Gas Turbine Blades HVOF Coating masking

[demionkrishan]

Hi! to all genius,
need all your valuable experience to sort out my issue.
I am having over spray coating below airfoil area of Stage 1 Blades during HVOF process and I have spend about 10hrs time to clean all the blades (Set). Do anyone coating Stage 1 blades over here and how you avoid over spray? is there any special mask or any liquid to stop permanently?

waiting your valuable comments

Thank and regards
Krishz

[Christian_B]

Hi Krishz,

very good experience with Greenbelting HVOF Masking Tape - reference "HVMT Orange"

Supplier's description: "This is a soft and conformable Masking Tape designed for use with gas-fuelled HVOF. The tape is a single application masking for both preliminary Gritblast and subsequent HVOF Spray. Availability is in all widths and with a standard roll length of 16.5 metre"

Works as well as it is advertised.

Cheers, Christian

[demionkrishan]

Hi Krishz,

very good experience with Greenbelting HVOF Masking Tape - reference "HVMT Orange"

Supplier's description: "This is a soft and conformable Masking Tape designed for use with gas-fuelled HVOF. The tape is a single application masking for both preliminary Gritblast and subsequent HVOF Spray. Availability is in all widths and with a standard roll length of 16.5 metre"

Works as well as it is advertised.


Christian,
thanks for taking time. I am using Diamond Jet 2600 HVOF gun.
and I have tried below my hard mask. not support much as I expect.
looking something better... if someone doing blades coating please
do share with us.

thanks Christian
and team
cheers, Krishz

Cheers, Christian

[loriolo]

Hi Krishz

The best masking product for HVOF I used where two, the first is Speedmask 718 which is a masking resin that has an excellent protection against both APS and HVOF coatings, this is the best I used, but cleaning up some time could be difficult, because clean-up of cured material may require mechanical removal, when admitted organic solvents can’t remove, the second is FST 901.001 a two components silicone polymer compound, ideal for masking holes (your successive thread), both threaded or not, resistant to burning, and ideal for HVOF, APS and blasting masking, the advantage of this masking compound is that in some case it could be reusable, and is very easy to remove

[hlmtbs]

[quote='demionkrishan' pid='10658' dateline='1487802322']

Hi! to all genius,
need all your valuable experience to sort out my issue.
I am having over spray coating below airfoil area of Stage 1 Blades during HVOF process and I have spend about 10hrs time to clean all the blades (Set). Do anyone coating Stage 1 blades over here and how you avoid over spray? is there any special mask or any liquid to stop permanently?

waiting your valuable comments

Thank and regards
Krishz


Hi Krishz,
we can offer kneadable 2-part silicone compounds for Masking.(like FST Product)

We also offer a Silicone based 2-part compound to mask cooling Holes in Turbine Vanes and Blades.(New)
We are able to let you have Samples for your own Trials.
Regards
H.B

[Artyom]

Hello Krishz!

You can try the Machbloc HVOF masking compound for cooling holes protection. I haven't worked with this compound personally, but my colleague told me that it is very good withstand against HVOF jet (at the least against the gas-fueled 2600 DJM, I don't know how it withstands against liquid fuel guns).
After coating this compound can be removed by heating in an atmospheric furnace/oven to 538C (1000F).

https://www.tape-works.com/pages/about-m...g-compound
https://www.tape-works.com/pages/machblo...pound-demo

Regarding the tapes: HVMT Orange (as Christian said) and Dewal DW500 are very good. But you know, any tape always should be ironed with a metal/plastic spatula to remove air bubbles from under the tape - it takes better bonding and thermoresistance.

Kind regards,
Artyom

[ksyfullah07]

You can try Speedmask 718... Iused it and it gives good result

[Taz]

Hi! to all genius,
need all your valuable experience to sort out my issue.
I am having over spray coating below airfoil area of Stage 1 Blades during HVOF process and I have spend about 10hrs time to clean all the blades (Set). Do anyone coating Stage 1 blades over here and how you avoid over spray? is there any special mask or any liquid to stop permanently?

waiting your valuable comments

Thank and regards
Krishz

Hi Krishnan,

Have you try to use a silicon rubber mask to cover the blades?
Make the height of the silicon rubber mask to your designated control coating height.
Hope this will help you.