Besides the typical applications of aluminum oxide as an abrasive substance, aluminium oxides are also widely used in a variety of engineering applications. They are excellent in electrical resistivity and stiffness-to-weight ratio. They can be used in robust composites and as substrates in integrated circuits. They are also used in the aerospace and chemical industries.
Aluminium oxides are also used in the production of many commercially important chemicals. They are particularly reactive to chlorine trifluoride. Aluminum oxides also have high corrosion resistance. When aluminum oxides are combined with other substances, they can cause fires. They can also cause upper respiratory tract irritation. In addition, aluminum oxides can also cause central nervous system effects.
Aluminum oxide is found naturally in phosphate rocks. It is also produced in a synthetic form. It has high electrical resistivity and a low thermal expansion. It is used in many applications, including in the aerospace industry, as an abrasive substance in sandpaper, and as a substrate in integrated circuits. It is also used as a protective layer for aluminium.
Aluminum oxides are resistant to corrosion by wet conditions. However, they are susceptible to pitting corrosion. Pitting corrosion occurs when Cu-rich remnants from dealloyed S-phase particles form a galvanic bond with the aluminium matrix. Pitting corrosion sites can also initiate from Al-Cu-Fe-Mn particles.
Aluminium oxide is used in a variety of applications, including in the aerospace industry, as a protective layer for aluminium, and in high temperature cements. Aluminium oxides are also used in the production and use of many commercially important chemicals.