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Latest Threads
SSPC-SP 10 or ISO 8501
Forum: Surface Engineering Threads
Last Post: allonmorris
01-24-2022, 02:53 AM
» Replies: 0
» Views: 83
Metco 58NS CuNiIn Interfa...
Forum: Surface Engineering Threads
Last Post: Vadim Verlotski
01-08-2022, 09:05 AM
» Replies: 15
» Views: 1,172
Spark Issue on DJ2600 HVO...
Forum: Surface Engineering Threads
Last Post: xxxxmgulkokan
01-06-2022, 02:38 PM
» Replies: 0
» Views: 157
Corrosion Problem on HVOF...
Forum: Surface Engineering Threads
Last Post: Vadim Verlotski
01-06-2022, 12:51 PM
» Replies: 3
» Views: 241
Tungsten Carbide Microfin...
Forum: Surface Engineering Threads
Last Post: Stephen Booth
12-29-2021, 09:00 AM
» Replies: 13
» Views: 13,582
Diamond Belt Grinding Too...
Forum: Products and Services
Last Post: Stephen Booth
12-29-2021, 08:59 AM
» Replies: 5
» Views: 487
Diamond Grinding
Forum: Surface Engineering Threads
Last Post: Stephen Booth
12-29-2021, 08:58 AM
» Replies: 6
» Views: 6,989
finishing WC HVOF coating
Forum: Surface Engineering Threads
Last Post: Stephen Booth
12-29-2021, 08:57 AM
» Replies: 6
» Views: 7,594
mud drilling equipments
Forum: Surface Engineering Threads
Last Post: Stephen Booth
12-29-2021, 08:55 AM
» Replies: 19
» Views: 17,984
Thick insulating coating ...
Forum: Surface Engineering Threads
Last Post: Stephen Booth
12-29-2021, 08:52 AM
» Replies: 3
» Views: 194
Metco 45VF-NS Finishing
Forum: Surface Engineering Threads
Last Post: ServiceTech
12-17-2021, 10:33 PM
» Replies: 3
» Views: 390
Cold Spray Process Develo...
Forum: Products and Services
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11-30-2021, 12:15 AM
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Tips to Compare Internet ...
Forum: Other Topics
Last Post: morganjin
11-19-2021, 12:13 PM
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Metco 5P II Parameters (M...
Forum: Surface Engineering Threads
Last Post: tobjung
11-15-2021, 05:23 PM
» Replies: 0
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Admirable Engineer
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10-26-2021, 01:46 PM
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Deleted
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10-22-2021, 02:28 PM
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Compare between Arc-Spray...
Forum: Surface Engineering Threads
Last Post: Vadim Verlotski
10-20-2021, 06:41 AM
» Replies: 1
» Views: 417
Good engineering blogs?
Forum: Other Topics
Last Post: morganjin
10-19-2021, 03:29 PM
» Replies: 8
» Views: 8,202
TAFA 8830/8835 manual
Forum: Products and Services
Last Post: strogonovd94
09-27-2021, 02:08 PM
» Replies: 0
» Views: 301
Thermal arc spray for sal...
Forum: Products and Services
Last Post: Leeboy007
09-22-2021, 10:08 AM
» Replies: 1
» Views: 1,007

 
  SSPC-SP 10 or ISO 8501
Posted by: allonmorris - 01-24-2022, 02:53 AM - Forum: Surface Engineering Threads - No Replies

Hello guys,

Anyone, have SSPC-SP 10 or ISO 8501 newest. I have project surface preparation in steam turbine power plant, with standard SSPC-10 or ISO 8501.

I read in internet that SSPC-SP 10 is procedure for blasting. But not explain how much roughness target for this standard.

Anyone, can help me ??

Thank you so much.

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  Spark Issue on DJ2600 HVOF Flame
Posted by: xxxxmgulkokan - 01-06-2022, 02:38 PM - Forum: Surface Engineering Threads - No Replies

Dear All;

We have Oerlikon multicoat system and we added the HVOF and Flame coatings. Now we are using Plasma HVOF and Flame process in the same cabin.

Therefore we have added new components and changed the gas lines.

Our problem is that  there are too many spark in the HVOF. We don't have any spark in the Plasma and Flame. Please watch the below video. Our gun is DJ2600 and gasses are oxgyen and hydrogen.

