Different metals Flashcards
Why is nickel used for plating
because it has high corrosion resistance
Nickel has a large market in
superalloys
the presence of consular grains increases
ductility
why is nickel used for implants?
because of high corrosion/ ( low reaction with fluids like blood)
melting furnaces for non-ferous metals
nergy sources. 1. electric (induction, resitance heating, hybrid. 2. Fuel fired: Natural gas, oil, propane,
Furnace types
- fixed linings( induction) , crucible furnaces, reverberatory furnaces, zinc melters
Box style induction
Intensity of strirring determined by size of the furnace, the power input, and the frequency of the electromagnetic fields. Disadvantage: one fixed lining in the furnace.
it has low slag formation.
Electric resistance furnaces
conductive heating heats up the crucible and the metal inside. crucibles within coils. Crucible conducts heat
Very efficient, low cost metling.
advantage of Electric resistance
very efficient, low-cost melting.
Why do metal rods turn hot red?
due to the electrical resistance.
Crucible
open-hearth furnace
Gas-fired flame heats the roof and walls, radiating heat into the center of the furnace, melting.
Used for large volumes.
Zinc Melters
Indirect gas or electric gas
. Used as melting and holders for alloys
Anodizing
The process involves coating a metal with an oxide layer. Metal is inserted into an electrolyte bath where current is passed through it and oxides the surface. Metal acts as an anode. increases factors like corrosion resistance and durability.
the longer the metal is left in a carburizing oven
the deeper and more dense the cabron layer will become.
