Overview
High purity cubic boron nitride (CBN) is a synthetic crystalline material second only to diamond in hardness. Developed in the 1950s as an alternative to diamond for ferrous metal processing, CBN maintains its structural integrity at temperatures exceeding 1200°C. The cubic crystal structure gives it isotropic properties ideal for precision machining applications. Industrial-grade CBN typically contains 99.9% or higher purity, with carefully controlled particle sizes ranging from submicron to 500 microns. Unlike hexagonal boron nitride (h-BN), the cubic phase forms under high pressure and temperature conditions similar to diamond synthesis, requiring specialized production equipment.
Physical and Chemical Properties
CBN's exceptional hardness (Mohs 9.8) combined with high thermal conductivity (1300 W/mK) makes it uniquely suited for high-speed machining operations. The material exhibits remarkable chemical stability, resisting attack by iron, nickel, and cobalt alloys up to 1400°C - a key advantage over diamond tools which react with ferrous metals. Optically, pure CBN crystals are transparent with a wide bandgap (6.4 eV), though industrial grades often appear amber or black due to impurities. Its thermal expansion coefficient (3.5×10⁻⁶/K) closely matches common tool steel, minimizing thermal stress in bonded abrasive applications.
Main Applications
Approximately 70% of industrial CBN consumption goes into metal cutting tools, particularly for machining hardened steels (45-65 HRC) in automotive and aerospace components. As bonded abrasives, CBN grains excel in grinding camshafts, bearing races, and gear teeth where surface finish requirements exceed Ra 0.2 μm. Emerging applications include heat spreaders in high-power electronics and wear-resistant coatings. The semiconductor industry utilizes ultra-pure CBN as a substrate for III-nitride epitaxial growth, leveraging its lattice matching with gallium nitride and superior thermal properties over silicon carbide.
Safety and Storage
While CBN itself is non-toxic, inhalation of fine powders may cause mechanical irritation to respiratory systems. Processing facilities should implement local exhaust ventilation and require NIOSH-approved N95 respirators during powder handling. Bulk storage requires moisture-proof containers with nitrogen purging for premium grades. Fire hazards are minimal as CBN doesn't combust, but high dust concentrations in air may create explosive mixtures. Spills should be cleaned with HEPA-filtered vacuum systems rather than dry sweeping. Unused material should be stored separately from strong oxidizers and metal powders.
B2B Procurement Guide
Industrial buyers should specify three critical parameters: crystalline perfection (verified by XRD), metallic impurity levels (particularly Fe, Co, Ni below 50 ppm), and particle size distribution (D50 ± 10%). For abrasive applications, friability testing according to FEPA standards provides practical performance indicators. Leading manufacturers typically offer technical grades (99.9%) at $50-80/kg and electronic grades (99.99+%) above $120/kg. Minimum order quantities range from 100g for R&D to 25kg for production volumes. Consider suppliers with ISO 9001 certification and batch traceability, especially for defense or medical applications requiring full material documentation.
