Method for preparing protective coating suitable for blade with high Mo content and complex inner cavity structure
A technology for protective coatings and blades, applied in coatings, metal material coating processes, solid-state diffusion coatings, etc., to achieve the effects of easy implementation, avoiding external diffusion, and simple operation
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[0039] The present invention will be further described below in conjunction with accompanying drawing.
[0040] The invention provides a method for preparing a protective coating suitable for a blade with a complex inner cavity structure with high Mo content, including fluoride ion cleaning in the inner cavity of the blade and preparation of a gas-phase aluminized silicon coating. The specific steps are as follows:
[0041] Step 1: Put the leaves to be treated in a muffle tank after degreasing and cleaning, put 15-20g of polytetrafluoroethylene particles in a material box, and place the material box at the bottom of the aluminizing furnace;
[0042] Step 2: Vacuum the muffle tank below 1Pa and fill it with hydrogen to clean it several times;
[0043]Step 3: Ensure that the hydrogen gas is continuously fed into the muffle tank, heat the muffle tank from room temperature to 950-1000°C and keep it warm for 90min, with a heating rate of 10°C / min. During this period, the gas in th...
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