Ceramics: History and Development

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Which type of bonding primarily holds ceramic materials together?

Van der Waals bonds

Metallic bonds

Covalent bonds

Ionic bonds (correct)

What type of structure do ceramics typically exhibit that contributes to their brittleness?

Amorphous structure

Polycrystalline structure (correct)

Fibrous structure

Single crystal structure

Which type of material is likely to exhibit brittle failure?

Ceramic (correct)

Composite

Polymer

Metal

What is a key difference between the primary bonding structure of ceramics compared to polymers?

Ionic bonding in ceramics vs. covalent bonding in polymers Signup and view all the answers

Why do ceramics typically exhibit brittle failure compared to metals?

Lack of dislocations in ceramics Signup and view all the answers

Why do ceramics tend to be hard and have high melting points?

Because ceramics have a covalent bond that is directional Signup and view all the answers

What type of crystal defect is characterized by missing atoms?

Point defects Signup and view all the answers

How are dislocations introduced in crystals?

During solidification or work-hardening Signup and view all the answers

Why do ceramics exhibit brittle behavior?

Mutual repulsion between charged ions causes shattering Signup and view all the answers

What is the main reason why ceramics shatter without bending?

No ability for slip deformation due to mutual repulsion Signup and view all the answers

How does defect control manipulate the properties of crystals?

By adjusting the extent of ductility Signup and view all the answers

What was the significance of Ehrenfried von Tschirnhaus and Johann Böttger's European 'porcelain discovery' in the early 1700s?

They found that fusing mixed oxides in combination was crucial for porcelain production. Signup and view all the answers

Why did Land (1903) mention that dental crowns broke easily?

For failing from the fit surface outwards. Signup and view all the answers

What was the main reason Pincus (1938) highlighted for the importance of having natural, gleaming white teeth?

To achieve a captivating smile. Signup and view all the answers

Why are ceramics considered chemically inert?

Because they do not react with most chemicals. Signup and view all the answers

What property of ceramics makes them suitable for dental applications?

Their wear resistance. Signup and view all the answers

Which element's importance was highlighted in the production process of porcelain according to the text?

Quartz: SiO2 Signup and view all the answers

Ceramics: History and Development

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