Ceramics: History and Development
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Questions and Answers

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?

    <p>Ionic bonding in ceramics vs. covalent bonding in polymers</p> Signup and view all the answers

    Why do ceramics typically exhibit brittle failure compared to metals?

    <p>Lack of dislocations in ceramics</p> Signup and view all the answers

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

    <p>Because ceramics have a covalent bond that is directional</p> Signup and view all the answers

    What type of crystal defect is characterized by missing atoms?

    <p>Point defects</p> Signup and view all the answers

    How are dislocations introduced in crystals?

    <p>During solidification or work-hardening</p> Signup and view all the answers

    Why do ceramics exhibit brittle behavior?

    <p>Mutual repulsion between charged ions causes shattering</p> Signup and view all the answers

    What is the main reason why ceramics shatter without bending?

    <p>No ability for slip deformation due to mutual repulsion</p> Signup and view all the answers

    How does defect control manipulate the properties of crystals?

    <p>By adjusting the extent of ductility</p> 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?

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

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

    <p>For failing from the fit surface outwards.</p> Signup and view all the answers

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

    <p>To achieve a captivating smile.</p> Signup and view all the answers

    Why are ceramics considered chemically inert?

    <p>Because they do not react with most chemicals.</p> Signup and view all the answers

    What property of ceramics makes them suitable for dental applications?

    <p>Their wear resistance.</p> Signup and view all the answers

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

    <p>Quartz: SiO2</p> Signup and view all the answers

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