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Aluminum oxide, also known as alumina, is a compound formed from aluminium and oxygen. It is a high-performance ceramic material with excellent properties including good electrical insulation, high mechanical strength, hardness and corrosion resistance. Alumina can be machined and molded into hard, wear-resistant materials that find application in a wide range of industrial roles. These include wire guides, machinery seals, refractory and high-temperature electrical insulators. It also has a favorable stiffness-to-weight ratio.
Aluminum oxide is an odorless white powder that does not dissolve in water. It has a very high melting point (2,00 C or 3,600 F) and boiling point (5000 F). It is an insulator with a relatively low coefficient of thermal expansion. It is highly reactive with chlorine trifluoride and ethylene oxide, forming toxic vapors upon contact.
The specific heat of a synthetic polyolester-based aluminium oxide (Al2O3) nanolubricant for chiller applications was measured over a temperature range of 4 degC to 45 degC. The specific heats were measured for two nanoparticle diameters: 112 nm and 148 nm, determined by dynamic light scattering (DLS) on a number-weighted basis. The results were compared to predictions calculated from two existing models. The specific heats of the lubricants linearly increased with increasing temperature and exhibited a strong dependence on the nanoparticle mass fraction.
