What is Aluminium-Silicon Alloy

What is Aluminium Silicon Alloy and how is it used?

Silicon-aluminum alloy is a binary combination of silicon, aluminum and magnesium that has the capacity to keep its outstanding properties.

Silicon is a good component in alloys of metal used for casting. Silicon is a great raw material because it increases fluidity, lowers melting temperatures, shrinks shrinkage and reduces shrinkage during the process of solidification. It also has a lower density (2.34g/cm3) and could be an advantage in reducing the total weight of casting parts. Silicon is extremely insoluble in aluminum. It precipitates in almost pure silicon which is very hard and improves wear resistance. The content of aluminum and silicon is extremely high, and the technology for making silicon powder is advanced. It is non-polluting to the environment, and it is safe for the human body.

Si-Al alloy has a density range of 2.4g/cm3 to 2.5g/cm3 and the coefficient of thermo-expansion (CTE), is 7-20ppm/. The density and thermal expansion coefficient of Si-Al alloy decrease significantly with the increase of silicon content. At the same time, Si-Al alloy also is characterized by excellent properties, like excellent thermal conductivity, excellent specific strength and stiffness. It also has a good coatings with silver, gold and nickel, able to be weldable using substrate, easy precise machining, and so on.

Silicon-aluminum alloy is an exciting electronic packaging material, especially in high-tech areas like aerospace, space technology and portable electronic devices.

What kinds of Silicon-Aluminum Alloys Are Available?

The crucial silicon-aluminum alloy used in the industry can be classified into four classes:

Hypoeutectic silicon aluminum alloy. The silicon content ranges from 9% to 12 percent.

Eutectic silicon aluminium alloy. The silicon content varies between 11% and 13%.

Hypereutectic silicon aluminium alloy. The silicon content is between 15 and 20 percent.

High-silicon aluminum alloy. Silicon content is higher than 22%, typically 25-70%, but up to 80 percent.

What is Aluminium-Silicon Alloy Used for?

The alloy of high-silicium-aluminum can be used to make lightweight, wear-resistant materials for all types of transport tools, power machines and fasteners for special applications.

Due to its low specific gravity and light weight, high-siliconium alloy is used extensively as pistons and cylinder liner for automotive engines. It also has low thermal expansion coefficient and volume stability.

It is also used for high power integrated circuit packaging.


Frames to fit optical lenses.

Parts of the heat sink.

Al-Si is a powerful deoxidizer that is a compound. Replacing pure aluminum during the process of making steel can increase the utilization rate of deoxidizer, purify melting steel, and enhance the quality of steel.

What Series is an Aluminium Silicon Alloy (ASI)?

4XXX series.

What exactly is Silumin?

Silumin is an aluminum-silicon alloy with strong and light weight is made of aluminum-silicon systems, is one of the most popular aluminum alloys. The majority of aluminum-silicon alloys contain 3 to 25 percent silicon. Al-Si alloys are used primarily for casting. However, they can be utilized in fast crystallization as well as powder metallurgy. The amount of silicon in alloys that are employed in powder metallurgy could be greater than that used for casting. Silumin is suitable for use in wet environments because of its excellent resistance to corrosion.

Si-Al Alloy Powder Price

Price is affected by many variables, such as supply and demand and economic activity, market trends and unexpected events.

Contact us via email for a quote request on the latest Si Al alloy powder price.

Si-Al Alloy Powder Supplier

Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) is a trusted global chemical material supplier & manufacturer with more than 12 years of experience in the field of providing high-quality chemicals and nanomaterials, including silicon powder, nitride powder, graphite powder, zinc sulfide calcium nitride, 3D printing powder, and many more.

If you’re looking for high-quality Si-Al alloy powder, please feel free to contact us to inquire.