The left side (in Figure 1) 45-50mm of the reactor are much cooler than the heated core between the insulated supports. This end near the thermocouple plug probably never exceeded 700C. Particles that ended up there did not undergo as much sintering. As I recall the Lugano test particle was nearly 500 microns across and probably was that size due to substantial sintering with smaller particles. Sintering of Ni would still occur in the colder part.
On Sat, Oct 18, 2014 at 11:59 AM, Axil Axil <[email protected]> wrote: > And yet, particle 1 which showed Ni62 transmutation also shower that the > tubercle nano-surface was still in place after days of 1400C operation. Any > ideas? > > On Sat, Oct 18, 2014 at 1:13 PM, Bob Higgins <[email protected]> > wrote: > >> As someone who has first hand experience working with micro-scale >> carbonyl Ni powder, and treating these powders in a thermochemical reactor, >> I can tell you that what you are saying about the nickel particles is 100% >> wrong. Even these 4-10 micron scale nickel particles will sinter into a >> porous mass by heating at 500-700C. Ni melts at 1455C and the nano-scale >> features will all melt at about half of this temperature - the nanoscale >> features will ball-up onto the micro-scale nickel particle to which the >> feature may be attached. Any nanopowder of Ni present is melted before >> 800C and becomes a larger particle - and then condenses. And Rossi >> specifically says he does not use nickel nanopowder anyway. The same is >> true for other free nanoparticles. By the time the IH reactor is operating >> above 1000C, there are no nickel nanoparticles or nano-features of any kind >> left - they are all melted into larger agglomerations. >> >> I don't know what your experience is with, but it is not with nickel >> powder. Alumina does not store hydrogen in any significant measure. >> >>
