What is the difference between hexagonal boron nitride and cubic boron nitride?

Hexagonal Boron Nitride

Hexagonal boron nitride (similar to graphite, also known as graphite boron nitride, white graphite). Relative density 2.25. The Mohs hardness is about 2. It is a white powder that melts at about 3000°C under high pressure. Has good electrical insulation, thermal conductivity, corrosion resistance and good lubricity. Good chemical stability, no reaction with water, acid and alkali at room temperature. Reacts with hot concentrated or molten alkali and hot chlorine. Can withstand 2000 ℃ high temperature. Has a strong ability to withdraw electrons. It can be obtained by heating borax and ammonium chloride in a stream of ammonia.

BN and graphite are isoelectronic bodies. Known as white graphite, it has a graphite-like layered structure with good lubricity, electrical insulation, thermal conductivity and chemical resistance, as well as the ability to absorb neutrons. Chemically stable and chemically inert to all molten metals, shaped products are easy to process and have high moisture resistance. The melting point is 3000 ℃ under nitrogen pressure, and it sublimates at 2500 ℃ under atmospheric pressure. Its theoretical density is 2.29 grams per cubic centimeter. Mohs hardness 2, oxidation resistance temperature 900 °C, high temperature resistance 2000 °C, melting point 3000 °C in nitrogen and argon. It is a chemically inert material, stable to 2700 °C in argon atmosphere.

 Cubic Boron Nitride

Cubic boron nitride (diamond type). For black or brown granular crystals. Relative density 3.48. Melting point 3000 ℃. The hardness is comparable to that of diamonds. High temperature stability is better than diamond. Boron and nitrogen can be directly synthesized under high temperature and high pressure conditions.

Cubic Boron Nitride: The molecular formula is BN, the crystal structure is similar to that of diamond, and the hardness is slightly lower than that of diamond, which is HV72000-98000 MPa, and is often used as abrasive and tool material. In 1957, RH Wintorf of the United States first developed the Rubik's Cube. In 2013, Yanshan University successfully synthesized a new material of cubic boron nitride with nano-twin structure. This new material has several excellent properties. Its hardness is higher than that of diamond single crystal, its toughness is better than that of commercial cemented carbide, and its oxidation resistance temperature is higher than that of cubic boron nitride single crystal itself. It is expected to become a new generation of tool materials in the steel processing industry.

Boron Nitride Overview:

Boron nitride industrial powder is a pure white ceramic material with a hexagonal crystal structure similar to graphite. Boron Nitride can withstand temperatures in excess of 2000°C and, depending on the grade, has a dielectric strength approaching 1000 volts/mil. Boron Nitride is hot - pressed into billets that can be easily machined into bars, rods, sheets and even custom shapes.

Application of Boron Nitride:

1. Metal forming release agent and metal wire drawing lubricant.

2. Special electrolytic and resistance materials in high temperature state.

3. High-temperature solid lubricants, extrusion anti-wear additives, ceramic composite production additives, refractory materials and antioxidant additives, especially in the case of corrosion resistance of molten metals, heat-enhancing additives, high-temperature insulating materials.

4. Heat-sealing desiccant for transistors and additives for polymers such as plastic resins.

5. Boron nitride products pressed into various shapes can be used as high temperature, high pressure, insulation and heat dissipation components.

6. Aerospace heat shielding materials.

7. With the participation of catalyst, after high temperature and high pressure treatment, it can be converted into cubic boron nitride as hard as diamond.

8. Structural materials for atomic reactors.

9. Aircraft, rocket engine nozzles.

10. Insulators for high-voltage and high-frequency electricity and plasma arcs.

11. Packaging materials to prevent neutron radiation.

12. The superhard material processed by boron nitride can be made into high-speed cutting tools and drill bits for geological exploration and oil drilling.

13. Metallurgical continuous casting steel separation ring, amorphous iron launder, continuous casting aluminum mold release agent (various optical glass mold release agents)

14. Make various kinds of capacitor film aluminum plating, picture tube aluminum plating, display aluminum plating and other evaporation boats.

15. All kinds of fresh-keeping aluminized packaging bags, etc.

16. Various laser anti-counterfeiting aluminum plating, brand bronzing materials, various cigarette labels, beer labels, packaging boxes, cigarette packaging boxes, etc.

17. The filler used for lipstick in cosmetics is non-toxic, lubricating and shiny.

In optical applications, c-BN films are suitable as surface coatings for some optical components due to their high hardness and high transmittance in the entire wavelength range from ultraviolet (about 200 nm) to far-infrared, especially for zinc selenide (ZnSe) , Zinc sulfide (ZnS) and other window materials coating. In addition, it has good thermal shock resistance and hardness, and is expected to be an ideal window material for high-power lasers and lasers. detector.

Boron Nitride Price:

The price of boron nitride will change randomly with factors such as production cost, transportation cost, international situation, exchange rate and boron nitride market supply and demand. Tanki New Materials Co., Ltd. aims to help industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full range of customized services. If you are looking for Boron Nitride, please feel free to send an inquiry for the latest price of Boron Nitride.

Boron Nitride Supplier:

As a global supplier of boron nitride, Tanki New Materials has extensive experience in the performance, application and cost-effective manufacturing of advanced and engineered materials. The company has successfully developed a series of powder materials (titanium nitride, silicon nitride, titanium nitride, etc.) high-purity targets, functional ceramics and structural devices, and provides OEM services.