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Effect of cobalt powder by Ma tracy
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Effect of cobalt powder |
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Cobalt and nickel, chromium, molybdenum, tungsten alloy under high temperature have high intensity, good heat resistance, used for Jet aircraft and gas turbine. Cobalt-60 is a widely used radioactive source, used for radiation breeding and control pests, food irradiation preservation, thickness determination as well as radiation therapy and so on. Cobalt as an important strategic metal, due to its excellent physical, chemical and mechanical properties, it is an important raw material of producing high temperature resistance, corrosion resistance, high strength and strong magnetic material, therefore, it has wide range of applications on a global scale. Pure cobalt is used rarely, but cobalt is the main adding element of alloy and special steel. For example, the solid magnetic material is the rare earth elements (mainly the samarium and erbium) combined with cobalt, is a permanent magnet with strong magnetic field. Similarly, refractory alloys, super hard corrosion resistance alloy are also joined in cobalt powder. In many cases, the cobalt is usually used in electroplating, because the weak acid resistance of cobalt plating compared with chromium, nickel plating are much more stable. Cobalt base alloys are the ageneraldesignation of one or more of the cobalt, tungsten, iron, nickel and chromium made alloys. The tool steels containing a certain amount of cobalt can significantly improve the wear resistance of steels and the cutting performance. Containing 50% cobalt cemented carbide even if heated to 1000 degrees centigrade above would never loses its original hardness, now this cemented carbide has become the most important material for gold-bearing cutting tools and aluminum. In this material, cobalt combined with other metals carbide grain in the alloy, make alloys with higher toughness, and reduced the sensitivity to impact performance, this alloy weld on the part surface can increase the component life by 3-7 times. The most widely used alloys in aerospace technology is NI-base alloy, can also use cobalt base alloys, but these two alloys with different "strength mechanism". Containing titanium and aluminum nickel base alloy with high strength was because of formed of NiAl (Ti) enhancer, when the temperature is high, fortified grain changed over to solid solutions, then the alloy quickly lose strength. Heat resistance of cobalt base alloys are because of forming refractory carbides, these carbides are not easily converted to solid melt, proliferation activities are small, in above 1038?, the advantages of cobalt base alloy appear to be exhaustive. This is good for manufacturing high efficiency heat engine, cobalt base alloy. Use 20%-27% chromium-cobalt-base alloy in aviation turbine structural materials can make the materials have high oxidation resistance without protect coatings. According to metal powder supplier, United States test used generator boilers are made of cobalt alloys. Cobalt is one of the few metals that magnetic one time can remain magnetic. Under the action of heat, loss of magnetic temperature called Curie point, the Curie point of iron is 769?, nickel is 358?, cobalt up to 1150?. Magnetic steel containing 60%cobalt compared with magnetic steel, the coercive magnetic force was increasing 2.5 times. Under the vibration, general magnetic steel lost almost one-third magnetic, and the cobalt steel only lose 2%~3.5% magnetic. So that the cobalt advantages in magnetic material are obvious. Cobalt oxide is mainly used in the production of cemented carbide and ceramic enamel pigments glazes and so on; cobalt sulfate is mainly used for ceramics, pigments and glazes, paint driers and electroplating industries. Cobalt chloride is mainly used in manufacturing barometers, hydrometers and for the ceramic industry. Naphthoic acid cobalt is mainly used for paints and inks driers, rubber, colorants, viscosity-increasing agent and FRP industry. Cobalt octoate is mainly used for paint, fiberglass and rubber radial tire and so on. Source:http://www.mhcmp.com
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