Preparation method of refractory metal molybdenum protective film resisting liquid lead-bismuth corrosion
A liquid lead-bismuth alloy, refractory metal technology, applied in the direction of metal material coating process, can solve the problems of corrosion, affecting material properties, poor bonding force, etc., and achieve the effect of good stability and good bonding effect
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[0069] Example 1
[0070] Experimental preparation process of in-situ formation of protective film of refractory metal molybdenum in liquid lead-bismuth alloy:
[0071] The refractory metal molybdenum used in this embodiment is prepared by powder metallurgy, and its basic raw material is generally molybdenite (MoS 2 ). Roasting molybdenite can obtain molybdenum trioxide mixed with impurities, and then dissolve molybdenum trioxide in ammonia water to obtain ammonium paramolybdate (NH 4 ) 6 Mo 7 O 24 ) Solution and filter the slag. The ammonium paramolybdate is extracted from the solution and roasted at about 500°C to decompose to produce high-purity molybdenum trioxide. Molybdenum trioxide uses hydrogen to reduce molybdenum trioxide to obtain pure molybdenum powder, which is cold-pressed and sintered to obtain a rod with a diameter of 90 cm, and finally extruded into a rod with a diameter of 7 mm.
[0072] The specific chemical reaction equation of the prepared molybdenum powder is ...
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[0089] Example 2
[0090] 1) Prepared by powder metallurgy method Molybdenum bar material, and cut into two experimental samples of 3x6x50mm, after removing the surface oxide scale, stress relief annealing at 900℃ for 50min; after 240#, 400#, 800#, 1200#, 2000# water sandpaper grinding samples , Remove the scratches on the sample surface with a polishing cloth of woolen material and 2.5μm diamond polishing agent, and finally use alcohol to ultrasonically clean for 5 minutes and dry it;
[0091] The large block of lead-bismuth alloy will be cut into small pieces by a cutting machine, and 400g will be weighed to be used as a corrosive medium, ultrasonically cleaned with alcohol for half an hour and dried;
[0092] 2) Put the weighed lead-bismuth alloy into a 50ml high-purity alumina crucible, and place it in an atmosphere muffle furnace with a furnace temperature of 590℃ for 20 minutes to completely melt the lead-bismuth alloy;
[0093] 3) Insert the sample into the crucible containing...
Example Embodiment
[0095] Example 3
[0096] 1) Prepared by powder metallurgy method Molybdenum bar material, and cut into two experimental samples of 3x6x50mm, remove the surface oxide scale, stress relief annealing at 850℃ for 60min; after 240#, 400#, 800#, 1200#, 2000# water sandpaper grinding samples , Remove the scratches on the sample surface with a polishing cloth of woolen material and 2.5μm diamond polishing agent, and finally use alcohol to ultrasonically clean for 5 minutes and dry it;
[0097] The large block of lead-bismuth alloy will be cut into small pieces by a cutting machine, and 400g will be weighed to be used as a corrosive medium, ultrasonically cleaned with alcohol for half an hour and dried;
[0098] 2) Put the weighed lead-bismuth alloy into a 50ml high-purity alumina crucible, and place it in an atmosphere muffle furnace with a furnace temperature of 600°C for 20 minutes to completely melt the lead-bismuth alloy;
[0099] 3) Insert the sample into the crucible containing the li...
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