ceramics

Question 1

structure of ceramic

Answer 1

regular crystal structure - crystalline

Question 2

4 mechanical properties of ceramics

Answer 2

1. high hardness
2. strong in compression, weak in tension
3. notch sensitive
4. brittle

Question 3

why are porcelains weak under tension and how can this be solved?

Answer 3

porous

vacuum used to reduce porosity

Question 4

3 methods of bonding porcelain to metal

Answer 4

1. thermal contraction
2. mechanical interlocking
3. chemical bonding

Question 5

how does porcelain usually fail?

Answer 5

brittle - crack on fitting surface which propagates through to exterior surface

Question 6

why does veneer fail if cement layer too thick?

Answer 6

cement more flexible, cement bends + veneer cracks