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Academic Questions in Basic Technology
Which of the following is not a function of thin continuous line in Technical drawing?
The following are Types of Line in Technical Drawing EXCEPT _____.
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Ceramics are simply defined as inorganic and non metallic materials. They can be classified into two types. These are:
They are made completely from clay. We can categorize them into the followings:
As a fix for it's porosity, the resulting product is covered with a waterproof, paint-like substance or 'powdered glass substance' suspended in water. (This substance is called glaze). It is then fired a second time.
Delft and Majolica are examples of earthenware.
Stoneware is non-porous and if glazes were to be used, then it's only for decorative purposes.
The products of stoneware are strong and durable materials which can be used as cooking pots, jugs and plates.
Once made into desired shape, they are fired in a kiln between the temperatures 1,200°C – 1,450°C. It may be decorated with glazes by additional firing.
Note: By characteristics, they are very hard, translucent white ceramic. The image below shows a Procelain:
Procelain is sometimes referred to as fine china because it had it's origin in China.
They are used as vaces, jugs and plates.
They are based on metallic oxides and non-oxides (or combinations of both). Generally, they are not clay based.
The main oxides used in advanced ceramics are aluminium oxide (Al2O3), Magnesium oxide (MgO) and zirconium oxide (ZrO2).
The non-oxides are mainly carbides, borides and silicides; for example, boron carbide (B4C) and silicon carbide (SiC).
In order to produce an advanced ceramics, the oxides are thoroughly grounded to become fine powder. The fine powder is then shaped into a green body fired at a very high-temperature (1,600–1,800°C) in an oxygen-free atmosphere; (and allowing the tiny grains of each ceramic components to join together. This aformentioned process called sintering).
The end result is a very hard, durable and corrosion-resistant product.
Note: Advanced ceramics are used in metal production and electronics.
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