Download
1 / 21
230 likes | 522 Views
Materials Materials and Components. To choose the correct material for any particular task is essential for a manufacturing activity. Materials are divided into natural and artificial Natural resources are split into 3 categories Animal Vegetable Mineral . . Materials.
E N D
MaterialsMaterials and Components • To choose the correct material for any particular task is essential for a manufacturing activity. • Materials are divided into natural and artificial • Natural resources are split into 3 categories • Animal • Vegetable • Mineral • .
Materials • Artificial Materials . • ARE THOSE WHICH HAVE BEEN MADE BY MAN
Materials TYPES OF MATERIALS • 1º Wood: Divided into two major classifications: • Hardwoods and Softwoods • 2º Metals. There are two significant groups of metals: • Ferrous metal: contain iron • Non-ferrous metals: do not contain iron
Materials . • Ferrous metal example
Materials Non-Ferrous metals • Examples of Non-ferrous metals are: • Aluminium • Copper • Gold • Silver
MaterialsPlastic • Made using coal, gas, animal protein or petrol • On the left, Coal and plastic bottles
MaterialsCeramic, Textiles and Glass • Other Materials used in manufacturing activity are Ceramic, textiles and glass
MaterialsProperties of Materials • Properties of materials can be divided into physical,chemical and ecological
MaterialsPhysical Properties • Electrical Conductivity • When electricity can run though the material. • Examples: • Steelis a good conductor • Wood isn't a good conductor
MaterialsPhysical Properties Optical properties: • How materials behave when light touches them • Them can be classified into: • a) Opaque: No light travels through them. e.g wood • b) Transparent: All light travels through them and you can see what's behind the materials. e.g glass of window • c) Translucent: All light can travel through them but you cannot see what's behind them e.g frosted glass • See examples on page 75
MaterialsThermal Conductivity • ¿ What is conductor and what is insulator ? • Plastic handles….. • Metal Body…….
MaterialsThermal Conductivity • . The ability of the material to conduct heat. e.g. Saucepan. Metal body for thermal conductivity and plastic handles for thermal insulation. • Thermal Insulation = It is a bad Thermal conductor
MaterialsThermal properties • . Dilation: • When material expands ( gets bigger ) due to heat • Contraction: • When material gets smaller due to heat • To think about: Why are rails separated by a gap?
MaterialsThermal properties • . Fusibility is the ability of a material to change into a liquid when heated to its melting point. • examples of melting points • Iron´s melting point...........1535 ºC • Copper´s melting point..........1083 ºC
MaterialsSound Properties • The ability of materials to conduct sound • To think about. Can you speak on the moon? • Write some examples of good and bad conductors.
MaterialsChemical Properties • Oxidation. • The change that occurs to most metals when in contact with air or/and water
MaterialsEcological Properties. • Recyclable. Materials that can be reused • Toxic. Materials which are harmful to the environment • Biodegradable. Materials that decompose naturally with time. eg • An apple take about 20 days to decompose • Plastic takes about 100 years • Glass takes about 400 years
Materials • Now, visit this web site • bbc.co.uh
Materials • .
Materials • .
Materials • .
