Boron Nitride Properties

Boron nitride is a crystal composed of nitrogen atoms as well as boron atoms. The crystal framework is separated into hexagonal boron nitride (HBN), carefully stuffed hexagonal boron nitride (WBN) and cubic boron nitride.

The crystal framework of hexagonal boron nitride has a comparable graphite split framework, revealing a loosened, lubricating, moisture-absorbing, light and other buildings of white powder, so it is also called "white graphite". Academic density 2.27 g/cm3, details gravity: 2.43, Mohr solidity = 2.
Hexagonal boron nitride has great electric insulation, thermal conductivity, chemical security, no apparent melting point, 3000 ℃ in 0.1 MPA nitrogen, warmth resistance to 2000 ℃ in neutral reduction environment, 2800 ℃ in nitrogen and also argon, poor stability in oxygen atmosphere, and temperature level listed below 1000 ℃. The expansion 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 cold water. When the water is boiled, it hydrolyses really slowly and creates a percentage of boric acid and ammonia, which does not react with weak acid and also solid base at room temperature. It is somewhat soluble in warm acid and can just be decayed with molten sodium hydroxide and potassium hydroxide.

Boron Nitride Characteristics
1. High heat resistance: sublimation at 3000 ℃, its stamina at 1800 ℃ is two times that at room temperature level, air-cooled at 1500 ℃ to space temperature level for loads of times, and does not soften at 2800 ℃ in inert gas.
2. High thermal conductivity: the hot-pressed items coincide as pure iron, and 33W/M. K has the highest possible thermal conductivity among ceramic materials over 530C.
3, low thermal expansion 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 excellent.
4. Outstanding electric residential or commercial properties: excellent insulation at heat, 1014 Ω& Omega;- centimeters,2000 at 25 ℃ as well as 103 Ω& Omega;- cm at 25 ℃. It is the best heat insulating material in ceramics, with breakdown voltage 3KV/MV, low dielectric loss 108HZ 2.5 × & times; 10-4, dielectric constant 4, transparent to microwave and infrared.
5. Excellent corrosion resistance: it does not respond with basic steels (iron, copper, light weight aluminum, lead, etc), uncommon earth steels, precious metals, semiconductor materials (germanium, silicon, potassium arsenide), glass, molten salts (crystal, fluoride, slag), not natural acid and also antacid.
6. Low friction coefficient: U is 0.16, does not increase at high temperature, is more resistant to high temperature than molybdenum disulfide and also graphite, oxidation ambience can be used up to 900C, vacuum can be made use of at 2000 ℃.
7. High purity excellent B is high: its contamination web content is much less than 10PPM, but B web content is more than 43.6%.
8. Machinability: its hardness is Morse 2, so it can be refined into parts with high precision by basic machining approaches.

What is hexagonal boron nitride utilized in?
Hexagonal boron nitride can be made use of in the manufacture of TiB2/BN composite porcelains, advanced refractories as well as superhard products, splitting up rings of horizontal continuous rolling steel, heat resistant lubricants and heat finishes, in addition to basic materials for the synthesis of cubic boron nitride.

Certain usages:
1. Boron nitride is a mold and mildew release representative for metal forming as well as a lubricating substance for steel cable illustration.
2. Unique electrolysis and resistance products of boron nitride at high temperature.
3. Boron nitride is suitable for high temperature strong lubricants, extrusion antiwear ingredients, ceramic composite additives, refractories and antioxidant additives, especially for molten metal Faustian events, warmth enhancement additives and also high temperature resistant insulation materials.
4. Boron nitride appropriates for heat-sealed desiccant of transistor and also additive of polymer such as plastic resin.
5. Boron nitride products pressed right into various forms can be used as high temperature, high pressure, insulation and also warmth dissipation parts.
6. Boron nitride is a thermal shielding product in aerospace.
7. With the involvement of driver, cubic boron nitride can be transformed into cubic boron nitride as hard as diamond by high temperature and high pressure treatment.
8. Boron nitride is the architectural product of atomic activator.
9. Boron nitride appropriates for the nozzles of airplane and rocket engines.
10. Boron nitride is an insulator of high voltage, high regularity electrical power and plasma arc.
11. Boron nitride is a packaging product to prevent neutron radiation.
12. The superhard material made from boron nitride can be made into high-speed cutting tools and drills for geological expedition and also oil drilling.
13. Boron nitride is used in metallurgy for separation ring of continual spreading steel, flow groove of amorphous iron, demoulding representative of continual spreading light weight aluminum (various optical glass stripping representatives).
14. Boron nitride is an evaporator for all type of capacitor movie plating, picture tube plating, show plating.
15. Boron nitride is suitable for all sort of fresh-keeping aluminized bags and so forth.
16. Boron nitride is a range of laser anti-counterfeiting aluminum plating, hallmark gilding materials, all kinds of cigarette labels, beer labels, product packaging boxes, cigarette boxes.
17. Boron nitride appropriates for cosmetics. Can be made use of for lipstick fillers, non-toxic as well as lubricating, yet additionally shiny.

Boron Nitride Rate
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