Cobalt-base alloys

High-temperature cobalt alloy is a special alloy, which has cobalt as the main component and contains a considerable amount of nickel, chromium, tungsten and a small amount of molybdenum, niobium, tantalum, titanium, lanthanum and other alloying elements. This alloy occasionally contains iron. Depending on the composition of the alloy, it can be made into wires, powders for hardfacing, thermal spraying, spray welding and other processes, and It can also be made into castings and forgings and powder metallurgy parts. High-temperature cobalt alloys show a certain high-temperature strength, good resistance to thermal corrosion and oxidation under the condition of 730～1100℃, so they are especially suitable for making aviation jet engines and industrial gas turbines, Therefore, it is especially suitable for the production of guide vanes and nozzle guide vanes of aviation jet engines, industrial gas turbines, naval gas turbines and diesel engine nozzles.

Cobalt-based high-temperature alloys are austenitic high-temperature alloys containing 40-65% cobalt, and these alloys have a certain degree of strength and resistance to oxidative corrosion at high temperatures. Cobalt-based deformed high-temperature alloys, on the other hand, are casting alloys containing 40~70% cobalt for use above 600°C. Their compositional characteristics include the addition of 10~30% Ni to stabilize the face-centered cubic matrix, and the addition of about 20% chromium to obtain satisfactory Oxidation and thermal corrosion resistance, and a higher content of carbon and tungsten, so that the alloy has both solid solution strengthening and carbide strengthening of the two main strengthening mechanisms