Take care to avoid corona. They can drain significant energy from your setup...
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The temper color reveals steel...
measure the actual volume and find the density and see if the density is correct
they are weakly magnetic to my 50x20mm super magnet.
The weak magnetism is very likely due to nickel or cobalt that are used as binders.
The density test is quite definitive. You cannot change the density.
Not sure how to obtain actual volume.
Cemented cobalt would have likely been ground off with the sander also...
The bit displaces ~29g of water...
Drop the object in a vial containing water. The rise of water level tells you volume of the object.
Or, start with water level at the top. Drop in the object and the amount that overflows tells you the volume. Or else gauge the volume by the amount of water needed to refill the vial.
Not quite correct.
You start with WC in the powder form. You cannot melt or cast that stuff. The powder is mixed with nickel or cobalt as binder. Then it is sintered (high temp and pressure) but I do not have the details.
Even tungsten wires are made like that- the metal is obtained in the form of powder and then it is sintered into a rod and the rod is drawn into wires. At no stage the metal is melted.
The binder is quite small- perhaps less than 10% and can be dissolved away with nitric acid. Regular steel will fully dissolve in nitric acid. But this is a destructive test.
All WC bits or buttons or any other stuff must have some binder present. It can be ground only with diamond powder or tools.
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That makes the volume as 29cc. The mass was reported 355gm. The density works out as 12.2g/cc which rules out iron or any iron alloy. Official density of pure WC is 15.6 but that is without any binder.
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