable for processing ferrous metal materials.
Cubic Boron Nitride
Introduction
Cubic Boron Nitride（CBN） is a superhard material whose hardness is second only to diamond and much higher than other materials. Cubic Boron Nitride is widely used in sawing tools, grinding tools, drilling tools and cutting tools. Diamond is easy to be oxidized at high temperature, especially with good affinity with iron-based elements, so it is not suitable for iron-based element ferrous metal processing. Cubic Boron Nitride has good chemical stability, especially compared with diamond, and does not chemically react with iron group elements at temperatures as high as 1100-1300 °C, so it is especially suitable for processing ferrous metal materials.
Table 1: Performance comparison of Cubic Boron Nitride and synthetic diamond
Specifications | Cubic Boron Nitride | synthetic iamond |
Molecular formula | BN | C |
Density，1×105kg/m3 | 3.45-3.54 | 3.48-3.54 |
Hardness， HV(10N/mm2) | 8000-9000 | 10000 |
Flexural strength，GPa | 0.294 | 0.21-0.28 |
Thermal conductivity，W/(m·k) | 75.55 | 146.54 |
Thermal stability，℃（Air） | 1250-1350 | 700-800 |
with iron group elements | Chemically inert | Chemically inert (reactive) |
FIG.1 The unit cell of Cubic Boron Nitride.
The crystal forms of Cubic Boron Nitride include tetrahedral frustum, octahedron, distorted crystal and twin crystal.
FIG.2 Cubic Boron Nitride Tool.
The Cubic Boron Nitride tool is made of CBN single crystal with or without any binder. Produced by high pressure sintering. The product has most of the properties of CBN and overcomes the shortcoming of the directional dissociation of the CBN single crystal plane.
FIG.3 Cutters made of Cubic Boron Nitride.
The Cutters made of Cubic Boron Nitride have the characteristics of high hardness, high wear resistance, high chemical inertness, high stability, high thermal conductivity and low friction coefficient.
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