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Aluminum nitride (AlN) ceramics are high-performance technical ceramic materials widely recognized for their exceptional thermal conductivity combined with excellent electrical insulation. This unique combination allows AlN to efficiently dissipate heat while maintaining electrical isolation, making it an ideal solution for advanced electronic and semiconductor applications. In addition, AlN ceramics exhibit good mechanical strength, low thermal expansion, and strong resistance to high temperatures and corrosive environments, ensuring stable performance in demanding operating conditions.
One of the most important applications of AlN ceramics is in electronic substrates and heat sinks. In high-power electronic devices, LED modules, and laser diodes, effective heat dissipation is critical to maintaining performance and extending service life. AlN’s high thermal conductivity enables rapid heat transfer away from active components, while its excellent electrical insulation prevents short circuits and signal interference. As a result, AlN substrates and heat sinks are widely used in power electronics, optoelectronics, and high-density integrated systems.
Aluminum nitride ceramics also play a crucial role in semiconductor manufacturing. Their ability to withstand high temperatures and resist corrosive plasma environments makes them suitable for wafer processing components such as electrostatic chucks, heater stages, and other precision fixtures. These components must maintain dimensional stability, cleanliness, and reliability under extreme thermal and chemical stress, all of which are effectively provided by AlN ceramics.
In addition, AlN is extensively used in packaging for high-power and radio frequency (RF) modules. Its combination of high thermal conductivity and electrical insulation supports efficient thermal management while protecting sensitive circuits. AlN-based packages and substrates are therefore ideal for high-frequency RF modules and high-power integrated circuits, helping to improve system performance, reliability, and miniaturization in advanced electronic devices.
| Properties | Units | Value |
|---|---|---|
| Color | - | Grey |
| Mechanical Properties | ||
| Density | g/cm³ | 3.31 |
| Modulus of Elasticity | GPa | 310 |
| Fracture toughness | MPa · m1/2 | 3.5 |
| Poisson's Ratio | - | 0.25 |
| Compressive Strength | MPa | 2100 |
| Flexural Strength | MPa | 335 |
| Hardness (Knoop 100 g) | Kg/mm² | 1170 |
| Hardness (Vickers) | GPa | 11 |
| Thermal Properties | ||
| Maximum Temperature (Oxidizing) | °C | 700 |
| Maximum Temperature (Inert) | °C | 1300 |
| Thermal Conductivity @ 25°C | W/mK | 180 |
| Thermal Conductivity @ 300°C | W/mK | 130 |
| Specific Heat | J/kg.K | 750 |
| Thermal Shock Resistance ΔT | °C | 400 |
| CTE 25°C ➔ 100°C | 10⁻⁶/°C | 3.6 |
| CTE 25°C ➔ 300°C | 10⁻⁶/°C | 4.6 |
| CTE 25°C ➔ 500°C | 10⁻⁶/°C | 5.2 |
| CTE 25°C ➔ 1000°C | 10⁻⁶/°C | 5.6 |
| Electrical Properties | ||
| Dielectric Constant (1 MHz) | - | 8.6 |
| Loss Tangent (1 MHz) | - | 5×10⁻⁴ |
| Dielectric Strength | kV/mm | >15 |
| Volume Resistivity @ 25°C | Ω cm | >10¹³ |
| Volume Resistivity @ 300°C | Ω cm | 10⁹ |
| Volume Resistivity @ 500°C | Ω cm | 10⁷ |
Aluminum Nitride ceramics offer a unique combination of high thermal conductivity and excellent electrical insulation. This allows components to dissipate heat rapidly while preventing short circuits and electrical interference.
AlN ceramics can withstand high temperatures and resist corrosive plasma environments. This makes them highly suitable for critical wafer processing components, including electrostatic chucks and heater stages.
Based on the specifications, Aluminum Nitride exhibits a high thermal conductivity of 180 W/mK at 25°C, which gradually decreases to 130 W/mK at 300°C.
In oxidizing atmospheres, surface oxidation begins at around 700°C, forming an aluminum oxide layer. In inert atmospheres, this protective threshold extends up to approximately 1300°C to 1350°C.
While the resulting Aluminum Oxide layer offers some surface protection, it significantly reduces the overall thermal conductivity of the component, as alumina has a much lower thermal conductivity (~30 W/m.K) compared to AlN.
