[Stoves] Surface hardening of steel .

[Frans Peeters]

Dear Crispin,
 
    Surface hardening of steel is done by formation of iron nitrides or
CARBIDS .
For the last ,” CO” is the reactant !
In practice ,you use carbon in a closed box . But the little oxygen
inside the box will be a transporter ,again and again . The moment iron
carbide is formed ,a litlle oxygen is free to form new CO .
For you it looks like the Carbon evaporates .
But the inside oxygen is carrier in a closed box . 
You can test it in vacuum .and no carbide can be formed .
 
    Stainless  18/8 as a catalyst for synthesis might work a little .
Normally a catalyst must have a big surface . So Nickel powder is used
and magnetically recuperated .
Nickel wool .will do .
 Other catalyst is ironoxyde  Fe2O3 powder .
Even CLAY is used for cracking hydrocarbons . DIEZEL to Gasoline .
 
Greetings
Frans

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