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wanted - arc spray equipm...
Forum: Products and Services
Last Post: balaji udyog (MSE)
06-18-2021, 10:50 AM
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Arc spray wanted
Forum: Products and Services
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06-18-2021, 10:48 AM
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Hallo
Forum: Products and Services
Last Post: balaji udyog (MSE)
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MIL-STD-869D TYPE III
Forum: Surface Engineering Threads
Last Post: joe plasma
06-14-2021, 05:03 PM
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Looking suggestion for S...
Forum: Surface Engineering Threads
Last Post: demionkrishan
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Introduction
Forum: Other Topics
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Buy a plasma system
Forum: Surface Engineering Threads
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06-07-2021, 04:34 AM
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7MC gas module wanted
Forum: Products and Services
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used 11MB gun for sale (2...
Forum: Products and Services
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05-30-2021, 11:58 PM
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metco 101bns powder / ten...
Forum: Surface Engineering Threads
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05-24-2021, 12:54 PM
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High Carbon Steel - Ammon...
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05-23-2021, 12:45 PM
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16C-NS cracking issue
Forum: Surface Engineering Threads
Last Post: Stephen Booth
05-12-2021, 06:14 AM
» Replies: 20
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Crank-tap HVOF - spray.
Forum: Surface Engineering Threads
Last Post: JeroenB
05-07-2021, 01:36 PM
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Green flame in HVOF hydro...
Forum: Surface Engineering Threads
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05-07-2021, 01:24 PM
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CTE Measurement - How To
Forum: Surface Engineering Threads
Last Post: Vadim Verlotski
05-05-2021, 04:33 PM
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HVOF Coating Calender Rol...
Forum: Surface Engineering Threads
Last Post: JeroenB
04-29-2021, 03:34 PM
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Powder Identification
Forum: Surface Engineering Threads
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An engineering forum webs...
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04-22-2021, 04:20 PM
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Combination of aluminum a...
Forum: Surface Engineering Threads
Last Post: Vadim Verlotski
04-20-2021, 05:36 PM
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HVOF Spray Machine, Plasm...
Forum: Products and Services
Last Post: Vivian Ruan
04-20-2021, 10:32 AM
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» Views: 2,135

 
  Looking suggestion for S2B "Z" notch coating & dove tail ARC spray aluminium coating
Posted by: demionkrishan - 06-14-2021, 02:09 PM - Forum: Surface Engineering Threads - No Replies

Dear thermal spray family, 
Is anyone here, doing Gas turbine stage 2 bucket plasma "Z" notch and dovetail Arc spray aluminium coating?
 I am totally new to this subject and I feel personally, it is time consuming process to mask the whole area with plasma tape to coat a very small area. The time for masking per piece is on an average 15 minutes, is there any way to reduce time or any other methods? Appreciate your valuable feedback 🙏

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  MIL-STD-869D TYPE III
Posted by: joe plasma - 06-11-2021, 08:03 PM - Forum: Surface Engineering Threads - Replies (3)

Hello All,

Does anyone know what type of system is used for:

MIL-STD-869D 
Type III
Powder: Plasma process for spraying materials in a powder form utilizing a non-transferable electric arc with nitrogen. Argon and Helium as a secondary gas with or without hydrogen.


Can I use a 9MC console with 9MB gun and 9MP powder feeder?

The type of powder to be sprayed will be 73F-NS-1.

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  Buy a plasma system
Posted by: kaizmoto1489 - 06-07-2021, 04:34 AM - Forum: Surface Engineering Threads - No Replies

Hello everyone,

I am going to buy one plasma system but not decide the model and brand yet.
I have considered 3 options:

1. 100HE from Progressive
2. Sinplex from Metco
3. KK gun from AMT

Base on my experience, 9MB is more stable than 100HE,but at that time the 100HE system is assembled with TAFA system and 100HE torch.
I am not sure if the original setup can help the plasma system more stable?

