Preparation And The Research Of Metal And Alloy Nanoparticles By Flow-levitation Method

Nanomaterial is the one of new material that now most gets solicitude, its important meaning is more and more known for people to share. Research and the preparation of nanomaterial are the foundation of nano-ST. As nanotechnology is continuously developed has put forward higher requirement for the preparation of nanopowder: Need to prepare the various, shape look and structure that specifies size and equality the adjustable nanometer pellet to support application and development. Between metal, alloy nanopowder as well as nanocrystalline intermetallic compound has extremely extensive application prospect in a lot of high-tech fields. The demand of nanosize particle will increase increasingly with technology to develop. This paper with the actual needs of metal physical doping of ICF target material and laser -X-ray conversion material is starting point, major for flow-levitation method principle, technology parameter control particle grain size, structure and thermal stability of phase composition that preparation metal and alloy nanoparticle go deep into research.The principle of preparation metal nanoparticle by flow-levitation method is difference with other evaporate condensation method. As well-known, there is an induced current on the surface when metal material is in the high frequency electromagnetic field, since tending to skin heating effect to make the temperature of metal material surface go up promptly, surface beginning melt when temperature reaches the melting point of metal, metal material is heated up continuously bysurface to core till the metal droplet of melting. In the electromagnetic field that countercurrent inductor produces, the metal droplet that melts gets the role suspension of electromagnetism force in quartz pipe center and had been heated up continuously. When metal droplet of melting have been heated up certain temperature surface beginning gasification, metal vapor tension will raise follow temperature go up, is heated continuously can have plenty of metal atoms overflow metal ball liquid surface, at the same time, as the inert gas of cooling medium, all along with certain current velocity, sideswipe the metal droplet surface that melts. Metal atoms fly out liquid surface according to certain way form the atom cluster by the condensing of inert air current, merger and the collision between crystal nucleus pellet and atom cluster form the smoke flame of nanoparticle pellet eventually. The metal nanoparticles that form in hot critical layer are drawn from reaction area and arrives designated installation via the centrifugal selection grades ware under the transport of inertia gas current, then metal nanoparticles are collect via filter completion. Since adopting, it is unique to heat up way without wall contact, the production pellet purity gotten is very high, suits use very much to ask higher application field.Basis is the principle of fiow-levitation method and combination the needs of actual work, have led into instant infrared measure temperature system make evaporate temperature show and control more visual, have expanded the scope of speed adjustment for material supply installation to make consumed power be with production efficiency combine, besides, has still increased the installation of stabilized press of water-cooling system makes the operation of equipment more safe with stabilize. Through above improvement with perfect on antetype equipment foundation have made NMP-I type metal nanometer particle preparation installation, so to have established material foundation for prepare metal and alloy nanometer particle.In theoretically flow-levitation method can prepare the nanoparticle of a series of different metal element and different size. Through a course imitate for preparation of nanometal powders in inert gas by flow-levitation method, haveestablished the mathematics model of the metal droplet surface evaporate to form suspension nanoparticles in inert gas, the calculation of this model shows as a result, the major factor of affect nanometer...