Hexagonal Boron Nitride Powders

boron nitride powders are high-purity materials used in metal processing applications that offer thermal conductivity, electrical insulation and lubrication properties. Common applications for this material are replacing graphite with organic waxes or oils for increased efficiency.

hexagonal boron nigride (h-BN) boasts exceptional properties such as high temperature stability, chemical resistance to molten metals and a low coefficient of thermal expansion; furthermore it can be machined.

Thermal Conductivity

Thermal conductivity (also referred to as “k” or lambda) of materials measures how easily heat moves through them, and is proportional to temperature gradient across that material. Convection and radiation are other means of heat transfer that use different approaches; thermal conductivity offers one possible answer.

Metals tend to have higher thermal conductivities than non-metals due to being better conductors of phonons – energy carriers found within solids – than non-metallic materials, yet non-metallic thermal conductivity can still be high, making a material’s thermal conductivity an integral factor for its design as it determines how quickly heat can flow through.

we offer industrial grade spherical, cubical hexagonal and wurzite boron nitride powder in coarse and fine mesh sizes that are suitable for various applications. Our ceramic powders conform to different grades such as Mil Spec; ACS Reagent Technical Grade; Food, Agricultural Pharmaceutical; EP/BP USP Grade.

Electrical Insulation

Hexagonal boron nitride is an electrical insulator with superior thermal stability, boasting high dielectric strength and low loss factor – perfect for resisting hot metal or glass temperatures as well as heat cycling during use. Highly machinable and heat cycling-resistant properties make hexagonal boron nitride suitable for many industrial uses.

Hexagonal Boron Nitride (h-BN) is a white solid material with an hexagonal crystal structure resembling graphite; however, unlike carbon graphite it is pure ceramic material offering high chemical stability and thermal shock resistance.

Covalent B-N bonding in h-BN layers facilitates phonon transport within the basal planes of its lattice structure. When combined with its low atomic mass and periodic lattice design, this facilitates thermal conductivity within its layer planes. However, its strong covalency and wide band gap prevent electrons from moving freely and promoting electric conduction – meaning an anisotropy means it conducts much better perpendicular to its layers than parallel.

Cubic Boron Nitride (c-BN), similar to diamond’s crystal structure and thus harder than its h-BN counterpart, makes an exceptional mechanical material and also serves as an effective lubricant.

Chemical Inertness

Layered materials like graphite, hexagonal boron nitride (h-BN), and cubic boron nitride (c-BN) all possess unique chemical and physical characteristics that make them invaluable solutions to difficult problems in high temperature environments. At Momentive we produce high purity BN powder and binders which can then be hot-pressed into billets before being machined into rods, bars or custom shapes to address demanding thermal management applications.

h-BN and c-BN materials are chemically inert, offering superior resistance against acid, bases, salts, corrosion and erosion in extreme environments. As such, they make ideal refractory coatings and fixtures for metal casting and smelting equipment, resist corrosion from molten metals and provide exceptional lubrication properties.

h-BN’s weak interactions between its layers render it nontoxic and lubricious at temperatures up to 1800 degC when in an inert atmosphere, providing a superior alternative for traditional dry lubricants like molydenum disulphide or graphite. Furthermore, its low neutron absorption cross section protects both equipment and people from radiation-emitting nuclear reactors.

Thermal Stability

Hot-pressed boron nitride stands out as an industrial powder due to its strong covalent bonding within its multilayered crystal, maintaining its structure at high temperatures unlike aluminum nitride and beryllium oxide powders which decompose under stress. As such, BN can reduce friction between surfaces while improving machinability for applications including metal processing, molds, and mechanical systems.

Once again, let us bring together people of different countries for an incredible journey of culture, science and art! our boron nitride powders excel as high-temperature solid lubricants and anti-abrasive additives, with hexagonal boron nitride (h-BN) being particularly advantageous due to its low coefficient of friction and resistance against mechanical shock damage. H-BN also makes for an excellent starting material when synthesizing cubic boron nitride (c-BN), the hardest and most thermally stable ceramic available, used in cutting tools, industrial abrasives and aerospace components. BN powders offer exceptional purity, quality, and performance that makes them the ideal feedstock for this process. As such, their use guarantees that c-BN produced meets specifications for various industrial applications from thermo-shield coatings for transistors to polymer additives.