Oerlikon changed too many parts but there is no changing. In the flame there is no powder and we can see the diamond label in the flame. 

Is there any suggestion how we can fix the problem ?

https://www.youtube.com/watch?v=ysLMXH5EGj0

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  Corrosion Problem on HVOF Coating (DJ2600 Metco Gun)
Posted by: xxxxmgulkokan - 01-06-2022, 09:00 AM - Forum: Surface Engineering Threads - Replies (3)

Hi All;

I have corrosion problem on HVOF coating. I need your support please. 

We are using Oerlikon Multicoat system and the gun is DJ2600. 

Gasses are oxgyen and hydrogen. Powder is Metco 5847. Please see below informatin about powder. 

Nominal Chemistry
WC 10Co 4Cr
Nom. Particle Size Distr.(µm)
-53 +11

Primary Carbide Particle Size
Fine and Medium Size, Blend (TS Powders)
Range of Apparent Density (g/cm3)
2.9


The requirements are below and they are ok. 


Hardness is 900-1200 HV
Porosity must be under %1
Oxides must be under %1
There are no unmelts and cracks.

Before coating, we are applying the pre-heating and then blasted with white aluminum oxide. Size is 60 grit. Distance is 7 inch and pressure is 70 psi

We need to pass corrosion test. We coated the 4340 steel bar(200 KSI). Coupon diameter is 2.5 inch diameter and lenght is 5 inch. Coating thickness is 0.006" on surface. Spray distance is 11".

Uncoated end faces of cylindrical coupon and adjacent ¼” length of OD on both ends of coupon is sealed with sealant prior to the corrosion test.

Coupon is tested to 1000 hours (42 days) of Salt Fog exposure per ASTM B117 but we couldn't pass the corrosion test. We saw the corrosion after 35 days(maximum). 

We made a too much trial in a one year. We made the coupons with same parameters but some of them is resisting  only 10 or 15 days

I tried to upload coupon picture. You can see the small corrosion spot on the surface. Thank you very much for your attention.

https://ibb.co/kyQGnJn

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Lightbulb Thick insulating coating Al2O3 - APS 9MB
Posted by: Binhngo - 12-27-2021, 12:24 AM - Forum: Surface Engineering Threads - Replies (3)

Hello admins and forum members, 
I have been following the topics for a long time and learned a lot of useful knowledge for myself.
Today I have a problem that I really need your help with:
i need to make alumina insulating coating using APS with a gun 9MB, the finished size after grinding needs to reach 130mm in diameter. Alumina coating thickness need 0.5-0.7mm.
However, there is a problem that the size after being worn is only 127.4mm, which means it has been worn 1.3 mm in depth.
I'm thinking 0.8mm NiAl95/5 + 0.5mm Al2O3. Or 0.8 NiCr80/20 + 0.5 Al2O3.
Looking forward to your advice in this case.

Thank you.

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Question Metco 5P II Parameters (Metco 308)
Posted by: tobjung - 11-15-2021, 05:23 PM - Forum: Surface Engineering Threads - No Replies

Dear Forum,

I bought used Metco 5P II recently. Unfortunately, the manuals have been misplaced by predecessor.
Therefore, I don't have any technical bulletin with me. If anybody can provide me with those bulletin please. (Metco 308 especially)
It would be  much appreciated.

Thank you
Happy0193

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  Compare between Arc-Spraying and HVOF
Posted by: reyesryder - 10-20-2021, 04:17 AM - Forum: Surface Engineering Threads - Replies (1)

Hi everyone,

I compare between Arc-Spraying and HVOF to rebuild wear in the journal bearing areas of generator shaft of steam turbine:

The shaft RPM is 3000
Operating temperature is 90c
Material is 42CrMo4
Hardness required is 37 HRC

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  Diamond Belt Grinding Tool Post Grinding and Polishing
Posted by: Stephen Booth - 10-18-2021, 05:32 AM - Forum: Products and Services - Replies (5)


.pdf   KGS M1 Tool Post Grinder Diamond Grinding.pdf (Size: 445.63 KB / Downloads: 71) FAST AND ACCURATE ROLL GRINDING & FINISHING of HVOF Carbide Coatings

FAST AND ACCURATE DIAMOND BELT ROLL GRINDING & FINISHING from KGS
Diamond tools for rolls and cylinders Belts, strips and lapping films for grinding, removing and polishing of cylinders with hard coatings. Flexible diamond tools are easier to use, require less  operators skills, for more consistent and predictable results!

