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Required Material for Spr...
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Yellow Spot on Thermal Ba...
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F4 nozzles 6 mm and 8 mm....
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Porosity problem - HVOF
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08-28-2020, 06:52 AM
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  Required Material for Spray
Posted by: demionkrishan - 10-18-2020, 11:34 AM - Forum: Surface Engineering Threads - Replies (1)

Dear Thermal spray enthusiast,  
I am currently working on to develop an app for calculating the Thermal spray material and cost.
I need all your input to made this success. I have used below formation / formulas, which may be correct. 
Please do  your own calculation and share your answer for testing purpose.

Sample: Cylindrical object : 300mm diameter 5000mm Length


1. Calculating the Surface Area = pi x d x h
2. Calculate Volume : Surface area x thickness ( assume 0.5 mm / 500 microns per side)
3. Calculate weight of the material deposited = Volume X density ( Assumed 90% of density for WC10Co4Cr (13.63g/cm3)
4.  Assumed Deposit efficiency 40%

Please do share your thoughts as well with your answers. 

Regards,
Demion

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  F4 nozzles 6 mm and 8 mm. Application differences
Posted by: uncle_tyoma - 10-16-2020, 09:37 AM - Forum: Surface Engineering Threads - Replies (1)

Hi everyone.

We usually use a 6 mm nozzle for F4. A nozzle with a diameter of 8 mm was obtained for the sample.

There was a question about using a nozzle with a diameter of 8 mm. For what applications is the 8mm nozzle in general? Maybe for some special materials? And in general, what are the features when using this nozzle? What is the application difference between 6 and 8 mm nozzles?

Grateful for any information.

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  Yellow Spot on Thermal Barrier Coating
Posted by: achmadarifudinh - 10-15-2020, 09:13 AM - Forum: Surface Engineering Threads - Replies (6)

Hi friends

i have a issue to my thermal barrier coating for nozzle segment in GE gas turbine. after one day spray there are yellow spot on my coating. I am spraying with 7MC unit control and 3MB gun from Metco Sulzer, bond coat: AMDRY 962 and top coat: METCO 204 NSG

Could you help me, what is the reason of these yellow spots (dots) on coating?
From our experience inspector it is caused by uncleaned penetrant removal process, how about you guys??

I enclosed the images for your consideration. Your recommendation will help me a lot.
Thank you

Best
Achmad Arifudin H



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  Looking for used Rokide
Posted by: tobjung - 10-06-2020, 03:10 AM - Forum: Products and Services - No Replies

Hi guys. I am looking for used Rokide system. 
If you have ones and are willing to sell, please PM me.

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  Castolin Micro Gap 50DC Microplasma Welder For Sale
Posted by: kwlee - 09-16-2020, 05:20 AM - Forum: Products and Services - No Replies

Castolin Micro Gap 50DC Microplasma Welder For Sale

Condition is very good like new. Using PTA Technology and Weld like Laser.

Item is in Singapore

PM if interested



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Pencil Forum Upgrade
Posted by: Gordon - 09-15-2020, 05:12 PM - Forum: Forum and Website - Replies (1)

Sorry for SEF being down on Sunday 13 September 2020 as I needed to complete a long overdue forum upgrade.

All appears to be working pretty much as before, hopefully more secure. You may have noticed the change of URL address from HTTP to HTTPS.

Hopefully not too many bugs are going to crawl out of the woodwork. Please do inform me of any problems.  Mad0223



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  SC 3464 powder equivalent is ????
Posted by: achmadarifudinh - 09-10-2020, 07:55 AM - Forum: Surface Engineering Threads - Replies (1)

Dear all

does anyone know what the equivalent powder SC 3464 from SIEMENS proprietary ??
This powder commonly used to thermal barrier coating gas turbine part.

I hope you can help me.

Best
Achmad Arifudin H

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  Isotropic reflector ideas please
Posted by: Supersmithy - 09-09-2020, 03:33 PM - Forum: Surface Engineering Threads - No Replies

Hi there,

If this community doesn't have the answer I'm at a loss Big Grin

I'm wanting to create an isotropic reflector of infrared light. That is, a metal panel that I can point a thermal imaging camera at and what the camera will see is the reflective temperature of the entire room - be that the camera operator, a radiator on an adjacent wall etc etc.

The 'target' wants to be in the order of 200x200mm in size and importantly we want to produce lots that all behave in the same way i.e. a repeatable process.

Current line of thought is:

3mm polished aluminium sheet to start
CNC blasting using a fairly large grit, glass bead or peaner

The challenge is identifying an approach that can be applied consistently whilst creating fairly deep large indents (curved or flat faces) that are smooth/don't imprint a roughness, retaining the overall reflectiveness....whilst also not deforming the flat plate. A concern about aluminium would also be that it might dull and be less effective with time but SS is perhaps too hard to dent and form? A final finishing process could also be considered.

Any thoughts on process options, suggested grits and beads to try as well as other ideas welcome. And if I could be pointed in the direction of a company that might be able to help with samples, that would be even better!

Many Thanks

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Lightning SF Lanse Castolin buy
Posted by: Yod - 09-03-2020, 06:53 PM - Forum: Products and Services - No Replies

Buy SF Lanse Castolin
write private messages. thank

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  Porosity problem - HVOF
Posted by: thaisrms - 08-27-2020, 04:26 AM - Forum: Surface Engineering Threads - Replies (6)

Dear,

my company had a porosity problem in the carbide coatings (tungsten, chromium, tungsten + chromium, etc.) by an air-cooled HVOF system. This problem started recently and we were unable to resolve it. We believed it was a problem with the equipment calibration, but due to the corona virus, it was not possible to bring a technician to our company.

We then decided to purchase a new MEC MDJ2700 water-cooled equipment - propylene.

We used the following parameters to apply the woka3302 powder (WC 10Ni):
O2: 250 lpm, 10 bar
C3H6: 80 lpm, 8 bar
Air: 390 lpm, 9 bar
N2: 20 lpm, 9 bar
Feed rate: 35 g / min (4 rpm)
Distance: 240 mm

When we performed the penetrating liquid test, the result was the same as in the past: no crack, but less than 30 seconds later the piece was COMPLETELY red.

Our compressed air is completely dry and free of impurities (network of activated carbon filters recently added) and the fuel gas cannot be agreed since the equipment has a vaporizer that is kept at 55 degrees celsius.

Do any of you have any idea what's going on?

Sorry for my english, hope you can understand.

Thank you very much for your attention.

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