Hardening the cutting edge of the knife with graphite
I will tell and show you the easy way to temper any knife at home. And then, I will not harden the whole knife, but only its cutting edge, which greatly simplifies the task. If you go into details, then rather, it will not be hardening, but rather cementation, which aims to increase the hardness and wear resistance of the metal.Passing along the edge of the file, while paying attention to the dull sound and easy grinding of metal. Everything indicates that the knife is made of ordinary steel and is not previously hardened.For hardening, you need graphite. It is best to get graphite from graphite brushes of a generator, a brush-type electric motor. Of course, I did not try it, but you can also get graphite rods from finger batteries, simple pencils. In general, we grind this graphite into powder in any way.It is not necessary to shallow much, without fanaticism.Next, I need a metal base on which the graphite powder will lie. I took a piece of galvanized profile from drywall.The process of hardening the edge of the knife also requires a power source. Ideally, this is a pulsed DC welding machine set to a minimum. You can also try to repeat the process with the help of another source, 30-60 volts AC or DC. There is still a dangerous option: to use directly the 220 V network, in series with the incandescent lamp, but this is already fraught, so I do not recommend it.
Hardening of the cutting edge of a knifeTake a knife.
Result of hardening the knife
Take the file and shuffle the blade like the first time. Immediately heard a ringing sound, indicating a high hardness of the metal.Plus, the edge is practically impossible to process.
Cutting a glass jar.
Notching leaves be healthy! Knocking on a steel nail.
The result is excellent - there is no scratch on the knife.
At the end, I cut the nail with a knife, hitting it with a hammer.
The knife was not injured! I am not a great expert in the hardening of steel, but the way really works clearly. Local craftsmen say that such hardening increases the hardness of the metal to almost 90 units. I can not disagree or refute, since there is no hardness tester. If you have questions or suggestions, as well as comments, write in the comments.
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