dental alloys

Question 1

what is the definition of alloy

Answer 1

aggregate of 2 or more metals in all possible combination

Question 2

how do metal alloy solidify

Answer 2

they are mutually soluble when molten, solidify over a range of temperature, within soliification temp range, 2 phase(solid and liquid) exists

Question 3

for interstitial solid solutions, which atom diameter is bigger, the solute or the solvent

Answer 3

solute

Question 4

What is solvent

Answer 4

the metal whose space lattice persists

Question 5

for substitutional solid solutions, which metal atom diameter is bigger, the solute or the solvent?

Answer 5

both are similar atom diameter. Random substitution

Question 6

what is a super lattice

Answer 6

atoms of one metal occupy specific positions in space lattice of other metal, ordered substitution

Question 7

what is an example of ISS

Answer 7

C atoms and larger Fe atoms

Question 8

what is an example of SSS

Answer 8

palladium and silver atoms

Question 9

what is an example of super lattice

Answer 9

gold and copper 50.2% gold, 49.8% copper

Question 10

what are the factors determining extent of solid solubility

Answer 10

1. atomic size of atoms
2. valence atoms
3. chemical affinity
4. lattice type( metals w same type of lattice form ss)

Question 11

what are the effects of alloying

Answer 11

results in localised distortion of lattice–> slip becomes more difficult

Increases mechanical strength, proportional limit, hardness

decreases ductility

Question 12

what are eutectic alloy

Answer 12

alloy that have complete solid insolubility. Complete liquid solubility limited solid solubility

Question 13

what is the eutectic point

Answer 13

the point where liquidus and solidus meet, it is the lowest temp where it is entirely liquid.

Question 14

what are intermetallic compounds

Answer 14

atoms of 2 or more metals combined in a fixed ratio, producing crystal different in structure from individual metals