Ultrafine particle material is a powder of particle size in 1 to 100 nm, it is also known as nanoparticles. The nanoparticles have the effect of small size, large specific surface and macroscopic quantum tunneling effect. Thus it shows good performance that micron powder does not have. Because copper nanoparticles have large specific surface and big number of surface active centers, they become excellent catalysts in metallurgical and petrochemical.
In automobile exhaust purification process, the nano-copper powder can be used in part as a catalyst instead of the precious metals platinum and ruthenium, toxic carbon monoxide into carbon dioxide, nitric oxide into nitrogen dioxide. With the development of the electronics manganese powder industry, prepared by the nano-copper powder superfine thick film pastes used in the LSI plays an important role, while the price than the precious metals silver, palladium powder, inexpensive, and has broad application prospects.
Hydrogenation and dehydrogenation reactions of polymers, nano-copper powder catalyst has high activity and selectivity in the acetylene polymerization is used in the production of conductive fibers, nano-copper powder is very effective catalyst. Ultrafine Copper is an indispensable basic raw material of good conductivity, high strength of nano-copper. Because of its excellent electrical properties, are widely used in the conductive adhesive, conductive coatings and electrode materials, the study found that in recent years can be used for the production of catalysts, lubricant additives, and can even be used for treatment of osteoporosis and fractures.
The development of nano-copper powder is a potential copper and its alloys revolutionary change has important theoretical significance and practical value. Copper nanoparticles in the development stage and its extensive use of copper nanoparticles have better market value and market outlook. The reducing agent used include formaldehyde, ascorbic acid, sodium hypophosphite, boron, sodium chloride, hydrazine hydrate, but these reductant some highly toxic, and some reproduction is poor, some costs are too high, as well as the reaction process easy to introduce other impurities, therefore, to find a more appropriate reducing agent or compound reducing agent, and study more ideal reaction system to become an important research topic of the nano-copper powder preparation. In addition, due to the smaller particle size of bronze powder (FCu 663) nanoparticles, the surfactant large, easy to reunite, and the powder surface is easily oxidized to Cu20, how to improve the dispersion of copper nanoparticles and how to prevent the copper powder is oxidized is also an important research direction.
Currently, the industrial production of ultra-fine Materials and methods: freeze drying, precipitation transformation method, phase synthesis method, ultrasonic method, the hydrolysis method, mechanical alloying technique, homogeneous precipitation method, restore a protective law. The above method and some require large equipment and some complex, some preparation costs are high, and some qualified rate and low yield. And liquid phase chemical reduction method of copper nanoparticles has its unique advantages, such as simple equipment, arts short process, a small investment, production, low cost, easy to industrial production.
Nanometer copper lubricant additives are a new type of lubricant additive products basing on nanotribology and nanotechnology as theoretical guidance. It has excellent antifriction and energy saving efficacy. Adding nanometer copper lubricant additive to automotive engine lubricants, the engine start-up current can be reduced and it increased cylinder pressure. Engine using the additive for some time, they form a protective film on the cylinder liner and piston ring. Once the lubrication system failure, the car is also safe driving for a long time, this is of great significance in the military. In addition, the nano-copper powder can significantly improve bone density, increase fracture resistance and improve the morphology. There are significant preventive and therapeutic effects for osteoporosis.Source:http://www.mhcmp.com