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| Ceramic Pot |
Ceramics :
Clay materials, such as chinaware, porcelain and bricks, are collectively known as ceramics. All these are being traditionally manufactured and used for over several centuries.
The word ceramic is derived from a Greek word ceremos which means earthen pot.
Preparation of porcelain :
The raw materials required for the preparation of porcelain are whit clay, sand and feldspar [K2O AI2O3 6SIO2].
Finely powdered mixture of raw materials are mixed with water.The homogeneous mixture is called slip. Slip is pressed with filter paper to remove excess water. Then the slip is moulded into desired shapes and dried. The dried articles are heated in a furnace at about 1873K.
Remember
Clay is the mixture containing aluminium silicate in high quantities. It is formed by the weathering of silicate rocks by the action of air, rain and corbon dioxide.
The fired articles are porous.
These pores are plugged by glazing.
Glazing imparts an attractive look.
Chemicals like born, alumina and smooth silica the uniform spreading of coat.
Pre-determined quantity of metal oxides are added while glazing.
Which gives desired colour to the porcelain.
Uses of porcelain :
Finely powdered mixture of raw materials are mixed with water.The homogeneous mixture is called slip. Slip is pressed with filter paper to remove excess water. Then the slip is moulded into desired shapes and dried. The dried articles are heated in a furnace at about 1873K.
Remember
Clay is the mixture containing aluminium silicate in high quantities. It is formed by the weathering of silicate rocks by the action of air, rain and corbon dioxide.
The fired articles are porous.
These pores are plugged by glazing.
Glazing imparts an attractive look.
Chemicals like born, alumina and smooth silica the uniform spreading of coat.
Pre-determined quantity of metal oxides are added while glazing.
Which gives desired colour to the porcelain.
Uses of porcelain :
Household articles. Decorative materials. Insulating parts of electric devices. Sanitary items and Laboratory equipments.
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| Porcelain uses |
POINTS TO REMEMBER
Synthetic materials are manufactured by using natural raw materials.
Synthetic materials are plastics, cement, glass, fibers and ceramics.
Polymers are compounds formed by the union of many simple monomers.
Polymerisation is a process of uniting two or more simple compounds to obtain a new compound.
Addition polymerization is a process in which several molecules join together to form a giant molecule.
Polythene, polyvinyl chloride and nylon are examples for polymers.
Plastic is a synthetic material manufactured by polymerization of organic substances.
Synthetic materials are manufactured by using natural raw materials.
Synthetic materials are plastics, cement, glass, fibers and ceramics.
Polymers are compounds formed by the union of many simple monomers.
Polymerisation is a process of uniting two or more simple compounds to obtain a new compound.
Addition polymerization is a process in which several molecules join together to form a giant molecule.
Polythene, polyvinyl chloride and nylon are examples for polymers.
Plastic is a synthetic material manufactured by polymerization of organic substances.
Polyvinyl chloride and polystyrene are thermoplastics.
Bakelite, silicones are thermosettings.
To avoid the hazards of plastics the usage of plastics should be abandon stage b stage.
The raw materials of cement are clay, lime stone.
Gypsum slows down the rapid setting of cement.
The method of hardening of cement by treating with ater is known as curring.
The raw materials used in the manufacture of glass are sand, limestone and sodium carbonate.
The different types of glass are soda glass, borosilicate glass, lead glass.
Coloured glass, safety glass and fiber glass.
The process of slow cooling of glass is known as annealing.
The raw materials of ceramics are whit clay. Sand and feldspar.
Porcelain is used to prepare decorative materials.
Glazing imparts an attractive look and also plug the pores.
Bakelite, silicones are thermosettings.
To avoid the hazards of plastics the usage of plastics should be abandon stage b stage.
The raw materials of cement are clay, lime stone.
Gypsum slows down the rapid setting of cement.
The method of hardening of cement by treating with ater is known as curring.
The raw materials used in the manufacture of glass are sand, limestone and sodium carbonate.
The different types of glass are soda glass, borosilicate glass, lead glass.
Coloured glass, safety glass and fiber glass.
The process of slow cooling of glass is known as annealing.
The raw materials of ceramics are whit clay. Sand and feldspar.
Porcelain is used to prepare decorative materials.
Glazing imparts an attractive look and also plug the pores.
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