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Application prospect of nickel-cobalt alloy powder

2019-05-08

Application prospect of nickel-cobalt alloy powder

 

With the rapid development of science and technology, people have put forward different requirements for materials. Ultrafine particles have obvious small size effect and surface effect, which has long aroused the interest of many researchers.Powder with small grain size, low agglomeration, large specific surface area and high chemical activity provides a broad prospect for the development of new materials.Superfine Ni - Co alloy powders with different from the elemental special properties of nickel and cobalt metal powder (physical, chemical and mechanical properties), and the surface of the special magnetic, in hard alloy, magnetic materials, catalyst, battery etc have broad application prospects, due to grain refinement, for example, in magnetic memory cobalt, magnetic card and other electronic products has been widely used.

 

Carbide
 

Because of the price expensive cobalt metal, resources are scarce, people have been studying the substitute of cobalt, common is substitute for nickel and iron, iron powder as the binder of cemented carbide is usually very low mechanical strength, with pure nickel as cemented carbide binder phase, the physical and mechanical properties of the cemented carbide of cobalt is better than for the performance of the adhesive, and process control difficult.Therefore, dispersion strengthening bonding phase by alloying method has always been the basic starting point for the production of new generation cemented carbide.In order to overcome the disadvantage of pure nickel as bonding metal and to save cobalt metal, many countries have carried out research on replacing part of cobalt with part of nickel and achieved good results.The results of a study of P30 alloy by Swedish company sandvik show that the sensitivity of the cutter to the notch increases with the increase of the nickel content in the bonded metal.It was also found that after sintering for 1 hour at 1400 deg c, almost all the alloys could achieve * densification regardless of the content of nickel in the bonded metal. 

    

Alloy coatings
 

It is suitable for the electroplating of watches, bicycle parts, etc., as a semi-bright nickel-nickel or nickel-copper after the replacement of chromium coating, it has good welding, is very suitable for the use of electronic components and printed circuit board.Because the addition of cobalt, improve the luster of nickel coating, make it more full, and improve the hardness and strength of pure nickel layer, and low contact resistance, so it can not only as a protective decorative coating, but also can be used as a mechanical coating.Due to its high hardness can also be used for electroplating. 

 

Catalyst
 

Nitrous oxide is often discharged into the atmosphere as a by-product of circulating fluidized bed of internal combustion engine, automobile exhaust gas and fatty acid production.Nitrous oxide catalyzes the destruction of ozone in the atmosphere and the room temperature effect.Therefore, from the perspective of environmental protection, nitrous oxide should be decomposed before it is discharged into the atmosphere.Nickel and cobalt have a catalytic effect on the decomposition of nitrous oxide, and nickel-cobalt alloy powder has a more significant catalytic effect.

 

Hydrogen storage alloy electrode
 

Hydrogen storage alloy is an alloy material that can store hydrogen atoms in large quantities in the interstices of crystals.This alloy has the magic property of reversible hydrogen absorption and release.It can store hydrogen thousands of times the size of the alloy itself, and its hydrogen absorption density is higher than that of liquid hydrogen and solid hydrogen, which is both light and safe, showing unparalleled advantages.Hydrogen storage alloys with practical value must have the following basic properties: 1.2. Easy activation;3. Moderate dissociation pressure;4. Rapid reaction of hydrogen absorption and release at room temperature;5. Low cost and long service life. 

 

Magnetic materials
 

At present, magnetic recording technology has become an important part of new information technology. The main requirement for magnetic recording is to improve its recording density, recording capacity and miniaturization of recording equipment, which puts forward higher requirements for magnetic recording medium and magnetic recording head.Due to its critical anisotropy and low thermal conductivity, nickel-cobalt alloy becomes a very important magnetic material, especially in magnetostrictive sensor material.