Методические указания Новосибирск

What are the properties and uses of metals? Fill in the appropriate part of the table

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• Now listen to the text and add new information to your notes.
• Material Properties Uses 1
• Material Properties Uses 7
• 6.16. Discuss with a partner the following
• 6.18. Translate the text into Russian. Answer the question after the text. Composite Ceramics

6.13. What are the properties and uses of metals? Fill in the appropriate part of the table. Materials Properties Uses Metals Non-metals Now listen to the text and add new information to your notes. 6.14. Make a list of properties of non-metals keeping in mind that they are opposite to the properties of metals. Listen to the text about non-metals and complete the table. What are metalloids? 6.15. Read the information in the table and find out which material (1-10) is best for: a) water pipes b) a knife for cutting a microscope lens c) connecting a socket to the electricity supply d) a bicycle frame e) television casing Material Properties Uses 1 aluminium light, easy to shape aircraft, window and door frames, cooking foil 2 brass doesn't rust in contact with air and water, strong valves, taps 3 cement mixed with water it dries to a hard material pre-made building blocks, to hold bricks together 4 copper easily made into wire, carries electricity well electrical wire, tubing 5 diamond hardest natural material, can cut glass and metal industrial cutting and grinding 6 glass clear, hard, breaks easily windows, bottles Окончание таблицы Material Properties Uses 7 iron hard engineering 8 mild steel (iron + 0.15–0.3% carbon) hard, strong, quite easy to shape bridges, ships, cars 9 optical fibre carries light and coded messages lighting, cable TV, telecommunications 10 plastic light, strong, easy to shape hard hats, telephones, boats, computer casing 6.16. Discuss with a partner the following: What properties should materials used in medicine have? Why? 6.17. Listen to the dialogue about materials used for body implants and answer the following questions: 1. What properties are important for them? 2. Which of them have been included in your list? 3. Which materials were recommended? Why? 6.18. Translate the text into Russian. Answer the question after the text. Composite Ceramics Advanced ceramic materials have such interesting properties that mechanical engineers are becoming more and more interested in their use as structural parts. Ceramic cutting tools have been in use for some time. However, it is only during the last twenty years that there has been rapid development in this field because of the development of new composite ceramics. Composite materials are materials in which two or more different substances, such as metals, ceramics, glasses, or polymers are combined without chemical reaction. As a result one can produce a material with properties different from those of any of the individual constituents. The constituents of a composite would retain their individual characteristics. Recently engineers have developed various kinds of composite ceramics which must combine an increased toughness with the same hardness and strength of usual ceramics. A promising recent development is the addition of a tiny quantity of metal to increase toughness and tool life. Thus, at room and high temperatures (1000°C) the composite ceramics for cutting tools should possess the following properties: high strength, high toughness, high hardness, high thermal shock resistance and high chemical inertness. Where can materials with such properties be used? жүктеу/скачать 1.6 Mb. Достарыңызбен бөлісу: