Page 31 - Curriculum Visions Dynamic Book

 The heat given out of the exhaust ports of this jet engine gives you a vivid idea of how important it is to have materials that can resist heat and also the force of the exhaust gases.
alloy: a mixture of a metal and various other elements.
ceramic: a material based on clay minerals which has been heated so that it has chemically hardened.
 Although most blades in turbine engines
are still made of special steel, especially those containing the strong, light metal titanium,
new technology is making it possible to design ceramic blades that will stand up to high temperatures better than metal blades. One such ceramic blade is shown in the centre of this picture; the other blades are made of metal.
Titanium turbine blade
Ceramic turbine blade
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