Hexagonal Boron Nitride (HBN) for Sale | Advanced Ceramic Materials

Hexagonal Boron Nitride Structure

Hexagonal boron nitride (h-BN) possesses a layered crystal structure similar to graphite, contributing to its moniker "white graphite." In this structure, each boron atom is bonded to three nitrogen atoms, forming hexagonal layers. The layers are held together by weak van der Waals forces, allowing them to easily slide over each other. The hexagonal arrangement of boron and nitrogen atoms creates a two-dimensional lattice, resulting in a planar structure.

The distinctive feature of h-BN is its alternating arrangement of boron and nitrogen atoms in hexagonal rings, providing the material with unique properties. This crystal structure imparts excellent electrical insulation, high thermal conductivity, and chemical stability to hexagonal boron nitride, making it a valuable material in various industrial applications. Additionally, the layered structure influences its lubricating properties and contributes to its resemblance to graphite, despite having different properties.

Hexagonal Boron Nitride Specification

Physical Properties
Chemical Formula	BN
Density (g/cm3)	2.28
Color	white
Crystal Structure	hexagonal
Water Absorption % @R.T.	0.0-1.0
Hardness Mohs	2
Mechanical Properties
Compressive Strength MPa @ R.T.	23.5
Tensile Strength MPa @ R.T.	2.41(1000ºC)
Modulus of Elasticity (Young's Mod.) Gpa	675
Flexural Strength (MOR) MPa @ R.T.	51.8
Electrical Properties
Dielectric Constant 1MHz @ R.T.	4.08
Dielectric Strength kV/mm	374
Electrical Resistivity Wcm @ R.T.	10^13
Thermal Properties
Max. Use Temperature (* denotes inert atm.) ºC	985
Thermal Shock Resistance DT (ºC)	>1500
Thermal Conductivity W/m-K @ R.T.	20

Hexagonal Boron Nitride Applications

Hexagonal boron nitride (h-BN), also known as "white graphite," is a material with diverse applications, thanks to its unique properties. Here's a breakdown of its versatile use across different industries:

Plasma Arc Welding:

Acts as a protective coating in welding applications.
High thermal stability prevents molten metal adhesion.

Semiconductor Manufacturing:

Serves as a substrate for crystal growth equipment.
High purity and thermal conductivity ideal for semiconductor processing.

Powder Metal Processing:

Functions as a solid lubricant to reduce friction and wear.
Enhances the efficiency of powder metallurgy component production.

Aluminum Metal Processing:

Acts as a mold release agent with thermal stability.
Non-reactive with molten aluminum, ensuring efficient processing.

Tool and Die Manufacturing:

Used as a coating material for cutting tools.
Provides hardness, wear resistance, and thermal stability for prolonged tool life.

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Your HBN Ceramics Supplier

Advanced Ceramic Materials is a leading supplier of hexagonal boron nitride ceramic products of the highest quality for a wide range of applications. We are happy to provide advice on materials, design, and application. Feel free to contact us with any questions about HBN or other ceramic materials that are not listed on the website.

FAQ

What Is the Crystal Structure of HBN?

Hexagonal Boron Nitride has a crystal structure similar to that of graphite, with boron and nitrogen atoms arranged in hexagonal layers that are stacked on top of each other. However, unlike graphite, hBN is an insulator with a wide band gap.

How Does HBN Compare to Other Materials with Similar Properties?

Hexagonal Boron Nitride is often compared to other materials such as graphite and diamond due to its unique properties. While graphite is a good conductor of electricity and has a low thermal conductivity, hBN has a high thermal conductivity and is an excellent insulator. Diamond, on the other hand, is known for its extreme hardness, while hBN is a good lubricant.

How Is HBN Synthesized?

There are several methods for synthesizing Hexagonal Boron Nitride, including chemical vapor deposition (CVD), reactive hot pressing (RHP), and annealing of boron nitride precursors. The most common method for producing hBN in large quantities is through the use of high-temperature and high-pressure conditions.

How Does the Thermal Conductivity of HBN Compare to Other Materials?

The thermal conductivity of Hexagonal Boron Nitride is among the highest of any known material, with values ranging from 200-400 W/mK at room temperature. This is comparable to the thermal conductivity of copper and silver, which are some of the best thermal conductors among metals.

What Makes Hexagonal Boron Nitride Suitable for Plasma Arc Welding Applications?

Hexagonal Boron Nitride is used in plasma arc welding due to its high thermal stability. As a protective coating, it prevents the adhesion of molten metal during welding, acting as an effective release agent and contributing to the efficiency of the welding process.

Why Is Hexagonal Boron Nitride Chosen as A Coating Material in Tool and Die Manufacturing?

Hexagonal Boron Nitride is utilized in tool and die manufacturing as a coating material for cutting tools. Its hardness, wear resistance, and thermal stability contribute to prolonged tool life, enhancing machining performance and making it a valuable component in precision tool and die production.

What Role Does Hexagonal Boron Nitride Play in Powder Metal Processing?

Hexagonal Boron Nitride functions as a solid lubricant in powder metal processing, reducing friction and wear between metal powders. This property enhances the efficiency of powder metallurgy component production, contributing to the manufacturing of high-performance components.