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Superhard Diamond & CBN Resin Wheels |
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Diamond and Cubic boron nitride (CBN) are defined as superabrasive materials because
of their extremely high hardness, abrasion resistance and other unique properties
surpass the traditional abrasives and cutting tool materials such as aluminium oxide(AL2
O3 ), silicon carbide(SiC), tungsten carbide (WC), and high speed steel (HSS). Thus,
diamond and CBN find their extensive use in a wide variety of abrasives and cutting
applications ranging from rough cutting stone to ultra-precision grinding electronic
ceramic.
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This picture shows the hardness of abrasive materials used in grinding operation
along with a few work materials in Knoop unit. Aluminium oxide and silicon carbide
are about one – half the hardness of CBN and about one-third the hardness of diamond. |
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The hardness values of abrasive materials are typical and do not represent the full
range of hardness obtainable for each material. For example, natural diamond hardness
values can reach as high as 11,000 Knoop hardness (HK). |