Coating with super bonding strength and preparation method thereof

A super-combination and coating technology, applied in coatings, metal material coating processes, manufacturing tools, etc., can solve the problem of limiting laser directed energy deposition coatings, increasing the complexity of the manufacturing process, and prone to radial crack delamination To achieve the effect of improving work stability and service life, good metallurgical bonding quality, and reducing crack sensitivity

Pending Publication Date: 2022-03-15
ZHENGZHOU UNIV
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AI Technical Summary

Problems solved by technology

[0003] According to the existing technology proposed above, the strength can be improved but the toughness is sacrificed, and the high-hardness coating is prone to radial cracks and delamination due to the difference in performance between the substrate and the substrate, which reduces the stability of the coating during service and limits laser directed energy deposition. The application of coatings on the surface strengthening of parts; although these defects can be alleviated by designing and optimizing the composition of coating materials, gradient coating design, heat treatment, etc., new problems will be introduced, such as: elastic-plasticity, increased cost of strengthening , increase the complexity of the manufacturing process and other technical problems, and provide a coating with super bonding strength and its preparation method

Method used

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  • Coating with super bonding strength and preparation method thereof
  • Coating with super bonding strength and preparation method thereof
  • Coating with super bonding strength and preparation method thereof

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preparation example Construction

[0044] As shown in the figure, the present invention provides a method for preparing a coating with super bonding strength, which is a method for improving the bonding strength between the coating and the substrate, and the method includes the following steps:

[0045] - provide a metal substrate;

[0046] —Designing the contour features of the bionic microstructure, the bionic microstructure includes: the wedge-shaped structure imitating cocklebur, the concave arc structure imitating sunflower, the honeycomb honeycomb structure imitating honeycomb, or the biomimetic microstructure imitating inverted pyramid structure;

[0047] —According to the material of the metal matrix provided, select the laser deposition powder material superior to the surface performance of the matrix, the laser deposition powder material includes: iron-based alloy, nickel-based alloy or heterogeneous element reinforced nickel-based composite powder material, optimize the Deposition powder laser deposi...

Embodiment 1

[0066] A manufacturing method for improving the bonding strength between a coating and a substrate. A coating with good metallurgical bonding quality with the substrate and excellent mechanical properties is prepared on the surface of a shaft, specifically comprising the following steps:

[0067] a. Provide cylindrical substrate (45# steel);

[0068] b. The shaft is clamped on the workbench, and the laser processing and manufacturing method is used to process the bionic microstructure on the surface of the shaft with pulsed laser;

[0069] Specifically: the bionic microstructure of the shaft surface needs to be obtained through experiments, the stepping motor controls the rotational movement of the shaft, and adjusts the relative position between the shaft surface to be processed and the focal point of the laser spot according to the optimal working distance of the pulse laser during the experiment, Control the movement of the stepper motor and the laser according to the desig...

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Abstract

The invention provides a coating with super bonding strength and a preparation method thereof.The method comprises the following steps that a base body with a surface to be subjected to laser directional energy deposition is provided, a bionic microstructure is machined on the surface to be subjected to laser directional energy deposition, and the bionic microstructure can be obtained through laser machining, 3D printing, electric spark machining and other manufacturing methods; the machined bionic microstructure can be of a wedge-shaped structure, a concave arc structure, a sawtooth-shaped structure, a honeycomb-shaped structure and the like, the laser directional energy deposition coating is prepared on the surface of the machined bionic microstructure through the laser directional energy deposition technology, and deposition materials can be iron-based alloy, nickel-based alloy, nickel-based composite powder and the like. According to the method, the bionic microstructure is firstly machined on the surface of the base body, then the coating is prepared on the surface of the bionic microstructure through the laser directional energy deposition technology, and the high-performance coating with high metallurgical bonding strength, high hardness and good toughness can be prepared at low cost.

Description

technical field [0001] The invention relates to the technical field of surface strengthening, in particular to a coating with super bonding strength and a preparation method thereof. Background technique [0002] With the development of science and technology, the wear, fatigue damage, corrosion, etc. caused by the blades, gears, shafts and other key parts of high-end equipment such as aero-engines, full-face tunnel boring machines, and large gas turbines under harsh working conditions have become an urgent need for parts failure. Solve the difficult problems, but also cause huge economic losses and waste of resources. Strengthening the surface performance of parts is one of the important ways to improve their service life. Laser Directed Energy Deposition is one of the advanced technologies to obtain high performance coatings. Obtaining high hardness, high strength, good toughness, and good metallurgical bonding interface quality is very important to achieve surface stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10B23H7/00B23K26/352B33Y40/20
CPCC23C24/103B23H7/00B23K26/355B33Y40/20
Inventor 于津苏
Owner ZHENGZHOU UNIV
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