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Superhard Ceramic Diantimony Trioxide , Boron Carbide Abrasion Resistant Material

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Superhard Ceramic Diantimony Trioxide , Boron Carbide Abrasion Resistant Material

Country/Region china
City & Province wuhan hubei
Categories Adhesives & Sealants

Product Details

Superhard Ceramic Boron Carbide,Abrasion Resistant Material Refractory Material

 

Product Name:Boron carbide
Synonyms:B4-C;Boron carbide (B4C);boroncarbide(b4c);Tetrabor;B4C HD 07;B4C HD 15;B4C HD 20;B4C HP
CAS:12069-32-8
MF:CB4
MW:55.25
EINECS:235-111-5
Product Categories:Inorganics;metal borides and carbides
Mol File:12069-32-8.mol
Boron carbide Structure
 
Boron carbide Chemical Properties
Melting point2450°C
Boiling point3500°C
density2.51 g/mL at 25 °C(lit.)
formpowder
colorBlack
Water SolubilityInsoluble in water.
Merck14,1344
Stability:Stable. Incompatible with oxidizing agents. Not flammable.
CAS DataBase Reference12069-32-8(CAS DataBase Reference)
NIST Chemistry ReferenceBoron carbide(12069-32-8)
EPA Substance Registry SystemBoron carbide (B4C)(12069-32-8)
 
Safety Information
Hazard CodesXn
Risk Statements20
Safety Statements22-36/37/39-38
WGK Germany3
RTECSED7420000
TSCAYes
HS Code28499010
 
MSDS Information
ProviderLanguage
Carbon tetraborideEnglish
SigmaAldrichEnglish
ALFAEnglish
 
