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CTE Measurement - How To
Forum: Surface Engineering Threads
Last Post: Vadim Verlotski
05-05-2021, 04:33 PM
» Replies: 5
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Green flame in HVOF hydro...
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05-02-2021, 10:50 AM
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HVOF Coating Calender Rol...
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Combination of aluminum a...
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Hallo
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Reg: POT Stabilizer Rolls
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Metco 11MB Gun Parts
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Hardness increase in Chro...
Forum: Surface Engineering Threads
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03-25-2021, 01:24 PM
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HVOF price
Forum: Products and Services
Last Post: wilson
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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 (2)

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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  Hardness increase in Chrome Ceramic Plasma Coating
Posted by: DMan - 03-17-2021, 05:58 PM - Forum: Surface Engineering Threads - Replies (6)

Hello All

We coat Cr203 ceramic by plasma coating with oerlikon sinplex pro . 
Since past few weeks, the coating hardness has suddenly increased .
Although I have not made any changes to process parameters in coating, I am still wondering what may have suddenly caused this.
Can anyone guide me on particular factors which can cause sudden increase in hardness of ceramic.
Note : Power on gun, Feed Rate , gun distance are all same as before. No change in thickness/pass, powder flow rate same as before.
Warm regards
DMan

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Question CTE Measurement - How To
Posted by: EmilAV - 03-15-2021, 04:37 PM - Forum: Surface Engineering Threads - Replies (5)

Hi,

We are currently trying to evaluate CTE for different ceramic top coats with various spraying parameter.

How is it normal to measure CTE for coatings?

Best Regards,
EmilAV

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  Metco MRN Plasma Spray System
Posted by: cincykids - 03-04-2021, 12:10 AM - Forum: Products and Services - Replies (4)

Complete Metco MRN Plasma Spray System

Includes:
Sulzer Metco 3MB-H Spray Gun

MCN Controller

MRN-240 Power Supply 40Kw

Sulzer Metco 4MP-D Dual Powder Feeder W/ High Capacity Feeders 

4ME Heat Exchanger

Connection Cables and Hose Set (complete)

FOB Chicago (USA) Export
Available for immediate shipping



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Star HVOF WCCo on Chilled Cast Iron(55HRC)
Posted by: tobjung - 03-03-2021, 04:26 PM - Forum: Surface Engineering Threads - Replies (1)

Dear forum,

Recently we coated a calender roll which is made of chilled cast iron (Hardness of roll is 55HRC) with WC17Co using HVOF. 
The coating looked good but, when it is put into operation, it has random spot peel off (looks like localized bonding issue)Picture

Pretreatment: The roll was blasted by silicon carbide because it was very hard (Alumina oxide cannot blast it). 
We blasted it to 9 Ra but we are not really confident about the blasted texture profile on the substrate surface. 
After that, we sprayed 75B as a bond coat layer before spraying HVOF.

Now, the blasted texture profile of silicon carbide is our main suspect

Anybody has some suggestions ?

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  spares
Posted by: paint@insteelonline.co.uk - 03-03-2021, 01:48 PM - Forum: Products and Services - No Replies

hi Guys i`m after spare parts for metco 11e gun ie nozzles,air caps and 0 rings thanks

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  SPARE PARTS FOR TYPE DJ2700 GUN
Posted by: Manju_AMST - 02-22-2021, 04:23 AM - Forum: Products and Services - No Replies

Hi Thermal spray users, we offer all parts for type DJ2700 gun. you can see the quality of the nozzle. all parts are ready stock available. 

For pricing, please write to sales@alloymstech.com or marketing@alloymstech.com



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