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Boron Carbide

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Boron carbide

Alias black diamond, formula for ₄ C, B is usually colored powder. It is one of the three hardest materials known (the other two are diamond and cubic boron nitride) and is used in tank armour, bulletproof suits and many industrial applications. It has a moo hardness of 9.3

It was discovered as a byproduct of boride research in the 19th century and was not studied scientifically until the 1930s. Boron carbide can be made by reducing boron trioxide with carbon in an electric furnace.

Boron carbide can absorb large amounts of neutrons without forming any radioactive isotopes, So it is an ideal neutron absorber in nuclear power plants, Which mainly control the rate of nuclear fission. Boron carbide is mostly made into a controlled rod at the nuclear reactor site, But it is sometimes powdered to increase surface area.

It has the characteristics of low density, High strength, High temperature stability and good chemical stability. It is used in wear-resistant materials, Ceramic reinforced phase, Especially in light armor, Reactor neutron absorbent, Etc. In addition, Compared with diamond and cubic boron nitride, Boron carbide is easy and cheap to manufacture, So it is more widely used and can replace expensive diamond in some places, Which is commonly used in grinding, Grinding and drilling.

中文名  :   碳化硼

Control information  : This product is not controlled

English names: Boroncarbide,Tetraboroncarbide

Alias: Boron monocarbide

 

Nature of the: Low density, high strength and high temperature stability

Chemical formula

B4C,

Relative molecular mass

55.26

Character:

Hard black shiny crystal. Hardness is lower than industrial diamond, But higher than silicon carbide. Compared with most pottery, It is less fragile. It has a large thermal neutron capture cross section. Strong chemical resistance. Resistant to hot hydrogen fluoride and nitric acid. Soluble in molten base, insoluble in water and acids. Relative density (d204)2.508 ~ 2.512. Melting point is 2350 ℃. The boiling point of 3500 ℃.

Use

Anti - Chemical pottery, Wear - Resistant tools manufacturing.

Quality control program

Project index values

Content (B4C)

≥90.0%

Total amount of free carbon, boron trioxide and other impurities

≤10.0%

The physical and chemical constant

Alias

B4-c, B4C, black diamond, tetraboron carbide

CAS

12069-32-8

Chemical formula

B4C

Molar mass

55.255 g mol

Appearance

Black powder

The Density of

2.52 g/cm 

Melting point

2350 °C (2623.15 K)

The boiling point

>3500 °C (>3773.15 K)


In the water

solubility

Do not dissolve

The crystal structure

Ling party

The main danger

Harmful, Irritating

Physicochemical properties

It does not react with acid and alkali solutions and has high chemical potential, neutron absorption, Abrasion resistance and semiconductor conductivity. Is one of the most acid stable substances, Stable in all concentrated or dilute acid or alkali solutions. Boron carbide is basically stable under 800℃ in the air environment. Due to the gas phase loss of boron oxide formed by its oxidation at a higher temperature, It becomes unstable and forms carbon dioxide and boron trioxide.

When some transition metals and their carbides coexist, They have special stability. Elements at 1000 ~ 1100℃ .At the appropriate temperature, it is reported that boron carbide is easy to nitride or react with transition metal oxides to form corresponding boron nitride,Period of the first in the table Ⅳ, Ⅴ and Ⅵ transition metal and strong reaction to form metal boride boron carbide powder. However, In higher inversion.And borides, Which are mostly rare earth and alkaline earth metals called hexabroborides.

When sodium hydroxide,Potassium hydroxide, Sodium carbonate, Potassium carbonate melt, Boron carbide easy decomposition, And the content of boron determination.

t has a mohs hardness of 9.3 And is the third hardest substance known after diamond and boron nitride. (lower than silicon carbide 9.5)

Due to the preparation method, Boron carbide is easy to form carbon defects, Which leads to the b/c ratio changes in a large range without affecting its crystal structure, which often leads to the reduction of its physical and chemical properties. This defect is often difficult to be resolved by powder diffraction and often requires chemical titration and energy loss spectrum determination.

Application

Boron carbide absorbs large amounts of neutrons without forming any radioactive isotopes, Making it an ideal neutron absorber for nuclear power plants, Which mainly control the rate of nuclear fission. Boron carbide is mostly made into a controlled rod at the nuclear reactor site, but it is sometimes powdered to increase surface area.

Abrasive materials

Because boron carbide has long been used as a coarse abrasive material. Due to its high melting point, It is not easy to cast into artefact, But by melting powder at high temperature, it can be processed into simple shapes. Used for grinding, grinding, Drilling and polishing hard materials such as hard alloy and gem.

Coating paint

Boron carbide can also be used as a ceramic coating for warships and helicopters. It is light weight and has the ability to resist penetrators penetrating the thermal pressure coating to form an integral protective layer.

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