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SERVICE SUPPORT
07
2025
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03
What is the difference between PCD and CBN inserts?
In the field of modern precision machining, although PCD (polycrystalline diamond) and CBN (polycrystalline cubic boron nitride) inserts are both superhard material tools, they have significant differences in material properties and application scenarios.
PCD inserts are made of diamond powder and binder sintered together, with a hardness of up to HV8000-10000, a thermal conductivity of 700W/mK (about 9 times that of cemented carbide), and a friction coefficient of only 0.1-0.3. CBN inserts are mainly made of cubic boron nitride, with a hardness of HV3000-5000 and a thermal stability of 1400-1500℃. At 800℃, they still maintain cutting performance close to the hardness of ceramics at room temperature, and have no chemical reaction with iron metals below 1200℃.
PCD inserts are specially used for high-speed precision machining of non-ferrous metals (aluminum, copper), non-metals (graphite, carbon fiber, ceramics) and cemented carbides. For example, in the processing of automobile aluminum alloy cylinders, PCD inserts can achieve a mirror effect of Ra≤0.2μm, and the processing efficiency is more than 5 times that of carbide tools. CBN inserts focus on high-hardness ferrous metals, such as hardened steel (HRC45-80), cast iron and high-temperature alloys.
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