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In this article, we’ll discuss what really characterizes the AlN ceramic laminate. The relevant information is available for pcb design engineers to refer to in the selection of materials, And you can also call QFPCB to discuss. QFPCB offers the best services when it comes to the Ceramic Substrate, so please feel free to contact us.
Aluminum Nitride (AlN) ceramic, a standout among advanced ceramic materials, has become a key enabler of technological innovation across various high-tech industries—including electronics, semiconductors, aerospace, and high-temperature industrial applications—thanks to its unique combination of physical and chemical properties.
Product Description:
Aluminum Nitride is the best available thermally conductive material (170 W/mK) that is also a strong electric insulator. It is therefore used in a variety of applications where heat needs to be transferred away from a component or circuit(such as below application picture). Furthermore, it has a low coefficient of thermal expansions resulting in a close CTE match with other materials like silicon and other ceramics. These characteristics make AlN a perfect material for packages and submounts of power components like power LEDs, high powers IC, high voltage inductors.
Our Aluminum Nitride substrates are available in various sizes and thicknesses. Thanks to a large and live inventory, we can ship your part fast for you to start your project.
Our Service：
Please contact us for customization. We can also supply Aluminum Nitride Ceramic with thermal conductivity up to 230W/mK.
Type of Produc:
The Features of AlN Ceramic Substrate
1.Excellent Thermal Conductivity
At room temperature, AlN ceramic exhibits a thermal conductivity ranging from 170 to 220 W/(m·K). This significantly surpasses that of alumina ceramic (Al₂O₃, ~30 W/(m·K)) and is comparable to that of metallic aluminum (~230 W/(m·K)). At the microscopic level, AlN crystals adopt a hexagonal wurtzite structure with tightly packed atomic arrangements, which greatly reduces phonon scattering and significantly enhances heat transfer efficiency. This property makes AlN ceramic indispensable in the production of heat dissipation substrates for high-power electronic devices (such as LEDs, IGBTs, and laser diodes) and in semiconductor packaging processes.
2.Outstanding Electrical Insulation Properties
AlN ceramic demonstrates excellent electrical insulation characteristics, including high resistivity (>10¹⁴ Ω·cm), low dielectric constant (8.8–9.5), and low dielectric loss (<0.001). Notably, it maintains stable insulation performance even under high-frequency and high-temperature conditions. These attributes make it an ideal choice for high frequency circuit substrates and microwave window applications.
3.Matched Low Thermal Expansion Coefficient
Within the temperature range from room temperature to 400°C, AlN ceramic has a coefficient of thermal expansion (CTE) of 4.5×10⁻⁶/°C, which is very close to that of silicon (Si, 3.5×10⁻⁶/°C) and gallium arsenide (GaAs, 6×10⁻⁶/°C). This close thermal compatibility helps minimize thermal stress between AlN and semiconductor materials, thereby significantly enhancing the reliability and service life of electronic devices.
4.Excellent Mechanical Properties
Aluminum Nitride ceramic boasts a flexural strength of 300–400 MPa, a Vickers hardness of approximately 12 GPa, and an elastic modulus of about 330 GPa. These values indicate outstanding wear and impact resistance, making it suitable for high-temperature mechanical components and precision structural parts. However, its relatively high brittleness requires careful consideration in practical applications.
5.Remarkable High-Temperature and Chemical Stability
Aluminum Nitride ceramic has a high melting point of approximately 2200°C and remains stable in air up to 1400°C. At elevated temperatures, a dense protective oxide layer forms on its surface. Additionally, it offers excellent resistance to acid and alkali corrosion. These properties make it well-suited for extreme environments such as high-temperature furnace linings, corrosion-resistant reactors, and vacuum equipment.
6.Diverse Additional Characteristics
With a density of only 3.26 g/cm³, AlN ceramic is lighter than alumina ceramic (3.9 g/cm³), making it ideal for lightweight designs. It also complies with RoHS standards, is non-toxic and environmentally friendly, and holds promising potential for biomedical and environmental applications. Optically, AlN ceramic exhibits good transparency to infrared wavelengths in the 1–6 μm range, enabling its use in infrared windows and sensors.
7.Versatile Processing Methods
AlN ceramic can be formed using various methods, including pressureless sintering, hot pressing sintering, and spark plasma sintering (SPS). The addition of sintering aids such as Y₂O₃ not only reduces the sintering temperature to 1800–1900°C but also significantly enhances the material’s densification.
Owing to its exceptional overall performance, AlN ceramic has become the material of choice for applications requiring high thermal conductivity and reliability—particularly in thermal management for high-power electronics, where it is nearly irreplaceable. With ongoing advancements in materials science and processing technologies, Aluminum Nitride ceramic is expected to overcome current limitations and unlock even greater value across a broader range of fields.
If you have any further questions, please feel free to leave a comment below or contact QFPCB by email ([email protected]).
