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Boron nitride is a crystal made up of nitrogen atoms and also boron atoms. The crystal framework is split right 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 comparable graphite layered structure, showing a loosened, lubricating, moisture-absorbing, light and also other residential properties of white powder, so it is also called "white graphite". Academic thickness 2.27 g/cm3, specific gravity: 2.43, Mohr hardness = 2.
Hexagonal boron nitride has excellent electric insulation, thermal conductivity, chemical stability, no apparent melting point, 3000 ℃ in 0.1 MPA nitrogen, heat resistance to 2000 ℃ in neutral decrease ambience, 2800 ℃ in nitrogen as well as argon, poor stability in oxygen atmosphere, as well as temperature listed below 1000 ℃. The expansion coefficient of hexagonal boron nitride is equivalent to that of quartz, yet its thermal conductivity is ten times that of quartz.
Hexagonal boron nitride does not liquify cool water. When the water is steamed, it hydrolyses very slowly and also creates a small amount of boric acid and also ammonia, which does not respond with weak acid and solid base at space temperature. It is slightly soluble in warm acid and can just be decomposed with molten salt hydroxide and also potassium hydroxide.
Boron Nitride Qualities
1. High warmth resistance: sublimation at 3000 ℃, its stamina at 1800 ℃ is twice that at space temperature level, air-cooled at 1500 ℃ to area temperature for dozens of times, and also does not soften at 2800 ℃ in inert gas.
2. High thermal conductivity: the hot-pressed products are the same as pure iron, and also 33W/M. K has the greatest thermal conductivity amongst ceramic materials over 530C.
3, reduced thermal expansion coefficient: the development coefficient of 2 × & times; 10-6 is 2nd only to quartz glass, which is the smallest in porcelains, combined with its high thermal conductivity, so the thermal shock resistance is excellent.
4. Outstanding electrical residential properties: good insulation at heat, 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 ceramics, with malfunction voltage 3KV/MV, reduced dielectric loss 108HZ 2.5 × & times; 10-4, dielectric constant 4, transparent to microwave as well as infrared.
5. Good deterioration resistance: it does not react with general steels (iron, copper, light weight aluminum, lead, and so on), rare planet metals, precious metals, semiconductor products (germanium, silicon, potassium arsenide), glass, liquified salts (crystal, fluoride, slag), inorganic acid as well as antacid.
6. Low friction coefficient: U is 0.16, does not raise at heat, is more resistant to heat than molybdenum disulfide as well as graphite, oxidation environment can be consumed to 900C, vacuum can be used at 2000 ℃.
7. High pureness great B is high: its impurity content is less than 10PPM, however B content is more than 43.6%.
8. Machinability: its hardness is Morse 2, so it can be processed into parts with high precision by general machining methods.
What is hexagonal boron nitride made use of in?
Hexagonal boron nitride can be utilized in the manufacture of TiB2/BN composite porcelains, progressed refractories as well as superhard materials, separation rings of straight continuous rolling steel, high temperature immune lubricating substances and also heat layers, in addition to raw materials for the synthesis of cubic boron nitride.
1. Boron nitride is a mold and mildew release agent for steel creating as well as a lube for steel wire drawing.
2. Special electrolysis and resistance products of boron nitride at heat.
3. Boron nitride appropriates for heat strong lubricants, extrusion antiwear ingredients, ceramic composite additives, refractories and antioxidant additives, specifically for molten steel Faustian events, warmth improvement ingredients and also high temperature immune insulation materials.
4. Boron nitride appropriates for heat-sealed desiccant of transistor and additive of polymer such as plastic material.
5. Boron nitride items pushed right into various shapes can be made use of as high temperature, high pressure, insulation and also heat dissipation components.
6. Boron nitride is a thermal shielding product in aerospace.
7. With the participation of stimulant, cubic boron nitride can be transformed into cubic boron nitride as hard as diamond by heat and also high stress treatment.
8. Boron nitride is the structural product of atomic reactor.
9. Boron nitride appropriates for the nozzles of airplane and also rocket engines.
10. Boron nitride is an insulator of high voltage, high regularity electricity and plasma arc.
11. Boron nitride is a packaging product to avoid neutron radiation.
12. The superhard product made from boron nitride can be made right into high-speed cutting tools as well as drills for geological expedition as well as oil exploration.
13. Boron nitride is used in metallurgy for splitting up ring of continuous casting steel, flow groove of amorphous iron, demoulding representative of constant casting aluminum (different optical glass stripping agents).
14. Boron nitride is an evaporator for all kinds of capacitor movie plating, picture tube plating, present plating.
15. Boron nitride appropriates for all kinds of fresh-keeping aluminized bags and so forth.
16. Boron nitride is a range of laser anti-counterfeiting light weight aluminum plating, trademark gilding products, all kinds of cigarette labels, beer tags, packaging boxes, cigarette boxes.
17. Boron nitride is suitable for cosmetics. Can be made use of for lipstick fillers, non-toxic and lubricating, yet likewise shiny.
Boron Nitride Price
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