alumisi

Alumisi is a term used in materials science to refer to the aluminisation process, in which aluminum-containing coatings are diffused into a metal substrate to form aluminide phases that protect against high-temperature oxidation. In some languages and technical texts, the related term aluminisasi is used, and alumisi may appear as a shortened or regional variant.

The process involves depositing aluminum into the surface of a base metal through methods such as pack cementation, vapor-phase aluminiding, or chemical vapor deposition. The resulting coatings often consist of aluminide compounds, such as FeAl or NiAl, which promote the growth of a protective aluminum oxide (alumina) scale when exposed to high temperatures. This diffusion coating enhances resistance to oxidation, corrosion, and thermal fatigue, extending component life in demanding environments.

Common applications of aluminised coatings include turbine blades, exhaust manifolds, valves, and other high-temperature components in aerospace, power generation, and chemical processing. The coatings can be tailored by adjusting aluminum concentration, coating thickness, and subsequent surface treatments to balance oxidation resistance with mechanical properties such as ductility and adhesion.

Benefits of alumisi-backed coatings include improved high-temperature stability, reduced oxidation rates, and extended service intervals. Limitations can include higher manufacturing costs, potential changes in substrate mechanical properties due to diffusion, and the need for careful control of coating processes to avoid detrimental phases or cracks. Overall, alumisi (aluminisation) remains a key technique for protecting metallic components in harsh thermal environments.