Tag: Boron Nitride Powder

Boron nitride is a crystal composed of nitrogen atoms and boron atoms. Its chemical composition is 43.6% boron and 56.4% nitrogen. Boron nitride has four different variants: hexagonal boron nitride (HBN), diamond Square Boron Nitride (RBN), Cubic Boron Nitride (CBN) and Wurtzite Boron Nitride (WBN).

Boron Nitride Properties

Boron nitride is resistant to chemical corrosion and is not corroded by inorganic acids and water. The boron-nitrogen bond is broken in hot concentrated alkali, and it begins to oxidize in the air above 1200degC. Boron nitride is slightly soluble in hot acid and insoluble in cold water, with a relative density of 2.25.

Most of the properties of boron nitride are better than carbon materials. For hexagonal boron nitride: low friction coefficient, good high temperature stability, good thermal shock resistance, high strength, high thermal conductivity, low expansion coefficient, high electrical resistivity, corrosion resistance, microwave or transparent Infrared.

Boron Nitride Applications

1. Hexagonal boron nitride has excellent chemical stability, and it neither wets nor affects most metal melts, such as steel, stainless steel, al, fe, ge, bi, si, etc. Therefore, boron nitride can be used as crucibles, boats, liquid metal delivery pipes, rocket nozzles, high-power device bases for smelting and evaporating metals, and can also be used as high-temperature galvanic couple protection and high-temperature electrical insulation materials.

2. Using the heat and corrosion resistance of hexagonal boron nitride, high-temperature components, rocket combustion chamber linings, thermal shielding of spacecraft, corrosion-resistant parts of magnetic fluid generators, etc. can be manufactured.

3. Utilizing the insulating properties of hexagonal boron nitride, it is widely used in high-voltage and high-frequency electricity and plasma arc insulators, as well as insulators of various heaters, heating pipe sleeves and high-temperature, high-frequency, high-voltage insulation and heat dissipation components, and high-frequency application electric furnaces s material.

4. In the electronics industry, it is used as a crucible for the preparation of gallium arsenide, gallium phosphide, and indium phosphide, as a heat sink for semiconductor package heat sinks, heat sinks for phase shifters, heat sinks for traveling wave tube collectors, semiconductors and integrated electrodes P-type diffusion source and microwave window.

5. In the atomic reactor, it is used as a neutron absorbing material and shielding material. It can also be used as infrared, microwave polarizer, infrared filter, optical path of laser instrument, ultra-high pressure pressure transmission material, etc.

6. Hexagonal boron nitride is also an excellent high-temperature lubricant and can be used as a component of self-lubricating bearings. Many physical properties of boron nitride are similar to graphite, so it is called white graphite. It and mica, talc, silicate, fatty acid, etc. are collectively referred to as white solid lubricants.

7. Boron nitride can also be used as an additive for various materials. Boron nitride fiber processed by boron nitride is a medium modulus and high-function fiber. It is an inorganic synthetic engineering material and can be widely used in the chemical industry, textile industry, aerospace technology and other cutting-edge industrial sectors.

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Boron nitride The powder is white and is a crystal made up of nitrogen atoms. The chemical composition of the powder is a mixture of boron and nitrogen (43.6%). There are four types: hexagonal Boron Nitride (HBN), Rhombohedral Boron Nitride (RBN), Cubic boron Nitride (CBN), or wurtzite Nitro Boron (WBN).

What property does boron nitride have?

Boron Nitride Powder is resistant against chemical corrosion. It is also not affected by water or mineral acids. The boron and nitrogen bond is broken by hot concentrated alkali. The air temperature above 1200degC causes the nitride to begin oxidizing. It melts at 3000degC and begins to sublime slightly below 3000degC. Decomposition begins in vacuum around 2700degC. Boron Nitride Powder is slightly soluble when heated acid is used, but insoluble with cold water.
Carbon materials are inferior in terms of most properties to boron carbide. For hexagonal Boron Nitride: Low friction coefficient, Good high temperature stability and Thermal shock Resistance, High Strength, High Thermal Conductivity, Low Expansion Coefficient, High Resistivity, Corrosion resistance, Microwave or Transparent Infrared.

What are the different methods of preparation for boron nitride?

The boron-nitride is commonly produced as a powder with a structure similar to graphite, also known as white graphite. The second is diamond type. Similar to the conversion of graphite to a diamond, graphite boron-nitride powder can be converted into diamond boron-nitride powder under high temperature and pressure.

High Temperature and High Pressure Synthesis
Wentorf produced cubic BN first in 1957. The cubic boron nitride can be directly converted from pure hexagonal boron nitride, HBN, when the pressure and temperature are high enough. Subsequently it was found that the use catalysts can reduce the transition pressure and temperature. The high cost of preparation and the complexity of equipment limit its industrial use.

Chemical vapor synthesis
Sokolowski was the first to use pulsed-plasma technology in 1979 for preparing cubic boron (CBN), at low temperature, and under low pressure. Equipment is simple, and the process can be easily realized.

