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  Carbide in Chromium-Nickel matrix mechanical properties
Posted by: KRYM2006 - 06-06-2007, 10:24 PM - Forum: Surface Engineering Threads - Replies (8)

Hello Everybody,

I am interested in mechanical properties of a coating made of carbide (SiC or WC) in Ni-Cr matrix.

For instance, we have a cast iron sample coated with a carbide/Ni-Cr coating. Now, this sample undergoes a mechanical shock, e.g. hammering or dropping down onto a concrete floor from height of two feet. Is this kind of coating enough malleable to withstand this shock without cracking or crumbling?

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  Coating thickness
Posted by: Arturas - 06-05-2007, 11:56 AM - Forum: Surface Engineering Threads - Replies (3)

Hello
I have problem related with coating thickness. After spraying of NiCrBSi coating on stick form part - diameter 300mm I am measuring thickness and it shows me 1mm . Then I perform fusing and when temperature of part is approximately 100C coating thickness decrease to 0.8mm. It looks normal but after part cool down to room temperature I can find only 0.4-0.3 mm of coating. The thickness of coating I am measuring with portable thickness measuring device.. May someone explain this situation?

Arturas

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  NiCrBSi
Posted by: lenicacraint - 05-31-2007, 10:51 AM - Forum: Surface Engineering Threads - Replies (8)

Hello,

I've choosen HVOF NiCrBSi coatings against erosion/corrosion on turbine rotor.

Did anyone have any experience on this topic ?

Thank you for your answer !

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  Stress in the substrate
Posted by: Vijay Deshpande - 05-30-2007, 05:51 PM - Forum: Surface Engineering Threads - Replies (1)

Hallo,
Does sresidual stress in the substrate can cause interlayer disbonding in Arc sprayed coating?
Vijay Deshpande

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  Re-applying Metco 308
Posted by: gejohn - 05-30-2007, 02:53 PM - Forum: Surface Engineering Threads - Replies (8)

Hello again,

I am experimenting with this abradable coating and trying to prevent any more strip and recoats. Whenever this coating falls out in the metlab or in the machine shop, we have to strip the whole diameter.

In your experience, have you ever sprayed on top of machined Metco 308? I know there are powders that allow you to do this, but have not seen this yet for 85:15.

Any ideas?

John

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  Rockwell Hardness-15Y
Posted by: gejohn - 05-29-2007, 06:48 PM - Forum: Surface Engineering Threads - Replies (2)

Good afternoon,

We are spraying 85:15 Nickel-Graphite with a bond coat of Aluminum-Nickel-Chromium. The requirements of this shot is 50-70 (15Y). I am consistently achieving a superficial hardness in the high 70 range on a coupone with atleast 0.080" of top coat on it.

We are applying this shot via "flame-spray", and our process involves Nitrogen, Oxygen, and Acetylene. The factors that I can easily control are flow, spray distance, and psi.

Does anyone know of a simple way to reduce my Rockwell hardness? I am running test coupons now, but thought I would share my experience on the forum. Please let me know, thank you.

John

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  Boriding or boronizing
Posted by: gasper - 05-29-2007, 06:27 AM - Forum: Surface Engineering Threads - Replies (13)

Hi,

can anyone tell me something about boriding. I know what is boriding, but if is possible to get more information about this surface treatment.

When to use it and where to use it.

Regards,

Gasper

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  Waterproof top coat for surfboard??
Posted by: John C. - 05-27-2007, 07:17 AM - Forum: Surface Engineering Threads - Replies (1)

We want clear, waterPROOF as possible, and with UV absorbers. The board is made with fiber reinforced epoxy resin. The epoxy surfboard resins soak moisture. Paint companies don't give water absorption data. Our best choices so far are a DuPont higher quality 2 part polyurethane automotive clear coat named Chroma, or marine LPU water based or solvent based. I've also come across a high quality teflon filled 2 part polyurethane DuPont Imron, and a ceramic filled very thin paint called Cerakote I'm having a touph time finding something waterPROOF as possible, any help? please John C. San Diego California USA

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  Thermal Sprayed WC against TiC
Posted by: ruskasinthehouse - 05-22-2007, 04:44 PM - Forum: Surface Engineering Threads - Replies (1)

Hello

Does anyone has any experience of having TiC running against thermal sprayed WC-NiCr (sulzer) or Stainless steel running against TiC?

Let me know any coments/suggestions!!!!

Regards

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  Question on abradable coatings : manufacturing and tests
Posted by: karusade - 05-18-2007, 04:47 PM - Forum: Surface Engineering Threads - Replies (8)

Hi!

I have questions about the use of polymer in thermal sprayed abradable materials (TSAM) .

1) I would like to know if abradable coatings are always made of polymer.

Some TSAM are mentionned to have polymer after the thermal spray process like the AlSi/polyester and other don't : AlSi/graphite, Ni/grahite, MCrAlY and ceramics... are not mentionned with polymer phase. But I read that the polymer was a mean to controle the porosity rate in MCrAlYs because when you burn, it evaporated and become a porosity.

So, do the the AlSi/graphite, Ni/graphite, Metal matrix+release agent family, ceramic family, use this mean to control their porosity rate or is it only by tuning the therml spraying parameters ?

And do they (+MCrAlYs) still contain polymer after all the manufacturing process ?

2) I have read the list of abradable coatings on your website :
* Aluminium silicon alloy/polymer composites
* Aluminium silicon alloy/graphite composites
* Nickel/graphite composites
* Aluminium bronze/polymer composites
* Nickel chromium aluminium/boron nitride composites
* Nickel chromium aluminium/bentonite composites
* Nickel/aluminium composite sprayed porous
* Nickel chromium aluminium composite sprayed porous
* MCrAlY/BN/Polyester composites
* YSZ ceramic/Polyester composites

but I don't understand
* Nickel/aluminium composite sprayed porous
* Nickel chromium aluminium composite sprayed porous
Can you explain me a bit what do "metal composite sprayed porous" mean.


Thanks in advance.

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