Boron Nitride Properties

Boron nitride is a crystal made up of nitrogen atoms and boron atoms. The crystal structure is separated right into hexagonal boron nitride (HBN), closely stuffed hexagonal boron nitride (WBN) and cubic boron nitride.

The crystal structure of hexagonal boron nitride has a comparable graphite split structure, showing a loose, lubricating, moisture-absorbing, light as well as other residential or commercial properties of white powder, so it is additionally called "white graphite". Academic thickness 2.27 g/cm3, specific gravity: 2.43, Mohr hardness = 2.
Hexagonal boron nitride has good electrical insulation, thermal conductivity, chemical security, no evident melting factor, 3000 ℃ in 0.1 MPA nitrogen, warm resistance to 2000 ℃ in neutral decrease ambience, 2800 ℃ in nitrogen and also argon, inadequate security in oxygen atmosphere, and temperature level below 1000 ℃. The expansion coefficient of hexagonal boron nitride amounts that of quartz, however its thermal conductivity is 10 times that of quartz.
Hexagonal boron nitride does not dissolve cool water. When the water is boiled, it hydrolyses very gradually and also generates a percentage of boric acid as well as ammonia, which does not react with weak acid as well as strong base at room temperature level. It is slightly soluble in warm acid and also can only be decomposed with molten salt hydroxide and also potassium hydroxide.

Boron Nitride Characteristics
1. High warmth resistance: sublimation at 3000 ℃, its stamina at 1800 ℃ is twice that at room temperature, air-cooled at 1500 ℃ to area temperature for dozens of times, as well as does not soften at 2800 ℃ in inert gas.
2. High thermal conductivity: the hot-pressed items are the same as pure iron, and also 33W/M. K has the greatest thermal conductivity amongst ceramic materials above 530C.
3, low thermal growth coefficient: the development coefficient of 2 × & times; 10-6 is second just to quartz glass, which is the tiniest in ceramics, paired with its high thermal conductivity, so the thermal shock resistance is very good.
4. Outstanding electric homes: great insulation at heat, 1014 Ω& Omega;- cm,2000 at 25 ℃ and also 103 Ω& Omega;- cm at 25 ℃. It is the very best high temperature insulating product in ceramics, with break down voltage 3KV/MV, reduced dielectric loss 108HZ 2.5 × & times; 10-4, dielectric constant 4, clear to microwave and also infrared.
5. Excellent rust resistance: it does not react with basic metals (iron, copper, light weight aluminum, lead, and so on), rare earth metals, precious metals, semiconductor materials (germanium, silicon, potassium arsenide), glass, liquified salts (crystal, fluoride, slag), inorganic acid and also antacid.
6. Low rubbing coefficient: U is 0.16, does not increase at high temperature, is a lot more resistant to heat than molybdenum disulfide as well as graphite, oxidation environment can be used up to 900C, vacuum can be utilized at 2000 ℃.
7. High purity good B is high: its contamination content is much less than 10PPM, yet B web content is greater than 43.6%.
8. Machinability: its solidity is Morse 2, so it can be processed right into parts with high accuracy by general machining approaches.

What is hexagonal boron nitride used in?
Hexagonal boron nitride can be utilized in the manufacture of TiB2/BN composite porcelains, progressed refractories as well as superhard products, separation rings of horizontal continuous rolling steel, high temperature resistant lubricating substances and also high temperature finishes, in addition to resources for the synthesis of cubic boron nitride.

Particular usages:
1. Boron nitride is a mold launch representative for steel creating and a lubricant for metal wire drawing.
2. Unique electrolysis and also resistance products of boron nitride at high temperature.
3. Boron nitride appropriates for high temperature strong lubricants, extrusion antiwear additives, ceramic composite ingredients, refractories and also antioxidant additives, specifically for liquified steel Faustian occasions, warmth improvement additives and high temperature resistant insulation materials.
4. Boron nitride appropriates for heat-sealed desiccant of transistor as well as additive of polymer such as plastic material.
5. Boron nitride products pressed right into different forms can be used as heat, high stress, insulation and warm dissipation components.
6. Boron nitride is a thermal protecting material in aerospace.
7. With the participation of driver, cubic boron nitride can be transformed into cubic boron nitride as hard as diamond by high temperature and high stress therapy.
8. Boron nitride is the structural product of atomic reactor.
9. Boron nitride appropriates for the nozzles of airplane and rocket engines.
10. Boron nitride is an insulator of high voltage, high regularity power as well as plasma arc.
11. Boron nitride is a product packaging material to stop neutron radiation.
12. The superhard product made from boron nitride can be made into high-speed cutting tools as well as drills for geological expedition and oil boring.
13. Boron nitride is used in metallurgy for separation ring of continual spreading steel, circulation groove of amorphous iron, demoulding agent of continual spreading aluminum (various optical glass stripping agents).
14. Boron nitride is an evaporator for all kinds of capacitor film plating, picture tube plating, present plating.
15. Boron nitride appropriates for all type of fresh-keeping aluminized bags and more.
16. Boron nitride is a selection of laser anti-counterfeiting light weight aluminum plating, hallmark gilding products, all kinds of cigarette tags, beer labels, product packaging boxes, cigarette boxes.
17. Boron nitride is suitable for cosmetics. Can be utilized for lipstick fillers, non-toxic and lubricating, but additionally shiny.

Boron Nitride Rate
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