What is Alumina

By Bester PCBA

Last Updated: 2023-08-14

What is Alumina

Alumina, also known as aluminum oxide (Al2O3), is a ceramic substrate widely used in PCBs. It is a material specifically designed and known for its exceptional electrical and mechanical properties. Alumina PCBs are cost-effective and offer significant thermal conductivity, making them suitable for applications that require efficient heat dissipation and temperature control.

The construction of Alumina PCBs typically consists of multiple layers. The circuit layers are made of copper, ranging from 1 to 20 oz in thickness, while an insulating layer made of thermally conductive and electrically insulated material is placed between the copper layers. The base layer of the PCB can be made of either copper or aluminum metal substrate.

Alumina PCBs provide several advantages. They offer exceptional strength, good hermeticity, high density, and excellent electrical properties. These properties make them suitable for interconnections in various devices. Alumina PCBs are commonly used in LED boards, high-frequency devices, and automotive circuits, where their thermal stability and performance contribute to efficient operation.

There are different types of Alumina substrates used in Alumina PCBs, including 96% Alumina substrate, 99.5% Alumina substrate, and 99.6% Alumina substrate. Each type has its own characteristics and is effective for different applications. For example, the 96% Alumina substrate is widely used in microelectronic applications due to its excellent electrical insulating properties and mechanical strength. On the other hand, the 99.6% Alumina substrate is recommended for standardized thin-film substrates and offers high mechanical performance, low thermal conductivity, and exceptional electrical insulation.

Frequently Asked Questions

What Is Alumina PCB Material

Alumina 96% PCB, also known as Aluminum Oxide (Al2O3) 96% or Alumina 96%, is widely utilized as a ceramic material for ceramic printed circuit boards and packages. It is highly favored due to its excellent thermal properties, low expansion rate, and ability to provide a hermetic seal, all at a relatively affordable cost and with ease of handling.

Is Alumina a Dielectric Material

Alpha phase alumina is known for its exceptional strength and rigidity among oxide ceramics. Its remarkable hardness, impressive dielectric characteristics, resistance to high temperatures, and favorable thermal properties have made it a preferred material for various applications.

Is Alumina Same as Aluminum

The main distinction between aluminum and alumina lies in their composition. Aluminum is a chemical element, while alumina is a compound that contains aluminum. Despite the similarity in their names, it is important to note that they are not the same. Alumina is specifically a compound that incorporates the aluminum chemical element.

Is Alumina Metal or Ceramic

Alumina is widely recognized as a highly stable material in terms of both chemical and physical properties. It is commonly used as a fine ceramic due to its exceptional thermal resistance and conductivity.

What Are the Advantages of Alumina

Alumina possesses superior mechanical strength compared to glass. Additionally, it exhibits greater resistance to thermal shock and is less susceptible to flaws and stress concentrators. Moreover, alumina offers significantly improved electrical insulation properties in comparison to glass.