Cubic boron nitride monocrystal (CBN), an artificially synthesized superhard material absent in nature, forms through sp³ hybridization between boron and nitrogen atoms. Its atomic structure resembles that of carbon atoms in diamond, exhibiting high density and exceptional hardness. With a Mohs hardness of 9.7, CBN ranks as the second hardest known material after diamond (hardness 10).
CBN crystals are categorized by color into various systems, including common yellow variants (amber, honey, tan-brown), brown, and black (B-doped) types. Current industrial synthesis primarily employs the static high-pressure catalyst method, utilizing hexagonal boron nitride (hBN) and specific catalysts as raw materials under extreme conditions (1,400-1,800°C, 4-8GPa) to produce CBN monocrystals.
Zhengzhou Berlt's black DL8500 series CBN monocrystals utilize premium-grade hBN with complete crystal structure and minimal impurities. Through optimized synthesis protocols developed over years of research, the process employs highly active lithium-based multicomponent composite catalysts. Precise temperature control with uniform chamber heat distribution ensures controlled nucleation, followed by high-pressure phase transformation from hexagonal to cubic structure and crystal growth. The resulting black CBN crystals exhibit distinct edges, multiple crystal faces, and exceptional impact resistance.
The DL8500 series demonstrates industry-leading impact strength and thermal stability. Its multifaceted crystals with sharp edges are subdivided into Type A and B:
Type A: Complete regular block morphology with enhanced cutting/grinding efficiency and superior strength
Type B: Irregular block/flake morphology offering exceptional sharpness and self-sharpening properties
Applications:
1、Abrasive Tools: DL8500 CBN can be bonded using various matrices (metal, resin, electroplated, ceramic) to form shaped abrasive products. It also serves in polycrystalline composites, grinding particles, and polishing compounds.
2、Cutting Tools: Micron-grade CBN powder is sintered under high temperature/pressure to produce polycrystalline cubic boron nitride (PCBN), finding extensive applications in metal processing industries.
