3U Super Hard Products Co., LtD.

CBN (Cubic Boron Nitride) monocrystalline is the super hard material of high thermal stability, its hardness is just second to diamond. The synthetic CBN crystal is converted from hBN under extremely high pressure (6 G Pa -7 G Pa) and temperature (1400 Ўж ~1500Ўж). Different from diamond, CBN will not react with iron and nickel elements (steel and super alloy). The combination of thermal and chemical stability and hardness make CBN the most desirable superabrasive crystal for grinding ferrous alloys and super alloy materials.

The high purity monocrystalline CBN crystal is colorless and transparent. However, most synthetic CBN crystals for industrial applications have different colors dependent on the growth environment. During crystal growth process, if crystal contains the amount of element N outweighing element B, the crystal appears yellow color; otherwise, the color turns into black. The crystals with gold, amber, brown colors are between those two conditions and also depend on growth conditions.

The strength of CBN crystal is a predominant factor in determining grinding characteristics. Toughness Index (TI) is commonly used for indicating the strength of the crystal under impact force. TI value represents time needed (seconds) to break down 50% of grains and all those debris pass through the breakdown sieve defined by ANSI and FEPA standards. Lower TI means more friable to the force. CBN crystal due to different growth conditions and processing technology, its thermal stability also varies from product to product. Since significant amount CBN grain are used in vitreous bond application. Crystal thermal stability is a critical factor which tool makers are using to select appropriate crystal to meet their processing requirements.

Thermal Toughness Index (TTI) represents the crystal strength after crystals passes through a heat treatment at 1100Ўж under Ar atmosphere for 10 minutes. Low TTI indicates the thermal stability of the crystal and those crystals may not be suitable for those processed require high temperature. High TI CBN is recommended for electroplating tools, both high TI and TTI are more suitable for vitrified and metal bonded tools. TI from low to medium CBN is more suitable for resin bonded tool. In some cases, crystal with a balanced low TI and TTI is desired for vitrified bond application.
The crystal grinding performance also depends on crystal fracture modes. There are two common modes:
1. Macro fracture, fracture as block chip under high force, which regenerates cutting edges.
2. Micro fracture, fracture through nano-fracture moderate force, which offers continuous sharp cutting points.

3U Super Hard Products well engineering CBN product series provide wide range of crystal characteristics to meet all requirements from various industrial applications and have been extensively accepted in grinding, finishing and lapping applications from resin, vitrified, electroplated to metal bond systems. Famous engineering team is also willing to work with customers to develop customer-design product to meet customerЎЇs special needs. The experienced and knowledgeable engineering team is the guarantee for satisfied and speedy delivery.

CBN1000

CBN1000 is a black, irregular shaped and friable mono-crystal. It is primarily used for resin bond tools and grinding wheels, also for vitrified bond tools, which have good self sharpening ability.

CBN1150

CBN1150 is a black colored, regular shaped and semi-tough monocrystal. It is primarily used for resin, vitrified bond grinding wheels.

CBN1200

CBN1200 comprises bright black colored, regular shaped monocrystals with high toughness and good thermal stability. It is primarily used for metal, vitrified bond and electroplated tools and grinding wheels, which have longer service life, suitable for grinding ferrous metals and alloy.

CBN2100

CBN2100 consists of clear amber colored, regular shaped monocrystals with high toughness and good thermal stability. It is used primarily for metal, vitrified bond and electroplated tools and grinding wheels, which have longer service life, suitable for grinding ferrous metals and alloy.

CBN2300

CBN2300 is a golden yellow colored, transparent, regular shaped, strong and very tough abrasive. It is used for metal, vitrified bond and electroplated tools and grinding wheels, which have longer service life.

CBN2800

CBN2800 comprises dark brown, regular shaped, smooth, transparent and very tough monocrystals. It is used for metal, vitrified bond electroplated tools and grinding wheels, which have longer service life and good self-sharpen ability.