A kind of molybdenum alloy containing anti-oxidation composite coating and preparation method thereof
A composite coating, molybdenum alloy technology, applied in the coating, metal material coating process, solid-state diffusion coating and other directions, can solve the problems of large difference in thermal expansion coefficient, easy cracks at joints, poor oxidation resistance at medium temperature and so on , to achieve the effect of narrowing the difference in thermal expansion coefficient, good bonding, and favorable anti-scour ability.
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Embodiment 1
[0031] Step 1: Prepare Mo-based alloys
[0032] According to the ratio of 85at%Mo, 15at%Cr for batching, using a planetary ball mill for wet grinding, ball ratio 5:1, speed 120r / min, ball milling time 30h, after the ball mill is completed, the powder is placed in a vacuum drying box for drying. The dried powder is then pressed into a cold isostatic mold. The pressed specimen was sintered at a low pressure at 1600 °C and 0.6Mpa, and the holding time was 3h, and the Mo-15Cr matrix alloy was prepared.
[0033] Step Two: Prepare (Mo, X)Si on the surface of the resulting alloy in step one 2-(Cr,X)Si 2 Base composite coating
[0034] The surface of the alloy is polished and polished step by step with 240#, 400#, 600# and 1000# silica carbide sandpaper, and blown dry after ultrasonic cleaning in absolute ethanol. The treated specimen is placed in an alumina crucible, placed in a tubular furnace, and NH is introduced into the furnace tube 3 The flow rate is 200ml / min, the surface nitridin...
Embodiment 2
[0036] Step 1: Prepare Mo-based alloys
[0037] According to the proportion of 75at%Mo, 25at%Cr for batching, using a planetary ball mill for wet grinding, ball ratio 5:1, speed 120r / min, ball milling time 30h, after the ball mill is completed, the powder is placed in a vacuum drying box for drying. The dried powder is then pressed into a cold isostatic mold. The pressed specimen was sintered at a low pressure at 1600 °C and 0.6Mpa, and the incubation time was 3h, and the Mo-25Cr matrix alloy was prepared.
[0038] Step Two: Prepare (Mo, X)Si on the surface of the resulting alloy in step one 2 -(Cr,X)Si 2 Base composite coating
[0039]The surface of the alloy is polished and polished step by step with 240#, 400#, 600# and 1000# silica carbide sandpaper, and blown dry after ultrasonic cleaning in absolute ethanol. The treated specimen is placed in an alumina crucible, placed in a tubular furnace, and NH is introduced into the furnace tube 3 The flow rate is 200ml / min, the surface ...
Embodiment 3
[0041] Step 1: Prepare Mo-based alloys
[0042] According to the ratio of 30at%Cr, 10at%Al, 5at%W, the margin is Mo for batching, using a planetary ball mill for wet grinding, ball ratio 5:1, speed 120r / min, ball milling time 30h, after the ball mill is completed, the powder is placed in a vacuum drying box for drying. The dried powder is then pressed into a cold isostatic mold. The pressed specimen was sintered at low pressure at 1600 °C and 0.6Mpa, and the incubation time was 3h, and the Mo-30Cr-10Al-5W matrix alloy was prepared.
[0043] Step Two: Prepare (Mo, X)Si on the surface of the resulting alloy in step one 2 -(Cr,X)Si 2 Base composite coating
[0044]The surface of the molybdenum matrix alloy is gradually sanded and polished with 240#, 400#, 600# and 1000# silicon carbide sandpaper, and blown dry after ultrasonic cleaning in absolute ethanol. The treated specimen is placed in an alumina crucible, placed in a tubular furnace, and NH is introduced into the furnace tube 3 ...
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