Crack-arresting and anti-peeling bionic dam-structure gradient coating and preparation method thereof
A structural gradient and anti-stripping technology, which is applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of premature spalling of atmospheric plasma sprayed thermal barrier coating, so as to improve the anti-oxidation performance and improve the coating quality. Effect of layer density and hardness, retardation of crack propagation
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[0030] The preparation method of the anti-cracking anti-stripping bionic embankment structure gradient coating of the present invention comprises the following steps:
[0031] Step 1, cleaning and blasting the surface of the substrate 4 according to the conventional process;
[0032] Step 2. Prepare a thermal sprayed thermal barrier coating on the surface of the substrate. The thermal barrier coating includes a surface ceramic layer 1 and a metal bonding layer 3. When preparing the thermal barrier coating, first prepare a metal bonding layer on the surface of the substrate 4. layer 3, and then prepare a surface ceramic layer 1 on the metal bonding layer 3;
[0033] Step 3, preheating the thermal barrier coating;
[0034] Step 4. Using laser technology, prepare ring-shaped dam structures 2 on the surface ceramic layer. The three ring-shaped dam structures are concentric and have a depth of 100 μm to 350 μm. The width of the three ring-shaped dam structures is 1 mm to 3 mm. Adj...
Embodiment 1
[0041] The substrate 4 used in this embodiment is a K417G superalloy substrate.
[0042] First, the surface of the K417G superalloy substrate is cleaned and sandblasted according to the conventional process. Then prepare thermal sprayed state thermal barrier coating on the substrate surface, this thermal barrier coating comprises surface ceramic layer 1 and metal bonding layer 3, such as figure 1 and figure 2 shown. When preparing the thermal barrier coating, a NiCrAlY metal bonding layer 3 with a thickness of about 50 μm is prepared on the surface of the substrate 4 by low-temperature supersonic flame spraying, and then a NiCrAlY metal bonding layer 3 with a thickness of about 200 μm is prepared on the metal bonding layer 3 by atmospheric plasma spraying. 7wt.% Y2O3 partially stabilized ZrO2 (7YSZ) surface ceramic layer 1. image 3 It is the cross-sectional structure of the sprayed thermal barrier coating. It can be seen that there are pores, cracks and other defects dist...
Embodiment 2
[0044] The substrate 4 used in this embodiment is a K417G superalloy substrate.
[0045] First, the surface of the K417G superalloy substrate is cleaned and sandblasted according to the conventional process. Then a thermal sprayed thermal barrier coating is prepared on the surface of the substrate, the thermal barrier coating includes a surface ceramic layer 1 and a metal bonding layer 3 . When preparing the thermal barrier coating, a NiCrAlY metal bonding layer 3 with a thickness of about 100 μm is prepared on the surface of the substrate 4 by low-temperature supersonic flame spraying, and then a NiCrAlY metal bonding layer 3 with a thickness of about 250 μm is prepared on the metal bonding layer 3 by atmospheric plasma spraying. 7wt.% Y2O3 partially stabilized ZrO2 (7YSZ) surface ceramic layer 1. The heating temperature for the preheating treatment of the thermal barrier coating is 700°C, and the Nd:YAG solid-state laser with a rated power of 1000W is used to process the an...
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Abstract
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