Ceramics

Question 1

What can be said about the atomic packing of Crystalline and Noncrystalline materials?

Answer 1

Crystalline - atoms pack in periodic, 3D arrays

Noncrystalline - atoms have no periodic packing

Question 2

What are the 3 forming methods?

Answer 2

1. Pressing (die pressing, isostatic pressing)
2. Casting (slip casting, tape casting)
3. Plastic forming (extrusion, injection moulding)

Question 3

What is the production process for ceramics?

Answer 3

1. Powder
2. Mixing
3. Forming
4. Shaped Powder Form (Green Body)
5. Firing
6. Dense Polycrystalline Ceramic

Question 4

What are 4 important microstructural features?

Answer 4

1. Grain size
2. Shape of grains
3. Volume fraction of phases
4. Porosity

Question 5

What are bioceramics?

Answer 5

Ceramics and glasses that are biocompatible with human tissue and that are placed in the body to replace a function

Question 6

Why cant ceramics be cast like metals?

Answer 6

Their high melting points, typically formed from powders?

Question 7

How is the strength of ceramics materials characterised?

Answer 7

Bend testing