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Properties and application characteristics of Mo and Mo alloys

  • Mosten
  • 26 Jul

Molybdenum is a kind of refractory metal, the melting point is 2630 ℃, the recrystallizing temperature is about 900 ℃, the strength is high at high temperature, and the processing performance is good. It is not only a heat-resistant coating material, but also the only metal material of heat-resistant hydrochloric acid. The friction coefficient of Molybdenum is low and the wear resistance is good. When spraying Molybdenum, the molten Molybdenum on the surface can dissolve into the metal matrix, and even form metallurgical bonding on the surface of the cutting smooth workpiece. The thickness of the bonding layer is about 1 μ m, so it is often used as the underlayer material. Molybdenum can form a good combination with many metals such as carbon steel, stainless steel, cast iron, aluminum and its alloy, so Molybdenum coating is often used as the bottom layer of machine tool bed guideway coating. In addition, some MoS2 impurities remain in the Molybdenum coating, or react with sulfur to form MoS2 solid lubrication film, so the Molybdenum coating can be used as a wear resistant coating, such as piston ring, brake pad, aluminum alloy cylinder and other friction surface spray coating. The spraying of Molybdenum is mostly sprayed with flame wire, which is due to the low cost of the process, simple operation and easy automation. Plasma sprayed Molybdenum powder has the advantages of dense spraying coating and low oxide content, and Molybdenum powder can be mixed with other powder materials, which creates favorable conditions for plasma spraying Molybdenum powder. The main disadvantage of Molybdenum is easy oxidation, the melting point of oxide (MoO3) is low and volatile, so it will be consumed by sharp oxidation when it is higher than the melting point.

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Molybdenum