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improving 72FNS microstru...
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06-30-2009 09:29 PM
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F50TF50 bond coat
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substrate deformation of ...
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Can CP 1 or 2 Grade Ti be...
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Ti-Al powder
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Surface treatement for hi...
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stainless and cor-ten ste...
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Civil Engineering
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Various Metco Plasma Spar...
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Long Course-Thermal Spray
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machine of plasma coating
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06-15-2009 08:25 PM
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Rolleyes improving 72FNS microstructure
Posted by: bigals - 06-30-2009 04:30 AM - Replies (2)

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
B[/font]

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Thumbsup Online Guide for Mechanical Industry
Posted by: Rony Lee - 06-29-2009 06:05 AM - No Replies

Hello friends,
Today I want to tell you something interesting about online Mechanical Engineering.
Mechanicalebook.com is an online exclusive reference and handbook for Mechanical Engineering Industry. This website has technical description in details, question answers on several topics in Mechanical Engineering, from Screw to Jet Engine. Additionally you will also find Charts which you can take print out, Formula’s and Calculator Tools Online, Technical Definitions, Videos on advance topics and to test your knowledge we have engineering Quiz and much more.

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  substrate deformation of WC coating in gate valve
Posted by: ehsan - 06-28-2009 12:19 PM - No Replies

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 ...)

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  Jet Kote O2 and H2 supply pressure requirements?
Posted by: Intel55 - 06-24-2009 06:06 PM - Replies (1)

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 Smile

Thanks

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  stainless and cor-ten steels
Posted by: noodle - 06-22-2009 02:44 PM - Replies (1)

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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  Civil Engineering
Posted by: Damianmartin - 06-22-2009 08:11 AM - No Replies

Civil engineering deals with a variety of construction and maintenance tasks, like building and maintaining roads, bridges, tunnels, buildings, airports, dams, water works, sewage systems and ports. A civil engineer not only requires a high standard of engineering knowledge, but also supervisory and administrative skills. The work involves planning, constructing and maintaining. Civil engineering is ideal for those who love to create and the job is monetarily rewarding and involves a lot of responsibility. An engineer is directly responsible for public safety and welfare. Safety should be the first priority of any engineer. If they are involved in constructing residences, they have to follow the safety precautions involved too. In the case of a highway, they are expected to follow traffic safety rules. Engineers have to look out for potential hazards, including environmental impacts and estimated life expectancy of the project. Natural disasters make it important for engineers to be extra cautious about environmental pressures. To begin a career in civil engineering, you need to complete a formal school education, including core courses in English, Algebra, Geometry, Advanced Math, Physics and a foundation in History and Social Studies. In college, a student needs to earn a Bachelor's degree. Pursuing a Master's Degree is necessary. According to a recent survey, more than 35% students who have acquired a Bachelor's degree go on to enroll for a Master's, even as they continue to work. Many students prefer to work and earn at the same time because that can earn them a tuition reimbursement. Acquiring a Master's degree or a PhD helps a student to specialize in the field. The road to complete a civil engineering course is endless and that is why many professionals choose to keep on learning the latest trends in the construction business via special programs developed by universities and professional societies like the American Society of Civil Engineers. The annual earning of a civil engineer is anywhere between $43,000 to $90,000, depending on specialization and experience.
[URL="http://www.Guruengineers.com"]Civil Engineer[/URL]

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  Surface treatement for high-friction interface with human hair
Posted by: davidHMC - 06-17-2009 08:37 PM - Replies (2)

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

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  machine of plasma coating
Posted by: joanwang - 06-11-2009 03:09 PM - Replies (2)

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!

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  pencil hardness and tukon hardness test
Posted by: transit - 06-09-2009 03:25 PM - Replies (5)

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

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  Hot corrosion/erosion of metal
Posted by: Operator Mike - 06-09-2009 03:03 PM - Replies (4)

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.

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