bearingsteel,
Is this a reconditioned roller or a new part? Do you know what condition the material was in before the heat treat cycle?
MH
http://www.linkedin.com/pub/luke-autry/1b/510/566
macPT,
In just H2O, the Al2O3 coating is pretty stable. Halogens in solution will destabilize the oxide film and initiate corrosion. Grounding the Al plate, would place the plate at the potential of the surroundings and that would only facilitate charge flow and not hinder it. Get a car...
bearingsteel,
Please provided the steel composition (I'm guessing AISI 52100) and magification. All I can see are carbides and no contrast from individual grains. Thanks
MH
http://www.linkedin.com/pub/luke-autry/1b/510/566
ttwowaymonologue,
When testing is carried out in air, the oxides that form on the surface play important roles. The superficial hardness of the wear couple dictates the real contact area and the extent of plastic contact (the plasticity index). The real contact area controls how much force can...
mfgenggear,
I cannot comment on the absolute flaw size that is detectable because it depends on the frequency, probe size, and technique used. If the probe is fixed you don't have to worry about any lift-off effects and the only changes (in terms of impedance) you will see on the scope are due...
wayneter,
How are you preping the surfaces prior to brazing? I would degrease followed by a activation/acid-dip to remove the surface oxide films. In the brazing furnace back-fill a N2/H2 (3-5% H2) reducing atmosphere several times. During the brazing process, the copper should remain bright...
Marsh91,
Since beryllium has little solubility in Al the beryllium phase will oxidize just like elemental beryllium. My suggestion is to talk to an application engineer at Materion about toxicity concerns.
MH
http://www.linkedin.com/pub/luke-autry/1b/510/566
There is a company called Materion that commercialized these alloys in wrought form. Might be a good fit as long as the temperature isn't too high.
When I was talking about cooling I was referring to any cooling loads put on the part.
MH
http://www.linkedin.com/pub/luke-autry/1b/510/566
Marsh91,
Have you checked out the Al-Be MMCs? Might be a little low on the temperature requirement though, however I wouldn't think the metal component would actually reach the temperature of the exhaust if it's being cooled.
MH
http://www.linkedin.com/pub/luke-autry/1b/510/566
I've had some really good and practical professors who were never licensed. The reality is that many engineers in my field are not licensed and industry doesn't institute licensing requirements. As a result, there is no motivation to get a PE for materials engineers. Also, I'm not convinced that...
The plastic deformation effects from the bending can be separated out using a reference sample. For instance, you can run two simultaneous tests (sample plus known reference inspected by eddy current, ultrasound, etc.). You will get two V-out values at the exit leads, which are fed into the...
chrisperry12345,
The resistance changes are going to be determined by the constriction resistance associated with the crack, which goes rho/2a where a is the diameter of the constricted area. That calculation is for circular constricted geometries, but you might want to dig around for other...
unclesyd,
How much contact resistance does a Magnitite coating give you? I ask because the OP needs a stable electrical contact during a sliding application. When semi-conductors start wearing the contact resistance skyrockets due to constriction effects, which results in a noisy contact.
MH...
