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Comprehensively understand the heat conduction material hexagonal boron nitride HBN

1. What is boron nitride?
Boron nitride is a crystal (BN) composed of nitrogen atoms and boron atoms, and its chemical composition is 43.6% boron and 56.4% nitrogen.

2. What are the classifications of boron nitride?

According to the crystal type, boron nitride is divided into hexagonal boron nitride, cubic boron nitride, rhombohedral boron nitride and wurtzite boron nitride. However, the current research on boron nitride mainly focuses on the two crystal forms of hexagonal boron nitride and cubic boron nitride. Hongwu Nano mainly focuses on the production and supply of hexagonal boron nitride powder, which includes three categories: nanometer, submicron and micron.

3. What are the physical and chemical properties of hexagonal boron nitride?
The crystal structure of hexagonal boron nitride has a similar layered structure of graphite, which is a white powder that is loose, lubricating, easy to absorb, and light in weight. The theoretical density is 2.29g/cm3, the Mohs hardness is 2, and the chemical properties are extremely stable. The product has high humidity resistance, and the temperature can reach 2800℃ when used in nitrogen or argon. It not only has a low thermal expansion coefficient, but also a high thermal conductivity. It is not only a good conductor of heat, but also a typical electrical insulator. The thermal conductivity of BN measured at 300k using high-purity single crystal is 730w/mk.

4. How is hexagonal boron nitride prepared?
There are many synthetic methods for hexagonal boron nitride, but the basic principle is that the boron source and the nitrogen source are heated and refined together. Hexagonal boron nitride is the most commonly used form of boron nitride. Its preparation methods include borax-urea method, hydrothermal synthesis method, chemical vapor deposition method and precursor method.
Compared with the process flow of various methods, it is not difficult to produce boron nitride, but the process conditions of each process have a great impact on the quality and output of the product. In order to reduce costs and improve quality, Hongwu Nano believes that several issues that must be paid attention to through production practices are: the purity and proportion of raw materials, the influence of reaction temperature and time, the influence of washing methods and the influence of drying processes. Of course, production equipment, production environment, etc. will have an impact to a certain extent.

5. What are the main application areas of hexagonal boron nitride?
Evaporation boat ceramic products;
LED thermally conductive packaging materials;
Boron nitride ceramic parts;
Additives for plastics and refractory materials;
Metallurgical stripping machine;
Lubricant
Thermal shielding materials in the aerospace field;
Atomic reactor structural materials;
Cosmetic fillers;
Laser anti-counterfeiting aluminized trademark hot stamping material.

If you need further inquiries about hexagonal boron nitride product information, please contact us online.  https://www.hwnanomaterial.com

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High Functional Nano White Graphite – Hexagonal Boron Nitride Nanoparticle

As one of the best heat conduction materials in ceramic materials, HBN has a structure similar to that of graphite. It has a hexagonal layer structure and is loose, lubricated, light and soft, with high processability and color. White is therefore also known as “white graphite.”
It is not only a good conductor of heat, but also a typical electrical insulator. It is an ideal high-frequency insulation, high-voltage insulation, high-temperature insulation material.

Boron nitride ceramics, composite ceramics, conductive ceramics, superhard materials, mold release lubricants, high temperature coatings, thermal conductive fillers.

1. High temperature lubricant
h-BN has excellent high-temperature lubricity. When used as a lubricant, it can be dispersed in heat-resistant grease, water or solvent. Sprayed on the friction surface, the solvent evaporates to form a dry mold, because h-BN and steel Stainless steel, aluminum, etc. are neither wet nor active, so it is often used in places resistant to molten metal corrosion, such as crucibles, boats, liquid financial pipes, etc.

