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material science unit 2 task 2

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Types of materials Metals and alloys: iron, copper, aluminium, steel. Structure of metals: The atoms in metals are closely packed; they fit as many atoms as they can in one bulk of metal. Each atom is attached to 6 other atoms in its outer layer e.g. Composition: Metals are composed of atoms and in those atoms there are Electrons, Protons and Neutrons, in every atom there usually are the same number of neutrons and electrons, but the numbers of protons differ as some atoms have one more proton then electrons and neutrons. E.g. iron Properties: Chemical properties: They have 1-4 atoms in their outer shell. They loose electrons easily (low ionisation potential) They give away their electrons easily (reducing agents) They have hydroxides that react as both weak acids and bases (amphoteric). They have the tendency to loose electrons than gain them. (Electropositive). 82 elements in the periodic table may be classed as metals. Physical properties 1. They have a metallic shine 2. They diffuse light. 3. Excellent conductors of heat and electricity 4. Very strong 5. Dense - heavy for their size 6. Pliable and ductile (high plasticity) they can be made in to thin wires or hammered in to thin sheets of metals. 7. Resistant to fracture, not easy to break 8. Atoms are arranged in a constant structure. 9. High melting point 10. They rust away or corrode easily. 11. Loose electrons. Uses As Catalysts. Used in electrical wiring. Structure: used to build buildings, bridges, rods. Also used to build cars and their body parts e.g. rims, doors, engines, body. ...read more.


6. Used to make biodegradable product like disposable food packaging, plastic knives, Forks plates and spoons. 7. Biomaterials ( bionate, bio span) 8. Liquid crystals. 9. Teflon 10. Synthetic oil and grease 11. Gaskets and cords. 12. soaps and surfactants (substances used to reduce the tension of a liquid in which the surfactant dissolves) 13. Used to make shoe soles, hoses, and radiator hoses wet suits. Composites: fibreglass, plywood laminates flooring Structure: There are 2 or more types of material in a composite, one of those materials is used as the main substance that holds the whole structure together and the rest are used as reinforcements in a form of fibres. The main types of matrix (main material) are substances like epoxy and polyimide. Composition: Composed of two or more organic or inorganic materials e.g. metal/polymer or polymer/polymer. This material is made of compounds and elements, it is a complex substance. E.g. play wood. The reinforcement materials in composites are mostly made up of fibres. Properties: Chemical properties: 1. High melting point. 2. Resistant to all acid and alkali chemicals. 3. The properties of composites, change as the amount and type of material that they are made from changes. 4. Low modulus 5. Self-abrasiveness if not cared for correctly, therefore making it less strong. Physical properties: 1. The properties of these materials depend up on the type and amount of materials used to make the product. 2. Light weight. 3. High strength. 4. Fireproof 5. ...read more.


Used to make concrete for high ways and streets Polymers Properties Uses Low melting points. Synthetic oil and grease Poor conductors of electricity. Gaskets and cords. Very elastic. Used to make cases for computers, bags and razors. Good plasticity. Used to make containers like plastic plates, cups etc... Poor conductors of heat Teflon Water resistant Used to make glue. Used to make waterproof materials. Used to make wet suits Chemical resistant Soaps and surfactants. Soft to touch Used to make textiles to cover sofas and clothe (NYLON, POLYESTER) Corrode easily Used to make biodegradable product like disposable food packaging, plastic knives, Forks plates and spoons. Composites: Properties Uses Light weight DVD cases and fire doors. High strength Body part for cars. Fire proof Fuel pumps and quips Poor conductors of electricity Insulators. Poor conductors of heat. Meat containers (keep the meat cool until it reaches it destination.) Chemical resistant Chemical storage tanks Good weathering properties Pipes, chimneys, Transmits light and its also Versatile. Boat hulls Malleable and ductile Translucent mouldings and sheets Natural fibre Properties Uses High absorption. Easy to sew and handles well. Towels, kitchen cloths, bandages, plasters Soft in hand. Children's wear, underwear High control of colour (keeps its colour for a long time). Shirts, trouser, beddings, Machine washable and dry cleanable. Bedding, table mats Easy to print on. Pants, t-shirts, sheets Strong and thin textile. Jackets, mouth masks Drapes well (it holds itself loose around objects or the body of some thing) Blouse, curtains, scrubs, Low elasticity. Sock, shirts, Low temperature resistance. Skirts, suits http://web.buddyproject.org/web017/web017/metals.html-5 http://www.mse.uiuc.edu/info/mse182/t46.html http://www.composites.co.nz/chemicalresistance.htm http://www.swicofil.com/products http://www.corrosionsource.com/handbook/periodic/metals.htm 1 http://www.kcpc.usyd.edu.au/discovery/glossary-all.html#97 2 http://science.howstuffworks.com/question547.htm ?? ?? ?? ?? Task 2 AO2 UNIT 2 material science Zohreh Ketabi 1 of 8 ...read more.

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