Boron nitride BN (hexagonal boron nitride)

Characteristics: Boron nitride is a crystal composed of nitrogen atoms and boron atoms. The crystal structure is divided into: hexagonal boron nitride (B), close-packed hexagonal boron nitride (B) and cubic boron nitride, among which hexagonal boron nitride The crystal structure of graphite has a similar layered structure to graphite, and is a white powder that is loose, lubricated, easy to absorb moisture, and light in weight, so it is also called white graphite. Theoretical density., Specific gravity:, Mohs hardness is. Hexagonal boron nitride has good electrical insulation, thermal conductivity, chemical stability, no obvious melting point, in nitrogen at ℃, in a neutral reducing atmosphere, heat resistant to ℃, the use temperature in nitrogen and argon can reach ℃, the stability in oxygen atmosphere is poor, the use temperature is below ℃. Hexagonal boron nitride has an expansion coefficient equivalent to that of quartz, but its thermal conductivity is ten times that of quartz. It also has good lubricity at high temperatures. It is an excellent high-temperature solid lubricant with strong neutron absorption ability, stable chemical properties, and chemical inertness to almost all molten metals.
Hexagonal boron nitride is insoluble in cold water. When water is boiled, it hydrolyzes very slowly and produces a small amount of boric acid and ammonia. It does not react with weak acids and strong alkali at room temperature. It is slightly soluble in hot acid and can be used with molten sodium hydroxide. , can be decomposed by treatment with potassium hydroxide. It has considerable corrosion resistance to various inorganic acids, alkalis, salt solutions and organic solvents.
Hexagonal boron nitride is one of the materials with the largest thermal conductivity among ceramic materials. The thermal conductivity is ten times that of quartz. High thermal conductivity hot pressed products are. The same expansion coefficient as pure iron is equivalent to quartz, and it is the smallest among ceramics. , the thermal expansion coefficient in the axial direction is ^ and in the axial direction is ^, so the thermal shock resistance is very good. Boron nitride is also the best high-temperature insulating material among ceramics. Its breakdown voltage and low dielectric loss are .^, its dielectric constant is , and it can transmit microwaves and infrared rays.
In terms of mechanical properties: it has the advantages of non-abrasion, low wear, dimensional safety, good lubricity, fire resistance and easy processing.
In terms of electrical characteristics: it has the advantages of good dielectric strength, low dielectric constant, low loss at high frequency, microwave penetration, and good electrical insulation.
In terms of thermal properties: it has the advantages of high thermal conductivity, high heat capacity, low thermal expansion, thermal shock resistance, high temperature lubricity and high temperature stability.
In terms of chemical properties: it has the advantages of non-toxicity, chemical stability, corrosion resistance, oxidation resistance, low moisture, biological stability and non-stick properties.
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Boron oxide

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Kilogram carton

Kilogram carton< br/> Transportation: Domestic express () can be used, and the goods will arrive within three days.






Boron nitride parameters:
, high heat resistance: ℃ sublimation, its strength ℃ is Times of room temperature, it will not break when air-cooled to room temperature for dozens of times, and will not soften in inert gas.
High thermal conductivity: Hot pressed products are. Like pure iron, it is the material with the largest thermal conductivity among ceramic materials above ℃.
Low thermal expansion coefficient: Its expansion coefficient is second only to quartz glass and is the smallest among ceramics. In addition, it has high thermal conductivity, so its thermal shock resistance is very good.
Excellent electrical properties: good high-temperature insulation, ℃ can reach ℃, it is the best high-temperature insulating material among ceramics, breakdown voltage, low dielectric loss is., dielectric constant is, Transparent to microwaves and infrared rays.
Good corrosion resistance: compatible with general metals (iron, copper, aluminum, lead, etc.), rare earth metals, precious metals, semiconductor materials (germanium, silicon, potassium arsenide), glass, molten salt (crystal stone) , fluoride, slag), inorganic acids, and alkali do not react.
, low friction coefficient: ., does not increase at high temperatures, is more resistant to high temperatures than molybdenum disulfide and graphite, can be used in oxidizing atmospheres up to ℃, and in vacuum can be used up to ℃.
High purity and high boron content: its impurity content is less than 0.0%, while the boron content is greater than .%.
Machinability: Its hardness is Mohs, so it can be processed into high-precision parts and components using general machining methods.
Precautions for storage and transportation
This product is non-toxic, harmless, non-flammable and non-explosive and can be stored and transported as general chemicals.
Keep in a cool, dry place, protected from rain and moisture, and avoid accidental ingestion.
Output
The annual output of boron nitride reaches many tons.