1. The application of ultrafine copper powderon the inner electrode of MLCC copper has the advantages of low resistivity, low electromigration speed, and high price. it is one of the ideal substitutes for silver-palladium internal electrodes, but its chemical properties are more active. in the air, powdered copper with a large specific surface area is easily Oxidation, a thin film of Cu2O and CuO will be formed on the surface, causing its conductivity to drop rapidly and even become non-conductive. The internal electrode of the chip multilayer ceramic capacitor made of ultrafine copper powder prepared by the phase reduction method overcomes the above shortcomings and has the advantages of good dispersibility, high sphericity, uniform particle size, etc., and will definitely become an excellent choice for MLCC. 2. application of ultrafine copper powder in conductive coatingsconductive coating is a kind of functional coating that develops rapidly with the advancement of science and technology. at present, its main fillers are carbon-based, silver-based, copper-based, nickel-based, and composite systems. as a conductive filler in coatings for electromagnetic wave shielding, copper powder is favored because of its high conductivity, relatively cheap price, easy availability of materials, and the absence of silver powder in the coating that affects the performance of the coating due to the "silver migration". However, copper is easy to oxidize, and its oxide conductivity is low, resulting in a decrease in the conductivity of the coating. Therefore, the research and development of copper powder composite conductive coatings with low price and resistance to metal migration have attracted more and more attention. 3. application of ultrafine copper powder in lubricants The ultra-fine copper powder is dispersed in various lubricating oils in a suitable way to form a stable suspension, which can become a lubricant with excellent performance, which can greatly reduce the wear and friction of materials and equipment, especially under heavy load and low speed. The effect is more significant under high temperature and vibration conditions, and it plays an extremely important role in protecting materials and equipment. For example, copper sulfate pentahydrate is the main raw material to prepare nano-copper powder, which has stronger anti-wear and anti-friction properties than traditional lubricants, and has become an anti-wear and anti-friction additive for a new generation of lubricants. 4. application of ultrafine copper powder on catalyst The particles of ultrafine copper powder are fine and uniform, and the specific surface activity is large. people make use of this feature to make highly efficient catalysts. For example, in the purification process of automobile exhaust, ultrafine copper powder is used as a catalyst to partially replace the precious metals platinum and ruthenium, which converts toxic carbon monoxide into carbon dioxide and nitric oxide into nitrogen dioxide. Because of its high catalytic activity, ultrafine copper powder is also used as a catalyst in the reaction process of carbon dioxide and hydrogen to methanol. The nano-copper particles catalyzed the polymerization of acetylene and achieved satisfactory results. 5. The application of ultrafine copper powder in other areas Ultra-fine copper powder is used to prepare nano-copper materials, which can obtain copper materials with good ductility, good strength and plasticity, which is extremely beneficial to the processing of materials and the manufacture of micro-machines. in addition, because of the low melting point of copper, people often use ultra-fine copper powder in the aerospace field and make rocket nozzles. in medical treatment, ultra-fine copper powder also plays an important role in the treatment of osteoporosis, fractures and other diseases. it can be said that because of its basic characteristics such as small size effect, surface interface effect, quantum scale effect and quantum tunneling effect, ultra-fine copper powder has many excellent properties that are different from conventional materials of the same composition, and is widely used in mechanics. With the further development of science and technology in the fields of, electricity, chemistry, etc., it will definitely show more potential application prices and play a greater role in a broader field.
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