1. What Are Alumina Ceramic Substrates?

Alumina ceramic substrates (Al?O? ceramic substrates) are high-performance ceramic materials primarily composed of aluminum oxide. They are typically manufactured through high-temperature sintering processes. Depending on the alumina content, they are classified into low-purity (75%-85% Al?O?), medium-purity (96% Al?O?), and high-purity (≥99% Al?O?) grades. Characterized by a dense microstructure and stable chemical properties, these substrates exhibit outstanding mechanical strength, high-temperature resistance, and electrical insulation. They are widely used as foundational materials in electronics, power systems, aerospace, and other advanced industries.

2. Advantages of Alumina Ceramic Substrates

Exceptional Electrical Insulation:With a high resistivity (>10¹? Ω·cm) and low dielectric constant (8-10), alumina ceramics effectively isolate electrical currents, preventing circuit shorting in high-frequency or high-voltage environments.

High Thermal Conductivity:Substrates with 96% alumina content offer a thermal conductivity of 24-28 W/(m·K), enabling efficient heat dissipation from electronic components to prevent overheating and extend device lifespan.

Superior Mechanical Strength:A flexural strength of 300-400 MPa, combined with high hardness (Mohs hardness 9) and wear resistance, ensures durability in demanding operational conditions.

Strong Chemical Stability :Resistant to acids, alkalis, oxidation, and moisture, alumina substrates maintain performance stability even at high temperatures (up to 1600°C) or in corrosive environments.

Precision Manufacturing:Precision machining allows micron-level surface smoothness, meeting strict dimensional requirements for applications like semiconductor packaging.

3. Disadvantages of Alumina Ceramic Substrates