Advantages and disadvantages of spherical Alumina(Al2O3) manufacturing method
Kelly Chemical provides spherical alumina materials of various particle sizes (nanometer/micrometer), allowing you to achieve high filling and high thermal conductivity effects through different particle size combinations.
The demand for spherical alumina is expected to experience explosive growth along with the flourishing development of the thermal conductivity market!!
As human civilization continues to evolve (5G, AI, metaverse, blockchain, Internet of Things, cloud servers, electric vehicles, energy storage, etc.), electronic components are advancing towards high-density, high-speed operation, miniaturization, and integration. Meanwhile, high-tech products inevitably generate more heat during operation. If heat is not dissipated in a timely manner, it can reduce the effectiveness of products, shorten their lifespan, and even pose safety concerns.
Polymeric materials such as epoxy resins, phenolic resins, and silicones are commonly used as encapsulation materials for electronic components due to their excellent insulating properties and processability. However, polymeric materials have poor heat dissipation capabilities, severely affecting the thermal efficiency of electronic components. To improve the thermal conductivity of polymeric materials, a common method is to add fillers with higher thermal conductivity to the polymer matrix to prepare high thermal conductivity polymer-based composites.
(Extended Reading:Four tips to improve thermal conductivity with Alumina (Al2O3)!!)
Therefore, with the vigorous development of high-energy-consuming fields such as 5G and new energy vehicles, thermal conductive materials will become critical materials, and spherical alumina, as the main filler solution, is expected to experience explosive demand along with the growth of the thermal conductivity market.
Below, we summarize the advantages and disadvantages of several methods for manufacturing alumina:
|
Manufacturing Method |
Advantages |
Disadvantages |
|
Homogeneous Precipitation Method |
High sphericity, good dispersion |
Usually requires aluminum sulfate as raw material, harmful sulfides are generated during the calcination stage |
|
Drip Method |
Better physical stability and compressive strength, effective control of particle size, density, and pore size |
Requires the use of hot oil and must maintain sol stability for a long time during dripping
|
|
Template Method |
High product purity, good dispersion |
Strict requirements for the template, complex preparation process, and difficult operation |
|
Spray Method |
Industrial production available from micron to nano level |
Complex reaction equipment required |
|
Sol-Gel Method |
Spherical particles with finer particle size (nano) and good dispersion |
Requires the addition of a large amount of solvent and surfactant, increased difficulty in separation and drying, and high-temperature calcination in the later stage, posing a challenge to maintaining spherical particle shape |
For spherical alumina, general requirements focus on sphericity, product purity, particle size distribution, metal impurities, oil absorption value, and dispersibility. However, preparing spherical alumina with high purity, narrow particle size distribution, good particle dispersion, and suitability for industrial production remains a challenge.
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