Friday, October 11, 2019
Tuesday, September 3, 2019
I bought some HSS stub drills, and treated half of them with liquid nitrogen, which improved their wear resistance dramatically. I also look at the change in microstructure with an electron microscope.
Performance of cryogenically treated M35 HSS drills - http://sci-hub.tw/10.1007/s00170-011-3616-8
Performance of cryogenically treated HSS tools - http://sci-hub.tw/10.1016/j.wear.2006.01.017
Effects of Cryogenic Treatment on the Strength
Properties - http://sci-hub.tw/10.1088/1757-899X/229/1/012014
LN2 generator video: https://www.youtube.com/watch?v=7PWESWqhD8s
Heat treatment of steel video: https://www.youtube.com/watch?v=ulfCxDsVTWo
Source of drill bits: https://www.mcmaster.com/catalog/125/2508
Temperature logger (discontinued, unfortunately): https://www.adafruit.com/product/3081
3M fine polishing pads: https://www.amazon.com/Tri-M-Ite-Polishing-Abrasive-Assorted-Sheets/dp/B07CP9CCH4/
Delorean patent on cryogenic torsion bar: https://patents.google.com/patent/US4378658
Steel grain structure inspection, and overall great channel for material analysis: https://www.youtube.com/watch?v=UuHofNW40Yw
Steel grain structure video: https://www.youtube.com/watch?v=0SIr2sBHxA4
Applied Science on Patreon: https://www.patreon.com/AppliedScience
Monday, August 5, 2019
Ordinary printer paper is darkened by a high power UV laser, and then the affected area disappears in four minutes! This is caused by fluorescent brightening agents that are added to printer paper, which are temporarily overloaded by the intense UV light. It seems that oxygen plays a role in this, as hydrogen peroxide applied to the marks cause them to disappear instantly, and prevent them from being formed again by the laser. Performing the experiment in argon appears to slow the disappearing ink effect.
Wednesday, July 3, 2019
Testing myths about gas inside tennis balls.
Note: I should have added that all of the gases tested would have the same bounce height in a perfect no-loss system. The reason that SF6 bounces higher is because it heats less during compression, lowering the amount of possible thermal loss. Argon heats more during compression, and can lose more energy because of thermal transfer from the gas into the cylinder walls, where it is not restored upon decompression. Things are more complex in a tennis ball, though: Most of the losses are in the rubber shell, and not in the thermal dissipation of the fill gas. It's hard to estimate, but I'd say that the highest fill pressure, with a high-gamma gas would prove to be the most bouncy since it would cause the rubber shell to deform the least. The amount of compression in a tennis ball is very low, and any effect due to the gamma of the gas will be extremely small. Fill pressure will have a dramatically bigger effect.
Google drive link : https://drive.google.com/open?id=10gktbl7YQve5IKNAak1L0wIS_g_4BVEW
Nike Air: https://news.nike.com/news/nike-air-max-sustainability
EPA SF6 use: https://www.epa.gov/sites/production/files/2016-02/documents/conf00_smythe_paper.pdf
100 kg load cell: https://www.amazon.com/gp/product/B077YHNNCP/
Instrumentation amplifier: https://www.ebay.com/itm/INA114-Instrumentation-Amplifier-Module-1000-Times-Gain-Adjustable-Single-Supply/272973857983
SF6 on eBay: https://www.ebay.com/itm/Sulfur-Hexafluoride-SF6-18-lb-Tank-New-full-cylinder-Insulating-Gas-SALE/283464688564
Tennis ball patent: https://patents.google.com/patent/US4358111
SF6 data sheet: https://npeinc.com/manuals/General%20Electric/GEBK-IBvendor/ALLIED%20CHEMICAL.PDF
SF6 worldwide usage: https://www.ipcc-nggip.iges.or.jp/public/gp/bgp/3_5_SF6_Electrical_Equipment_Other_Uses.pdf
General adiabatic resources:
Saturday, June 15, 2019
Laboratory synthesis and systematic testing of a corrosion inhibitor commonly found in engine oils. This inhibitor is the reaction product of 2,5-dimercapto-1,3,4-thiadiazole and oleic acid.
Source of recipe: https://patents.google.com/patent/US4193882
Water fogger: https://www.amazon.com/gp/product/B00TN5EUUE/
Source of DMTD: https://www.amazon.com/TCI-America-Bismuthiol-B0593-25G-95-0/dp/B0727V9DQY/
Oleic Acid: https://www.amazon.com/gp/product/B01BLUTRO2