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