Base metal casting alloys

Question 1

what are the 2 base metal casting alloys

Answer 1

Co/Cr
Ni/Cr

Question 2

what is a cocr base metal used for

Answer 2

p denture framework
f denture bases

Question 3

what are nicr base metal alloys used for

Answer 3

applications in crown and bridge

Question 4

how much chromium is in a cocr base alloy

Answer 4

no less than 25%

Question 5

how much chromium is in a nicr metal alloy

Answer 5

no less than 20%

Question 6

fusion temperature of both alloys

Answer 6

1200-1500 degree celcius

Question 7

what is steel composed of

Answer 7

alloy of iron and less than 2% carbon

Question 8

below 723 degrees what 2 phases exist in steel

Answer 8

ferrite
cementite

Question 9

what is the term for a mixture of ferrite and cementite steel

Answer 9

pearlite

Question 10

what gives the eutectoid steel alloy

Answer 10

0.8% carbon

Question 11

what are hypereutectoids

Answer 11

cementite - hard, brittle
- cutting instruments

Question 12

what are hypoeutectoids

Answer 12

ferrite - softer and ductile
- forceps

Question 13

what is stainless steel

Answer 13

steel with an addition of chromium

Question 14

stainless steel composition of denture bases

Answer 14

18% chromium
8% nickel

Question 15

composition of stainless steel probes and cutting instruments

Answer 15

martensitic
no nickel
12% chromium

Question 16

spingback potential of wire

Answer 16

yield stress/ modulus of elasticity