Boron nitride is a crystal composed of nitrogen atoms as well as boron atoms. The crystal structure is split into hexagonal boron nitride (HBN), carefully stuffed hexagonal boron nitride (WBN) as well as cubic boron nitride.
The crystal structure of hexagonal boron nitride has a comparable graphite split framework, revealing a loose, lubricating, moisture-absorbing, light and also various other buildings of white powder, so it is also called "white graphite". Academic thickness 2.27 g/cm3, certain gravity: 2.43, Mohr firmness = 2.
Hexagonal boron nitride has excellent electric insulation, thermal conductivity, chemical security, no noticeable melting point, 3000 ℃ in 0.1 MPA nitrogen, warm resistance to 2000 ℃ in neutral reduction environment, 2800 ℃ in nitrogen and also argon, bad stability in oxygen atmosphere, as well as 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 dissolve cold water. When the water is steamed, it hydrolyses very slowly and also generates a percentage of boric acid as well as ammonia, which does not respond with weak acid as well as strong base at room temperature. It is somewhat soluble in warm acid and also can only be disintegrated with molten sodium hydroxide and also potassium hydroxide.
Boron Nitride Qualities
1. High heat resistance: sublimation at 3000 ℃, its strength at 1800 ℃ is two times that at area temperature level, air-cooled at 1500 ℃ to space temperature for lots of times, as well as does not soften at 2800 ℃ in inert gas.
2. High thermal conductivity: the hot-pressed products coincide as pure iron, as well as 33W/M. K has the highest thermal conductivity among ceramic materials over 530C.
3, low thermal expansion coefficient: the growth coefficient of 2 × & times; 10-6 is second only to quartz glass, which is the smallest in ceramics, coupled with its high thermal conductivity, so the thermal shock resistance is very good.
4. Outstanding electric residential properties: good insulation at high temperature, 1014 Ω& Omega;- cm,2000 at 25 ℃ and also 103 Ω& Omega;- centimeters at 25 ℃. It is the very best high temperature protecting product in ceramics, with malfunction voltage 3KV/MV, reduced dielectric loss 108HZ 2.5 × & times; 10-4, dielectric continuous 4, transparent to microwave and infrared.
5. Good deterioration resistance: it does not respond with general steels (iron, copper, aluminum, lead, etc), rare earth steels, precious metals, semiconductor materials (germanium, silicon, potassium arsenide), glass, molten salts (crystal, fluoride, slag), not natural acid and also alkali.
6. Low rubbing coefficient: U is 0.16, does not enhance at high temperature, is a lot more resistant to heat than molybdenum disulfide and graphite, oxidation ambience can be used up to 900C, vacuum cleaner can be made use of at 2000 ℃.
7. High purity good B is high: its contamination web content is much less than 10PPM, yet B content is greater than 43.6%.
8. Machinability: its hardness is Morse 2, so it can be processed into parts with high precision by basic machining approaches.
What is hexagonal boron nitride utilized in?
Hexagonal boron nitride can be used in the manufacture of TiB2/BN composite ceramics, advanced refractories and superhard materials, separation rings of straight continual rolling steel, heat immune lubricating substances as well as high temperature finishes, in addition to basic materials for the synthesis of cubic boron nitride.
1. Boron nitride is a mold and mildew launch representative for steel creating and a lube for metal cord illustration.
2. Special electrolysis as well as resistance products of boron nitride at heat.
3. Boron nitride appropriates for heat solid lubricating substances, extrusion antiwear ingredients, ceramic composite ingredients, refractories and antioxidant ingredients, specifically for liquified metal Faustian events, warm improvement additives and heat immune insulation products.
4. Boron nitride appropriates for heat-sealed desiccant of transistor and also additive of polymer such as plastic material.
5. Boron nitride items pushed into numerous shapes can be used as high temperature, high stress, insulation and heat dissipation parts.
6. Boron nitride is a thermal protecting material in aerospace.
7. With the participation of stimulant, cubic boron nitride can be changed into cubic boron nitride as difficult as diamond by high temperature as well as high stress treatment.
8. Boron nitride is the architectural material of atomic activator.
9. Boron nitride appropriates for the nozzles of airplane as well as rocket engines.
10. Boron nitride is an insulator of high voltage, high frequency electricity as well as plasma arc.
11. Boron nitride is a packaging material to stop neutron radiation.
12. The superhard material made from boron nitride can be made into high-speed cutting devices and drills for geological expedition and oil drilling.
13. Boron nitride is utilized in metallurgy for separation ring of continuous casting steel, flow groove of amorphous iron, demoulding representative of continuous casting light weight aluminum (different optical glass removing agents).
14. Boron nitride is an evaporator for all sort of capacitor movie plating, picture tube plating, present plating.
15. Boron nitride appropriates for all type of fresh-keeping aluminized bags and so on.
16. Boron nitride is a range of laser anti-counterfeiting aluminum plating, trademark gilding products, all kinds of cigarette labels, beer tags, product packaging boxes, cigarette boxes.
17. Boron nitride is suitable for cosmetics. Can be utilized for lipstick fillers, non-toxic and lubricating, but additionally glossy.
Boron Nitride Price
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