On Nov 21, 2009, at 4:40 AM, Gene Heskett wrote: >>> s/infinity/affinity :) >> >> Doh! So much for trying to sound intelligent! > > Or ENOTENOUGHCAFFIENE, it is quite early here and the pot hasn't > been started > yet. Its purely accidental that I caught that this time of the > morning. > Diabetic, up to pee, and I don't care how old you are, its an > unwritten rule > that if you want to keep your geek credentials you have to check > your email > before going back to bed. ;-)
Ahahahaah! >> :P >> : >>>> Note that titanium dioxide takes a great deal more energy to >>>> sustain >>>> an exothermic reaction compared to iron oxide, so the use of a >>>> catalyst is required. >>> >>> Interesting Jeshua, and the catalyst used was? >> >> Thanks Gene! >> >> I have used both potassium perchlorate (KClO4) and calcium sulphate >> (eg drywall, plaster of paris or gypsum). Drywall is much more >> readily >> available and safer to handle (KClO4 is a carcinogen). > > So is some chinese drywall ;) You're funny Gene! >> It is a really interesting reaction - it is like Thermite in slow >> motion. Here is what the alumina (slag) looked like about 20 minutes >> after starting the titanium reaction: >> >> <http://openosx.com/hotspring/my-magma.jpg> > > And it took 20 minutes to reach that state? Wow! Exactly! > And I assume the titanium > was suitably 'cast' once the reaction was used up & things cooled. Yes, that was actually the end of the reaction so it had slowed down quite a bit (but it was still going) than the actual burning stage. When a titanium reaction is going, you get white sparks flying - a lot like sparklers. Note that you also add fluorite to make the titanium flow better. Here are percents to use by weight: Titanium dioxide 30.0% Drywall 25.5% Aluminium powder 27.0% Ground fluorite 17.5% > What does > one use for a casting mold/crucible material at those sorts of temps? Graphite and water cooled copper molds work great. Copper molds are pretty easy to cast using lost foam or machined. Graphite is easy to machine (messy though!). My first attempt was in olivine sand, and I had about 1/2 inch layer of black quartz fused around the casting! Best, Jeshua Lacock Founder/Programmer 3DTOPO Incorporated <http://3DTOPO.com> Phone: 208.462.4171 ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
