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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)


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,

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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)

The Shark Apex Uplight Lift-Away Duoclean - The special Features


We are sure that these shark apex uplight lift-away duoclean vacuums will satisfy most of your requirements if you are looking for a cheap, lightweight stick vacuum with excellent performance.

For a long time, Shark's reputation and sales numbers were dominated by its famous upright vacuums, such as the Shark Navigator and Rotator.

Let's look at why these lightweight stick vacuums have become one of the most common and high-rated stick vacuums on the market today.

Special Features

This UpLight vacuum cleaner combines the best of both worlds, providing the powerful suction of upright vacuums with the flexibility of a stick machine. The following are the primary characteristics that distinguish this new model as an excellent option for your house.

[Image: FpbZwez.jpg]

Powerful Cleaning

The manufacturers have created An airflow of 66 CFM for the Shark apex uplight corded lift away. It has two innovations for high suction: the streamlined channels, which increase airflow speed, and the digital high-spin motor.

The increased flow of air is referred to as Hyper-Velocity suction by the manufacturer. With this feature, the vacuum can clean nearly any surface in your house, including eliminating dirt from various kinds of carpets.

HEPA Filter And Anti-Allergen System

This vacuum provides excellent protection against allergies and other contaminants. It is a completely sealed device, which prevents particles from escaping once the cleaning head has cleaned them up.

The HEPA filtration system and a dust cup that opens downward complete the allergy protection configuration. These precautions will prevent allergens from getting into your house and are safe for people who are sensitive to particles such as dirt and other allergens.

DuoClean Technology

In recent years, this function has become highly popular, and you can find it on many Shark vacuums. A soft roller brush is added to the front of the cleaner head due to this technology. As a result, there are two brushes on the cleaner head.

The extra soft roller brush can pick up bigger dirt more efficiently, and it also performs a fantastic job on bare floors when used in conjunction with the vacuum.

Long Reach And Lift-Away Technology

A removable pod is included with the vacuum. The extended, built-in hose on the lift-away is one of the many features that will amaze you about it.

When completely extended, the hose has a reach of 4 feet 2, allowing you to clean various surfaces such as staircases, vehicle interiors, sofas, and other comparable areas with relative ease.

You may also use the vacuum's wand to increase the reach of the suction, which is very useful for cleaning high areas. The lift-away vacuum cleaner comes with everything you need to vacuum, including a strong suction and a dustbin.

The ability to attach various attachments increases its flexibility, enabling you to clean delicate and difficult-to-reach areas with ease.

Zero-M Technology

We have a few Shark vacuums with Zero-M Technology, and they all perform an excellent job of cleaning the brush roll.

The technology is based on a customized brushroll that prevents hair from wrapping around it too tightly. It also features a comb-like device that combs the hair out of the brushroll and delivers it to the dust canister for disposal.

However, you should note that it may become tangled if your brush roll contains a lot of pet hair.

[Image: a4k6Lj2.jpg]

Dust Canister

The dust container may be easily removed and emptied. It is, however, on the small side, with a capacity of just 0.68 quarts. As a result, a more giant canister would be expected to reduce the frequency of cleaning.


To summarize, we would suggest the Shark apex uplight lift-away duoclean vacuum for a variety of reasons: its strong suction, two brush rolls, lift-way design, and flexible attachments, the vacuum can clean any area of your house.

Except for the relatively tiny dustbin, this new vacuum meets the cleaning needs of most households. Last but not least, it is reasonably priced.

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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

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


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,

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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

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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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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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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