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Alloys
Term | Definition |
---|---|
Alloys | a mixture composed of two or more metal or a metal and a non-metal |
Alloys of iron | 0.5% carbon = mild steel, +nickel & chromium=stainless steel |
Why different properties? | when new atoms enter the metallic lattice of layers of metallic ions and the ‘sea’ of delocalised electrons, the layers no longer slide easily |
Making steel | molten iron from blast furnace to oxygen furnace, then Calcium oxide added to neutralise acidic impurities |
Stainless steel | 70% iron, 20% chromium, and 10% nickel (does not rust) |
Brass | 70%copper, 30% zinc (harder than copper, does not corrode) |
Bronze | 95% copper, 5% tin (harder than brass, does not corrode, sonorous) |