Related Manufacturers
- 主营：钽板、钽管、钽棒、钽丝、铌板、铌管、铌棒、钽加工件、铌丝、铌加工件、钒板、钒棒、钒丝、钽坩埚、钽靶材、铌靶材、钒靶材、钽接地环、钽保护管、钽箔、铌坩埚、铌箔、钒箔、钽异形件
- 主营：钨镍铁 钨镍铜、热处理工装料架、真空炉组件、高纯钨钼、玻璃窑炉钼电极、钨钼锆钛坩埚、钨钼电极棒、钼顶头、钨钼流口、钨钼钽铌锆钛各类加工件、钼加热带隔热屏、钨丝钼丝、热电偶保护管、TZM合金、钼加热丝、钨网发热体、钼镧合金管、镧钨合金
- 主营：架桥剂、YW100 锂萃取剂、端羧基液体丁腈橡胶、10-羟基癸酸、苯乙烯磷酸、肉豆蔻酸镁、硬脂酸钴、全氟三丁胺、乙烯基磷酸二乙酯、磷酸锰铁锂、β-磷酸三钙、十一烯酸、钨酸铝、1-乙炔基环已醇、间二异丙苯、锂硅合金、溴甲酚绿、生物活性玻璃、溴代海因树脂颗粒、红铝、龙涎酮、原丁酸三甲酯
- 主营：哈氏合金、不锈钢、耐蚀合金、高温合金、蒙乃尔合金、镍基合金、钴基合金、钛合金、马氏体时效钢、尼莫尼克合金
- 主营：全氟聚醚二醇、全氟三丁胺、聚硅氮烷、特种硅油、特种硅树脂
- 主营：光学平台、激光器、激光染料、高光谱成像相机、高光谱成像、激光护目镜、光谱仪、TMC隔振、气体池、光纤、气体流通池、挠性镜架、光学镜片、光电探测器、面包板、光源、激光控制、滤光片、实验桌、透镜、伺服器、太阳光模拟器
- 主营：养护箱、试验箱、集装箱、试验机、测定仪、养护室、混凝土、恒温恒湿、水泥压力、试验仪器、抗压一体机、移动式标准
- 主营：镍基合金、钛合金、哈氏合金、高温合金、模具钢、沉淀硬化钢、不锈钢、双相不锈钢、特殊合金、钽合金、铌合金、锆合金、板材、棒材、管材、锻件、无缝管、按图加工
- 主营：土工试验机、机械设备、混凝土试验仪器、水工混凝土立方体试件、测绘仪器、智能仪器仪表、力学试验机、水泥砂浆试验仪器、沥青试验仪器、防水卷材试验仪器
- 主营：甲醛释放量气候箱、水泥水化热测定仪、沥青蜡含量、高低温水浴、水泥生料易烧性压实机、人造板划痕试验仪、水泥原料易磨性球磨机、冻土冻结温度、混凝土粉样分层研磨机、家具平整度试验仪、土工布垂直渗透仪、小室法甲醛试验箱、人造板落球冲击试验仪、砂基透水砖透水速率、水泥胶砂抗冻性试验箱
- 主营：透明板、检测仪器、平整度仪、清洗疏通车、刚度试验机、板式测厚仪、冲击试验机、破乳试验机、静载试验机、水平渗透仪、压力试验机、多功能洒水车、网格布试验箱、纯电动消防车、矿物棉振筛机、内外压试验机、相容性试验箱、憎水性测试仪、集装箱养护室、玻璃棉绝热材料、热荷重试验装置、钢管弯曲试验机、正反弯曲试验机、抗冲击试验装置、保温材料制样器
- 主营：贝壳粉、固体机、杨木粉、微景观、萤石矿、水洗砂、钠云母、硅酸盐、磨漂珠、白漂珠、乳胶漆、萤石块、细云母、发光石、黑彩砂、轻钙粉、珠光粉、蛭石粉、夜光沙、云母沙、石棉绒、硅藻泥、珍珠岩、非金属、芙蓉红
- 主营：硒粉、镍粉、硅粉、高纯碳化钒、铜粉、钨粉、二氧化锡、钼粉、锡粉、银粉、碳化钨
- 主营：模具钢、钽合金、温合金、高速钢、钛合金、无缝管、磁合金、圆棒材、圆钢棒、铝合金、时效钢、铌锆合金、钽钨合金、膨胀合金、石油套管、钢板圆钢、钛管线材、板材钢带、钴基合金、钢棒焊丝、钽铌合金、钢板圆棒、哈氏合金、圆棒管材、钛板钢材
- 主营：镍基合金、蒙乃尔合金、哈氏合金、高温合金、高速钢、沉淀硬化钢、航空铝合金、不锈钢、模具钢、合金钢、铝合金、钴基合金、钛合金、稀有金属合金