My first attempt at 72FNS came back with the following microstructure results:
Delamination - fail, integrity - fail, porosity - V4 as apposed to </=V3. All remaining results in limits including hardness.

Sprayed with 4" distance, Arg/Hydrogen, 15 sec cooling time between passes, GE nozzle, 73V 500Amps, 75nlpm primary gas, 3.8nlpm 2ndry gas, 7 nlpm carrier gas, 8.2 lbs/hr feed rate.

The machine is a metallisation system using a metco 9mb gun.

Any suggestions as to how I can improve on the above results and also, what are your thoughts on gas choice; is argon/ helium a better option??

Thanks
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Hello friends,
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Hi
Our customer that produce gate valve say that after several working opening/closing of gate valves we have some deformation of substrate of WC coating on the gate.this deformation is effect of seat on the coating substrate of gates(to be crushed). base material of gates in this kind is 4130 AISI with 25 HRC .is this possible that we have some heat treatment on gates before coating for solve this problem?(such as nitriding or ...)

What gas supply flows and pressure requirements are you using for the Jet Kote.

Someone was telling me O2 was 0-25 bar!!! and 3200scfh!!! and a 3/4" pipe.

They also had the H2 supply of 0-18 bar and 3200scfh (1500nlpm).

That sounds high to me. Most I have ever seen them run is 2100scfh.


anyway... can someone with JK experience enlighten me

Thanks

Hi,

I'm an architect with a query - I hope this is ok. Are there any bi-metallic issues with using stainless steel and cor-ten steel together? As they are both steel I would have thought not but I thought I'd check to be sure. The situation is stainless steel lettering mounted onto cor-ten as external signage.

Thanks.

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Hi all,

I am new to both this forum and the entire subject of surface engineering, so I apologize if this post covers something too simple or outright incorrect.

I am a college student and currently doing contracting work through my school. Our project requires us to create attachment methods for high end hair extensions. In order to create a high-friction interface, we planned to cover the inside of our attachment with asperities similar geometric properties to the surface of the hair itself. Thus, I need a surface with asperities on the scale of .5 to 5 microns.

This surface would need to be located on the inside of a tube about .06" in diameter and .2" long. The tube will be made of plastic (either polyurethane, polypropylene, HDPE or LDPE), so an ideal surface treatment would work on plastic. If necessary, I could probably bond a thin surface-treated insert to the inside of the tube.

I initially thought that plasma spraying would be appropriate for the job, but the only company that I spoke to said that the size and material posed too many problems. I've been looking into micro-abrasive blasting, but I am concerned that the asperities will be too large. Does anyone know of a way to do this kind of thing or raise friction somehow else?

Thanks,

David

Hello ,Everybody
Is it possible to turing the plasma coating sprayed with powder metco68F-NS although grinding is preferred?
How to determine the machine mode of plasma coating?Hardness is foremost factor?
Is it must to check the surface roughness after machine the coating?
Thanks a lot!

Hi,

Newbie here. I have this long-bugging question of how to correlate the traditional pencil hardness test to tukon hardness test for painted surface.

For example, a HB hardness from pencil could meant a 6 KHN from tukon and so on.

Thank you,
Eric from Univ. of Michigan

New to this forum. Would like to know thoughts on erosion of metal in air pollution control systems of a municipal sludge incinerator. Sludge burned is abnormal due to high phosphrous content. Reactor temperature is 1450 degrees F utilizing olivine sand as the fluid. High phosphorous content sludge agglomerates on sand and hardens.

Heat recovery units experience erosion/corrosion that lead to water tube leaks. Coated likely wear areas with a product that lasted 1 year. What are the best coating options?

Also looking at lime to soften the fly ash and bind SO2-SO3 specie.