Adhesive wear in two rubbing teflon hoses
Adhesive wear in two rubbing teflon hoses
(OP)
Hello, I was hoping someone could lead me to information regarding what I believe is called "homogenous adhesive wear". It's the tendancy for a material rubbing up against a component of the same material to wear and chafe faster than if two different materials were wearing. This is most common in polymers, I believe. In our case, it has to do with teflon hoses.
I learned about this in college, briefly, while working on a friction project. The TA mentioned it in passing, and it hasn't come up again until now, so I don;t even know how accurate this information is. A cursory survey has turned up nothing.
We are looking for alternative solutions, but we would like something for our records.
Any and all information is greatly appreciated.
Thank you so much for your help.
I learned about this in college, briefly, while working on a friction project. The TA mentioned it in passing, and it hasn't come up again until now, so I don;t even know how accurate this information is. A cursory survey has turned up nothing.
We are looking for alternative solutions, but we would like something for our records.
Any and all information is greatly appreciated.
Thank you so much for your help.





RE: Adhesive wear in two rubbing teflon hoses
If it rubs, it's just a matter of time before something fails.
TTFN
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RE: Adhesive wear in two rubbing teflon hoses
the phenomenon is not restricted to polymers, but can also seen with metals.
the best way to avoid the problem is to prevent any chafing at all, if that is not possible materials with a different nature or coating one of the two components may help, as will also the use of a suitable lubricant.
you should google for polymer compatibility - you will find a lot of links dealing with contact phenomena between various materials - also the supplier of the hoses might be able to give some useful advice.
RE: Adhesive wear in two rubbing teflon hoses
RE: Adhesive wear in two rubbing teflon hoses
You might search on Teflon hose chaffing.
RE: Adhesive wear in two rubbing teflon hoses
Friction is much different between thermoplastics, than thermoplastics rubbing on metal. Particularly at elevated temperature. Wear rates will increase measurably. Sorry, I found no reference to temperature in this thread.
But, even at room temperature, as you would expect, thermoplastics have low modulus. Under load, their asperities will deform measurably. Whereas, with thermoplastics rubbing against metal, it's both adhesion and deformation. Friction will decrease disproportionately more with higher load, proportionally with speed.
Here are some clues to help you find the failure mode: If you see fine debris it's an indication surface wear is adhesive-related and normal. But if you see gouges, the presence of melted polymer, wear is abrasive, P-V limits of your materials have been exceeded.
My background is coatings. Though you know these theories are applicable to materials in general. For more help, see:
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Best wishes.
William Gunnar
http://www.IndustrialCoatingsWorld.com
RE: Adhesive wear in two rubbing teflon hoses