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Metals

Metals, plastics and woods

QuestionAnswer
What are the properties of ferrous metals They contain iron, they rust and are magnetic
What are the properties of non-ferrous metals They aren't magnetic, they tarnish and oxidize and don't contain iron
Name some ferrous and non-ferrous metals Ferrous - Steel, Non-ferrous - Gold, Aluminum, Silver
What are alloys and why do we use them Alloys are a mixture of 2 or more metals or substances. We use them to get the properties of both substance and the best of both worlds
Name some alloys and their ingredients Steel - Iron, Carbon. Solder - Lead, Tin. Brass - Copper, Zinc. Brass - Copper, Tin.
What is corrosion It is when metals are left in open air and are exposed to the elements
How can we prevent corrosion Clear coat of lacquer, Painting, Power coating, Anodizing and galvanizing.
What is Galvanizing It is when a layer of zinc is put on the material
What are thermo-plastics Thermo-plastics have the ability to be heated and shaped and then re- heated and remoulded. They never SET allowing a lot more freedom to experiment with shapes.
What are thermo-setting plastics Thermosetting plastics SET after they are heated. They go through a chemical change when they are heated and this cannot be reversed. If you try to reheat these they will burn instead of melting.
What are some thermo-plastics and their uses Acrylic- (Perspex). Used in the metalwork room. Polyethylene – Used for shopping bags and buckets. Polyvinylchloride – (PVC) Used for windows and guttering on a house. Nylon – Used for gears and bearings or bushings
What are some thermo-setting plastics and their uses Bakelite – this was the first true synthetic plastic. It is used on electrical fittings and saucepan handles. Polyester Resins – these are often reinforced with glass fibre which improves their strength a lot.
What are the 3 types of wood and name their examples Hardwood - Oak, Ash, Mahogany Softwood - red deal, white deal, larch Manufactured board - MDF (Medium density fiberboard), block board, chip board.
Created by: georgejoseph
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