This kind of surfacepassivation makes aluminum powder remain stable at a very high temperature.While the small size effect of nano-aluminum powder led to its performancechanged. Nano-aluminumpowder shows many good properties, due to its advantages of small particlesize, large specific surface area, high reactivity and so on. Studies foundthat the capacity of nano-aluminum powder combined with oxygen is stronger thanordinary aluminium powder. Nano-aluminum powder startoxidizing at 550, whileordinary aluminium was began to have clear oxidation phenomena at 950.Results showed that compared with conventional aluminium powders, self lubricating bushing
nano-aluminumpowder with lower ignition energy, can be directly ignited, combustion processwithout apparent cohesion, and full combustion.
Compared with the ordinaryaluminum powder, nano-aluminum powder has the characteristics of burning fasterand heating larger and so on. The particle size, surface area, shape and otherphysical properties of nano-aluminum powder are determined by its preparationmethod. Different methods will have an impact on the performance ofnano-aluminum powder. The application of nano-aluminum powder Efficientcatalysts: Added aluminum nano-powders to the solid fuel rocket propellant cangreatly improve the fuels combustion speed, combustion heat, improved thestability of combustion. Metallic andnon-metallic conductive coatings processing: Due to the Nano aluminum, copper,nickel has a high activation surface, in anaerobic conditions can beimplemented coating below the powder melting point temperature. This techniquecan be applied to the production of microelectronic devices. Activatedsintering additives: Due to the surface area and surface atoms of nano-metal powder are accounted for largepercentage, therefore, it has a higher energy state, in lower temperature willhave strong sintering capacity, is a kind of efficient sintering additives.Nitride aluminum powder at about 300will occur sintered behavior, will be produced an obvious sintering neck. Mixedwith 5~10% of nano-aluminum powder in nitride aluminum powder, can be improvedthe thermal conductivity ceramic sintering process, improve sintered densityand thermal conductivity.
If it used as the substrate of integrated components,thermal conductivity will be increased 10 times, can be solved the integratedcomponent of integration problem. Production method of nano-aluminum powder Put thealuminum into the crucible of hot metal evaporator, plasma transferred arc asheating source, melting the aluminum into liquid; the heating power of plasmatransfer arc is 50~150KW; Begin to continuous feeding in the crucible of heatmetal evaporator, feeding rate controlled at 0.3~5.0kg/h; the distilled aluminum vapor cooling bycooling gas and transported to particles controllers, aluminum vapor wascontinue cooling in particles controller, turned into solid state, form ofnano-aluminum powder, particle size between 10~1000nm; nano-aluminum powderunder the carrying of gas, after pass through the gas-solid separator, coolingto below 100, sediments to gas-solid separatorcollected in nano-aluminum powder collector, get the nano-aluminum powder, andthe gas after cooled was recycle used or emptying. Nano-aluminumpowder is a new metal incendiary agent of energetic materials, has receivedsignificant attention in recent years because of its characteristics whichcommon aluminum powder does not have. Nano-aluminum powder can significantlyincrease the propellant burn rate, specific impulse, reduce its characteristicsignal. Whereas the loss activity nano-aluminum powder has opposite effect inenergetic materials, so that systematic studies the activity of nano-aluminum powderand its active mechanism is particularly important and urgent.