Technology for carbothermic synthesis
The method is based on using boric acid, a raw material, as an additive to silicon carbide. Ammonia nitriding then produces boron oxide. The resultant product has a high purity, and is a valuable material for composite materials.

Ion beamsputtering
The mixed product is made using particle beam deposition. It is possible to achieve a product with a morphology that is controlled, even though this method contains fewer impurities.

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Boron nitride The crystal is a hexagonal crystal, similar in structure to graphite. Because of its performance similarities, it is often called “white Graphite”.
Boron Nitride is an excellent dielectric at high temperatures. It is an excellent heat dissipation and high temperature insulating material. Boron Nitride is chemically stable, and it can resist erosion of most molten metallic materials. It also has self-lubricating characteristics.

Boron nitride ceramics (BN) is a novel industrial material developed by the aerospace and electronic industries. It has many applications in production and industry.

Research on boron Nitride is currently focused primarily on the hexagonal phase of boron Nitride (hBN) and its cubic phase (cBN). Hexagonal Borosidria has good performance at high temperatures, as well as lubricity and thermal conductivity. Recent studies show that the hexagonal boron nitride is in a stable thermodynamic state at room pressure and temperature. It is still mainly used as a source of raw materials for the production of cubic boron-nitride. Cubic Boron Nitride is an artificially synthesized material with many application possibilities.

As a rule, hexagonal boron-nitride is used in the high temperature/high pressure method. The excellent properties of cubic boran nitride have attracted many scientists to research the synthesis of cubic boran nitride. The number of new preparation methods is endless, and they are all moving towards a low temperature, low pressure, simple, and feasible direction. The synthesis and use of nano boron ceramics has been a hot topic in recent years due to the growth of nanotechnology.

Hexagonal boran nitride has been called white graphite due to its similarity in crystal structure and physical and chemistry properties. Hexagonal boran nitride can be used to make sintered ceramics. H-BN ceramics are used widely in high-temperature insulating components, metallurgy, aviation, and atomic energy because they have good electrical insulation properties and low thermal coefficient. The superior performance of cubic boron-nitride makes it a popular raw material in the synthesis.

Ceramics containing boron-nitride exhibit excellent thermal stability, as well as dielectric properties. It is among the few compounds which can reach a temperature of decomposition. It exhibits excellent thermal and electric stability over a wide temperature spectrum. This type of ceramic is not currently used in the radome because it has low strength and hardness. It also has a high thermal conductivity.

In the field of materials science, boron is nitride is a highly preferred advanced ceramic material due to its superior mechanical characteristics. Due to the harsh conditions in the current synthesis, this has an impact on boron nitride’s application to some extent. This new synthesis method has been a major focus in the study of Boron Nitride. Select a reaction precursor with excellent thermodynamic properties and use them to reduce the temperature induced externally and the reaction temperature. This will allow you to control the morphology of the final product. Controlling the reaction conditions, and using the right reaction process, can affect the particle size and shape of the final product.

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Boron nitride It’s been around for more than a century. As a high-temperature grease, hexagonal boron was the first application. White graphite is a common name because of its similarity to graphite in terms of both its structure and properties.

Boron Nitride Powder Properties

Boron Nitride is resistant to corrosion by chemicals and mineral acids. It is also not affected by water and mineral acid. The boron and nitrogen bond is broken by hot concentrated alkali. Boron Nitride begins to oxidize at temperatures above 1200degC. It decomposes around 2700degC in vacuum. Boron Nitride is slightly soluble when heated acid is used, but insoluble with cold water.

Most properties of boron materials are better than those of carbon materials. The following properties are found in hexagonal boron Nitride: Low friction coefficient; good high temperature stability; good thermal shock resistance; high strength; high thermal conductivity.


Boron Nitride is a hexagonal system of crystals. The most common one is the graphite crystal lattice. There are other forms as well, such as: Rhombohedral Boron Nitride (rBN), Cubic Boron Nitride (cBN), or wurtzite boronnitride.

Boron nitride Powder Applications

Cubic-boron nitride has an excellent heat resistance in addition to its excellent wear resistance. It can cut heat resistant steel, ferroalloys and hardened metals. At a relatively high temperature, it can cut Si-Al and Si-Cr alloys and chilled rolls with high hardness.

It is a semiconductor material with a wide band-gap (band-gap of 6.4 eV). Cubic-boron nitride exhibits high thermal conductivity, good resistivity, low dielectric, high breakdown field, dual-type-doping, and excellent electrical properties. They all share a wide band-gap, which makes them ideal for electronics that operate in extreme environments.

In comparison with SiC or GaN, diamond and cubic-boronnitride have superior properties. These include a wider band gap and greater mobility. Diamond and cBN are superior materials for extreme electronics.

Due to the high transmittance and hardness of the cubic-boron film, which is approximately 200 nm, and its ability to cover the entire range of wavelengths, including ultraviolet, this coating can be used as a surface coat for certain optical components.

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