The plasma chamber (discharge chamber) is its core component, where propellant ionization occurs and which must withstand intense thermal energy and continuous energetic ion impact from plasma. Hexagonal boron nitride (h-BN) is the benchmark material for this component. Boasting excellent high-temperature resistance, ion bombardment resistance, and favorable secondary electron emission properties, it maintains the structural integrity of the chamber under extreme discharge conditions, improves ionization efficiency, and suppresses chamber erosion and contamination, serving as a key material for the efficient, stable, and long-duration operation of the thruster.
Properties:
- High Thermal Stability and High-Temperature Resistance
- Superior Electrical and Dielectric Insulation
- Outstanding Chemical Inertness and Corrosion Resistance
- Precision Machinability and Smooth Surface Finish
INNOVACERA utilizes high-purity raw materials and advanced hot-press sintering processes to guarantee uniform microstructure and consistent dielectric performance. Each batch of products undergoes rigorous thermal, electrical, and high-vacuum plasma compatibility tests to meet the most stringent high-reliability operational requirements. We support customers in customizing channel dimensions, annular geometries, and complex mounting profiles, providing professional technical support to assist in thruster thermal balancing and propulsion performance optimization.
Boron Nitride Material Properties
| Properties | Unit | UHB | HB | BC | BMS | BMA | BSC | BMZ | BAN | BSN |
| Main Composition | - | BN>99.7% | BN>99% | BN>97.5% | BN+SiO2 | BN+Al2O3 | BN+SiC | BN+ZrO2 | BN+AlN | BN+Si3N4 |
| Color | - | White | White | White | White Graphite | White Graphite | Greyish-Green | White Graphite | Greyish-Green | Gray Black |
| Density | g/cm³ | 1.6 | 2.0 | 2.0~2.1 | 2.2~2.3 | 2.25~2.35 | 2.4~2.5 | 2.8~2.9 | 2.8~2.9 | 2.2~2.3 |
| Three-Point Bending Strength | MPa | 18 | 35 | 35 | 65 | 65 | 80 | 90 | 90 | / |
| Compressive Strength | MPa | 45 | 85 | 70 | 145 | 145 | 175 | 220 | 220 | 400~500 |
| Thermal Conductivity | W/(m·K) | 35 | 40 | 32 | 35 | 35 | 45 | 30 | 85 | 20~22 |
| Thermal Expansion Coefficient (20~1000°C) | 10^-6/K | 1.5 | 1.8 | 1.6 | 2.0 | 2.0 | 2.8 | 3.5 | 2.8 | / |
| Max Using Temperature In Atmosphere In Inactive Gas In High Vacuum (Long Time) |
°C | 900 2100 1800 |
900 2100 1800 |
900 2100 1900 |
900 1750 1750 |
900 1750 1750 |
900 1800 1800 |
900 1800 1800 |
900 1750 1750 |
900 1750 1700 |
| Room Temperature Electric Resistivity | Ω·cm | >10^14 | >10^14 | >10^13 | >10^3 | >10^3 | >10^2 | >10^12 | >10^3 | / |
| Typical Application | - | Nitrides Sintering | High Temperature Furnace | High Temperature Furnace | Powder Metallurgy | Powder Metallurgy | Powder Metallurgy | Metal Casting | Powder Metallurgy | Metal Casting |
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Frequently Asked Questions
Why Is Hexagonal Boron Nitride Essential for Hall Thruster Discharge Chambers? How Does It Prevent Wall Sputtering?
In Hall Effect Thruster discharge channels, continuous bombardment by high-velocity xenon or krypton ions causes severe ceramic sputtering, surface degradation, and thermal shock. Hexagonal boron nitride (h-BN) offers an exceptionally low sputtering yield, high dielectric breakdown resistance, and superior thermal conductivity up to 1800°C in high vacuum. Its stable secondary electron emission (SEE) characteristics help maintain the magnetic confinement sheath, minimizing wall erosion and propellant contamination to guarantee thousands of hours of reliable in-orbit operation.
Developing High-Efficiency Electric Propulsion Systems? How to Source Custom h-BN Plasma Chambers from INNOVACERA?
INNOVACERA supplies ultra-high-purity h-BN (>99.7% UHB grade) and tailored composite formulations (such as BN-SiO2, BN-ZrO2, and BN-AlN) engineered for extreme vacuum and plasma environments. Customers can custom annular discharge rings, cathode insulators, and thin-wall channel liners with tight CNC tolerances. Simply provide your thruster power rating, propellant chemistry, and dimensional drawings to receive application-validated ceramic chambers with full quality inspection documentation.
