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Boron carbide

Physical and chemical properties Boron carbide ceramics Uses Uses References
Boron carbide
Boron carbide structure
Chemical Name:
Boron carbide
B4-C;B4C HS;B4C HP;Norbide;Tetrabor;B4C HD 20;B4C HD 15;B4C HD 07;BORON CARBIDE;Denkaboron 1200
Molecular Formula:
Formula Weight:
MOL File:

Boron carbide Properties

Melting point:
Boiling point:
2.51 g/mL at 25 °C(lit.)
Specific Gravity
Water Solubility 
Insoluble in water.
Stable. Incompatible with oxidizing agents. Not flammable.
CAS DataBase Reference
12069-32-8(CAS DataBase Reference)
NIST Chemistry Reference
Boron carbide(12069-32-8)
EPA Substance Registry System
Boron carbide (B4C)(12069-32-8)
  • Risk and Safety Statements
Hazard statements  H315-H319-H332-H335
Precautionary statements  P261-P280a-P304+P340-P305+P351+P338-P405-P501a
Hazard Codes  Xn
Risk Statements  20
Safety Statements  22-36/37/39-38
WGK Germany  3
RTECS  ED7420000
HS Code  28499010

Boron carbide price More Price(16)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 378100 Boron carbide powder, 200 mesh, 98% 12069-32-8 100g $56.5 2018-11-13 Buy
Sigma-Aldrich 378119 Boron carbide powder, <10 μm, 98% 12069-32-8 50g $75 2018-11-13 Buy
Alfa Aesar 010922 Boron carbide, 90+% 12069-32-8 100g $43.2 2018-11-16 Buy
Alfa Aesar 010922 Boron carbide, 90+% 12069-32-8 500g $153 2018-11-16 Buy
Strem Chemicals 05-0120 Boron carbide, 0.1-1.5 microns (99.9+%-B) 12069-32-8 500g $392 2018-11-13 Buy

Boron carbide Chemical Properties,Uses,Production

Physical and chemical properties

Boron 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/℃.
molecular structure of boron carbide
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 ceramics

Boron 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.


Nuclear reaction
Control of nuclear fission
Thermal-neutron absorber/absorbs a large number of neutrons and dose not form any radioactive isotopes
Wear applications
Grinding, milling, drilling and polishing of gemstone, cemented carbide, etc.
Abrasives/high hardness and wear resistance
High-pressure water jet cutter nozzles and grit blasting nozzles
High hardness and good presure, temperature and wear resistance
Boron neutron capture therapy for brain cancer
Neutron absorber/absorbs neutrons without forming radioactive isotopes
Ceramic coating of warships and helicopter
Coating material/light weight and good resistance to piercing shell
Scratch and wear resistant coatings
Coating material/high hardness and wear resistance
Chemical manufacture
Manufacturing of metal boron compounds
Source of boron
Cutting tools and dies
High hardness and wear resistance
Brake linings of vehicles
Additive/increases the hardness and wear resistance of linings
Inner plates of ballistic vests
Light weight and good resistance to bullet


(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.




Sodium 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).

Chemical Properties

hard, black, shiny crystal(s), -325 mesh with 99.5% purity; rhomb; hardness 9.3 Mohs; less brittle than most ceramics; does not burn in oxygen flame; used as an abrasive; Knoop hardness ~27GPa; produced by reducing B2O3 with carbon at 1400°C–2300°C; used in crucible form as a container for molten salts except molten caustic and as a 99.5% pure sputtering target for producing semiconductor and wear-resistant films [KIR78] [HAW93] [MER06] [CER91]


Abrasive. In the manufacture of hard and chemicals-resistant ceramics or wear-resistant tools. Finely pulverized B4C can be molded under (considerable) pressure and heat.


Boron carbide (B4C) is a hard, black crystal that is used as an abrasive powder and as an additive to strengthen composite parts in aircraft.


boron carbide: A black solid, B4C,soluble only in fused alkali; it is extremelyhard, over 9? on Mohs’scale; rhombohedral; r.d. 2.52; m.p.2350°C; b.p. >3500°C. Boron carbideis manufactured by the reduction ofboric oxide with petroleum coke inan electric furnace. It is used largelyas an abrasive, but objects can alsobe fabricated using high-temperaturepowder metallurgy. Boron nitride isalso used as a neutron absorber becauseof its high proportion ofboron–10.

Industrial uses

Boron carbide (B4C) is produced by the hightemperature(about 1371 to 2482°C) interactionof boric oxide, B2O3, and carbon in an electricalresistance-type furnace. It is a black, lustroussolid. It is used extensively as an abrasive,because its hardness approaches that of the diamond.It is also used as an alloying agent, particularlyin molybdenum steels.
Additionally, it is used in drawing dies andgauges, or into heat-resistant parts such as nozzles.The composition is either B6C or B4C; theformer is the harder but usually contains anexcess of graphite difficult to separate in thepowder. It can be used thus as a deoxidizingagent for casting copper, and also for lapping,since the graphite acts as a lubricant. Borofluxis B4C with flake graphite, used as a casting flux.B4C parts are fabricated by hot pressing,sintering, and sinter-HIPing (HIP = hot-isostaticpress). Industrially, densification is carriedout by hot pressing (2100 to 2200°C, 20to 40 MPa) in argon. The best properties areobtained when pure fine powder is densifiedwithout additives. Pressureless sintering to highdensity is possible using ultrafine powder, withadditives (notably carbon). Less expensive thanhot pressing, sintering also can be used for morecomplex shapes.
Special part formulations include bondingB4C with fused sodium silicate, borate frits,glasses, plastics, or rubbers to lend strength,hardness, or abrasion resistance. B4C-based cermets and MMC (especially Al/B4C, Mg/B4C, Ti/B4C), and CMCs (e.g., TiB2/B4C) haveunique properties, including superior ballisticperformance, that make these materials suitablefor highly specialized applications. Hightemperaturestrength, light weight, corrosionresistance, and hardness make these compositesespecially attractive. B4C shapes can bereaction-bonded using SiC as the bondingphase. B4C–C mixtures are formed, thenreacted with silicon to create the SiC bond. SiCalso can be used as a sintering aid for B4C, andvice versa.

Boron carbide Preparation Products And Raw materials

Raw materials

Preparation Products

Boron carbide Suppliers

Global( 114)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20672 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32447 55
Shanghai Zheyan Biotech Co., Ltd.
18017610038 CHINA 3623 58
career henan chemical co
+86-371-86658258 CHINA 30001 58
Chemwill Asia Co.,Ltd.
86-21-51861608;;; CHINA 23980 58
Hubei Jusheng Technology Co.,Ltd.
027-59599243 CHINA 28236 58
Haihang Industry Co.,Ltd
+86 531 8582 1093 CHINA 8921 58
Chongqing Chemdad Co., Ltd
+86-13650506873 CHINA 35440 58
Shanghai Aladdin Bio-Chem Technology Co.,LTD 021-20337333/400-620-6333
021-50323701 China 24986 65
Shanghai bike new material technology co., LTD 17317635738
021-34790236 China 285 58

View Lastest Price from Boron carbide manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-12-19 Boron carbide
US $1.00 / kg 1kg 99% Customized career henan chemical co

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