Podcast Beta
Questions and Answers
Examples of ceramic materials include ______, porcelain, and many minerals.
glass
Atomic materials with very high strength under compression, low ductility and are usually ______ to heat and electricity.
insulators
Polymers are typically ______ and thermal insulators.
electrical
Conducting polymers can be obtained by ______.
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Composite materials are multiphase materials obtained by artificial combination of different materials to attain properties that the individual components cannot ______.
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An example of a composite material is a lightweight brake disc obtained by embedding ______ particles in Al alloy matrix.
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Materials that can sense changes in their environment and respond accordingly are known as ______ materials.
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The classification of materials can be based on their ______.
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Ceramics, polymers, and composites are examples of ______ materials.
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Nanomaterials are classified based on their ______.
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Metals, ceramics, polymers, and composites are the four basic types of ______.
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The term 'nano' in nanomaterials denotes that the dimensions of these entities are on the order of a ______.
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Metals are characterized by high thermal and electrical ______
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Pure metals are not good enough for many applications, especially structural applications, thus metals are used in ______ form
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Ceramics are usually made either of oxides, carbides, nitrides, or silicates of ______
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One can classify materials based on many criteria, for example crystal structure, or properties, or ______
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Metals are opaque to light and appear shiny if ______
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Materials science enables engineers to understand the limits of materials and the change of their properties with ______
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Study Notes
Materials Classification
- Materials are classified into groups based on criteria such as crystal structure, properties, or use.
Metals
- Characterized by high thermal and electrical conductivity, strong yet deformable under mechanical loads, and opaque to light.
- Atoms are bound together by metallic bonds, with valence electrons detached from atoms and spread in an electron sea.
- Pure metals are often used in alloy form to improve desired qualities (e.g., aluminum, steel, brass, gold).
Ceramics
- Inorganic compounds made of oxides, carbides, nitrides, or silicates of metals.
- Atoms (ions) behave like positive or negative ions and are bound by strong forces between them.
- Characterized by high strength under compression, low ductility, and are usually insulators to heat and electricity (e.g., glass, porcelain, minerals).
Polymers
- Consist of molecules with covalent bonding within each molecule (thermo-plastics) or a network of covalent bonds (thermo-sets).
- Based on H, C, and other non-metallic elements.
- Typically amorphous, with the exception of a minority of thermoplastics.
- Electrical and thermal insulators, but can be made conducting by doping or using conducting fillers.
- Decompose at moderate temperatures (100 – 400°C).
Composites
- Multiphase materials obtained by combining different materials to attain properties individual components cannot achieve.
- Example: lightweight brake disc made by embedding SiC particles in an Al alloy matrix.
Smart Materials
- Can sense changes in their environment and respond in predetermined manners, similar to living organisms.
- Being developed for use in sophisticated systems with traditional materials.
Nanomaterials
- Classified based on size, with dimensions on the order of a nanometer (10–9 m), typically less than 100 nanometers in diameter.
- Can be metals, ceramics, polymers, or composites, but distinguished by their size rather than chemistry.
- Have fascinating properties and tremendous technological promise.
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Description
This quiz covers the classification of materials in engineering, including selecting materials based on cost and performance, understanding material limits, and creating new materials with desirable properties.
