Boron Nitride


At MiMfactories, we create industrial ceramic products with many high quality ceramic materials. One of them is boron nitride. Typically, we use a type called hexagonal boron nitride.

Hexagonal Boron Nitride is a heat and chemically resistant compound of Boron and Nitrogen. Along with graphitic boron nitride, it is the most stable crystalline form of boron nitride. Because it has a similar structure to graphite, and because it is white in color, you may also hear it called “white graphite.”

Some industries that typically benefit from hexagonal boron nitride ceramics include:

  • Aerospace
  • Metalforming
  • Electronics
  • Heating and Cooling
  • Glass Fabrication
  • Military and Defense
  • Thermal Processing
  • Power Generation and Electricity
  • Mineral Processing

Boron nitride chemically inert, and possessed of low thermal conductivity, low thermal expansion and microwave transparency. It is also easily machined. In addition, it is non-wetting by glass, salts and most molten metals. This means that it cannot be wetted by any of these substances, and it is that much more resistant to chemical attacks.

Boron Nitride has unsurpassed thermal stability and is stable at temperatures up to 1000˚C in air, 1400˚ in vacuum, and 2800˚ C in an inert atmosphere. It is also self-lubricating, so it does not require the use of gas or water molecules trapped between its layers. Because of this, boron nitride ceramic parts can be used in a vacuum, which is essential for aerospace applications.

  • Heat resistant
  • Thermally stable (up to 1000˚C in air, 1400˚ in vacuum, and 2800˚ C in an inert atmosphere)
  • Chemical resistant
  • Chemically inert and stable
  • Low thermal conductivity
  • Low thermal expansion
  • Low dielectric constant
  • Non-wetting (glass, salts, some metals)
  • Self-lubricating
  • Easily machined
  • Electrically insulating

Some of the most common boron nitride applications we complete include:

  • Furnace fixture supports and components
  • Melting crucibles for glass and metals
  • Plasma and welding tip insulators
  • High temp thermal complete systems
  • Molten metal carrier pipes
  • Nuclear reactor shields and linings
  • Semiconductor wafers
  • Ceramic bushings
  • Heat radiation shielding
  • Ceramic washers
  • Transistor heat sinks
  • Sputtering targets
  • Microwave tubes
  • Ceramic coating and paints
  • Pump nozzles
  • Nanotechnology
  • Refractory molds for glass forming and titanium forming
  • Ceramic electrical insulators
  • Boats
  • Thermocouple protection sheaths

For information on standard boron nitride properties, check out the chart below.

Item Data
BN Content 99.50%
Density 2.00g/cm3
Compressive Strength 72kg/cm2
Bending Strength 55kg/cm2
Volume Resistivity >1014Ω*cm
Dielectric Constant 4.0 (108hz)
Breakdown Voltage 35Kv/mm
Specific Conductance 27W/m.k.
Porosity 0.3%