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Boron Nitride powder is a white and lubricant powder. By means of hot pressing at high temperature and pressure, Boron Nitride ceramics are produced into a block as big as 480*480mm. BN ceramic is a machinable ceramic that can be easily cut into plates, rods or machined into complex shapes.
Hexagonal Boron Nitride Ceramic provides excellent mechanical, chemical, electrical and thermal properties, so it’s widely used for industrial applications in harsh environment.
Unipretec produces 5 grades of boron nitride ceramic, BN-1700, BN-2000, BN-2300, BN-2800 and BN-3000.
BN-2000
99% purity boron nitride, it’s the most common used hot-pressed BN material. It’s generally used in applications where high temperature and corrosion resistance capability is required, because it’s resistant up to 2000ºC in inert or vacuum environments, and it’s non-wet by most molten metals. With good thermal conductivity and thermal shock resistance, BN-2000 is recommended for applications such as crucibles of melting metals, high temperature insulation components, high temperature electrode protection tube and insulators, and plasma chambers for hall effect thruster.
BN-1700
99.7% purity boron nitride is the highest purity hBN without any binder added. This material offers extreme high temperature resistance in vacuum furnace, superior thermal shock resistance and exceptional thermal conductivity, it’s suitable for high temperature ceramic manufacturing, particularly for crucibles, sintering setter plate of Aluminum Oxide AlN ceramic manufacturing. BN 99.7% purity material produced by UNIPRETEC has been working for crucibles of sintering AlN ceramic substrates for years with big volume and consistent good quality.
BN-2300
BN-2300 is a composite of boron nitride and alumina matrix. The alumina composite contributes to its better mechanical strength and non-abrading properties. With an added benefit of good thermal conductivity, non-wetting by molten metals and easy machining, BN-2300 is an ideal material for molten metal applications such as metal atomizing nozzles, and side dams for thin strip casting.
BN-2800
Unipretec hexagonal boron nitride grade BN-2800 combines boron nitride with aluminum nitride to get higher thermal conductivity. AlN material also contributes to better mechanical strength. This material has an advantage in applications where high thermal conductivity and high temperature is required.
BN-3000
BN-3000 grade machinable ceramics combine the non-wetting properties of hBN with extremely wear resistance of zirconia material. It also offers high thermal conductivity and superior high temperature strength. All this makes it an excellent choice in molten metal applications, such as continuous casting break rings, nozzles for metal atomization, and side dams for thin strip casting.
Solid Boron Nitride Ceramic Applications
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>>> Boron nitride (BN) is a hard ceramic material with excellent thermal conductivity and good thermal shock resistance; it is sometimes referred to as "white graphite" owing to its comparable planar hexagonal structure and lubricous properties.
>>> The hexagonal form of boron nitride is used as a lubricant in paints, cosmetics, pencil lead, and dental cement. It is possible for it to have a lubricating effect even when there are no gas or water molecules present within the compound layers, which is one reason why it is an important part for vacuum systems.
>>> Due to the fact that boron nitride absorbs a minimal quantity of water, any water that is absorbed will be loosely bound.
>>> Only at temperatures above 1400°C do elements like Fe, Co, and Ni (which are elements in various types of steels) interact with BN. Reactive and low-melting metals such as Ga and Sn do not wet BN until temperatures reach 1100°C.
>>> Because BN has a nearly zero thermal expansion coefficient, it maintains its dimensions over a wide temperature range. Due to intrinsically high thermal conductivity, low density (about 50% less than that of alumina), and low thermal mass, BN is essentially unaffected by sudden changes in temperature.
>>> UNIPRETEC boron nitride grades are distinguished by their composition, and thus by the specific properties they provide. The industry-leading high purity grade, BN1700, is ideal for ceramic substrate sintering setters. Our standard purity grade, BN2000, has a high level of wear and corrosion resistance that makes it ideal for metal forming applications. BN2300 is a composite of BN and alumina, making it the optimal material for metal powder gas atomising nozzles. BN2800, a composite of BN and Aluminum Nitride, is distinguished by its exceptional thermal conductivity. BN3000 is a composite of BN and zirconia with increased strength and expansion coefficient.
>>> Our internal machining capabilities enable us to satisfy customers who require machined components. Please send us your drawing or sketch, along with the grade reference and tolerance specifications. All BN grades are simple to machine, and the finished part can be designed with intricate surfaces, pockets, channels, grooves, holes, and threads, etc.
>>> The most important aspect to remember is that boron nitride is machined dry - without the use of coolants or lubricants. Standard carbide tip tooling can be used to machine the majority of grades. Diamond-tipped tooling is necessary for the BN3000 to operate effectively.
>>> Solid BN grades can be kept for 3 years. Boron nitride should always be stored in a dry, tightly sealed environment, preferably in its original packaging, to prevent exposure to moisture.
Alumina (Al2O3)
Alumium Niride (AlN)
Boron Nitride (Hex BN)
Machinable Glass Ceramic
Silicon Nitride (Si3N4)
Zirconia (ZrO2)
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