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The Junk Drawer
- Thread starter Jimdamick
- Start date
printer
Well-Known Member
On another forum someone was saying that the wiring to an electrical outlet was stressed and the metal crystallized and then cracked. I said all metals have a crystals but we do not normally see them (galvanized heating ducts will show the zinc crystals). I looked through my pictures and found a Polaroid (boy, does that date things) when I took a course in metallurgy. The metal is a high tech alloy from a rack used to place parts on and then heat treated. After so many cycles it is starting to develop stress corrosion cracks. I polished the sample to a mirror surface and then etched the metal to show the crystals. I really liked that job, learned a lot of things.
DIY-HP-LED
Well-Known Member
They had issues with aluminum wiring with oxidization and other corrosion causing resistance and warming things up, thermal cycling them at specific locations. I was reading an article about how they grow turbine blade blanks from a single crystal of alloy these days, no grains there!On another forum someone was saying that the wiring to an electrical outlet was stressed and the metal crystallized and then cracked. I said all metals have a crystals but we do not normally see them (galvanized heating ducts will show the zinc crystals). I looked through my pictures and found a Polaroid (boy, does that date things) when I took a course in metallurgy. The metal is a high tech alloy from a rack used to place parts on and then heat treated. After so many cycles it is starting to develop stress corrosion cracks. I polished the sample to a mirror surface and then etched the metal to show the crystals. I really liked that job, learned a lot of things.
printer
Well-Known Member
The poster had copper wiring, Aluminum wiring was a dumb idea although they produced fastening systems so it could be used. Don't use copper devices with aluminum wire. I never knew about the turbine blades, pretty interesting.
Each Blade a Single Crystal
Clever casting techniques produce jet engines that can withstand 2,000-degree temperatures, allowing unprecedented efficiency.
www.americanscientist.org
On another forum someone was saying that the wiring to an electrical outlet was stressed and the metal crystallized and then cracked. I said all metals have a crystals but we do not normally see them (galvanized heating ducts will show the zinc crystals). I looked through my pictures and found a Polaroid (boy, does that date things) when I took a course in metallurgy. The metal is a high tech alloy from a rack used to place parts on and then heat treated. After so many cycles it is starting to develop stress corrosion cracks. I polished the sample to a mirror surface and then etched the metal to show the crystals. I really liked that job, learned a lot of things.
All this science yet Closed Captioning couldn't yield what OJ was saying.The poster had copper wiring, Aluminum wiring was a dumb idea although they produced fastening systems so it could be used. Don't use copper devices with aluminum wire. I never knew about the turbine blades, pretty interesting.
Each Blade a Single Crystal
Clever casting techniques produce jet engines that can withstand 2,000-degree temperatures, allowing unprecedented efficiency.
DIY-HP-LED
Well-Known Member
If that geothermal scheme using a gyrotron to drill deep works out, they could use this technology to up the heat level steam turbines operate at, though the alloys and parameters might be a bit different. We will probably find out in a couple of year if this is feasible and if it is, it could be disruptive to the renewable energy market, though batteries would be used for peeking and load management. It might not be able to be used everywhere, but where is is, it can convert fossil fueled power plants into geothermal ones in a hurry for not too much in power to drill the glass lined holes either. The drill pipe is a waveguide for the millimeter radiation of the gyrotron mounted at the wellhead. Serious people from MIT formed a company and their idea looks pretty good, on paper and with limited tests.The poster had copper wiring, Aluminum wiring was a dumb idea although they produced fastening systems so it could be used. Don't use copper devices with aluminum wire. I never knew about the turbine blades, pretty interesting.
Each Blade a Single Crystal
Clever casting techniques produce jet engines that can withstand 2,000-degree temperatures, allowing unprecedented efficiency.
