Metco 450NS
07-13-2011, 10:41 AM, (This post was last modified: 07-13-2011, 10:47 AM by Laurent.)
#1
Metco 450NS
Morning to all,
Please could someone confirm maxi thickness allowed to guarantee reliability for 450NS coat?
Component material is made of CRES (TBC).
Thanks for your help
Cheers
Hello again,
Component material is in fact INCO718.
Thanks
Reply
07-13-2011, 02:23 PM,
#2
RE: Metco 450NS
Hi Laurent

Typically 100 - 150 μm (0.004 - 0.006") thick applied in one pass is recommended for best bond coat. Thicker coatings will not add to bond strength, though may be considered for dimensional restoration.

Check with your customer coating specification/procedures as these may be different to above.
Reply
07-13-2011, 04:08 PM,
#3
RE: Metco 450NS
Dear Gordon,

With reference to your earlier post, did you mean thickness of 100 to 150 microns deposited in a single pass?

Assuming that you mentioned this for Plasma Spray, is this also recommended while spraying Ni-Al or Ni-Cr Buffer layers (for restoration) with HVOF?

(07-13-2011, 02:23 PM)Gordon Wrote: Hi Laurent

Typically 100 - 150 μm (0.004 - 0.006") thick applied in one pass is recommended for best bond coat.

Regards
k09
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07-13-2011, 08:06 PM,
#4
RE: Metco 450NS
Hi k09

Quote:With reference to your earlier post, did you mean thickness of 100 to 150 microns deposited in a single pass?

Yes, just for the initial bond spray pass.

Quote:Assuming that you mentioned this for Plasma Spray, is this also recommended while spraying Ni-Al or Ni-Cr Buffer layers (for restoration) with HVOF?
No, I would keep these much lower ~ <25 μm/pass
Reply
08-11-2011, 09:03 AM,
#5
RE: Metco 450NS
(07-13-2011, 02:23 PM)Gordon Wrote: Hi Laurent

Typically 100 - 150 μm (0.004 - 0.006") thick applied in one pass is recommended for best bond coat. Thicker coatings will not add to bond strength, though may be considered for dimensional restoration.

Check with your customer coating specification/procedures as these may be different to above.

Hi Gordon,
Thanks very much for your prompt reply.
In case of dimensional restoration, what maxi thickness could we think of?
It seems that coating sometimes peels off, but it could be coming from parent metal thickness (after grinding) of the compressor ring.
We manage to reduce overall repair cost by expanding machining criteria.
Most probably should we go for chemical removal.
Thanks
Reply
08-12-2011, 02:51 PM,
#6
RE: Metco 450NS
Hi Laurent

There appears to be no thickness limitation quoted for Metco 450. So this should be suitable from this aspect for dimensional restoration. Just bare in mind that the coating will only restore dimension, it will not restore the other properties of the original substrate material like strength/ductility etc.
Reply
08-12-2011, 06:18 PM,
#7
RE: Metco 450NS
Yes, I agree with Gordon. I did restoration by 450 NS before but the thickness of coating should not bigger than substrate's thickness. In aircraft engine repair industry, somtimes this may happens.
Reply
08-13-2011, 07:03 AM,
#8
RE: Metco 450NS
Hi K09,

I have applied coatings up to 3,5 mm to asteel substrate, and banged with a hammer (simple test) and it eprformed very well. Coating in fact was sprayed with plasma (argon/hydrogen). But do you wanna use for dimensional restoration or bondcoat?!
Reply
08-18-2011, 10:47 AM,
#9
RE: Metco 450NS
Hi Gordon, Derek, Joris,
Thanks very much for your help.
Coating function is to reduce air flow to get compressed air (ratio 1 to 8 approx).
This is a cold section of the engine, but polluted air as well as de-icing fluid/cleaning agent could generate coating peeling off.
Bits and pieces are then ingested and could severely damage rotating parts.
We'll check substrate thickness and compare with coating's.
I'm pretty sure coating thickness is thinner than substrate though.
Thanks again
Cheers
Reply
08-18-2011, 11:17 PM,
#10
RE: Metco 450NS
Can you use metco 480? 480 machines better then 450. What about applying a sealer for added protection. Since it is in a cold section, compressor case or diffuser, the sealer won't burn off.
Reply




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