Unit 2 Material Technology Describing specific materials Dr

Unit 2: Material Technology Describing specific materials Dr. Hatem Elaydi Engineering Technical English Islamic University of Gaza Feb. 13, 2016

Language note / Recycling �What is meant by recycling? �How does recycling affect engineering design? Language note �magnetism = force of attraction �galvanized = coated with zinc (Zn) to prevent rusting �recyclable = can be recycled �chromium (Cr) and nickel (Ni) = metals added to steel to make stainless steel �traces = small quantities �scarcity = limited availability /rarity 2 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Language note … �insulation = both electrical insulation and thermal insulation �wire = single strand of metal �scrap = waste material intended for recycling �alloy = a mixture of metals sometimes containing a nonmetal, for example carbon (C) in steel �brass = an alloy of copper (Cu), zinc and, often lead (Pb) �bronze = an alloy of copper and tin (Sn) �melting down = using heat to change the state of a substance from solid to liquid �energy-intensive = using a lot of energy 3 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Language note … �electrolysis = passing an electrical current through a liquid or solid in order to separate chemical compounds �ore = mineral from which metal is extracted �hardwood = timber from deciduous trees �softwood = timber from pine trees �ironmongery = collective term for small metal items commonly used in buildings, for example door handles, hinges, screws, nails. 4 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Independent Reading/ Q 1 a Scrapping cars �A lot of metal, notably steel, can be recycled. Intact parts can be recovered and resold. Oil, brake fluid and battery acid are potential pollutants which need to be disposed of carefully. Tires are more difficult to recycle. Recycling electronics �Heavy metals such as lead, cadmium and chromium are potential pollutants and can also be recovered for recycling. The process of recycling electronic products is quite difficult due to the difficulty of breaking up and separating very small components. 5 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Independent Reading/ Q 1 a … Breaking up ships � Large amounts of steel can be recovered and recycled. Main pollutants are fuel oil from tanks and asbestos which was widely used as an insulation material inside ships. Demolishing buildings � Structural steel can be recycled, concrete can be crushed and reused, for example in asphalt for road surfacing, copper in electrical wires can be recovered and recycled, good-quality bricks can sometimes be cleaned and reused. As with ships, asbestos is often found, requiring special precautions for its removal. The main difficulty is the time taken to demolish buildings meticulously. 6 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

2. A Read the following web page and complete the missing headings using the words in the box. �Aluminum , Copper, Glass, Plastic, Rubber, Steel, Timber Recyclable material 7 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Recyclable material … Answers 2 Glass 3 Copper 4 Aluminum 8 5 Timber 6 Rubber 7 Plastic Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Answers 2 a, 3 b, 4 f, 5 d, 6 h, 7 e, 8 g 9 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

2 C Answers 2 with 3 from 4 from 5 with 10 6 of 7 of 8 from Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Independent work Q 3 �lrina, an ecological adviser, is talking to a group of engineers on a training course about environmentally friendly design. �In Groups, discuss the ideas from her slide and give some examples. 11 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

Independent Work Q 3 b �Use the CDs and Listen to an extract from the talk and compare your ideas with what lrina says. What example does she use to illustrate her main point? �You can read Irina extract in the next two slides. 12 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

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Independent Work Q 3 C lrina asks the engineers to do a simplified environmental audit. Their task is to compare steel and aluminum car bodywork from an ecological perspective. Listen to Sophia and Pete, two of the engineers, discussing the topic and make notes of their ideas. 15 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

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HW: In group, do an environmental audit for the following applications and materials. Use the words and phrases in the box. 21 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

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