Dear all, I'm using pack cemetation method to apply aluminide coating on surface of the alloy with activator NH4Cl, but the pressure of the chamber is not very stable above 800C, so I want to know at what temperature , the HCl react dramatically with FeAl alloy.
Thanks for your help
FeAl alloys had good strength at 700-750{degrees}C[1]. So maybe a temperature above that. I read it is sintered at 1100degrees celcius[2]. Also there is a paper [3] which tells about reaction of HCl with FeAl alloy. Hope these sources and info helps you.
1. worldwidescience.org/topicpages/b/b2+feal+alloys.html
2. espace.library.uq.edu.au/view/UQ:198591
3. www.journalamme.org/papers_amme06/1219.pdf
Thank you very much for your answer, but at high temperature, because of the NH4Cl decompose HCl, N2 and H2, the condition is more complicated. It's not only FeAl react with HCl to form Al(1-3)Cl, but also Al(1-3)Cl react with N2 to form AlN on the surface of the FeAl alloy.
Because what we use is a low pressure closed CVD facility. So we want to maitain a certain pressure inside the champer.
It will be easy to do it by using a open CVD system.
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