Silicon Mask or Metal Mask for HVOF

[Taz]

Hi all,

Masking for thermal spray is essential as one of the reason is to avoid overspray on non-coated area.
But which masking are suitable for HVOF process?
Currently Im using silicon mask and within a few month only (depends on frequency of using), it already wear off and causing overspray on my parts.
Metal mask is a good option but it will cause HVOF coating to build up on it after prolong exposure. Even though anti bond was apply, but it also peel off during the process.

What you guys think? Any other resources or methods that are better?

Thank you

[loriolo]

HI TAZ
Moldable BlueShield is a very good mashing moldable compound, I’ve been using it to masking all difficulty geometry parts to be coated by HVOF system, and inside holes too, but on revolution surfaces I apply the normal Tape for high temperature like DW 501 or 503, that are easier to remove from the piece after coating, all of this tapes are from DEWAL , but there are many others tape productors that have similar products. Of course you must choice the product that match with you application, for example if you use to do coating on series of particulars, so you must use solid masking in order to mount and takeoff the masking more easily, like metal or silicone protections.

[Lemster68]

Good morning,

We have not used these people before, although I have suggested giving them a try. So, unfortunately, I cannot tell if they have good prices. I have a very good impression of their products from their web site, so here is a link:

http://maxolstudios.com/thermal-spray-masking/

I have no affiliation with them, and stand nothing to gain from posting this link. If you or anyone else decides to use their products I would love to know well their products perform. The company for which I work could use a good push in the right direction for masking HVOF as well as other processes.

[Taz]

(04-25-2019 12:15 PM)loriolo Wrote:  HI TAZ
Moldable BlueShield is a very good mashing moldable compound, I’ve been using it to masking all difficulty geometry parts to be coated by HVOF system, and inside holes too, but on revolution surfaces I apply the normal Tape for high temperature like DW 501 or 503, that are easier to remove from the piece after coating, all of this tapes are from DEWAL , but there are many others tape productors that have similar products. Of course you must choice the product that match with you application, for example if you use to do coating on series of particulars, so you must use solid masking in order to mount and takeoff the masking more easily, like metal or silicone protections.

Hi,

I've heard about Dewal before but have not yet try their products.
The Moldabel Blueshield compound that you mention here, it is flexible compound?
What is the lifespan based on your usage for HVOF process?

[loriolo]

its moldable and plastic tape in order to apply it on complicated geometry, or holes, on holes you can apply grafite or copper caps too