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Boron Nitride Plasma Chambers for Hall Effect Thrusters

One common application for boron nitride is channels used in Hall-effect thrusters for satellites. A hall effect thruster combines an electric field with a magnetic field to ionize a gas flow to generate plasma. The electric field inside an annular channel accelerates the ions in the plasma to very high exhaust velocities.

  • Density :

    1.90 - 2.00 g/cm3
  • Max. Service Temp. :

    2,100 degree C
  • Thermal Conductivity :

    35 W/m.K
  • Main Application :

    Hall Effect Thrusters
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Product Detail

Hall Effect Thrusters


▼ BN for Hall Effect Thrusters

Hall-effect thrusters use plasma as a method of propulsion for orbital satellites and deep space probes. This plasma is generated by the ionization of propellant gas, which is passed through an intense radial magnetic field within a high-performance ceramic channel. An applied electrical field axially accelerates the plasma and propels it through a discharge channel, reaching potential exit velocities in the tens of thousands of miles per hour. The challenge of this advanced technology is the proclivity for ceramic discharge channels to succumb to premature plasma erosion.

For the plasma chamber in a hall effect thruster to work, an advanced ceramic is required that can withstand the high temperatures from the plasma generation process, whilst keeping the ionization efficiency at the highest possible values. Boron nitride ceramics have successfully been used to extend the lifetimes of Hall-effect plasma thrusters without limiting their ionization efficiency, nor their propulsion capabilities. Boron Nitride does just that due to its excellent resistance to sputtering as well as its secondary electron emission properties. UNIPRETEC grade BN-2000 has been successfully tested by satellite experts and are utilized in Hall-effect plasma chambers.


▼ Feuatures of Boron Nitride Material

  Excellent Machinability
  Good Chemical Inertness
  High Temperature Material
  Oustanding Electrical Insulator
  Excellent Lubricating Properties      
  Excellent Thermal Shock Resistance


Plasma Hall Effect Thrusters


▼ Properties of Boron Nitride Ceramic

 ITEM  UNIT  VALUE
 Main Content
 -              h-BN > 99%                       
 Density
 g/cm3
 1.90 - 2.00
 Binder
 -  Boric Oxide
 Color
 -  White
 Compressive Strength (25 °C)
 Mpa
 30
 Flexural Strength (25 °C)
 Mpa
 55
 Thermal Conductivity (25 °C)
 W/m.K
 35
 Thermal Expansion Coefficient (25-1,000 °C)
 10-6/K
 1.5
 Max. Use Temp. (Air Environment)
 °C
 900
 Max. Use Temp. (Vacuum Environment)
 °C
 1,900
 Max. Use Temp. (Inert Environment)
 °C
 2,000
 Electrical Resistivity (25 °C)
 Ω·cm
 >1014
∆ The data is offered for reference only, exact data will vary depending on producing method & part configuration.

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