Boron Nitride Properties

Boron nitride is a crystal composed of nitrogen atoms as well as boron atoms. The crystal structure is divided right into hexagonal boron nitride (HBN), very closely jam-packed hexagonal boron nitride (WBN) as well as cubic boron nitride.

The crystal structure of hexagonal boron nitride has a similar graphite layered framework, revealing a loose, lubricating, moisture-absorbing, light and also various other homes of white powder, so it is additionally called "white graphite". Theoretical density 2.27 g/cm3, certain gravity: 2.43, Mohr hardness = 2.
Hexagonal boron nitride has great electrical insulation, thermal conductivity, chemical security, no obvious melting factor, 3000 ℃ in 0.1 MPA nitrogen, warm resistance to 2000 ℃ in neutral reduction atmosphere, 2800 ℃ in nitrogen and argon, bad stability in oxygen atmosphere, and also temperature below 1000 ℃. The development coefficient of hexagonal boron nitride amounts that of quartz, however its thermal conductivity is ten times that of quartz.
Hexagonal boron nitride does not dissolve cold water. When the water is boiled, it hydrolyses very gradually and also generates a percentage of boric acid and also ammonia, which does not react with weak acid and also strong base at space temperature level. It is a little soluble in warm acid and can only be disintegrated with liquified sodium hydroxide as well as potassium hydroxide.

Boron Nitride Characteristics
1. High warm resistance: sublimation at 3000 ℃, its toughness at 1800 ℃ is twice that at space temperature, air-cooled at 1500 ℃ to space temperature level for loads 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, as well as 33W/M. K has the highest possible thermal conductivity among ceramic materials above 530C.
3, reduced thermal growth coefficient: the growth coefficient of 2 × & times; 10-6 is 2nd just to quartz glass, which is the tiniest in porcelains, coupled with its high thermal conductivity, so the thermal shock resistance is excellent.
4. Outstanding electric residential properties: excellent insulation at high temperature, 1014 Ω& Omega;- centimeters,2000 at 25 ℃ as well as 103 Ω& Omega;- centimeters at 25 ℃. It is the most effective heat protecting product in porcelains, with break down voltage 3KV/MV, reduced dielectric loss 108HZ 2.5 × & times; 10-4, dielectric constant 4, transparent to microwave and infrared.
5. Good corrosion resistance: it does not react with basic steels (iron, copper, aluminum, lead, etc), uncommon earth metals, rare-earth elements, semiconductor materials (germanium, silicon, potassium arsenide), glass, liquified salts (crystal, fluoride, slag), not natural acid and also antacid.
6. Reduced rubbing coefficient: U is 0.16, does not boost at heat, is a lot more immune to high temperature than molybdenum disulfide as well as graphite, oxidation ambience can be used up to 900C, vacuum cleaner can be made use of at 2000 ℃.
7. High purity excellent B is high: its contamination material is less than 10PPM, however B content is more than 43.6%.
8. Machinability: its firmness is Morse 2, so it can be refined right into parts with high precision by general machining approaches.

What is hexagonal boron nitride made use of in?
Hexagonal boron nitride can be used in the manufacture of TiB2/BN composite ceramics, advanced refractories as well as superhard materials, separation rings of straight continual rolling steel, high temperature resistant lubricating substances and also high temperature finishes, in addition to resources for the synthesis of cubic boron nitride.

Details uses:
1. Boron nitride is a mold and mildew release agent for metal forming and a lubricating substance for steel cable drawing.
2. Unique electrolysis as well as resistance materials of boron nitride at heat.
3. Boron nitride appropriates for heat strong lubricants, extrusion antiwear additives, ceramic composite additives, refractories as well as antioxidant additives, specifically for molten steel Faustian events, heat improvement ingredients and heat immune 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 items pressed into numerous forms can be utilized as heat, high pressure, insulation as well as warmth dissipation elements.
6. Boron nitride is a thermal protecting material in aerospace.
7. With the participation of stimulant, cubic boron nitride can be transformed right into cubic boron nitride as difficult 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 aircraft as well as rocket engines.
10. Boron nitride is an insulator of high voltage, high frequency power as well as plasma arc.
11. Boron nitride is a packaging product to stop neutron radiation.
12. The superhard material made from boron nitride can be made right into high-speed cutting tools and also drills for geological expedition and also oil exploration.
13. Boron nitride is used in metallurgy for separation ring of continuous casting steel, flow groove of amorphous iron, demoulding agent of continuous spreading aluminum (various optical glass stripping agents).
14. Boron nitride is an evaporator for all sort of capacitor film plating, photo tube plating, show plating.
15. Boron nitride is suitable for all kinds of fresh-keeping aluminized bags and so on.
16. Boron nitride is a range of laser anti-counterfeiting aluminum plating, hallmark gilding products, all type of cigarette labels, beer tags, product packaging boxes, cigarette boxes.
17. Boron nitride appropriates for cosmetics. Can be made use of for lipstick fillers, non-toxic and also lubricating, however additionally shiny.

Boron Nitride Rate
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