Shim Stock for Carbon Potential
Shim Stock for Carbon Potential
(OP)
Anyone have the procedure or a link to the procedure for using shim stock to evaluate carbon potential in an atmosphere furnace?
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Shim Stock for Carbon Potential
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Shim Stock for Carbon PotentialShim Stock for Carbon Potential(OP)
Anyone have the procedure or a link to the procedure for using shim stock to evaluate carbon potential in an atmosphere furnace?
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RE: Shim Stock for Carbon Potential
Using 0.08% Carbon 0.010" thick shim stock.
clean and weigh 0.010" shim stock (or whatever thickness you are using). Weigh to nearest .0001 g (0.1 mg)
This is Initial Weight (IW)
place in furnace for 20 minutes
cool in vestibule under atmosphere to below 1000F
clean and re-weigh shim
This is Final Weight (FW)
The percent increase in weight is
(FW-IW)/FW * 100
But, the initial shim had 0.08% C so,
% C = ((FW-IW)/FW * 100) +.08
Note, generally, the carbon content of the shim stock is unknown, but relatively low, 0.06-0.08. We always used 0.08.
Note 2, we would typically use a 1" by 2" shim (approximate dimensions). IIRC, they nomially weighted about 2.5 grams.
Note 3, care has to be taken on cooling from temperature to prevent oxidation. We had shim vestibules built into furnace.
Note 4, the soak time doesn't really depend on thickness, but is just the amount of time it takes to come to equalibrium. We did trials and found 15 and 20 minute shims to be equal, so we settled on 20 minutes. ymmv.
RE: Shim Stock for Carbon Potential
RE: Shim Stock for Carbon Potential
Just to add, it is important that the shims be clean. Degrease them well and keep them wrapped in clean paper tissue and handle them onlt with clean white gloves to prevent contamination.
RE: Shim Stock for Carbon Potential
ht
Other approaches to Carbon Potential
http://www.furnacecontrol.com/ShimTest.htm
http:/
RE: Shim Stock for Carbon Potential
RE: Shim Stock for Carbon Potential
RE: Shim Stock for Carbon Potential
http://www.lindahall.org/
IH is a very good magazine if you are involved in any type of heating. It use to be free for anyone in the trades.
RE: Shim Stock for Carbon Potential