2. Thermally conductive filler
BN has been widely used as a filler in thermally conductive composites to solve the problem of short-circuiting of high-resistivity materials required for thermal conductive materials to come into contact with electrical components in operation. The ultrasonically exfoliated two-dimensional boron nitride nanosheets and one-dimensional cellulose nanofibers were blended to prepare a composite with a thermal conductivity of up to 180 W/(m·K), which is the highest thermal conductivity

3. Boron nitride has a significant chemical inertness at high temperatures, allowing boron nitride(BN) coatings to protect materials such as aluminum, magnesium, zinc alloys from high temperature oxidation.
When the boron nitride coating is on a refractory material or a ceramic vessel, it can effectively protect its oxidation resistance even at a temperature of up to 1273K.

4. The ultra-high temperature mold release agent using solid lubricant boron nitride as raw material can maintain excellent lubricity and mold release property under extreme high temperature, so it is suitable for molding diamond tools, molding of high temperature hardening resin, and sintering of metal. Forming, pressing of aluminum frame, molding of glass, demoulding of die casting, etc..

5. High insulation and high thermal conductivity ceramic products
Boron nitride ceramics have good heat resistance, thermal stability, thermal conductivity, high temperature dielectric strength, and are ideal heat dissipation materials and high temperature insulation materials. Because of its good chemical stability, it is resistant to most of the molten metal. The hardness of the product is low (Mohs strength 2), so it can be machined with an accuracy of 1/100mm. It is commonly used in the manufacture of high-temperature containers for metallurgical melting, semiconductor heat-dissipating insulation parts, high-temperature bearings, thermowells, and glass forming dies.

6. Synthetic cubic boron nitride
C-BN is another common form of boron nitride, which is second only to diamonds in hardness and is also a theoretical low temperature stable phase. The use of h-BN in the participation of the catalyst, at high temperature (1800℃), high pressure (800 MPa) into a hard, such as diamond c-BN boron nitride, is currently one of the main methods of synthesizing boron nitride.

Related reading :Hexagonal Boron Nitride Nanoparticle  Hexagonal Boron Nitride

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Various Applications of Boron Nitride powder

Hexagonal boron nitride is a kind of loose white powder, similar to the properties of graphite, which has known as the “white graphite”. It has good electrical insulation, thermal resistance and chemical resistance; anti-oxidation temperature can up to 900 ℃. Because hexagonal boron nitride has low coefficient of thermal expansion and high thermal conductivity, its thermal shock resistance is excellent.

Solid Boron Nitride with a variety of excellent performance that can be widely used in high-voltage high-frequency electric insulators and plasma arc, automatic welding temperature frame coating, high frequency induction furnace materials, semiconductor phase admixture, atomic reactor construction materials, packaging materials to prevent neutron radiation, radar transfer window, the media radar antenna and composition of rocket engines and so on.

Hexagonal boron nitride is not only a good conductor of heat, but also the typical electrical insulator. HBN has excellent chemical stability. For most molten metals, such as steel, stainless steel, Al, Fe, Ge, Bi, Cu, Sb, Sn, In, Cd, Ni, Zn, etc., it is neither wetting nor acting with each other. Therefore, it is used as a high temperature thermocouple protection kits, molten metal crucibles, containers, liquid metal pipeline, pump parts, mold steel and high-temperature electrical insulation materials. Hexagonal boron nitride (HBN) has a high thermal conductivity, low dielectric constant and dielectric loss, reliable electrical insulation properties, low coefficient of thermal expansion, good thermal shock resistance, excellent processing performance, for most metals are not invasive, light, infrared and microwave-transparent, and has very high heat resistance, excellent performance, which is an important aerospace materials that has been widely used in launch vehicles, spacecraft, missiles, satellites and other spacecraft radio system. This new material has many excellent properties with hardness better than diamond crystal, tougher than commercial carbide, and cubic boron nitride anti-oxidation temperature higher than the single crystal itself, HBN is expected to become a new generation of steel materials processing industry in the tool material so there is no doubt that it has broad application prospects.

We Hongwu International Group Ltd., a high-tech enterprise that can manufactures hexagonal boron nitride powder with high purity and quality and particle size varying from 100nm to 5um. Should you have any needs or questions about HBN, please don’t hesitate to contact us.