What is the difference between aluminum powder and alumina powder
Description
Aluminum powder, commonly known as "silver powder", is a silver metallic pigment. It is made by adding a small amount of lubricant to pure aluminum foil, crushing it into scaly powder, and polishing it. wholesale aluminium oxide The aluminum powder is light in weight, high in floating power, strong in hiding power, and good in reflecting light and heat. After treatment, it can also become non-floating aluminum powder. Aluminum powder can be used to identify fingerprints and can also be used as fireworks. Aluminum powder is a large category of metal pigments due to its wide application, large demand and variety.
Alumina powder is often used as a medium for chromatography.
Alumina is the reason why metal aluminum is not easily corroded in the air. Pure metal aluminum is very easy to react with oxygen in the air to form a thin aluminum oxide film covering the surface of aluminum exposed to the air. This aluminum oxide film can Prevent aluminum from being continuously oxidized. The thickness and properties of this oxide film can be enhanced by a process called anodic treatment (anodic corrosion protection).
Alumina powder is used as a high temperature refractory material to make refractory bricks, altars, porcelain, artificial gems, etc. Alumina is also a raw material for aluminum smelting. Calcined aluminum hydroxide can produce y-Al203. y-Al203 has strong adsorption and catalysis Active, can be used as adsorbent and catalyst.
The main component of corundum is α-Al2O3. Barrel or cone-shaped trigonal crystals. It has glass luster or diamond luster. The density is 3.4.1g/cm3, the hardness is 9, the melting point is 2000±15°C. It is insoluble in water, insoluble in acid and alkali. .High temperature resistance. Colorless and transparent ones are called white jade, red with traces of trivalent chromium is called ruby; blue with divalent iron, trivalent iron or tetravalent titanium is called sapphire; a small amount of trivalent iron tetroxide is darkened Gray and dark black are called corundum powder.
It can be used as bearings for precision instruments, diamonds, grinding wheels, polishing agents, refractory materials and electrical insulators for watches. The colorful ones can be used as decorative gems. The artificial ruby single crystal can be used as the material for lasers. In addition to natural minerals, hydrogen and oxygen can be used It is made by flame melting aluminum hydroxide.
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