Цзифэн Керамика
Керамика из нитрида бора (БН) Ceramics
Нитрид бора (БН) ceramics are advanced nitrogen ceramics that are mostly made of hexagonal boron nitride (ч-БН) crystal phase, people also call it “white graphite” because it has a layered look kind of similar to graphite. These materials have low density, good thermal conductivity, low thermal expansion, great lubricity and they hold up really well at high temperatures. In fact, Boron nitride ceramic can keep stable performance to about 900 °C in air. Also because of strong chemical inertness, электрическая изоляция, and pretty superior machinability, boron nitride ends up being one of the more important high-temperature structural as well as functional ceramics.
Crystalline Forms of Boron Nitride (БН)
Нитрид бора (БН) is believed to exist in various crystal structures such as hexagonal the BN (ч-БН) as well as cubic BN (c-BN) and the wurtzite BN (w-BN) and as an amorphous form. The most widely used and crucial to industrial applications is hexagonal BN (ч-БН) as well as cubic BN (c-BN). The various types of boron nitride have important distinctions in structure and characteristics that define their particular use areas
- Hexagonal BN is the hexagonal crystal structure of a layered that has a graphite-like structure that has fragile van der Waals forces between the layers. It exhibits minimal chemical activity. It also has outstanding resistance to high temperature oxidation, excellent quality lubricity, and exceptional conductivity properties for electrical insulation. This is by far the most frequently utilized phase in conventional ceramics with boron nitride.
- Cubic BN has a cubic crystal system that has diamond-like tetrahedral structures that makes it among the hardest materials that exist that is just behind diamond. It is characterized by outstanding thermal stability, superior chemical inertness, as well as exceptional wear resistance, which makes it ideal for cutting tools and high temperature Abrasion processes.
- Wurtzite BN is an hexagonal structure that is close-packed and is a metastable substance that forms at high temperatures and pressures. It exhibits a high degree of toughness similar to c-BN however is more uncommon in industrial applications because of its complicated synthesis conditions.
Boron nitride ceramics with hexagonal BN (ч-БН) as their primary crystallization phase, have excellent electrical insulation, high-temperature stability and self-lubricating properties making them the ideal material for high-temperature crucibles microwave components, as well as release agents. The cubic BN (c-BN) can be typically used in superhard cutting equipment and wear-resistant components.
Advantages Of Boron Nitride Ceramics
- High thermal stability: it keeps working, resisting oxidation even at big temperatures, and for long term service its up to 900 °С.
- Excellent thermal conductivity and low expansion: heat goes away efficiently, and it has a decent thermal shock resistance too.
- Superior lubricity & machinability:it’s a solid self lubricating sort of material, and you can machine it into complex shapes without much fuss .
- Outstanding insulation and chemical inertness: it resists most acids, alkalis and molten metals, plus it also shows good microwave transmittance.
Applications Of Boron Nitride Material
- High temperature components: like crucibles, evaporation boats, heat sinks, and even furnace linings.
- Electrical insulation: high voltage insulators, microwave dielectric windows, and for semiconductor packaging parts.
- Lubrication & release:high temperature lubricants, release agents for metal forming, sort of the usual.
- Aerospace and electronics:thermal management components, neutron absorber parts, and similar stuff.
