Basic Technology

Ceramics: Types of Ceramics

len Alfred Ajibola - Sat, 30th May, 2020 @ 13:10: PM

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Academic Questions in Basic Technology

Please check out our Test Your Knowledge page to see all Questions and Answers

The followings are characteristics of ceramics except _____.

  • A. They readily undergo oxidation

  • B. They have high melting point

  • C. They are durable

  • D. Most are insulators but graphite is a conductor of electricity

  • E. Most are non-magnetic

  • F. They have great tensile strength but graphite is soft

Which of the following statement is false of ceramics?

  • A. They are not metals

  • B. They are not plastics

  • C. Ceramics can be absolutely defined by its products characteristics

  • D. Ceramic materials are not organic in nature

  • E. Ceramics are refractory in nature

  • F. Ceramics materials are usually made from clay

Which of the following is not a function of thin continuous line in Technical drawing?

  • A. Used for representing projection lines
  • B. Used as construction lines
  • C. Used for representing visible outline and edges
  • D. Used for representing leader lines
  • E. Used as intersection lines
  • F. Used as measurement lines

The following are Types of Line in Technical Drawing EXCEPT _____.

  • A. thin continuous line
  • B. inverse head line
  • C. thin dash line
  • D. continuous thin straight zigzag line
  • E. free hand line
  • F. chain thin line with thick ends



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Types of Ceramics:

Ceramics are simply defined as inorganic and non metallic materials. They can be classified into two types. These are:

  1. Traditional Ceramics
  2. Advanced Ceramics

Please read on an Introduction to Ceramics and it's characteristics here.

Traditional Ceramics

They are made completely from clay. We can categorize them into the followings:

  1. Earthenware: These are clay fired at a fairly low temperature of about 900°C – 1,150°C. The result is the formation of a partially porous and rough object. They are shown below:

    Earthenware Ceramics - Len Academy

    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.

  2. You can read on Hardwood and Softwood, Characteristics and Examples here.

  3. Stoneware: They are clay fired at a temperature of about 1,250°C until they become vitrified, that is; glass-like. The image below shows the glass-like ceramics (stonware):

    Stoneware Ceramics - Len Academy

    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.

  4. You can read on Maintenance and Types of Maintenance here.

  5. Porcelain: They are made from kaolin clay, glass, granite, feldspar and water.

    Please read on the Types of Rocks here.

    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 Ceramics - Len Academy

    Procelain is sometimes referred to as fine china because it had it's origin in China.
    They are used as vaces, jugs and plates.

Test you knowledge on various academic subjects here.

Advanced Ceramics

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).

Advanced Ceramics - Len Academy

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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Alfred Ajibola is a Medical Biochemist, a passionate Academician with over 7 years of experience, a Versatile Writer, a Web Developer, a Cisco Certified Network Associate and a Cisco CyberOps Associate.

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