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Using Our Resources (Useful Alloys (Examples of Steels are: (High carbon…
Using Our Resources
Useful Alloys
Copper, gold and aluminum are all alloyed with other metals to make them harder
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This is because the regular layers in a pure metal are distorted by differently-sized atoms in an alloy
Carefully controlled quantities of carbon and other elements are added to iron to make steel alloys with different properties
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Examples of Steels are:
High carbon steels = Very hard, but brittle
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Glass, Ceramics and Composites
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Borosilicate glass is made from sand and boron trioxide, and melts at a higher temperature than soda-lime glass
Composites are usually made of two materials, with one material acting as a binder for the other material, improving a desirable property that neither of the original materials could offer alone
Soda glass is made by heating a mixture of sand, limestone and sodium carbonate
Rusting
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Sacrificial protection provides protection against rusting, even when the iron is exposed to air and water
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The iron needs to be attached to a more reactive metal such as zinc, magnesium or alumium
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