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Is alumina toxic to the human body?

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Author : Trunnano
Update time : 2022-09-26 10:04:51
Is alumina toxic to the human body?
Aluminum is commonly found on the earth in the form of alumina or bauxite. Once aluminum is exposed to the air, alumina is formed and a thin surface layer is formed on the aluminum, making it corrosion resistant.
Alumina is an insoluble compound of aluminum and does not produce acute toxic reactions. Chronic exposure can lead to health stimuli and some more serious health problems, but long-term exposure to alumina is almost non-existent in today's industry.
In addition to skin irritation, the absence of acute toxicity and the generally mild chronic toxicity of alumina is one reason that makes this compound an appropriate and common choice in the production of advanced ceramics.
 

What is alumina used for?
Alumina or aluminum oxide is one of the widely used technical ceramic materials for the production of various components in many industries. Alumina injection molding is a manufacturing process that provides customized components for different industries. The main applications include:
Medical industry: the chemical properties of alumina, as well as its hardness and biological inertia, make it a suitable material for a variety of medical applications, including biomimetic implants, tissue enhancement, prosthetics, hip replacement bearings, etc.
Protective equipment: the lightweight and strength of alumina make it an excellent choice for strengthening body and vehicle armor and for making synthetic sapphire bulletproof ballistics and windows.
Electrical industry: the high boiling point and melting point of alumina make this compound an excellent choice for the manufacture of high temperature furnace insulation and electrical insulators. Alumina is also widely used in the microchip industry.
Gemstone industry: alumina is used in the formation of sapphires and rubies. The crystalline form of alumina or corundum is the basic element for making these two precious gems.
Industrial applications: because alumina is chemically inert, it is the perfect filler for bricks, plastics and heavy pottery. It is also often used as a grinding component of sandpaper and is an economic substitute for industrial diamond.
 

Aluminium oxide nanoparticles
Alumina has forms of spherical, hexagonal flake, cube, cylinder, fiber, flower, curl, etc.
Nano alumina consists of fibers and rods. They have higher elastic modulus, better thermodynamic and chemical stability, moderate specific surface area and unique optical properties, so they are different from ordinary alumina in application.
Fibrous alumina is an important class of high-performance inorganic fibers, which is mainly composed of Al203, and some also contain metal oxides such as SiO2 and B2O3. It has the advantages of high strength, extraordinary heat resistance and high temperature oxidation resistance. It can maintain good tensile strength at higher temperature, the long-term service temperature is between 1450 ℃ and 1600 ℃, and because of its good surface activity, it is easy to compound with resin, metal and ceramic matrix to form many composites with excellent properties and wide application. It is considered to be the most potential high temperature material.
 

High purity alumina
High purity alumina is a white crystalline powder, which is usually divided into three types: 3N (99.9% purity), 4N (99.99% purity), and 5N (99.999% purity).
High purity alumina has good sintering properties, dispersibility, and high porosity.
4N high purity alumina is mainly used in rare earth tricolor phosphors and energy-saving lamps and lanterns.
5N high purity alumina is used to manufacture ceramic separator, sapphire crystal and lithium battery. Sapphire crystal is an ideal substrate for LED because of its excellent stability, high mechanical strength and easy cleaning. The demand for energy-saving standards has greatly increased the number of sapphires and increased the demand for high purity 5N alumina. Sapphire glass is also used as an iPhone mobile phone camera, driving the application of sapphire glass in household appliances and consumer electronics.
5N high purity aluminum is also used in the field of ceramic separators for lithium batteries. The coating of nano-alumina material on the surface of lithium battery diaphragm can greatly improve the high temperature resistance and safety of lithium battery.
High purity alumina has good mechanical, thermal and chemical properties, and is widely used in micro-ceramics, integrated circuits, rare earth phosphors, catalyst carriers and other fields.
 
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