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Sp17 Fixed IV > Materials > Flashcards

Flashcards in Materials Deck (6)
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1
Q

Grain refining affect on metal

A

Hard and less ductile

2
Q

Types and hardness

A

1: soft: inlay
2: medium: inlay
3: hard: crown/bridge
4: extrahard: Crown/birdge

3
Q

Very high noble metal
High
Noble

A

80% gold
60% noble 40% gold
25% noble

4
Q

How do ceramic failures occur

A

All occur in tension

5
Q

Raising and lowering porcelain melting point

A

Silica glass: higher
Modified silica: lower
NA, K, Ca, F lower by breaking up silica

6
Q

stuff

A

Sintering: powders drawn together leading to shrinkage
Fritting: mixed and melted to make good composition
Solid solution hardening and grain refining: Elasticity and hardness