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tn619
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Join Date: May 2012
Posts: 5

Oxidation Of Heat Treated Parts In Furnace

05/09/2012 3:21 PM

We have an old belt furnace that sinters metal parts. We've gotten oxidation and coloring of the parts. The oxygen level during sintering is around 5-10ppm. Is there a way to lower the oxygen levels to around 1-2ppm?
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Pathfinder Tags: Belt conveyor firing furnace metal oxidation Parts sintering
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RVZ717
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United States - Member - USA! Hobbies - Musician - Sound Man Engineering Fields - Mechanical Engineering - More than a Hobby Technical Fields - Technical Writing - New Member

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#1

Re: Oxidation of Heat Treated Parts in Furnace

05/09/2012 4:17 PM

Displace the air with an inert gas.

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lyn
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#2

Re: Oxidation of Heat Treated Parts in Furnace

05/09/2012 4:18 PM

Flood it with nitrogen.

You're 78% of the way there already.
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RVZ717
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#4
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Re: Oxidation of Heat Treated Parts in Furnace

05/11/2012 12:34 PM

Why off topic?

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nzhou
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#3

Re: Oxidation Of Heat Treated Parts In Furnace

05/09/2012 7:10 PM

You could be having problems with the gasses that are being released from the parts contaminating the belt and the muffle. This means you might need a more advanced belt cleaner like an ultrasonic cleaner.

You can also use a N2/H2 combined gas instead of pure nitrogen or pure hydrogen.

If you don't have a flame curtain already attached, then one should be installed to ensure proper coverage of the open end



Reference websites:

http://heattreatment.linde.com/International/Web/LG/HT/like35lght.nsf/repositorybyalias/wp_sntrg_8/$file/8.pdf



http://Beltfurnaces.com



http://www.airproducts.com/industries/Metals/ask-the-experts-metals/sintering-powder-metals-and-powder-metal/sintered-parts-frosty-matte-finish.aspx



http://www.abbottfurnace.com/
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