Difference between hexagonal and cubic boron nutride
Boron Nitride is a crystal made of nitrogen and boron. With four variants of the chemical composition: cubic boron nutride (CBN), hexagonal boron (HBN), rhombohedral (RBN), cubic (CBN) and wurtzite boron Boron (WBN), 43.6% is boron, 56.4% nitrogen. It is also known as the cubic crystal variation (an alternate form of wurtzite, boron nitride), and it is one of the most hard substances. It’s widely used for the manufacturing of alloys, high temperature resistant materials, semiconductors and nuclear reactors.
1. Hexagonal Boron NItride
Hexagonalboron Nitride (H-BN), commonly known as white graphene, is a 2-dimensional material. It has a monoatomic layer made of nitrogen and boron elements alternately. This layered arrangement, AA’AA ‘……type is similar to graphene. It also shares many of the same properties as graphene.
Hexagonal boron nitride (H-BN) is a graphite lattice, which is in the form of a loose, lubricating, moisture-absorbing, light-weight, insoluble, high-temperature-resistant white powder. Hexagonalboron nitride does not have an obvious melting point. This metal has excellent chemical resistance properties and will not react to general metals as well as rare and precious metals.
Hexagonalboron nitride, a high-quality insulator, has high thermal conductivity, high resistance to oxidation, good chemistry and thermal stability. It’s used for composite material modification and sensors. There are many important uses for layers.
2. Cubic Boron Nickel
Cubic Boron Nitride (CBN) is a synthetic metal with a hardness that is comparable to diamond. The superhard material can be synthesized using hexagonal boron Nitride as a catalyst and at very high temperatures and pressures.
Cubic Boron Nitride is also available in amber or black. Most of the particles are less than one millimeter in size. This material is highly resistant to heat and chemical inertness so they are often used for super-hard tool making.
This is why the primary difference between cubic and hexagonal boron nutrides comes down to their physical properties.
Hexagonal Boron Nitride can be white or amber. Cubic boron Nitride, on the other hand, is mostly dark, black and amber. ;
Hexagonal Boron Nitride can be very flexible, but cubic boron Nitride can be extremely hard.
Hexagonalboron Nitride is a raw material that can be used for the production of cubic boron.
Hexagonalboron Nitride can be used for many purposes. Cubic Boron Nitride is commonly used in the manufacture of CBN tools.
It is the structure and characteristics of hexagonal Boron Nitride
According to the molecular diagram of hexagonal Boron Nitride, it belongs to the hexagonal Crystal System and shares the same hexagonal crystal structure with graphene. This is stackable by multilayer structures. It is connected by van der Waals force between the layers.
Cubic Boron Nitride is extremely stable in the atmosphere, with a broad bandgap of 5.1eV and high hardness (Mohs Hardness 2) can withstand temperatures as high as 2270degC. And it will also sublime to around 3270degC. The advantages of hexagonal boron nutride include good insulation, thermal conductivity, chemical stability and low thermal expansion/shrinkage.
These are the properties of hexagonal Boron Nitride
Due to its molecular structures, hexagonalboron nitride has many outstanding properties. They include high thermal conductivity and high heat resistance. At the same time, it also has chemical properties such as strong oxidation resistance, strong corrosion-resistance, and stable chemical properties.
(1) Very high heat resistance. Sublimation of hexagonal boron (hBN) is possible only when it has been heated above 3000 with 0.1Mpa nitrogen. Its strength at 1800 degrees is double that of ambient temperature. This makes it extremely resilient to thermal shock. It can be cooled down to 1500 degrees in the air. No rupture will occur at room temperatures dozens of other times.
(2) Excellent thermal conductivity. Product with hexagonal boron-nitride thermal conductivity around 33W/m*k. It has a thermal conductivity comparable to that of stainless and a higher thermal conductivity.
(3) A low coefficient of expansion. It has the second-lowest linear expansion coefficient, hexagonal boron nutride (2.06.5)*10-6/. Additionally, hexagonal boron nitride is extremely thermally conductive, which makes it excellent for resisting thermal shock.
(4) Very good electrical insulation. Hexagonalboron nitride is excellent at insulation in high temperatures. The maximum volume resistivity for high-purity hexagonalboron can exceed 10161018O*cm even at 1000C. However, the resistance to heat of this material remains at 104106O*cm.
(5) High resistance to corrosion. Hexagonalboron nitride is chemically stable and does not react with most molten and glass metals. This makes it resistant to acid, alkali as well as molten and glass. It also has excellent chemical inertness.
(6) Lower friction coefficient. Hexagonalboron nitride is a good lubricant with a friction factor of 0.16. This material has better resistance to high temperatures than graphite or molybdenum disulfide. You can use the oxidizing atmosphere up to 900 degC. It is also possible to use it under vacuum up to 2000degC.
(7) Machinability. Hexagonalboron Nitride can be finished using conventional metal-cutting techniques. It can turn products with accuracy of 0.05mm.
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