MATERIAL TYPES PROFESSIONAL ENGLISH IN USE FOR ENGINEERING

 

PROFESSIONAL ENGLISH IN USE FOR ENGINEERING UNIT 11. MATERIAL TYPES

 

A Metals and non-metals Engineering materials can be divided into: ·         Metals-examples of metallic materials are iron (Fe) and copper (Cu). ·         Non-metals – examples of non-metallic materials are carbon (C) and silicon (Si). B Elements, compounds and mixtures With regard to the chemical composition of materials – the chemicals they contain, and how those chemicals are combined – three main categories can be used: ·         Elements are pure materials in their most basic form. They cannot be broken down into different constituents (‘ingredients’). Examples of elements widely used in engineering materials are iron, carbon and aluminium (Al). C Composite materials The article below is from an engineering journal. EXERCISES 11.1 Complete the sentences using the words in the box. Look at A opposite and Appendix IV to help you. metal non-metal metallic non-metallic ferrous non-ferrous 1. Carbon (C) is a ________________. 2. Copper (Cu) is a ________________ metal. 11.2 Decide whether the sentences are true or false, and correct the false sentences. Look at B opposite to help you. 1. The elements that make up a compound are chemically bound. 2. Alloys are chemical compounds that are frequently used in engineering. 11.3 Complete the extract about concrete and steel, using suitable forms of the word reinforce from C opposite. Sometimes there is more than one possible answer. (1)____________ concrete is one of the most widely used construction materials, and one we take for granted. However, using steel bars to (2)____________ concrete structures located 11.4 Read the text below and find two elements, two compounds, an alloy and a composite. Look at A, B and C opposite to help you. CHEMICAL ELEMENTS

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