Method for preparing heat insulation coating specific to thin-walled metal part
A heat-insulating coating and metal parts technology, which is applied in the direction of metal material coating process, coating, molten spraying, etc., can solve the problems of structural instability, low bonding force between coating and substrate, deformation, etc., and achieve improved bonding Strength, surface roughness improvement, and reliability assurance effects
Inactive Publication Date: 2018-05-18
BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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Problems solved by technology
However, metal thin-walled parts are prone to structural instability and deformation during the surface blasting process before spraying. If the surface roughening effect is not good, it will easily cause low bonding force between the coating and the substrate.
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Embodiment 1
[0020] A method for preparing a thermal insulation coating for thin-walled metal parts, comprising the steps of:
[0021] (1) Prepare a superalloy substrate with a thickness of 2mm, 3mm, and 4mm, and use the sand blowing process (pressure-0.4MPa, jet angle-70°, distance-120mm, sand particle size-40 mesh) to roughen the surface of the substrate, and find that The deformation of the superalloy substrate with a thickness of 2mm exceeds 1mm;
[0022] (2) It is detected that the droplet size of zirconia powder formed in the plasma flame is 50μm-100μm, see figure 1 According to the size, the laser is used to process hemispherical small holes on the surface of the superalloy substrate. The surface roughness of the substrate after laser treatment is Ra=6.27μm, and the deformation is less than 0.1mm; see figure 2 ,Depend on image 3 It can be seen that the interface between the substrate and the coating after laser texturing has low porosity and dense layered structure.
[0023] (3...
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The invention belongs to the technical field of spraying, and particularly relates to a plasma spraying method for preparing a heat insulation coating specific to a thin-walled metal part. A laser texturing technology is adopted for conducting surface roughening treatment on the thin-walled metal part, the roughness required by a plasma spraying process is reached, meanwhile, 50-100-micron small hemispherical holes are machined in the surface of a metal substrate, the hole diameter is matched with the diameter of droplets formed by plasma jet, and thus the binding force of the coating with thethin-walled metal substrate is further improved. The surface roughness of the thin-walled metal substrate is improved through the laser texturing treatment, the deformation degree of the substrate inthe roughening process is controlled, the precise and controllable small hemispherical holes are machined in the surface of the substrate, the size of the small holes is matched with that of the droplets formed in plasma jet, the binding strength of the substrate and the coating is further improved, and the reliability of the surface coating of the thin-walled metal substrate is ensured.
Description
technical field [0001] The invention belongs to the technical field of spraying, and in particular relates to a method for preparing a thermal insulation coating for thin-walled metal parts by plasma spraying. Background technique [0002] Plasma spraying, as a commonly used thermal protection material processing technology in aerospace, has the advantages of wide range of sprayed materials, dense coating, and high bonding strength. However, metal thin-walled parts are prone to structural instability and deformation during the surface blasting process before spraying. If the surface roughening effect is not good, the bonding force between the coating and the substrate will be low. Laser texturing is a complex metallurgical physical and chemical process in which laser interacts with matter. The pulsed laser beam with high energy density and high repetition rate is focused on the surface of the material, and the light energy is converted into heat energy of the material to in...
Claims
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Login to View More IPC IPC(8): C23C4/134C23C4/02
CPCC23C4/134C23C4/02
Inventor 田伟智毕荣荣樊喜刚
Owner BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP