Product Name: Silicon hexaboride (SiB6) 
Specification: 0.8-10um (D50) 
Appearance: Irregular 
Color: Black Grey 
Features: high transparency, low thermal expansion coefficient, good chemical stability, excellent thermal shock resistance and corrosion resistance, as well as good mechanical strength and electrical insulation performance, oxidation resistance, thermal shock resistance, and chemical erosion resistance 
Application: Abrasives and grinding, engineering materials, refractory materials and other fields

Boron silicide (SiB6);  Boron silicide;  Silicon boride; 

CAS:12008-29-6   

Appearance: Black gray powder 

EINECS:234-535-8 

Molecular formula: SiB6 

Molecular weight: 92.952 

Relative density: 3.0g/cm3 

Melting point: 2200 ℃ 

High purity silicon hexaboride process: 

Boron trioxide and potassium borohydride are ball milled and mixed under argon protection, pressed into blocks, and loaded into a vacuum carbon tube furnace. They are then evacuated and kept at 750 ℃ for 5 hours; Raise the temperature to 1250 ℃, continue to maintain the temperature until the furnace pressure is slightly positive, and the reduction reaction is completely completed. The mixture of monomer boron and potassium hydroxide obtained in the graphite crucible is heated and cleaned in distilled water, dried, and boron powder is obtained; After ball milling and mixing boron powder and silicon powder, they are loaded into a self propagating combustion reactor. The reactor is evacuated to a vacuum degree of 1 Pa, and the tungsten wire is heated by electricity to ignite the zirconium powder for high-temperature self propagating combustion reaction. After the reaction is completed, the temperature is lowered and impurities are removed to obtain high-purity hexaborosilicate Using boron trioxide and potassium borohydride as raw materials, the raw material cost is relatively low, and the entire process is reasonable and controllable. The purity of the produced silicon hexaboride is 99.5%, which is suitable for industrial production. 

Application of silicon hexaboride: 

B6Si can effectively promote the sintering of boron carbide ceramics and improve the mechanical properties of the material. 

2. Due to its heat resistance and high impact resistance, hexaborosilicate is relatively inexpensive and often used in resin grinding wheels as the main abrasive. 

3. Boron silicide is widely used in various hard alloys and is also an ideal choice for engineering ceramic materials and sandblasting nozzles. It is also used to manufacture gas turbine blades, other shaped sintered parts, and seals, and as an antioxidant for refractory materials. 

4. Hexaboride silicon improves thermal conductivity in conductive silver paste: Hexaboride silicon has high thermal conductivity, which can effectively enhance the thermal conductivity of conductive silver paste, help dissipate the heat generated by electronic components during operation, protect the stability of components, and extend their service life. Hexaboron silicide has excellent chemical stability and oxidation resistance at high temperatures, which helps maintain the electrical properties of silver paste in harsh environments, especially under high-temperature working conditions. 

Storage conditions: 

When storing, boron silicide should be sealed and stored in a dry and cool environment to avoid long-term exposure to air to prevent moisture and aggregation, which may affect its dispersibility and effectiveness. In addition, heavy pressure should be avoided during storage and isolated from oxidants. During transportation, it can be handled as regular cargo.