Part 12: Ceramics

Question 1

Which atoms tend to be larger: the cation or anion?

Answer 1

Anion

Question 2

What is a frenkel defect?

Answer 2

Cation moves into interstitial site

Question 3

What is a schottky defect?

Answer 3

Missing anion and cation pair

Question 4

Can anions move into an interstitial site?

Answer 4

No, anions tend to be larger than cations. Thus, they are too large for those spaces.

Question 5

What is the stoichiometric?

Answer 5

Ratio of cations to anions

Question 6

What are the three point defects that ceramics can contain?

Answer 6

1. Interstitial cation
2. Cation vacancy
3. Anion vacancy

Question 7

What are some properties of diamond?

Answer 7

• Hardest material
• Chemically inert
• High thermal conductivity
• High modulus of elasticity
• Low density
• Low coefficient of friction

Question 8

Graphite is anisotropic. What is anisotropic?

Answer 8

Different properties in different directions

Question 9

Name five methods of forming glass:

Answer 9

1. Pressing
2. Blowing
3. Drawing
4. Sheet forming
5. Fiber forming

Question 10

Name four methods of 3D printing ceramics:

Answer 10

1. Ceramic jet printing: rolling spreads powder which is solidified by inkjet head
2. Stereolithography: UV laser solidifies powder
3. Polymer derived ceramics: UV solidifies each layer
4. 3D clay extrusion: printer head pushes a filament into shape