*These do not melt like nanoscale features.* What is the temperature at which these surface features are destroyed?
On Sat, Oct 18, 2014 at 8:50 PM, Bob Higgins <[email protected]> wrote: > See my previous reply to Eric. Bare Ni will sinter together into a low > porosity bulk at 500C. Coating the Ni particles with the Fe2O3 nanopowder > before they ever get hot prevents large scale sintering. The "tubercles" > that Rossi described during growth are micron-scale features. These are > not active themselves, just a marker of the thermochemical processing. I > have seen these myself. These do not melt like nanoscale features. > > On Sat, Oct 18, 2014 at 1:51 PM, Axil Axil <[email protected]> wrote: > >> Bob Higgins: "Even these 4-10 micron scale nickel particles will sinter >> into a porous mass by heating at 500-700C". >> >> Rossi uses micro particles in the 2 to 10 micron range. The nano >> structured surface tubercles coating will melt at lower temperatures that >> the sintering of the entire particle. This coat was seen to be intact in >> photos of these micro-particles from the TPT. >> >> On Sat, Oct 18, 2014 at 3:37 PM, Bob Cook <[email protected]> >> wrote: >> >>> Bob-- >>> >>> Thanks for that clarification about the melting of small Ni particles. >>> Are there any compounds or alloys of Ni that would not melt or sinter below >>> say 1100 C? Since Rossi says he does not use Ni nano particles the fuel >>> may be something else containing Ni that could be exposed to the Li at 1000 >>> C in some reliable configuration. >>> >>> For example the following abstract suggests some possible substrates >>> that would hold the Ni at temperature. >>> >>> Composite nano particles of Ni-TiC and Ni-TiN were prepared by an active >>> plasma-metal reaction method. The structure and morphology were evaluated >>> by X-ray diffraction and transmission electron microscopy observations. The >>> morphology of the composite particles is dice-like or dumbbell-like, where >>> the outer sides are metallic and the inner part of the rod (or dice)-like >>> structure is TiC or TiN. The formation mechanism of the composite particles >>> is considered by analogy to the VSL mechanism. *The thermal stability >>> of the nanocomposite particles is vastly superior to that of the metal >>> particle.* The excellent catalytic property of the Ni-TiN composite >>> particle was confirmed when compared to the well-known Raney Ni particle >>> and mixed particles of Ni and TiC. >>> >>> Note the increased thermal stability. >>> >>> Bob >>> >>> >>>
