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AlSiC, pronounced "alsick", [1] is a metal matrix composite consisting of aluminium matrix with silicon carbide particles. It has high thermal conductivity (180–200 W/m K), and its thermal expansion can be adjusted to match other materials, e.g. silicon and gallium arsenide chips and various ceramics.
Aluminum oxide, silicon carbide, diamond, and cubic boron nitride (CBN) are four commonly used abrasive materials for the surface of the grinding wheels. Of these materials, aluminum oxide is the most common.
Silicon carbide (SiC), also known as carborundum (/ ˌ k ɑːr b ə ˈ r ʌ n d əm /), is a hard chemical compound containing silicon and carbon. A wide bandgap semiconductor , it occurs in nature as the extremely rare mineral moissanite , but has been mass-produced as a powder and crystal since 1893 for use as an abrasive .
Aluminium-silicon alloys typically contain 3% to 25% silicon content. [1] Casting is the primary use of aluminum-silicon alloys, but they can also be utilized in rapid solidification processes and powder metallurgy. Alloys used by powder metallurgy, rather than casting, may contain even more silicon, up to 50%. [1]
This tendency can be decreased by coating the silicon carbide particles with a suitable oxide or nitride, preoxidation of the particles to form a silica coating, or using a layer of sacrificial metal. [9] An aluminium-aluminium carbide composite material can be made by mechanical alloying, by mixing aluminium powder with graphite particles.
The abrasive aggregate is selected primarily according to the hardness of the material being cut. Chemical compatibility is also a concern. For example, because carbon alloys with iron, silicon carbide is not suitable for use with iron-based metals like steel. [citation needed] Aluminum oxide (A) Silicon carbide (S) Ceramic (C) Diamond (D, MD, SD)
It has, therefore, often limited its affordability and widespread use through cost-sensitive industries. This market is further faced with competitive pressure from cheaper alternatives such as silicon carbide and aluminum oxide, where unique properties of boron carbide are not essential in most applications.
Manganese - used in steelmaking; Silicon carbide, calcium carbide - used as ladle deoxidizer in steel production; Aluminum dross - also a ladle deoxidizer, used in secondary steelmaking; Calcium - used as a deoxidizer, desulfurizer, or decarbonizer for ferrous and non-ferrous alloys; Titanium - used as a deoxidizer for steels