A white, amorphous, inert substance known as alumina—also referred to as Aluminium Oxide—is frequently employed in industrial ceramics. Alumina has made a substantial contribution to numerous applications that have improved society and lengthened human life because of its exceptional qualities. Both the modern military and the medical field make extensive use of it.
Bauxite, which is regarded as the compound’s main source of aluminium, and corundum, a crystalline form of the oxide, are among the rocks that naturally contain aluminium oxide, a thermally unstable and insoluble compound. With the chemical formula Al2O3, fused aluminum oxide is an amphoteric oxide of aluminium. It is also frequently known as alumina. Although it is an electrical insulator, aluminium oxide has a reasonably high heat conductivity for a ceramic material (30 Wm1 K1).
About 45 million tonnes of alumina are produced annually in the world, and more than 90% of that amount is utilized to make aluminium metal. Speciality aluminium oxides are primarily used in ceramics, refractories, and polishing and abrasive applications. In addition, massive amounts are utilized to make zeolites, cover titanium pigments, and act as a fire retardant and smoke suppressant. Since 1970, materials such as Virgin Aluminium Oxide, often known as alumina, have been employed to create parts for surgical and prosthetic devices. In a living environment, it is extremely inert and impervious to corrosion.
It causes the tissues to react very little and is stable for several years of use. In emery, topaz, and emerald as well as in the priceless gemstones ruby and sapphire, it is found in nature as corundum. Using the Bayer process, it is commercially recovered from ores such as bauxite and cryolite. The manufacture of aluminium metal is its main application. It is frequently employed as an abrasive because of its hardness and as a refractory material due to its high melting point, in addition to uses in prostheses and surgical instruments.
Properties of Aluminium Oxide
Aluminium Oxide Powder differentiates from many related materials by providing equivalent to or superior options for affordable production and manufacturing thanks to its strong mechanical, chemical, and thermal properties.
The following characteristics are necessary for it to function:
| Property | Value |
| Melting Point | 2,072 °C (3,762 °F; 2,345 K) |
| Boiling Point | 2,977 °C (5,391 °F; 3,250 K) |
| Hardness | 15 – 19 GPa (9 on the Mohs scale) |
| Electrical Resistivity | 1012 – 1013 Ωm |
| Mechanical Strength | 300 – 630 MPa |
| Compressive Strength | 2,000 – 4,000 MPa |
| Thermal Conductivity | 20 – 30 W/mK |
| Molecular Mass | 101.96 g/mol |
| Density | 3.95 g/cm3 |
| Appearance | Solid |
Applications of Aluminium Oxide
Aluminium Oxide, often known as alpha alumina or aluminium or aloxite in the mining and ceramics industries, is widely used. Aluminium Oxide Manufacturers produced around 115 million tonnes of aluminium oxide worldwide each year in 2015; more than 90% of this material is used to make aluminium metal. Silica Aluminium Oxide is primarily used in abrasive, ceramic, polishing, and refractory applications. The production of zeolites, coating titanium pigments, and use as a fire retardant and smoke suppressant all need large quantities of aluminium hydroxide, which is the source of alumina.
Paint
For reflected aesthetic effects, such as in the automotive or cosmetic sectors, aluminium oxide flakes are employed in paint.
Composite fibre
For high-performance applications, aluminium oxide has been employed in a few experimental and commercial fibre composites. Particularly, the study of alumina nanofibers has attracted attention.
Body Armour
Alumina Ceramic plates are sometimes used in body armour, typically in conjunction with aramid or UHMWPE backing to obtain effectiveness against the majority of rifle threats. In countries where it is permitted, most civilians may easily find alumina ceramic armour, however, it is not regarded as military quality.
Abrasion protection
By anodizing or plasma electrolytic oxidation, hydrated aluminium oxide can be generated as a coating on the metal. Although the porous coating layer produced with traditional direct current anodizing procedures is within a range of 60-70 Rockwell hardness C, it is only comparable to hardened carbon steel alloys and significantly less than the hardness of natural and synthetic corundum.
The lower oxide layers, on the other hand, are much more compact than with standard DC anodizing techniques and present a higher crystallinity as a result of the oxide layers, Al2O3 clusters with substantially higher coating hardness values—around 2000 Vickers hardness—are produced by remelting and densifying the material. This results in a coating that is only porous on the surface oxide layer.
In coal-fired power plants, tiles made of alumina are mounted within pulverised fuel lines and flue gas ducting to cover high-wear regions. These tiles are brittle and prone to breaking, making them unsuitable for regions with significant impact forces.
Glass
Aluminium Oxide for Polishing is a common component in glass compositions. Aluminosilicate glass is a commonly used type of glass that often contains 5% to 10% alumina.
Aluminium Oxide Uses
- One of the often used components in sunscreen, aluminium oxide grit is also used in cosmetics including nail polish, blush, and lipstick.
- It is incorporated into glass compositions.
- As a catalyst, it is employed.
- It is used to take water out of the gas streams during the water purification process.
- It serves as an abrasive in sandpaper.
- An electrical insulator called aluminium oxide serves as the substrate for integrated circuits.
- Used in lamps that use sodium vapour.
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Other abrasives that we produce and supply include glass beads, copper slag, quartz sand, garnet mesh sand, steel shots, steel grits, etc. We also produce blasting equipment including abrasive blasting hoses, thermal spray gun, air compressors, flame spray guns, blast rooms, and a long list of others to blasting machines like sand blasting machine, shot blasting machine, grit blasting machine, engraving machine, etc.
