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What is aluminium powder? Aluminum powder (also known as silver powder) is a metallic pigment that’s silver in color. It is produced by adding powder to aluminum foil and crushing it into a scaly powder. Aluminum powder has good reflectivity and heat, is light, buoyant, has high hiding power and is highly buoyant. After treatment it can become non-floating Aluminum Powder. Aluminum powder can identify fingerprints, and it can also be used in fireworks. Aluminum powder is a type of metallic pigment due to the wide range of applications, high demand and wide variety.

What is the purpose of aluminum powder?
Aluminum powder particles in the pigment have a scaly texture. The scaly particles are what give the aluminum powder its metallic colour and shielding effect. Metal aluminum powder is produced industrially since a very long time. Ramming was the early production method. The aluminum crumbs was placed in the grooves of punching machine. The machine drove a ramming hammer to punch continuously the aluminum crumbs into the groove. The ductile metal gradually becomes flake and shatters under the impact. The aluminum is then screened to remove the powder that is suitable for the product. The ramming technique has a low production efficiency, and it is hard to control the quality of the products. There is also a lot dust, which can easily catch fire or explode, in the process.
German Hamtag began producing aluminum powder using a mill in 1894. Steel balls, scrap aluminum and lubricants went into the ballmill, where the scrap aluminum was crushed by the steel balls. This resulted in scaly aluminium powder that filled the ballmill and pipeline with inertness. The method of “dry production” is still being used for gas. J. Hall in the United States developed the method of adding petroleum solvents to the ballmill to replace the inert air. The produced aluminum powder is then mixed with this solvent into a liquid to create slurry aluminum pigment. This method has been widely adopted because it is safe and easy to use. The “wet method” is the method used by most modern aluminum powders. Aluminum powder can also be used for the manufacture of fireworks and explosives. Certain types of electronic devices are also made from it. A lot of paints and sealing agents contain aluminum powder.

Is Aluminum Powder Dangerous?
Fine dust can cause lung scarring (pulmonary fibrosis), which is accompanied with coughing and shortness in breath. Aluminum powder can be a flammable, solid substance that may pose a fire risk.
Powder coating poses a lower risk to safety than conventional paint. Comparing powder/air to solvent/air, the ignition energy is 50-100x higher. However, any flammable powder, dust, or sand will combine explosively with air to create a dangerous mixture. Transport, storage, and processing are all safe if the appropriate measures are taken beforehand. To ensure safety, the powder concentration in the various powders listed above must not exceed 10g/m3. This concentration is often exceedingly high in the spray area. There is always sufficient oxygen in the air, so it is essential to avoid sparks with more energy.

Comparing resin powders without pigment, adding 5-6% of aluminum powder increases the “powder constant” (Dust Constant is a measure for explosive power), and the maximum explosion pressure by 10%. As the amount of aluminum powder increases, so will the explosive power. Aluminum powder with a content greater than 25 percent will have the same explosive power as pure metal powder. This dependency on aluminum powder pigments is not responsible for the lowest initiation energy. Pure resin powder will not reach the initiation energies, no matter what dispersion technique is used. Aluminum powder with a pigment content >10%, fine particles and uncoated aluminium powder can reduce the ignition energy.

Powder coatings with aluminum powder are identical to pigmented coatings. Fire or explosion is not a problem as long they don’t exceed the specified limit.
Aluminum powder must not be separated, accumulated or concentrated in the factory to ensure the safety of spraying. These requirements are also applicable to solvent-based paints containing gold and copper powder. The explosion risk directly caused by the copper-zinc powder alloy is lower than that of aluminum.
Aluminium powder characteristics
Aluminum powder suitable for pigments is aluminum powder with scale-like particles, whose surface has been treated. Aluminum powder paste consists of a pigment, aluminum powder, and solvent. Its characteristics and use are similar to those of aluminum powder. The output and dosage is larger because it’s easy to use. Comparing to other pigments, the aluminum powder for paints has more features in these aspects:
1. Scaly coverings have certain characteristics.
Aluminum powder particles are scaly and have a diameter-to-thickness ratio of about (40 to 1) – 100:1. Aluminum powder dispersed on the carrier has a characteristic of being parallel. Several aluminum powders have been connected. The powder particles are filled together to form a continuous metallic film that covers the surface and reflects light from outside. The uniqueness of aluminum powder lies in its ability to hide. The surface area of the aluminum powder is a function of the diameter-to-thickness ratio. Aluminum is stretched during the grinding process, the diameter-to-thickness ratio continues to increase, and the hiding power also increases.
2. Aluminum powder has shielding properties
The aluminum dispersed in carrier film floats and, as a result, it always forms a parallel layer of aluminum powder on the substrate. These layers are arranged in multiple parallel layers within the carrier. The spacing between the layers of aluminum powder prevents the capillary pores in the carrier film from allowing moisture or gas to pass through. This is due to the physical shielding properties of aluminum powder.
3. Aluminium powder has a wide range of optical properties
The aluminum powder has a metallic luster and a light colour. Its smooth surface can reflect between 60%-90% the visible light, UV light, and infrared. The surface of the object is coated in paint that contains aluminum powder. This is the result of aluminum powder reflecting sunlight.
4. The “two color effect” of aluminum powder
Aluminum powder exhibits a metallic luster, and is parallel to the coated item. The gloss and color depth change depending on the incident angle and viewing angles of the incident light in the carrier that contains transparent pigments. This is known as “two-color” effect. Aluminum powder is placed in layers in the coating. When light strikes each layer of aluminum flake, the film thickness is weakened and the brightness of the reflected light changes. As light enters a film that contains transparent pigments, it passes through the particles of pigment to become colored and is then reflected by various levels of aluminum. This results in changes of color tone and metal light. This property of aluminum powder has led to its widespread use in coatings such as metallic paint and hammer paint.
5. Aluminium powder floating properties
The large floating type of aluminum pigments and powders for coatings is characterized as scaly floating at the surface of the film.

This 3D printed electric motorcycle is fully functional and made with aluminum powder
Airbus has entered the 3D motorcycle market. Light Rider is a 3D printed electric bicycle that is also the future for electric cars.
This 3D bike was launched by APWorks, a subsidiary of Airbus, and was described by them as “corrosion-resistant, combined with lightweight aluminum and almost specific strength titanium.” Scalmalloy – a special alloy for APWorks – is responsible for these qualities. Aluminum powder developed by researchers.
So, what is the best way to use powder for printing something as sturdy as a bicycle. Airbus has explained that Light Rider is made of thousands thin layers with a thickness of 60 microns. Hollow frame adds to the appeal of this 3D printed electric bike. Comparing to other bicycles the frame weight has been reduced by 30%. Joachim Zettler – CEO Airbus APWorks GmbH – explained that this bicycle cannot be made using traditional milling or welding techniques. The team decided on a hollow, branched structure. So, now each Light Rider 3D printed weighs less than 35kg.
Light Rider may seem like a toy but it is incredibly practical. The top speed of the Light Rider is 49m/h, despite not being Harley. The company aims to use 3D printed electrical bicycles mostly for urban driving. Airbus claims the battery of its electric vehicle can travel 37 miles after each charge.
(aka. Technology Co. Ltd., a trusted global chemical supplier & manufacturer has more than 12 years of experience in providing high-quality Nanomaterials and chemicals. Our company is currently developing a number of materials. Aluminum powder produced by us is high-purity, has fine particles and contains low impurities. Send us an e-mail or click the desired products to Sending an inquiry .

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