You have too worry about Zr water reaction above 950 degrees F. Bob Cook
Sent from my Verizon Wireless 4G LTE SmartphoneBob Higgins <[email protected]> wrote: Robin, My understanding is that the temperature of the exchanger heating the water is at 300C. If this were the case in a LENR reactor, then the reaction core would probably have to be substantially hotter to overcome the thermal resistance and have that operating point. The concern is the temperature of the Ni. With good design, the Ni could be only 30-50C hotter than the water contact point in the heat exchanger. This means having a very close thermal contact of the Ni with the reactor vessel - the Ni must be like a thick film coating on the vessel wall. It is not clear what Rossi used as his nano-catalyst with the Ni in his hotCat - it may be nano-zirconium which has a much higher melting temperature. Rossi once said he had explored other catalysts and found them to work, but not with as high of a COP as the one he originally used. I suspect he went back to one of these other catalysts for the hotCat as part of getting it up to higher temperature. Then he added his "mouse" to improve the COP. I think the mouse was a first stage using his original recipe (likening Rossi to Colonel Sanders :) ). Bob Higgins On Mon, Oct 6, 2014 at 4:59 PM, <[email protected]> wrote: > In reply to Bob Higgins's message of Mon, 6 Oct 2014 16:13:39 -0600: > Hi, > > Even if 300C were the limit, would that really be a problem? IIRC Jed has > mentioned that 300-350C is the usual working temperature of fission > reactors, so > it appears to be a usable temperature range. > Furthermore, Rossi's Hot-cat is already operating at temperatures well > above > 600C. > > >This is frequently done with noble metal catalysts. They are mixed with a > >thin oxide "wash coat" and applied either to a metal or a ceramic base. > >The Ni is tougher to keep from sintering. You want the nano-Ni exposed, > >but the nano-features melt at about 600C and will begin sintering at 300C. > > > >One of the ways that nano materials are fabricated is by successive > >oxidation and reduction. The oxidation causes the material to grow (think > >how a rusty nail grows as it oxidizes). Then when reduced you are left > >with an elemental metal skeleton having features smaller than you began > >with. My process uses this technique to expose nano features after > partial > >sintering by oxidation/reduction with a final step of reduction. I start > >with larger particles, add nano-Fe2O3, and then go through stages of > >thermal oxidation and reduction. > > > >Bob Higgins > [snip] > Regards, > > Robin van Spaandonk > > http://rvanspaa.freehostia.com/project.html > >