KGS Swiss launches a new line of Belt Grinders, tool post mounting. KGS DIAMOND  and I are promoting KGS Diamond Belts and belt grinders.  If you ever find need for HVOF hard coatings and grinding

If interested, let me know and I will get the local KGS professional to contact to you….  Stephen.booth@bexxonglobal.com[Image: fe29fb0b624567dbb927d57159c89778?AccessK...oworigin=1]

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  Metco 45VF-NS Finishing
Posted by: Steven P - 10-13-2021, 09:27 AM - Forum: Surface Engineering Threads - Replies (3)

Hi everyone. 

One of my clients has requested some advice on what method he can use to finish a coated diameter of Metco 45VF-NS applied by APS. 

He has a full suite of grinding and machining facilities available to him.

Any ideas or recommendations are gratefully received.

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  TAFA 8830/8835 manual
Posted by: strogonovd94 - 09-27-2021, 02:08 PM - Forum: Products and Services - No Replies

Hello!

Does anyone have a manual (for pistol or whole system) for TAFA 8830 (8835) or others gun?

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Lightbulb Metco 58NS CuNiIn Interface Problem
Posted by: johnrafiee - 09-09-2021, 10:12 AM - Forum: Surface Engineering Threads - Replies (15)

Dear member 

I am looking for a way to reduce/eliminate interface separation/oxide/voiding/cracking in plasma sprayed Cu-Ni-In Metco 58 NS. 
During our initial spray a years ago, we did not found any of this defect. It keep building up time to time with the same parameter.


Spray parameter as follow

Gun Type : SinplexPro 90
Nozzle Diameter, Ø : 9 mm
Powder Injector Diameter, Ø : 1.8 mm
Powder Injector Angle : 90°
Current : 380 Amps
Primary Gas, Argon : 45 NLPM
Secondary Gas, Hydrogen : 2 NLPM
Powder Carrier Gas, Argon : 2 NLPM
Powder Feedrate : 40 g/min
Spreader/Suction Type : NL 16/1.2
Stirrer Speed : 60%
Spray Distance : 90mm
Rotation Speed : 50RPM
TCP Speed : 1000mm/min

Surface preparation were made with Grade 70 aluminum oxide with roughness around Ra 2-4um applied to Ti 6Al-4V substrate. Edge has been round off to ensure risk of edge seperation can be reduced.

The problem now we found an oxide, seperation and cracking at the coating near the interface on certain FOV. Can refer to my photo attachment

We had done many try and error such as etch after blast, preheat the substrate prior to spray, preheat the powder before spray but the problem still insist


For metallurgy preparation, 

The test panel was directly mounted using epoxy with vacuum impregnation. No sectioning was made

Planar grind with 180 SiC and Fine grind from 220 until 4000 SiC,
2 minutes 1um diamond polishing with Silk and 45 Second OP-S with Nap Cloth. 
No change to grinding and polishing parameter since day 1st of spray.


<a href="https://ibb.co/SBvPdFd"><img src="https://i.ibb.co/SBvPdFd/1-branch-cracking.jpg" alt="1-branch-cracking" border="0"></a>

<a href="https://ibb.co/ZWb1SQQ"><img src="https://i.ibb.co/FgdqXQQ/2-kicrocrack.jpg" alt="2-kicrocrack" border="0"></a>

<a href="https://ibb.co/MnqPvWT"><img src="https://i.ibb.co/mJQhj1s/6-crack.jpg" alt="6-crack" border="0"></a>

<a href="https://ibb.co/0j5K2RC"><img src="https://i.ibb.co/0j5K2RC/2-branch-cracking.jpg" alt="2-branch-cracking" border="0"></a>

<a href="https://ibb.co/SBvPdFd"><img src="https://i.ibb.co/SBvPdFd/1-branch-cracking.jpg" alt="1-branch-cracking" border="0"></a>

Appreciate all the opinion and idea. Thank you

[Image: SBvPdFd][Image: ZWb1SQQ][Image: MnqPvWT][Image: 0j5K2RC][Image: SBvPdFd]

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