How many do you know about the properties and applications of boron nitride

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The World Bank expects global economic growth to slow significantly, from 5.5% in 2021 to 4.1% in 2022 and further to 3.2% in 2023. Growth in East Asia and the Pacific is expected to slow to 5.1 percent in 2022, reflecting the impact of China's economic slowdown, the report said. China's economic growth is expected to fall to 5.1% in 2022, close to potential growth, due to the ongoing impact of the COVID-19 pandemic and the Chinese government's tightening of regulations in certain sectors of the economy. The report said that the rapid spread of the Omicron variant means that the new crown epidemic is likely to continue to disrupt economic activity in the near future. In addition, decelerating growth in major economies, including the United States and China, will depress external demand in emerging markets and developing economies.
Slow economic growth has a huge impact on boron nitride.

Overview of Boron nitride

Boron nitride with the chemical formula BN is a thermally and chemically resistant refractory compound of boron and nitrogen. It exists in various crystalline forms that are isoelectronic to a similarly structured carbon lattice. The hexagonal form corresponding to graphite is the most stable and soft among BN polymorphs and is therefore used as a lubricant and an additive to cosmetic products.

 Boron nitride is a white solid material in the as-produced hot pressed form. It is a low porosity solid. It is easily machined into complex shapes using standard carbide tooling. The material is anisotropic in its electrical and mechanical properties due to the platy hexagonal crystals and their orientation during the hot press consolidation.

 Boron nitride is often referred to as “white graphite” because it is a lubricious material with the same platy hexagonal structure as carbon graphite. Unlike graphite, BN is a very good electrical insulator. It offers very high thermal conductivity and good thermal shock resistance. BN is stable in inert and reducing atmospheres up to 2000°C, and in oxidizing atmospheres to 850°C.

Applications of Boron nitride

Because of its excellent thermal and chemical stability, boron nitride ceramics are traditionally used as parts of high-temperature equipment. BN can be included in ceramics, alloys, resins, plastics, rubbers, and other materials, giving them self-lubricating properties.

Lubricant

Hexagonal boron nitride is used as a lubricant for paint, cosmetics, pencil lead and dental cement. Even in the absence of gas or water molecules in the compound layer, it has lubricity, making it a good component of the vacuum system. Compared with graphite, boron nitride has better chemical stability and conductivity.

Equipment in high-temperature environment

Its excellent heat resistance allows the compound to be used in a variety of applications involving extremely high temperatures. Hexagonal boron nitride is used to improve the lubricating properties of rubber, plastics, alloys and ceramics.

For plastics, the inclusion of BN components can reduce thermal expansion. It can also be integrated into semiconductor substrates and microwave oven windows.

Boron nitride is an effective ingredient in reaction vessels and crucibles due to its thermochemical properties.

Semiconductor industry

The bandgap of boron nitride ranges from 4.5 to 6.4 eV, making it an excellent wide gap semiconductor material. Its inherent thermal and dielectric properties make it a suitable substrate for the development of metal oxide semiconductor field-effect transistors (MOSFET) and semiconductors.

Grinding and cutting tools

Due to the physical properties of cubic boron nitride, this polymorph is used as an abrasive for nickel, iron and certain alloys, while diamond is considered inappropriate (for example, at high temperatures). Its cubic BN form is incorporated into cutting tools and grinding equipment.

 Boron nitride Price

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 Boron nitride supplier

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More information about Boron nitride

Properties and Information on Boron Nitride

Environmental Properties of Boron Nitride

Typical properties for hexagonal and cubic boron nitride

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