New technique could make nickel as strong as titanium
A new technique that allows metals to mimic the internal structure of wood could make nickel, and other metals, far far strong.
Led by James Pikul, Assistant Professor in the Department of Mechanical Engineering and Applied Mechanics at Penn Engineering, the new study looked at new ways to take metal and give it the porous structure that gives wood its strength. In the past, this has been done by finding ways to turn molten metal into foam, or using 3D printing with hundred-nanometer precision to build up wood-like metal bit by bit. The problem is that metal foam is crude by modern engineering standards, while the 3D printing process is slow and very hard to scale up from lab-bench scales.
“The reason we call it metallic wood is not just its density, which is about that of wood, but its cellular nature,” Pikul says. “Cellular materials are porous; if you look at wood grain, that’s what you’re seeing – parts that are thick and dense and made to hold the structure, and parts that are porous and made to support biological functions, like transport to and from cells. Our structure is similar. We have areas that are thick and dense with strong metal struts, and areas that are porous with air gaps. We’re just operating at the length scales where the strength of struts approaches the theoretical maximum.”
According to the researchers, the key was to go to much smaller scales to produce much greater increases in strength. They manage this by suspending plastic spheres a few hundred nanometers wide in water, which is allowed to evaporate. As the water disappears, the spheres drop into a neat geometrical, crystalline pattern. This is then electroplated with a thin layer of chrome and the spaces between the spheres are filled with nickel. The plastic is then dissolved, and what’s left behind is an open network of metallic struts with 70 percent empty space – making it light enough to float in water.
The process is however very expensive, and so far has only produced some very small samples.
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A new technique that allows metals to mimic the internal structure of wood could make nickel, and other metals, far far strong.
Led by James Pikul, Assistant Professor in the Department of Mechanical Engineering and Applied Mechanics at Penn Engineering, the new study looked at new ways to take metal and give it the porous structure that gives wood its strength. In the past, this has been done by finding ways to turn molten metal into foam, or using 3D printing with hundred-nanometer precision to build up wood-like metal bit by bit. The problem is that metal foam is crude by modern engineering standards, while the 3D printing process is slow and very hard to scale up from lab-bench scales.
“The reason we call it metallic wood is not just its density, which is about that of wood, but its cellular nature,” Pikul says. “Cellular materials are porous; if you look at wood grain, that’s what you’re seeing – parts that are thick and dense and made to hold the structure, and parts that are porous and made to support biological functions, like transport to and from cells. Our structure is similar. We have areas that are thick and dense with strong metal struts, and areas that are porous with air gaps. We’re just operating at the length scales where the strength of struts approaches the theoretical maximum.”
According to the researchers, the key was to go to much smaller scales to produce much greater increases in strength. They manage this by suspending plastic spheres a few hundred nanometers wide in water, which is allowed to evaporate. As the water disappears, the spheres drop into a neat geometrical, crystalline pattern. This is then electroplated with a thin layer of chrome and the spaces between the spheres are filled with nickel. The plastic is then dissolved, and what’s left behind is an open network of metallic struts with 70 percent empty space – making it light enough to float in water.
The process is however very expensive, and so far has only produced some very small samples.
The support of my readers through the years has given me the freedom and ability to analyze objectively the ongoing renaissance in space, as well as the cultural changes -- for good or ill -- that are happening across America. Four years ago, just before the 2020 election I wrote that Joe Biden's mental health was suspect. Only in this year has the propaganda mainstream media decided to recognize that basic fact.
Fourteen years ago I wrote that SLS and Orion were a bad ideas, a waste of money, would be years behind schedule, and better replaced by commercial private enterprise. Even today NASA and Congress refuse to recognize this reality.
In 2020 when the world panicked over COVID I wrote that the panic was unnecessary, that the virus was apparently simply a variation of the flu, that masks were not simply pointless but if worn incorrectly were a health threat, that the lockdowns were a disaster and did nothing to stop the spread of COVID. Only in the past year have some of our so-called experts in the health field have begun to recognize these facts.
Your help allows me to do this kind of intelligent analysis. I take no advertising or sponsors, so my reporting isn't influenced by donations by established space or drug companies. Instead, I rely entirely on donations and subscriptions from my readers, which gives me the freedom to write what I think, unencumbered by outside influences.
Please consider supporting my work here at Behind the Black.
You can support me either by giving a one-time contribution or a regular subscription. There are five ways of doing so:
1. Zelle: This is the only internet method that charges no fees. All you have to do is use the Zelle link at your internet bank and give my name and email address (zimmerman at nasw dot org). What you donate is what I get.
2. Patreon: Go to my website there and pick one of five monthly subscription amounts, or by making a one-time donation.
3. A Paypal Donation:
5. Donate by check, payable to Robert Zimmerman and mailed to
Behind The Black
c/o Robert Zimmerman
P.O.Box 1262
Cortaro, AZ 85652
You can also support me by buying one of my books, as noted in the boxes interspersed throughout the webpage or shown in the menu above. And if you buy the books through the ebookit links, I get a larger cut and I get it sooner.
tangentially:
processing titanium-
The Armstrong Method
Oak Ridge National Lab
https://youtu.be/73HLzYuIfx0
1:37
The Kroll Method
Oak Ridge National Lab
https://youtu.be/oWyrzZh3We0
4:58
and…..
Dr. Roger Penrose
Forbidden crystal symmetry in mathematics and architecture
Royal Institution lecture 2014
https://youtu.be/th3YMEamzmw
58:13
“Dr. Roger Penrose provides a unique insight into the “forbidden symmetry” of his famous penrose tiles and the use of non-repeating patterns in design and architecture.
It is a rigorous mathematical theorem that the only crystallographic symmetries are 2-fold, 3-fold, 4-fold, and 6-fold symmetries.
Yet, since the 1970s 5-fold, 8-fold, 10-fold and 12-fold “almost” symmetric patterns have been exhibited, showing that such crystallographic “forbidden symmetries” are mathematically possible and deviate from exact symmetry by an arbitrarily small amount.”
We get closer to Star Trek’s transparent aluminum.
Phill O
Excellent obscure cultural reference!
I can’t resist….
Star Trek IV The Voyage Home
“Transparent Aluminum”
https://youtu.be/xaVgRj2e5_s
4:44
What is additionally fascinating about all this– we have no idea what magical substances we could engineer in low or zero G.
Nice technology! The weight penalty would still exist. Equal volumes and structures of Nickel would still weigh more when compared to Titanium. It’s great progress though!
I wonder about strength improvements using similar structures, but with Titanium as the metal?