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Flashcards in Metals Deck (12)
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1

What are the 7 noble metals?

Gold + RIPPOR

Rhodium
Iridium
Platnium
Paladium
Osmium
Ruthenium

2

Gold
- Melting temp

1337ºC

3

Platnium
1. Melting temp
2. Increases (3)
3. Adds what qualities to Au alloys
4. Decreases (1)
5. Usually what %

1. 2045ºC
2. Increases melting range, coefficient of thermal expansion, strength
3. Adds hardness and elastic qualities
4. Decreases grain size
5. Usually 3-4%

4

Palladium
1. Melting temp
2. Prevents what of Ag?
3. Decreases (1)
4. Increases (3)

1. 1825ºC
2. Prevents corrosion of Ag
3. Decreases grain size
4. Increases strength, toughness, hardness

5

Iridium
1. Melting temp
2. Adding 0.005% does what?
3. Increases (1)
4. Imparts what two properties

1. 2716º
2. Refines grain size (uniform grain size)
3. Castability
4. Hard and brittle

6

What base metals are used in dental alloys? (7)

STING ZC

Silver
Tin
Indium
Nickel
Gallium

Zinc
Copper

7

Silver
1. Melting temp
2. Best conductor of what (2)
3. Stronger and harder than what? (1)
4. Softer than what (1)
5. Severely tarnished by what?
6. Does what to alloy?

1. 1234ºC
2. Heat and electricity
3. Gold
4. Copper
5. Sulfur
6. Whitens alloy

8

Copper
1. Melting temp
2. Increases (3)
3. Decreses (3)

1. 1084ºC
2. Increases strength, hardness, ductility
3. Decreases tarnish, corossion, melting temp

9

Tin
1. Melting temp
2. Combines with Pt and Pd to increase what
3. Not found in % greater than?

1. 505ºC
2. Hardness
3. Not >5%

10

Indium
1. Melting temp
2. Replaces what in some alloys
3. Increases (1)

1. 430ºC
2. Zinc in some alloys
3. Increases castability

11

Zinc
1. Melting temp
2. What unique property?

1. 693ºC
2. Scavenger for oxides

12

High noble classification
Noble
Base metal

A. > = 60% noble and >= 40% Au
B. >= 25% noble
C. =< 25% noble, predominantly base