Material science
Name 3 ways of classifying materials
- According to their composition
- According to their use
- According to their origin
What kind of atomic bonding is present in metallic materials?
Metallic bonding
What is the chemical composition of ceramic elements?
What kind of atomic bonding can we find in polymers?
Covalent bonding
Where can we find composite materials?
In many industries:
- Automotive
- Aerospacial
- High-end sport equipment
- Infrastructure
What is standardization? Name two standardization agencies
Standardization is the process of implementing and developing uniform guidelines or specifications to ensure consistency, quality, and efficiency.
AENOR (spain) and ISO (international). Others: ASTM (USA), DIN (Germany), UNF (France), etc.
What is an alloy?
An alloy is a solid solution formed by a metal and another element called alloying element. It can be another metal or a non-metal. I.e: steel is an alloy of iron and carbon
True or false. Ceramic materials are poor electrical conductors.
True. Ceramics are often used as electric insulators.
Explain the molecular estructure of polymers.
Polymers are long chain formed by thousands of repeating units called monomers.
Name 2 disadvantages.
They are usually more expensive than "singular" materials.
Reparing or recycling is harder.
Less likely to detect defects.
Sensitive to high temperatures.
Which are the different categories of properties? Give an example of each.
- Physical properties: thermal conductivity
- Chemical properties: corrosion
- Mechanical properties: elasticity
- Technological properties: weldability
It is the main disadvantage of metallic materials.
Corrosion.
What is the main disadvantage of ceramics?
Their brittleness.
The main two disadvantages of polymers are....
Low resistance to heat and UV radiation
What can you say about composite materials properties?
Properties depend on the materials used. We can tailor the properties depending on the performance we seek.
Briefly explain the materials tetrahedron.
- Processing
- Structure
- Properties
- Performance
Name 3 characteristics of metallic materials
- Good electrical and thermal conductors
- Durability
- Ductility
- Malleability
- Etc
Why space shuttles have a Ceramic Shield?
Ceramics are very good thermal insulators and the Ceramic Shield would prevent the shuttle to burn during its re-entry into the atmosphere
Name 3 properties of polymers
- Excellent electrical insulation
- High plasticity
- Low density
- Resistance to corrosion
What are the two structural components of a composite material?
The two primary structural components are the matrix (the continuous phase that binds the material) and the reinforcement (the dispersed phase that adds strength and stiffness).