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High Temperature coating
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Source：Internet Author：Unknow Pubdate：2010-06-26
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MikeMech (Mechanical)
16 Jun 10 14:45
We use mild steel fixturing for our brazing line and are looking for a high temperature paint or coating to help prevent oxidation of the fixturing, which is exposed to flames about 1800 deg F. The parts being brazed are for food processing, so I'd like to avoid anything with cadmium or other harmful substances, even though the parts are cleaned after brazing.
So, basically, a super high temperature stove paint would help. Any suggestions? Thanks in advance.
SJones (Petroleum)
16 Jun 10 21:28
http://www.google.co.uk/search?hl=en&source=hp&q=thermal+barrier+products&meta=&aq=9&aqi=g10&aql=&oq=thermal+barr&gs_rfai= Steve Jones
Materials & Corrosion Engineer 字串7
http://www.oilandgaspeople.com/cv/11499664
http://www.linkedin.com/pub/8/83b/b04
unclesyd (Materials)
16 Jun 10 23:17
For the temperature mentioned in the OP I believe your only possibility is hot dip aluminizing your fixtures and using something like ceramic wash.
Myself I would look at some alloys that can take your temperature. Even they might have to have to use some type of wash.
I would also look at industrial ceramic kiln furniture, commonly used for brazing operations.
have you look at your brazing operation for the possibility of using a lower temperature process.
MikeMech (Mechanical)
17 Jun 10 11:12
unclesyd: yeah, I think my long term solution is to switch the fixturing over to ceramic. Unfortunately, I have a lot of legacy fixturing in mild steel and am looking for a quick and cheap "upgrade". 字串7
Thanks for the input!
unclesyd (Materials)
18 Jun 10 21:00
If as you say you have to stick with CS there are some washes or coatings that will prolong the agony of the CS. One of the problems with CS is that you continue to get grain growth and oxidation that causes the fixtures to grow and spall off.
You might want to checkout one like a kiln wash made from kaolin that is used in both large and small kilns. There are many others but the cost get prohibitive very quick.
You haven't mention the size of you fixtures but if they are small enough you can use something like Nichrome wire that would be far better than CS.
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