3M Technical Ceramics
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3M™ Boron Nitride Powder (previously BORONID® boron nitride powder from ESK) has a proven track record over years as a precursor for the production of cubic boron nitride (cBN), which has been commercially available since the end of the 1960s. It is produced from the hexagonal modification at a high pressure of over 6000 MPa and temperatures of over 1500 °C. The transformation takes place by the same mechanisms used for synthesis of industrial diamonds from graphite. Cubic boron nitride with a hardness of 4700 MPa, is currently the second hardest substance known, after diamond.

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Properties

In many grinding applications, cubic boron nitride is even preferable to diamond, since it is stable in air up to temperatures of 1400 °C. Diamond, by comparison, begins to decompose at about 800 °C. Another, very important property of cBN is its chemical resistance to ferrous materials. As a result, cubic boron nitride has become established particularly in the market for rough and fine machining of tool steel and a wide range of nickel and cobalt-based superalloys.

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