Hi, can anyone help me I want to calibrate a Surfcom 120A and we have lost the manual Carl Ziess can not replace the manual? so really stuck at the moment.
Regards Bazza
dorsetprecision.co.uk

Dear gordon,

i woulld like to know the formula to calculate the price for WCCo (HVOF) coating.

Where can i find the value of density of powder metal and coefficient (yield rate) for WCCo, WCCoCr, Hastelloy-c, Stellite 6, SS316 and etc?

Regards,
minja

Hello Forum members,

I had a query regarding Nickel Aluminide Coating on Platinum.

We need a ceramic coating on the platinum component to reduce its material loss. As per standard procedures a ceramic coating like alumina will require Ni-Al or Ni-Cr bond coat.

however, the client from his previous experience belives that Nickel and Aluminium react with Platinum at higher temperatures causing it to melt before BP. He is not very sure about it though.

I wanted to know if

1. Ni-5Al would actually react with platinum at high temperatures (1000-1200C)?

2. Would the coating fail if we donot apply the bond coat? the component is not exposed to any abrasion or any other relative action but the operating temperature is around 1000C.

I appreciate your inputs..

Regards

K09

I was reading something related to surface energy of plastics. And I came across a self made conclusion: Amorphous thermoplastics have high surface energy while Semi-crystalline thermoplastics have low surface energy. I need to know am I right or wrong? and what is the reason behind a plastic having high or low surface energy? Please help me with your expertise.

Thanks in advance
Himanshu

Hi all,
I would like to have a better understanding of the relationship between amps and 2ndry gas changes to increase or decrease voltage. Is one option more prefered/desireable and under what circumstance would you choose one over the other. Thanks

Bigals

Please can someone give me some of the mechanical design considerations in the design of a remote handling machine to deploy tooling in a hazardous environment?

Thanks

Hi all,

The part which it was cold-plated by NiCrBSi powder and has about % 30 porosity. We think that heating the cold-plated part in the furnace.
- What can we do decrease of porosity on the cold-plated part?
- What can we use furnace atmosphere for heating cold plated part?

Kind Regards

Hi all, I'm using a Sulzer F4 APS gun with 7MC cabinet and experiencing premature electrode wear/failure resulting in 'spit' marks on coatings during trials. I've attached some photos and would appreciate some pointers, based on the photos, of what to investigate first regarding the short electrode life. I'd prefer to hear your comments before stating the operating paramaters in use. The photos show a typical nozzle/electrode which has been in use for approximately 30 hours with 60 start-ups. Each start-up is at a lower current that operating current and gradually increased to operating current over the course of 5-10 seconds, i.e. not starting at full whack!

   

   

   

   

   


Thanks for any comments you may have.

Dear sir,

I am a beginner in a thermal spray field, have serviced in a roll manufacturing company.
I got a question and wonder if anyone can help.
I am doing a job and need to find a way to work Cr3C2-20NiCr thermal spray with GTV K2 HVOF gun after grinding fluted roll.
The roll is hollow bar same as tube shape, out dia 320mm.
Flute's height is about 2.5 to 4.8mm, several kinds of small module teeth.

I cannot to seem to think of any way during thermal spray to prevent lamination in the coating layer on side wall and bottom of flutes.
There are little difference, lamination is located in middle of coating layer on the side wall.
And that is located between substrate and coating layer.
So coating layer is not dense.
Maybe there are much residual stress by rapid cooling both of layers in my guess.
But top of the flutes have adequate coating layer, HV0.2 1030-1100 level.

The coating condition is same as belows.
powder size : +30-10 micro m
oxygen flow : 910 lpm
kerosene : 22.5 lph
substrate preheating : around 30℃ (one pass by HVOF gun)
powder feed : 70g/min
pass : 5 pass
distance : 280mm
coating thickness : top- 50/60 micro m, side wall- 38/46 micro m, bottom- 121/131 micro m

I was wondering if anyone can give any comments or other suggestion.
However I am not sure of the working principle and need help cause I might have to build it.

Thanks a lot

Simon

kimsimon@empas.com

Hi Everyone,

Questions on an application in an Electrolytic Galvanizing Line Plant (EGL).

Component Name: Conductor Roll (diameter 600 mm, face length 4000 mm)

Roll has a coating or cladding of copper on the outside diameter (at least 10 mm thick) for conducting electricity during the plating process.

The top layer (over the Copper) is typically Chrome plating (web search shows this is often replaced with an HVOF coating)

My big question: Other than copper plating the roll, is there a Thermal Spray or Welding method and material that will satisfactorily replace the copper. I am directing this question to those of you out there who have experimented, and understand the function of the roll, and know the degree of purity of the copper cladding required. Thank you in advance for you help.