Millimetre-wave beams could give us access to deep geothermal energy
Optimised for fusion research, millimetre-wave beam technology could be adapted to access the heat that lies several kilometres below Earth's surface, says Eugene Linden
Experts optimistic about converting coal plants to production of clean geothermal energy | AltEnergyMag
As the world moves away from fossil fuels in the battle against climate change, could coal plants be repurposed to produce renewable geothermal energy? Panelists addressing the topic at PIVOT2022, a recent weeklong geothermal conference, were excited about that potential.
www.altenergymag.com
DIY-HP-LED
Well-Known Member
Can you think of any other applications for single crystal alloys in his stressful thermal environments? I'm sure there will be many applications and in a way it is similar to the way they grow single crystal pure silicone billets for wafers. How about valves for high performance aero and racing engines? Perhaps brushless electric motors with incredible rpms before the fly to pieces.The poster had copper wiring, Aluminum wiring was a dumb idea although they produced fastening systems so it could be used. Don't use copper devices with aluminum wire. I never knew about the turbine blades, pretty interesting.
Each Blade a Single Crystal
Clever casting techniques produce jet engines that can withstand 2,000-degree temperatures, allowing unprecedented efficiency.
Another interesting technology to check out that is potentially game changing are the breakthroughs in niron magnets, Niron Magnetics.
Iron Nitrides: Powerful Magnets Without The Rare Earth Elements
Since their relatively recent appearance on the commercial scene, rare-earth magnets have made quite a splash in the public imagination. The amount of magnetic energy packed into these tiny, shiny …
Lucky Luke
Well-Known Member
Lucky Luke
Well-Known Member
DIY-HP-LED
Well-Known Member
Looks like we could have King Charles by the end of the week, the old girl is getting near the end. People spent an entire lifetime with this ceremonial head of state and she was the last of the WW2 generation and it shaped her values and life. She was well loved by a majority of the population and even if they did not agree with monarchy most figure she did the job well. I mean when compared to King Donald the first of America, who was deposed, but is yet to be beheaded...
Katty Kay: Queen Elizabeth Has Held The Monarchy Immaculately
5,209 views Sep 8, 2022 The BBC's Katty Kay joins Morning Joe to discuss a statement from Buckingham Palace that Queen Elizabeth's doctors are concerned for her health.
Katty Kay: Queen Elizabeth Has Held The Monarchy Immaculately
5,209 views Sep 8, 2022 The BBC's Katty Kay joins Morning Joe to discuss a statement from Buckingham Palace that Queen Elizabeth's doctors are concerned for her health.
Unclebaldrick
Well-Known Member
I was driving recently and I heard an NPR story on peak pricing with Ticketmaster. The spokesman was talking about how "most tickets are under $200, and that's a reasonable price to see live top talent". I spit coffee out on the dashboard. Damn, I'm old, but all the best shows I have ever seen in my life cost under $40.
Excited for the next one. True sailing is dead.
Excited for the next one. True sailing is dead.
DIY-HP-LED
Well-Known Member
1000 Drones Flying at Burning Man 2022
48,667 views Sep 3, 2022 A new record for Burning Man. Thank you to Drift Studios and the 10 artists that produced this gift for the playa. You can see a grid of charging pads that the drones return to for recharging. This allows the show to go on for hours. The scale is immense, and visible from quite a distance. The physical movement limits of the drones lends itself to fluid motion and mesmerizing organic forms.
DIY-HP-LED
Well-Known Member
cannabineer
Ursus marijanus
way to get high!
DIY-HP-LED
Well-Known Member
HEMPEARTH's - HEMP PLANE - DEREK KESEK
HEMPEARTH - See what USA Today, The Toronto Star, The Discovery Channel's Daily Planet, HIGH TIMES, CNN, and others are talking about.
hempearth.ca
Roger A. Shrubber
Well-Known Member
cannabineer
Ursus marijanus
I cannot find info on the engines. They are either Diesel piston engines or tiny turboprops. I’m guessing the first: cheaper to build and to operate.
Lucky Luke
Well-Known Member
How does your state/small country fair?
app.electricitymaps.com
Live 24/7 CO₂ emissions of electricity consumption
Electricity Maps is a live 24/7 visualization of where your electricity comes from and how much CO2 was emitted to produce it.
app.electricitymaps.com