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Boron Nitride Properties

Boron nitride is a crystal made up of nitrogen atoms as well as boron atoms. The crystal structure is split into hexagonal boron nitride (HBN), very closely stuffed hexagonal boron nitride (WBN) as well as cubic boron nitride.

The crystal structure of hexagonal boron nitride has a similar graphite split framework, showing a loosened, lubricating, moisture-absorbing, light as well as other residential properties of white powder, so it is likewise called "white graphite". Theoretical thickness 2.27 g/cm3, details gravity: 2.43, Mohr solidity = 2.
Hexagonal boron nitride has excellent electrical insulation, thermal conductivity, chemical stability, no noticeable melting point, 3000 ℃ in 0.1 MPA nitrogen, heat resistance to 2000 ℃ in neutral reduction atmosphere, 2800 ℃ in nitrogen and argon, bad stability in oxygen environment, and also temperature level below 1000 ℃. The development coefficient of hexagonal boron nitride is equivalent to that of quartz, but its thermal conductivity is 10 times that of quartz.
Hexagonal boron nitride does not dissolve cool water. When the water is boiled, it hydrolyses extremely slowly and produces a small amount of boric acid and ammonia, which does not respond with weak acid and also strong base at area temperature. It is slightly soluble in hot acid and also can just be decomposed with liquified sodium hydroxide and potassium hydroxide.

Boron Nitride Features
1. High heat resistance: sublimation at 3000 ℃, its strength at 1800 ℃ is twice that at room temperature level, air-cooled at 1500 ℃ to space temperature level for lots of times, and does not soften at 2800 ℃ in inert gas.
2. High thermal conductivity: the hot-pressed products are the same as pure iron, and 33W/M. K has the highest thermal conductivity among ceramic materials over 530C.
3, low thermal development coefficient: the expansion coefficient of 2 × & times; 10-6 is 2nd only to quartz glass, which is the smallest in ceramics, coupled with its high thermal conductivity, so the thermal shock resistance is great.
4. Outstanding electric residential or commercial properties: great insulation at high temperature, 1014 Ω& Omega;- cm,2000 at 25 ℃ as well as 103 Ω& Omega;- cm at 25 ℃. It is the most effective heat insulating material in ceramics, with breakdown voltage 3KV/MV, low dielectric loss 108HZ 2.5 × & times; 10-4, dielectric continuous 4, transparent to microwave as well as infrared.
5. Good rust resistance: it does not react with basic metals (iron, copper, light weight aluminum, lead, etc), rare planet steels, rare-earth elements, semiconductor products (germanium, silicon, potassium arsenide), glass, molten salts (crystal, fluoride, slag), not natural acid as well as antacid.
6. Reduced friction coefficient: U is 0.16, does not increase at high temperature, is extra resistant to heat than molybdenum disulfide and also graphite, oxidation atmosphere can be used up to 900C, vacuum can be used at 2000 ℃.
7. High pureness great B is high: its impurity content is less than 10PPM, however B web content is greater than 43.6%.
8. Machinability: its hardness is Morse 2, so it can be processed into parts with high accuracy by basic machining methods.

What is hexagonal boron nitride used in?
Hexagonal boron nitride can be made use of in the manufacture of TiB2/BN composite ceramics, advanced refractories and superhard products, splitting up rings of horizontal constant rolling steel, high temperature immune lubricants and also heat coverings, along with basic materials for the synthesis of cubic boron nitride.

Particular usages:
1. Boron nitride is a mold launch representative for steel developing and also a lubricant for metal cable illustration.
2. Unique electrolysis and also resistance materials of boron nitride at high temperature.
3. Boron nitride is suitable for heat strong lubricants, extrusion antiwear ingredients, ceramic composite additives, refractories and antioxidant ingredients, especially for molten metal Faustian events, warm improvement ingredients and also heat immune insulation products.
4. Boron nitride is suitable for heat-sealed desiccant of transistor as well as additive of polymer such as plastic material.
5. Boron nitride items pushed right into numerous shapes can be used as high temperature, high stress, insulation and warmth dissipation components.
6. Boron nitride is a thermal securing material in aerospace.
7. With the involvement of driver, cubic boron nitride can be transformed into cubic boron nitride as difficult as ruby by high temperature and high pressure therapy.
8. Boron nitride is the structural material of atomic reactor.
9. Boron nitride is suitable for the nozzles of aircraft and also rocket engines.
10. Boron nitride is an insulator of high voltage, high frequency electricity as well as plasma arc.
11. Boron nitride is a product packaging material to avoid neutron radiation.
12. The superhard product made from boron nitride can be made right into high-speed cutting devices and also drills for geological exploration and also oil boring.
13. Boron nitride is used in metallurgy for separation ring of continuous spreading steel, circulation groove of amorphous iron, demoulding representative of continual spreading aluminum (various optical glass removing agents).
14. Boron nitride is an evaporator for all sort of capacitor film plating, image tube plating, present plating.
15. Boron nitride appropriates for all kinds of fresh-keeping aluminized bags and so forth.
16. Boron nitride is a variety of laser anti-counterfeiting light weight aluminum plating, hallmark gilding products, all sort of cigarette tags, beer tags, packaging boxes, cigarette boxes.
17. Boron nitride appropriates for cosmetics. Can be made use of for lipstick fillers, safe as well as lubricating, but likewise shiny.

Boron Nitride Rate
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