Axil, This study concludes that tungsten sintering starts at 800-900C http://scholarworks.boisestate.edu/td/239/
In particular, check out this statement "Densification of tungsten and tungsten with 10 weight percent ceria begins between 800 and 900 ºC and densities greater than 90% can be achieved at temperatures as low as 1500 ºC." I don't know about you but they have confirmed the start of "Densification" (read: sintering and atom migration), at 800-900C. These are for micron-sized tungsten powders. No, my firend, not even Tungsten will make a suitable metal lattice NAE if Rossi's cats are indeed operating at 1200C. Also, I don't believe the leaked pictures. It is quite convenient for Fioravanti to be involved in the leak. I think Rossi was the one who authorized the release of that Leaked photo to misdirect. I don't think that leaked photo has anything to do with his real cats. Using gas for heating is also questionable. I think Rossi is feeling the heat from other replicators that he needs to quickly misdirect with this leaked photo and gas nonsense. Even this 1200C operating temp might be a misdirection, cause this is beginning to look more and more impossible considering the thermal properties of many metals. A stainless steel reactor at 1200C would not be able to hold much pressure, let alone hydrogen at these temps and high pressures. Hydrogen embrittlement attack rates at these temps accelerate rapidly. Whatever thermionic catalyst he had in his original cats would be useless at 1200C, that's for sure. So, his process must be radically different now. Once again, if you accept that Rossi is operating at 1200C, then you have to accept the logical conclusion stemming from that statement, that is, that he is using Carbon nanostructures. Jojo ----- Original Message ----- From: Axil Axil To: [email protected] Sent: Friday, August 31, 2012 7:18 AM Subject: Re: [Vo]:ECAT Simulations With Third Order Temperature Dependency I hear what you are saying JoJo, but Rossi says he will use natural gas only for external power in his 1200C reactor. This means that the reactor is still thermionic in nature (No nanotubes). He could be using tungsten carbide as the micro powder(4 microns) to avoid sintering. Cheer: Axil On Thu, Aug 30, 2012 at 6:53 PM, Jojo Jaro <[email protected]> wrote: In-situ HRTEM obeservations of CNT tip growth in a small gas-reaction CVD cell of nickel nanoparticle catalyst reveal that the nickel nanoparticle was changing shape indicating that they were in liquid form at a temperature of 600C. I suspect iron nanoparticles would also be in liquid state very near this temperature; and forget about copper, it would be melted at much lower temps. That is why I am still of the opinion that Rossi's 1000C or 1200C ecats, if real, must be Carbon nanostructure based. No metal nanoparticle NAE, cavity, voids, and vacancies will survive 1000C, let alone 1200C without signiificant deformations of the nanocavities that house your NAE. Even refractory metals like tungsten in nanopowder form would probably start sintering and migrating at these levels. Can anyone think of a metal in nanopowder form that will not start to sinter at 1200C? Only carbon nanostructures will survive these temps. Hence, when you eliminate the impossible, whatever remains however improbable must be the truth. Rossi's cats MUST be carbon nanostructure-based. And once more, time will prove me right about this. Jojo ----- Original Message ----- From: ChemE Stewart To: [email protected] Sent: Friday, August 31, 2012 3:49 AM Subject: Re: [Vo]:ECAT Simulations With Third Order Temperature Dependency Nanopowder typically melts at lower temperatures than its equivalent solid. On Thu, Aug 30, 2012 at 3:46 PM, Jed Rothwell <[email protected]> wrote: Axil Axil <[email protected]> wrote: Does the maximum level of external temperature spike ever get above 1450C at any point? Ah. Google tells me that is the melting point of Ni . . . Actually, you cannot get close to a melting point without bad stuff happening. Sintering and local melting. The temperature is not likely to be uniform. - Jed
