Высококачественное биологическое пятно гематоксилин CAS 517-28-2
US $10.00-$300.00
Поставщик производитель конкурентоспособная цена порошки наномикронного гексагонального
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- Поставщик: Gongyi,Yalv,Material,Co.,Ltd.
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Product Description
Supplier Manufacturer Competitive Price Of Nano Micron Hexagonal Boron Nitride Powders
Supplier Manufacturer Competitive Price Of Nano Micron Hexagonal Boron Nitride Powders
Boron nitride is made up of nitrogen and boron atoms in the crystal, the crystal structure can be divided into: hexagonal boron nitride (HBN) close hexagonal boron nitride (WBN) and cubic boron nitride, the crystal structure of hexagonal boron nitride have similar graphite layers, rendering loose white powder lubrication easy absorption of moisture is qualitative light, traits, say again so white graphite theoretical density of 2.27 g/cm3, specific gravity: 2.43, hardness is 2 monhs. Hexagonal boron nitride has good electrical insulation, thermal conductivity, chemical stability and no obvious melting point. In nitrogen of 0.1 mpa, 3000; in neutral reducing atmosphere, the heat resistance reaches 2000; in nitrogen and argon, the operating temperature can reach 2800; in oxygen atmosphere, the stability is poor, and the operating temperature is below 1000.The expansion coefficient of boron hexahydrate is equivalent to quartz, but the thermal conductivity is less than 10 times that of quartz. When the water is boiled, it hydrolyzes very slowly and produces a small amount of boric acid and ammonia, which cannot react with weak acid and strong alkali at room temperature. It is slightly soluble in hot acid, and can be decomposed only when treated with molten sodium hydroxide and potassium hydroxide.
Specification
Item | Data | |
Purity | >98.5 | >99 |
B2O3 | <1.0 | <0.5 |
Moisture | <0.5 | <0.3 |
Size(D50) | <5micron | <8micron |
App.density | 0.2-0.4 g/cm3 | 0.2-0.4 g/cm3 |
1. high heat resistance: 3000 sublimation, the strength of 1800 for 2 times at room temperature, 1500 air cooling to room temperature is dozens of times not burst, 2800 in inert gas are not soften.
2. high coefficient of thermal conductivity: hot pressing products for 33 w/M.K like pure iron, more than in 530 is one of the largest material .
3. ceramic materials thermal conductivity low thermal expansion coefficient, the coefficient of expansion of 2 10-6 after quartz glass, is the youngest of ceramic, coupled with its high thermal conductivity, therefore thermal shock performance is very good .
4. excellent electric properties: good heat insulation, 25Ω 1014 - cm, can also achieve 103 Ω - 2000 cm, is the best heat insulating material of ceramic, breakdown voltage 3 kv/MV, low dielectric loss 10-108 hz to 2.5 4, dielectric constant of 4, permeable microwave and infrared .
5. good corrosion resistance: with general metal of rare earth metals, precious metals, semi-conductor materials, glass, molten salt does not react with inorganic acid, alkali slag fluoride (crystal) .
6. Low coefficient of friction: U 0.16, high temperature does not increase, molybdenum disulfide, graphite, high temperature resistant, oxidizing atmosphere available to 900, under the vacuum available to 2000 .
7. high purity B: the impurity content is less than 10 PPM, and the B is greater than 43.6% 8 machinability, its hardness is Morse 2, so the available general mechanical processing method processed into parts of high precision products.
Application
It can be used in the manufacture of TiB2/BN composite ceramics, as well as in advanced refractories and superhard materials, separation rings for horizontal continuous rolling steel, high temperature resistant lubricants and high temperature coatings, and as a raw material for the synthesis of cubic boron nitride.
Packing & Delivery
BN Powder is in 1kg per bag, 20kg per barrel or 1 ton in a ton bag.
The pacakge is also can be customized.
The pacakge is also can be customized.
FAQ
Q: Payment term：
A: T/T，Western Union，Money Gram，PayPal，all could be acceptable with discussion.Alibaba assurance order is the best way.
Q: How long is your delivery time?
A: If the size we have storage, could delivery within 3 days. If the size you need haven't storage,production time would be 7-15 days based on our production schedule.
Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.
Q: MOQ:
A: Even 1kg is possible!
Q:Package Information:
A:with 25kg/inner thick plastic bag，further put it into wooden barrel or paper bag or as customer's request。
Q:The nearest port of our factory：
A：Qingdao port！Also could send our products
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