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Shy HVOF Coating Calender Roll issues. Suggestion needed
Posted by: tobjung - 02-10-2021, 12:54 PM - Forum: Surface Engineering Threads - Replies (2)

Greeting from Venture Engineering Thailand.

I would like to ask for some helps on Calender roll-WC17Co HVOF Coating. I have to admit that this was my first time spraying this kind of roll. 

The issue is after the roll was operated for 3 days, as you can see from the picture, there are some marks on the surface distributed all over the roll (like the coating bounce off). 
Moreover, there are cracks appear on the coating surface. (We did PT and it was fine before delivery). 
Now we have to re-coat it but we still have no idea what are these problems are coming from (especially, marks on the surface).

Pictures and Videos

Here are the coating details



  1. HVOF coating (JP-5000)
  2. WC17Co powder (particle size 15-45um and 15-53um)
  3. We did HVOF coating for 400um in thickness
  4. We sprayed 15-45um powder for 200 microns and the rest were 15-53um powders (we ran out of 15-45um powders so we had to use substituted powder)
  5. The operator changed feed rate back and forth throughout the operation
  6. Using slide way instead of handheld (but the gun was vibrated quite hard as you can see from the video)
  7. Temperature control on roll surface was 100 C
  8. Time interval of each ignition was 1-2 hours (as the cooling water was really hot, we had to wait)
  9. Grind to 200 microns with roughness of 0.1 Ra


Here are the working environment (see picture)
  1. This is the Queen Calender roll
  2. In the middle of King and Middle roll
  3. It is working with doctor blade
  4. The roll is in contact with chemical compound
Any suggestion would be helpful

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  Metco Type 5P ThermoSpray Gun For Sale
Posted by: Mgregory87 - 02-09-2021, 11:05 PM - Forum: Products and Services - No Replies

I have a Metco Type 5P ThermoSpray gun for sale. Open to sensible offers and can offer secure postage at the buyers expense.

The gun appears complete and has the secure case with manual etc. Not been used for some time and I am selling on behalf of an elderly family member.

Happy to share images of what I have and answer any questions.

Feel free to email me direct on 'michaelgregory1987@hotmail.co.uk' or text / call me on +44 (0)7593 802264

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  Electron-beam physical vapor deposition masking
Posted by: jtonic77 - 02-05-2021, 08:32 PM - Forum: Surface Engineering Threads - Replies (4)

Hello All, 

Any suggestions on what is the best solution for high temperature (800C to 1000C) Electron-beam physical vapor deposition (EB-PVD) masking for gas turbine aircraft engine? Preferably some sort of tape, so it is easy to use.

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  Stellite 31
Posted by: Daneizer - 02-05-2021, 04:15 PM - Forum: Surface Engineering Threads - No Replies

Greetings All,
We have an application that requires Stellite 31 via HVOF. Looking for feedback on best powder for this application.

Thanks 
Dan

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Lightbulb Low hardness on AlTiN Coating
Posted by: Christian93 - 02-05-2021, 02:32 PM - Forum: Surface Engineering Threads - No Replies

Hello everyone,

we have an issue with one of our PVD coatings: AlTiN.
In literature and on PVD suppliers websites you can see that AlTiN coatings can reach hardness around 3000-3500 HV (~30-35 GPa), but our coating has a hardness around 1500-1800 HV, does anyone have any idea why?

Some info:
-Target: AlTi 67/33 at%
-Deposition method: cathodic arc

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  Metco 16E 14E for sale
Posted by: plasmajet1990 - 01-29-2021, 01:58 PM - Forum: Products and Services - No Replies

Hello,

I have for sale 14E and 16E guns, complete, in very good condition. 
You can check it all here:

https://plasmajet.ro/en/produs/metco-16e...condition/

https://plasmajet.ro/en/produs/flame-spr...metco-14e/

https://plasmajet.ro/en/shop/


Thanks!

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  Amdry 9951. Anyone know the maximum coating thickness
Posted by: Antcarroll - 01-28-2021, 10:12 PM - Forum: Surface Engineering Threads - Replies (2)

Amdry 9951.
Anyone know the maximum coating recomended thickness

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  Colmonoy Coating Machining
Posted by: Danmarco - 01-23-2021, 02:05 AM - Forum: Surface Engineering Threads - No Replies

Hello everyone

Would like to know which type and grade of insert is recommended and a supplier if possible
Coating nos 60 Hrc
We usually grind colmonoy, but sometimes it is needed to machine chamfers or other geometries

Thanks!!

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  seeking help regarding power soorce problem
Posted by: Kiran121 - 01-21-2021, 03:34 PM - Forum: Surface Engineering Threads - No Replies

Sign0009
I am facing very long problem related to power drop . After ignition ( min 150amp) and recepie load (500amps)  sudden jump in current more than set amps (upto550) and parameter established slowly but current will drop more than 50amp from set amps ... some time it will nt ignite flame some error   two times gun partd damaged 

[Image: aKp2YZ8FrwPcPc2cA] https://photos.app.goo.gl/aKp2YZ8FrwPcPc2cA 
shutdown B31:17/04 Plasma stopped (Current=0)
shutdown B31:18/09 Power supply IPS-1000 voltage »50V after switch on
warning B31:47/04 JAMBox: Ignition device not ready

see photos for more clearity 
please provide any information related this 
thanks in advance ! 
 

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  How to interpret the result of
Posted by: Hoon Lee - 01-19-2021, 03:21 AM - Forum: Surface Engineering Threads - Replies (2)

Hello I'm Hoon and I have a question.
please give me your opinion.

I tested some specimens following ASTM C633 method.

And one of the specimens looks like the picture I attached.
[Image: ngHRwlm] https://imgur.com/ngHRwlm
The value of tensile strength is 25.660MPa

and How do I interpret this result?

1. Some of surface still attached around 20%? So, I can assume the total strength is around 31MPa
2. Nope. No matter the rest attached or not, The tensile strength is 25.660MPa

It can be poor question, but I need your help.
I'm looking forward to your reply

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