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Characteristics And Application of Boron Carbide

wallpapers Innovations 2020-02-04

Boron carbide is widely used in refractories, engineering ceramics, nuclear  industry, aerospace, and different fields because of its excessive melting  factor, high hardness, low density, and terrific neutron absorption and chemical  resistance.
 

1. Crystal shape of boron carbide

Complex crystal structure of boron carbide with typical icosahedral boride.  The stoichiometric formulation is B4C.
 

There are many isomers in B4C and boron carbide; the carbon content is from  eight% to twenty%. The most stable boron carbide structure is b13c2, b13c3, B4C  with rhombohedral structure, and different stages near b13c3. There are 12  icosahedral clusters inside the hexagonal shape of boron carbide, which can be  related by using a covalent bond and have a three atom chain at the diagonal of  the hexagonal. The dodecahedral shape of the boron is positioned at the apex of  the rhombohedron.
 

Boron and carbon atoms can update each other on the icosahedron and atomic  chain, that is the principle reason why boron carbide has so many isomers. due  to its unique shape, boron carbide has many first-rate bodily and mechanical  properties.

 


 

2. traits of boron carbide
 

2.1 Hardness of boron carbide

The most essential performance of boron carbide lies in its extraordinary  hardness (Mohs 9.3, microhardness 55gpa-67gpa), which is an excellent  excessive-temperature put on-resistant material. therefore, boron carbide,  additionally referred to as black diamond, is one of the three hardest  substances acknowledged (the other two are the diamond and the cubic boron  nitride), which is used in tank armor, bulletproof garb and plenty of industrial  packages.
 

But, is boron carbide harder than a diamond?
 

The solution isn't any. Boron carbide isn't any tougher than diamond. As a  tough black glossy crystal, boron carbide has a decrease hardness than  industrial diamond, however better hardness than silicon carbide. that is to  mention, and boron carbide is the 5th toughest material acknowledged after boron  nitride, diamond, fullerene compound, and diamond whole fiber tube.
 

2.2 Density of boron carbide

Boron carbide's theoretical density is two.52g/cm3,and relative density is  (d204) 2.508 ~ 2.512.
 

it's miles the lightest ceramic material with minimum density and may be used  in the aerospace field.
 

2.3 Chemical homes of boron carbide

Boron carbide has extraordinary chemical homes. It does no longer react with  acids, bases, and maximum inorganic compounds at room temperature. It only  erodes slowly inside the aggregate of hydrofluoric acid, sulfuric acid, and  hydrofluoric acid, nitric acid. it's miles one of the compounds with the most  solid chemical homes.
 

2.4 different residences of boron carbide

Compared with the natural factors B and CD, boron carbide has the benefits of  low value, first rate corrosion resistance, and thermal stability, and is widely  used inside the nuclear industry;
 

Boron carbide additionally has the advantages of excessive melting point,  high elastic modulus, low enlargement coefficient, and useful oxygen absorption  capacity;
 

Boron carbide is likewise a p-type semiconductor cloth, that may keep the  semiconductor traits even at a completely excessive temperature.
 

3. The application of boron carbide
 

Nozzle cloth

The awesome hardness and exceptional wear resistance of boron carbide make it  a essential nozzle material. The boron carbide nozzle has the advantages of long  lifestyles, distinctly low cost, time-saving, and high performance.
 

Neutron absorption and radiation protection materials

element B has a neutron absorption cross-phase of as much as 600 barn, that's  the number one cloth for the discount element control rod or radiation  protection part of the nuclear reactor.

 


 

Composite armor cloth

It is able to be used as a light bulletproof vest and armor cloth by way of  its light, extremely good hard, and excessive modulus. The bulletproof vest  product of boron carbide is more than 50% lighter than that product of the  identical steel. Boron carbide is likewise a critical bulletproof armor cloth  for armored land motors, armed helicopters, and civil aviation airliners.
 

Semiconductor industrial components and thermoelectric additives

Boron carbide ceramics have semiconductor traits and higher thermal  conductivity, which can be used as excessive-temperature semiconductor  components, as well as fuel distribution plate, focusing ring, microwave, or  infrared window, DC plug, and many others. inside the semiconductor industry.  The mixture of B4C and C can be used as a excessive-temperature thermocouple  detail, with the running temperature as much as 2300 ℃, and additionally as a  radiation-resistant thermoelectric detail;
 

Abrasives

The excessive hardness of B4C makes it an awesome put on-resistant cloth or  antifriction fabric. Boron carbide is used rather than diamond abrasives in the  sharpening, precision grinding or grinding procedure of cemented carbide and  engineering ceramics, that can notably lessen the cost of grinding process.
 

The B4C coating can also be covered on the substrate to form a shielding  movie and improve the wear and tear resistance of the substrate. for example,  applying a B4C layer at the equipment surface of the gearbox can correctly  improve the wear resistance of equipment and enhance the service life of the  device.
 

other applications

As an instance, within the area of refractories, boron carbide is used as an  antioxidant, particularly in low-carbon magnesia carbon bricks and  castables.
 

Boron carbide plays an important position in aerospace, country wide defense,  nuclear strength, and put on-resistant technology because of its notable  performance. The practise methods include the carbothermal reduction method,  self-propagating thermal reduction technique, mechanochemical approach, direct  synthesis technique, sol-gel technique, and so forth.
 

At present, the principle problem hindering the application and  popularization of boron carbide lies inside the excessive value of education,  and the excessive sintering temperature and vulnerable oxidation resistance of  boron carbide itself.



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