I would try a ceramic spong--maybe a Cerium oxide-- then use a solgel Ni compound and sinter at a temp higher than whar you want to operate the reactor.
The heavy metal ceramic may help damp the thermal degradation of the Ni structure. Bob Cook Sent from my Verizon Wireless 4G LTE [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
