Spraying on nitriding surface
06-14-2007, 02:07 PM,
#1
Spraying on nitriding surface
Hi forum,

I need help. Ashamed0002We have troubles with HVOF spraying on nitriding surfaces. We use stainless steel FeCrNiBSiC. If coating contact with nitriding surface, his crashed. What I can to do?
May be anybody recommend other material with microhardness around 800HV for repair and build-up.

Thank you.
Reply
06-14-2007, 02:31 PM,
#2
RE: Spraying on nitriding surface
Hi Panf

Coating nitrided surfaces can be difficult. It is difficult to get a decent grit blast profile and many coatings appear not to bond too well compared to untreated steel, particularly if white layers are present.

I would recommend removing the nitrided layer if that is possible.
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06-18-2007, 04:41 PM,
#3
RE: Spraying on nitriding surface
Hi,
Nitrided layer removal, as suggested by Gordon is necessary to build up spray deposit.To soften the nitriding layer you can do a heat treatment at 500-540C,nitriding temperature.Alternatively you can use diamond/or BN tools to remove the thin nitride layer.
ram chattopadhyay
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06-21-2007, 08:59 AM,
#4
RE: Spraying on nitriding surface
Yes, I see
But what to do, if I coating the surface right against the nitrided surface
I need to place masking shield over nitrided surface, and during spraying the coating deposit on her and crashed Sad
Reply
06-25-2007, 02:07 PM,
#5
RE: Spraying on nitriding surface
Hi Panf

Sorry, I am having trouble understanding what you are trying to achieve. Could you try to give us more information (a sketch or drawing may be helpful).
Reply
06-26-2007, 02:56 PM,
#6
RE: Spraying on nitriding surface
yes, my English is very bad Ashamed0002

sorry

I hope Gordon will attach the sketch to my post
Reply
06-26-2007, 03:56 PM,
#7
RE: Spraying on nitriding surface
Hi Panf

You can email me here or here with your image ideally in jpg or gif format. Or you could use one of many free file hosting sites, see http://www.gordonengland.co.uk/sef/image...t-139.html
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