Boron carbide Usage And Synthesis
Physical and chemical propertiesBoron carbide is black crystal with metallic luster, hardness ranks only second to diamond, higher than silicon carbide, Mohs hardness is 9.3. Chemical property is stable, it does not react with the acid solution, the formula is B4C, relative density is 2.52, melting point is 2350℃, boiling point is higher than 3500℃. The melt boron carbide can dissolve in a large amount of boron carbide graphitic carbon. Boron carbide is stable in dilute acid solution, the mixed acid of sulfuric acid and hydrofluoric acid, the mixed acid of sulfuric acid and nitric acid can decompose boron carbide. When heated to 1000℃, it is slowly oxidized to carbon dioxide and boron oxide in oxygen. Boron carbide has high thermal neutron capture capability, it is wear-resisting, it has semiconducting properties. In most cases, because boron carbide (of B4C) is used as control materials, it can meet the requirements of high-temperature reactors. Increasing the concentration of B10 in the boron carbide can improve the control efficiency of boron material. Boron carbide has a density of 2.51 × 103kg/m3, melting point is 2450 ℃, the thermal expansion coefficient (20~800 ℃) is 4.5 × 10-6/℃.
Figure 1 is the molecular structure of boron carbide.
Industrial boron carbide is mainly produced by methods of melting boron oxide in an electric arc furnace, and reacts with carbon can generat boron carbide. It can also obtained by carbon magnesium reduction method or hydrocarbon reduction method. Boron carbide is mainly used as abrasive, for grinding and polishing of industrial use.
Boron carbide is usually prepared by boric oxide and carbon in an electric furnace by high temperature heating. Reaction is as follows: 2B2O3 + 7C → B4C + 6CO.
Product quality general requires for grains with B4C is not less than 94%, milling class is not less than 90%.
Boron carbide is mainly used for grinding, milling, drilling and polishing of cemented carbide, precious stones and other hard materials. Moldings can be used for wear-resistant material, refractory material, used in the manufacture of hard resistant and corrosion-resistant ceramic water-resistant bearings, it is used as neutron control rods of nuclear reactor, it is also used for smelting boron steel, boron alloys and special welding. Alloy of boron carbide and aluminum (containing up to 50% B4C) is used for neutron shielding, reacting furnace screen cover and so on.
Boron carbide is packed in plastic bags, stored in a dry, clean warehouse.
More information is edited by Chemicalbook Xiaonan (2016-12-03).
Boron carbide ceramicsBoron carbide ceramics is a class of ceramics which the main chemical ingredient is boron carbide. The chemical formula of boron carbide is B4C, it belongs to hexagonal diamond crystal, there are 12 boron atoms in the unit cell, lattice parameter co = 1.212nm, ao = 0. 56nm. Crystal structure exists atom which can accommodate up to 0.18nm diameter, so it can remain the lithium or helium atoms within the crystal structure. Synthesis of boron carbide powder is mainly used carbon thermal reduction method, except the direct reduction with boron anhydride, it can also obtained in the presence of carbon (C), boron anhydride is reduced by Mg, the reaction is: 2B2O3 + 6Mg + C → B4C + 6MgO, the reaction temperature is 1000~1200 ℃. This reaction is highly exothermic, the final product requires H2SO4 or HCl acid pickling, then be washed with hot water to obtain more pure and fine grain size (0.1~5μm), no C boron carbide powder. Boron carbide ceramic is main hot pressing, hot isostatic pressing and non-pressure sintering is also used. Hot press sintering temperature is 2000~2100 ℃, generally Mg, Al, Cr, Si, Ti or a metal such as Al2O3, MgO, etc. or an oxide glass is added to use as sintering aid. The melting point of boron carbide is 2450 ℃, the theoretical density is 2.519g/cm3, elastic modulus is 360~460GPa, the thermal expansion coefficient is 5.73 × 10-6/K (300~1970K), the thermal conductivity at 200 ℃ is 24W/( m • K), hardness is 4950kg/mm2, just below the diamond and cubic boron nitride, it has a large thermal neutron capture cross-section. It is used to process precious stones, ceramics, molds, tools and bearings. It is also used as nozzles, bulletproof materials and nuclear reactor neutron absorber.
Uses
IndustryApplicationRole/benefit
Nuclear reactionControl of nuclear fissionThermal-neutron absorber/absorbs a large number of neutrons and dose not form any radioactive isotopes
Wear applicationsGrinding, milling, drilling and polishing of gemstone, cemented carbide, etc.Abrasives/high hardness and wear resistance
NozzlesHigh-pressure water jet cutter nozzles and grit blasting nozzlesHigh hardness and good presure, temperature and wear resistance
MedicineBoron neutron capture therapy for brain cancerNeutron absorber/absorbs neutrons without forming radioactive isotopes
CoatingsCeramic coating of warships and helicopterCoating material/light weight and good resistance to piercing shell
Scratch and wear resistant coatingsCoating material/high hardness and wear resistance
Chemical manufactureManufacturing of metal boron compoundsSource of boron
OthersCutting tools and diesHigh hardness and wear resistance
Brake linings of vehiclesAdditive/increases the hardness and wear resistance of linings
Inner plates of ballistic vestsLight weight and good resistance to bullet
 
Uses(1) Powder is used as abrasive material, the molded article can be used for wear-resistant material, also used for nuclear reactor.
(2) It is used for grinding carbide, precious stones and other hard materials, grinding, drilling and polishing, metal boride manufacturing and smelting boron steel, boron alloys and special welding.
References1.https://www.azonano.com/article.aspx?ArticleID=3328
2.http://www.dynacer.com/materials/boron-carbide/
3.http://www.sciencedirect.com/science/article/pii/S0969804305003118
4.https://en.wikipedia.org/wiki/Boron_carbide#Uses
5.https://www.chemicalbook.com/ProductChemicalPropertiesCB6315643.htm
6.https://baike.baidu.com/item/%E7%A2%B3%E5%8C%96%E7%A1%BC/2363107?fr=aladdin
DescriptionSodium tetraborate decahydrate/borax (anhydrous) is a clear, colorless or pale yellow hygroscopic substance with a faint odor of detergent. It is stable and is incompatible with powdered metalsand slightly soluble in water. It is extensively used in the industrial manufacturing of metallurgical fluxes, fiberglass, ceramics, fertilizers, enamels, heat-resistant glass (e.g., Pyrex), and other chemicals. It decomposes on heating or on burning producing toxic fumes including sodium oxide, reacts with strong oxidants, and in fire gives off irritating or toxic fumes (or gases).
UsesAbrasive. In the manufacture of hard and chemicals-resistant ceramics or wear-resistant tools. Finely pulverized B4C can be molded under (considerable) pressure and heat.

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