After completing this topic you should be able to : State ceramic materials made from compounds of a metal and non-metal and are made by the action of.

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Presentation transcript:

After completing this topic you should be able to : State ceramic materials made from compounds of a metal and non-metal and are made by the action of heat and followed by cooling. Give examples of everyday ceramic materials. Give examples of new ceramic materials and their properties. Give examples of new polymers with special properties and their uses.

Clay has been used for thousand of years to make bricks, pots and jars. Clay is moulded to manufacture the item, then left to dry. However, at this stage the clay is weak, porous and absorbs water. The clay item is then heated to a high temperature (1000 o C) in a kiln. This stage is called “ ““ “firing the clay”. Firing the clay removes more water from the clay and alters the structure of the clay. Before firing, the unfired clay can be painted with a coating called a glaze. This gives a decorative finish to the clay.

Ceramic materials can be coated onto metals to make cookware. This makes an attractive non-stick surface, which is hardwearing. A c cc ceramic knife is made out of a hard tough ceramic, z zz zirconium dioxide (ZrO2 this is also called z zz zirconia). The blade is sharpened by grinding on a diamond-dust-coated grinding wheel. The blade is harder than a steel blade and rarely needs sharpening.

Ceramic materials can be found in cars. Catalytic converter to reduce pollution. The spark plugs in the engine. Materials of the brake pads, which give better wear. The clutch plate as part of the gearbox. Ceramic materials are lightweight, strong, hard-wearing and can withstand high temperatures.

There are number of polymers which have been developed which have properties which would not be expected. A h hh hydrogel is a polymer, which can a aa absorb a large quantity of water, but once absorbed it does not give the water back. A h hh hydrogel polymer is used in disposable nappies. Plant storage crystals are hydrogels. They absorb water and swell up. If put in plant tubs and hanging baskets they slowly release water extending the time between watering's, for example when you go on holiday. Soft contact lenses are h hh hydrogels. Their ability to absorb water means they don’t dry out in use, and are compatible with tears which lubricate the eye making them more comfortable to wear.

Polyvinyl alcohol (PVA) is a w ww water-soluble polymer. It is used as an adhesive. As a film it is used to make the packaging of “liqui-tabs”, which hold detergent for dishwashers and washing machines. Polylactic acid (PLA) is made from corn or sugar cane. It is used to make disposable cutlery, waste sacks and sutures used for internal stitches in the body during surgery. Bioplastics are biodegradable.