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  used 11MB gun for sale (24")
Posted by: KevGarty - 05-25-2021, 03:50 AM - Forum: Products and Services - Replies (2)

We have an 11MB (24") that is surplus to our needs. Gun was purchased for around $20k (AUD) for a project that sprayed a total of 6 jobs and hasn't been used since (2015)

Open to offers 

Located in Brisbane Australia. Contact for Photo's 

Cheers

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  High Carbon Steel - Ammonia corrosion
Posted by: thorgrim - 05-23-2021, 01:10 AM - Forum: Surface Engineering Threads - Replies (1)

Greetings everyone, recently we have been repairing the Journal bearings of a twin screw Ammonia compressor .  The repair was done spraying the journals with an arc spray NiCr bond coat layer and as a rebuilding material we used a Sprasteel 80 Metco Wire (0.8% Carbon Steel,commercially known as High Carbon Steel) with a  high velocity wire flame spray gun.  The ground finished dimensions were perfectly in OEM tolerances and all the compressor working parameters were OK as oil Viscosity,working discharge pressure and temperatures,Screws RPM and everything else, but after some 8 hours of operation the bearings temperature begun to rise and the compressor was stopped and dismounted.  The Journals and the Babbitt bearings were completely worn out. As we have repaired a lot of Journal bearings in turbines,electrical motors,crankshafts and a lot of other rotary mechanical equipments, all working in lubricated hydrodynamics Journals and we never have found any kind of problems with the job, we guess if in this twin screw compressor, working with Ammonia gas the High Carbon Steel sprayed coating could have suffered a chemical attach corrosion trouble and the repaired journals are being damaged for this reason.  Could some one please help with this issue_?  Thanks

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  Crank-tap HVOF - spray.
Posted by: GeorgeStevens - 05-07-2021, 06:49 AM - Forum: Surface Engineering Threads - Replies (1)

Does anyone here already have experience or knows more about the well-known High Velocity Oxygen process for spraying parts.
I am a Flandria freak (may not belong here, but yes) and I sometimes have problems with run-in crank taps at the level of the bearing on the flywheel side.
I have had many original new old stock parts but the crankshaft department for certain types of engine blocks is running out.
Can this be a good solid alternative to save the original crankshaft to original sizes / bearing.
Near me there is a company called LMS in Elsloo.
Another option is to turn / grind the crank tap 1mm to an undersized bearing (there is and also the seal), but then the hardness is gone and the crank tap weaker of course.
I think the crank tap is only surface hardened.
Or is there another option, please get a response from the crankshaft specialists here on the forem.

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  Green flame in HVOF hydrogen - oxygen combustion
Posted by: JeroenB - 04-29-2021, 03:19 PM - Forum: Surface Engineering Threads - Replies (3)

Dear, 

We have a HVOF installation fueled by hydrogen and oxygen. Normally our flame is almost invisible but sometimes it turns green. We have narrowed down the origin from the hydrogen gas, when changing a hydrogen pack the flame can suddenly turn green. In the past we always rejected these shipments of hydrogen but it has become more frequent since we switched from hydrogen supplier. Our accuraspray camera measures no change in particle speed or temperature with a green or invisible flame. 

My current suspects are:
1. Impurities in the hydrogen weaken the copper somehow and it is burned, turning the flame green
2. Impurities in the hydrogen gas itself turn green when burned

Do others have similar issues? Do you have other ideas what it might be? I'm not sure if I should be worried about the green color.

Best regards,
Jeroen

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  Combination of aluminum and stainless steel
Posted by: davehetfield - 04-20-2021, 12:13 PM - Forum: Surface Engineering Threads - Replies (2)

Hi everyone, after reading quite a bit about the thermal expansion of different materials, I still have some questions. Aluminum and stainless steel have a very different CTE, aluminum almost twice as much. How are they fused together and maintain their bond through heating and cooling cycles?

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  Reg: POT Stabilizer Rolls
Posted by: Dileep - 04-16-2021, 07:33 AM - Forum: Surface Engineering Threads - No Replies

Dear Friends,

We have a received an order for POT Stabilizer Rolls from one of our customer. The drawing calls for a surface roughness of 1.6-1.8 Ra.

As this roll will be used in a Zin Pot we are supposed to apply a sealant for proper sealing of the porosity. As of now am using DICHTOL HTR0977 Sealant.

The Surface Roughness after coating ( HVOF Process ) is in the range of 4-6 Ra. But once we apply the sealant and cure it the Roughness is coming down to 0.4-0.5 Ra.

Can anyone help me out how to maintain the roughness in the range of 1.6-1.8 Ra.

Also please do let me know whether the sealant what we are using currently is the proper sealant for this application.

Do help me out in this scenario.

Thanks in advance.

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  Metco 11MB Gun Parts
Posted by: cincykids - 04-07-2021, 06:20 PM - Forum: Products and Services - No Replies

We have an assortment of Original Metco 11MB Gun Parts for Sale 

Drop us a message if you have an interest. These all can be shipped from the US internationally via USPS Mail at reasonable rates.

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