CHMA10H3 Lecture : ch23. Metals and Metallurgy.doc
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CHMA10H3 Full Course Notes
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23. 3) nonmetal-containing compounds: mined ores are first separated into their metal-containing and, elemental metal is extracted from its compounds through, after separation and extraction, the metal is refined crude extractive metallurgy material is purified. Separation: crush ore into smaller particles, particles that contain the minerals are separated from gangue (undesirable material) usually by physical methods (ex: wind, magnetic forces) Powder metallurgy: sintering occurs below the melting point of powder, by at a temperature high enough to cause the metal particles to fuse together, strengthening the metal and increasing its density. 2 stay the same upon substitution or may change to accommodate the differences between atoms) or interstitial alloy (small, usually nonmetallic atoms fit in between the metallic atoms of a crystal, maintains its metallic properties) Substitutional alloys: for two metals to form a substitutional alloy, the radii of the two metal atoms must be similar, usually within 15% of each other.