Method for preparing molybdenum silicide coating on surface of molybdenum or molybdenum alloy
A technology of molybdenum alloy and molybdenum silicide, which is applied in the field of high-temperature protective coatings, can solve the problems of further improvement and large difference in thermal expansion coefficients, and achieve good high-temperature oxidation resistance, reduce thermal expansion coefficient mismatch, and high efficiency.
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[0030] Preparation of silicon coating. Specifically, silicon powder with a certain particle size distribution and purity is selected, and a silicon coating with a certain thickness is prepared on the surface of molybdenum or molybdenum alloy by plasma spraying technology. Among them, the particle size of the selected silicon powder is 10-120 μm, and the purity is greater than 98 wt.%. Dry the silicon powder at 100-120°C for 1 to 3 hours for later use. The silicon powder is sprayed onto the surface of molybdenum or molybdenum alloy by plasma spraying technology to form a silicon coating, and the thickness of the silicon coating is 30-300 μm. The process parameters of plasma sprayed silicon coating include: plasma gas Ar: 30-50 slpm (standard liters / minute); plasma gas H 2 : 6~15slpm; powder carrier gas Ar: 2~7slpm; spraying distance: 100~200mm; spraying power: 30~50kW; powder feeding rate: 10~30rpm (revolutions per minute). By controlling the process parameters of the plasma s...
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[0038] Example 1
[0039] A molybdenum silicide coating on the surface of molybdenum metal. The preparation of the coating includes the following steps:
[0040] 1) Sandblasting the surface of the Mo metal substrate with a sandblasting pressure of 0.4MPa, sonicating 2 times in anhydrous ethanol solution for 5 minutes each time, drying at 100°C for 2 hours, standby;
[0041] 2) Choose silicon powder with a median particle size of about 30μm and a purity of greater than 98wt.% as the spraying raw material, and dry it at 100°C for 3 hours, for use;
[0042] 3) Using a plasma spraying system (A-2000, Sulzer Metco AG, Switzerland), using the process parameters in Table 2 to spray silicon powder on the surface of the Mo substrate to form a silicon coating, the thickness of the silicon coating is about 110μm, figure 1 The XRD results show that the silicon coating is cubic phase;
[0043] Table 2 shows the process parameters of plasma sprayed Si coating:
[0044]
[0045] 4) A vacuum-atmosphere ...
Example Embodiment
[0060] Example 2
[0061] A molybdenum silicide coating on the surface of molybdenum metal. The preparation of the coating includes the following steps:
[0062] 1) Sandblasting the surface of the Mo metal substrate with a sandblasting pressure of 0.4MPa, sonicating 2 times in anhydrous ethanol solution for 5 minutes each time, drying at 100°C for 2 hours, standby;
[0063] 2) Choose silicon powder with a median particle size of about 30μm and a purity of greater than 98wt.% as the spraying raw material, and dry it at 100°C for 3 hours, for use;
[0064] 3) Using plasma spraying technology, select the process parameters in Table 4, spray silicon powder on the surface of the Mo substrate to form a silicon coating, the thickness of the silicon coating is about 60μm, and the silicon coating is cubic phase;
[0065] Table 4 shows the process parameters of plasma sprayed Si coating:
[0066]
[0067]
[0068] 4) A vacuum-atmosphere sintering furnace protected by argon gas is used to make a di...
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