Cubic boron nitride is a synthetic crystalline material with a hardness second only to diamond. Its structure is also similar to diamond, featuring a complex cubic/zinc blende structure. It consists of a face-centered cubic lattice formed by boron atoms and another face-centered cubic lattice formed by nitrogen atoms, offset diagonally by 1/4. Cubic boron nitride abrasive particles are composed of short covalent boron-nitrogen bonds forming an extremely precise three-dimensional structure. These structures are inherently wear-resistant, corrosion-resistant, and highly stable, making CBN abrasives exceptionally suitable for grinding applications.
Although CBN abrasives are slightly less hard than diamond, they possess higher inertia and excellent thermal stability under high-intensity working conditions.
The wear resistance and hardness of CBN abrasives are more than four times that of traditional abrasives, offering extremely high wear resistance. Its unique chemical properties also make it particularly suitable for grinding ferrous metals.
When grinding ferrous metals, no reaction occurs between them. Likewise, it is not easily oxidized when grinding steel alloys. This makes CBN abrasive the preferred material for high-performance grinding wheels, used for grinding various materials such as cast iron and hard steel.
High hardness and good red hardness. Cubic boron nitride abrasives rank second in hardness, only to diamond, maintaining their hardness even at high temperatures of 1200 degrees.
High chemical inertia and good stability. Cubic boron nitride has a low affinity for elements like carbon and iron, making it very suitable for high-speed grinding of ferrous metal materials. It is particularly effective for grinding tool steel, bearing steel, alloy steel, and alloy cast iron, with very high efficiency and minimal wear.
CBN abrasives especially CBN abrasive micron powder have excellent thermal conductivity, with a thermal conductivity 45 times that of corundum, allowing rapid dissipation of grinding heat. It can withstand temperatures of 1300-1500 degrees, making it suitable for grinding high-speed steel and high-strength alloy steel, which are sensitive to high temperatures.
Workpieces ground with cubic boron nitride grinding wheels exhibit high surface quality, less likely to develop grinding burns, cracks, or other defects, enhancing fatigue strength and extending service life by 30% to 50%.
CBN abrasive wheels are suitable for high-speed or ultra-high-speed grinding, with grinding efficiency 150-200 times that of ordinary grinding wheels.
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