Gallery, Projects and General > Mod-Ups!
Case Hardening Experiments Mod-Up
SwarfnStuff:
Hi all, I know we are looking for a cheap use at home method but has anyone tried this,
"Cherry Red DIY surface harding powder. 400gm/14 ounces"?
I came across it searching Ebay for "Case Hardening".
Don't add "powder" to the search string or you get lead into all sorts of guff. :Doh:
vtsteam:
I haven't tried it, Swarf, but it is the third of the MSDS pdfs I attached above.
tom osselton:
Came across this by powderkeg.
http://madmodder.net/index.php?topic=4603.0
Here is one that is also good and talks about how to harden specific parts of the piece.
http://bbs.homeshopmachinist.net/threads/59717-Case-hardening-success
SwarfnStuff:
Thanks Steam, I admit to not looking at the MSDS pdf's as I am not intending to do any hardening soon. Interesting though to look now, as the product is sold as, "non toxic". MSDS starts with warnings that it causes irritation to Eyes, Lungs, Skin, and gut. Fair enough to take safety precautions with any chemical anyway. Being in the textile dyeing game many years ago, chemicals were handled with gay (the old definition :lol:) abandon in my day - now we or should I say "I" know better hopefully. My son is into woodwork and I am impressed with him talking to his children whenever they come into the workshop about the No 1 rule "Be Safe".
Will_D:
--- Quote from: vtsteam on May 23, 2015, 05:13:50 PM ---Mine is grey.
--- End quote ---
Thats exactly as I remeber it.
It is obviuosly a mixture of things there are white crystals and at least on black powder. There seems to be no yellow at all.
The MSDS sheet is very misleading as it only list the potassium Ferrrocyanide and gives the (incorrect) formula for the Sodium salt (they ignore the nitrogen atoms attatched to the carbon [the cyanide group!!])
Reading through my machinery handbook they give a few recipes that use Cynaide for colour case hardenning (usually the Potasium Salt). They also state that if the colours are too rich leave out the cyanide!
So will WE!
I think then you should try a 50/50 mix of
Bonemeal Fertiliser (from a garden centre)
Crushed wood charcoal.
Maybe if you have some Borax (used as basis of silver soldering fluxes) add about 10% of that. This should glassify and help the powders to stick to the metal
You need to pack the metal and the above mix into a loosley sealed box, or better (they say) into a piece of iron pipe closed at one end. Put all into fire at dull red heat for several hours. Case hardening is a slow process. At end take out and quench in water!
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