PDA

View Full Version : Palladium & Silver makes glass stronger than steel.



What is Truth?
5th August 2011, 19:03
just not mainstream..

Strange New Glass Proves Twice as Durable as Steel

Engineers have long sought a material with the strength of glass and the toughness of metal. But the two properties are virtually mutually exclusive. Strong, rigid materials tend to be brittle (think glass), while tough ones that resist shattering are often malleable (think copper). Now Caltech materials scientist Marios Demetriou and colleagues have created a glass made from metals that double the combined strength and toughness of the best-performing steel, the benchmark alloy for damage tolerance. "After trying 109 different combinations of elements, we have broken this barrier," Demetriou says.

Interestingly, Demetriou's new brand of metallic glass draws its strength from its main weakness. After melting and combining the precious metals Palladium and Silver with other ingredients, rapid cooling of the product freezes the atoms into a chaotic arrangement resembling that of glass. As in conventional glass, stress rearranges the atoms into deformations called shear bonds. But instead of growing into destructive cracks, as happens in glass, the bonds aggressively multiply and interlock, forming a shield against cracks.

Eventually, Demetriou hopes to replicate the new alloy's properties using less costly metals - Palladium and Silver make it about 1000 times as expensive as steal. An iron-based metallic glass, for example, could be used to make vehicle bumpers impervious to dents or nearly indestructible airplane parts. In the short term, Demetriou's Palladium [and Silver] alloy could find its way into dental implants that resist scratching and never need replacement.

Author: Sarah Stanley
Discover Magazine May 2011 Page 14

billmr
5th August 2011, 21:28
that is cool, but the reason people are not using aluminum oxynitride is that it costs $10 per square inch, I wonder what this stuff will cost ?

on the other hand, indestructible transparent robots might be cool, unless they were misused somehow

robotics toolkit (http://www.microsoft.com/robotics/)

Mizzle
5th August 2011, 22:04
This story reminds me of carbon nanotubes.
Sure, they are great, but can they produced on a usable scale. This story doesn't talk about the amount which was produced or the feasibility of making the material.