BeginnerTopic 1 of 100Materials & Chemical
Classes of engineering materials
Metals, ceramics, polymers, composites and semiconductors have distinct properties.
In depth
Metals are strong, ductile and conductive; ceramics are hard, brittle, refractory and insulating; polymers are light, flexible and easy to process; composites combine constituents for tailored properties; semiconductors enable electronics. Properties follow from bonding and structure.
Key points
- Metallic, ionic/covalent and van der Waals bonding
- Ashby property charts
- Trade-offs among strength, toughness, cost
ExampleA bicycle frame may be steel, aluminium, titanium or carbon-fibre composite depending on priorities.
Each material class has a different balance of strength, weight, cost and temperature limit, so choosing a class is the first materials decision.
What is Classes of engineering materials?
Metals, ceramics, polymers, composites and semiconductors have distinct properties.
Why is it important to understand classes of engineering materials?
Each material class has a different balance of strength, weight, cost and temperature limit, so choosing a class is the first materials decision.
Which material class is usually strongest?
Metals and ceramics are strong, but ceramics are brittle, while metals combine strength with ductility. Composites can be very strong in a chosen direction.
What is a semiconductor in materials terms?
A material whose conductivity lies between conductors and insulators and can be controlled by doping, which makes it the basis of electronics.
How is Classes of engineering materials used in practice?
Typical applications include choosing steel for a bridge and plastic for a housing enclosure, picking a ceramic for a furnace lining and using a composite for a light racing bicycle frame.
What should I learn before Classes of engineering materials?
It is the first topic in Materials & Chemical, so no earlier topic in this course is required.
What are the key points of Classes of engineering materials?
Metallic, ionic/covalent and van der Waals bonding. Ashby property charts. Trade-offs among strength, toughness, cost.
Can you give an example of Classes of engineering materials?
A bicycle frame may be steel, aluminium, titanium or carbon-fibre composite depending on priorities.
What comes after Classes of engineering materials?
The next topic is "Atomic structure and bonding", which builds directly on this one.
How difficult is Classes of engineering materials?
It is classed as Beginner in Materials & Chemical (topic 1 of 100). It is an entry-level topic. It relies only on basic school mathematics and the ideas introduced earlier in this discipline.