Boron nitride is a crystal composed of nitrogen atoms and also boron atoms. The crystal structure is divided right into hexagonal boron nitride (HBN), very closely packed hexagonal boron nitride (WBN) and cubic boron nitride.
The crystal framework of hexagonal boron nitride has a comparable graphite layered structure, revealing a loosened, lubricating, moisture-absorbing, light and also various other residential properties of white powder, so it is additionally called "white graphite". Theoretical density 2.27 g/cm3, details gravity: 2.43, Mohr solidity = 2.
Hexagonal boron nitride has excellent electrical insulation, thermal conductivity, chemical stability, no evident melting factor, 3000 ℃ in 0.1 MPA nitrogen, warmth resistance to 2000 ℃ in neutral reduction atmosphere, 2800 ℃ in nitrogen as well as argon, bad stability in oxygen environment, and temperature listed below 1000 ℃. The growth coefficient of hexagonal boron nitride amounts that of quartz, but its thermal conductivity is ten times that of quartz.
Hexagonal boron nitride does not liquify chilly water. When the water is boiled, it hydrolyses very slowly as well as creates a percentage of boric acid as well as ammonia, which does not react with weak acid and also strong base at space temperature. It is somewhat soluble in warm acid and also can only be decayed with liquified sodium hydroxide as well as potassium hydroxide.
Boron Nitride Residences
1. High heat resistance: sublimation at 3000 ℃, its stamina at 1800 ℃ is twice that at room temperature level, air-cooled at 1500 ℃ to space temperature for dozens of times, as well as does not soften at 2800 ℃ in inert gas.
2. High thermal conductivity: the hot-pressed items coincide as pure iron, as well as 33W/M. K has the highest thermal conductivity among ceramic materials above 530C.
3, reduced thermal growth coefficient: the expansion coefficient of 2 × & times; 10-6 is second only to quartz glass, which is the tiniest in ceramics, combined with its high thermal conductivity, so the thermal shock resistance is great.
4. Exceptional electrical residential 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 best high temperature insulating material in ceramics, with failure voltage 3KV/MV, reduced dielectric loss 108HZ 2.5 × & times; 10-4, dielectric constant 4, transparent to microwave and also infrared.
5. Good corrosion resistance: it does not respond with general steels (iron, copper, light weight aluminum, lead, and so on), uncommon planet metals, precious metals, semiconductor materials (germanium, silicon, potassium arsenide), glass, liquified salts (crystal, fluoride, slag), inorganic acid and antacid.
6. Reduced rubbing coefficient: U is 0.16, does not increase at high temperature, is a lot more resistant to heat than molybdenum disulfide and graphite, oxidation environment can be used up to 900C, vacuum cleaner can be made use of at 2000 ℃.
7. High purity excellent B is high: its impurity content is less than 10PPM, but B web content is greater than 43.6%.
8. Machinability: its firmness is Morse 2, so it can be processed right into get rid of high precision by general machining techniques.
What is hexagonal boron nitride utilized in?
Hexagonal boron nitride can be utilized in the manufacture of TiB2/BN composite ceramics, progressed refractories and also superhard materials, splitting up rings of straight constant rolling steel, heat resistant lubricants and also heat layers, in addition to raw materials for the synthesis of cubic boron nitride.
1. Boron nitride is a mold and mildew launch representative for metal forming and also a lubricating substance for metal cord drawing.
2. Unique electrolysis and resistance materials of boron nitride at heat.
3. Boron nitride appropriates for high temperature solid lubricating substances, extrusion antiwear ingredients, ceramic composite additives, refractories and antioxidant additives, especially for molten steel Faustian celebrations, warm improvement additives and also heat immune insulation products.
4. Boron nitride appropriates for heat-sealed desiccant of transistor and also additive of polymer such as plastic resin.
5. Boron nitride items pushed into numerous forms can be made use of as heat, high stress, insulation and warm dissipation parts.
6. Boron nitride is a thermal protecting product in aerospace.
7. With the engagement of driver, cubic boron nitride can be transformed right into cubic boron nitride as tough as diamond by heat as well as high pressure treatment.
8. Boron nitride is the structural material of atomic activator.
9. Boron nitride appropriates for the nozzles of aircraft as well as rocket engines.
10. Boron nitride is an insulator of high voltage, high regularity electrical energy as well as plasma arc.
11. Boron nitride is a packaging product 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 as well as oil drilling.
13. Boron nitride is utilized in metallurgy for separation ring of continual casting steel, circulation groove of amorphous iron, demoulding representative of continual spreading aluminum (different optical glass removing agents).
14. Boron nitride is an evaporator for all type of capacitor movie plating, image tube plating, show plating.
15. Boron nitride is suitable for all type of fresh-keeping aluminized bags and so on.
16. Boron nitride is a variety of laser anti-counterfeiting aluminum plating, trademark gilding materials, all type of cigarette tags, beer labels, product packaging boxes, cigarette boxes.
17. Boron nitride is suitable for cosmetics. Can be made use of for lipstick fillers, safe as well as lubricating, however additionally glossy.
Boron Nitride Cost
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