Method for preparing functionally gradient composite coating in osmosis plating
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A functional gradient and composite coating technology, which is applied in the coating, metal material coating process, electrolytic coating, etc., can solve the problems of low binding force, uneven distribution, low content of strengthening phase, etc., and achieve high binding force and easy operation. The effect of convenience, excellent mechanical properties and high temperature performance
Inactive Publication Date: 2012-03-21
NANCHANG HANGKONG UNIVERSITY
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[0005] The purpose of the present invention is to provide a method for preparing functionally graded composite coatings by infiltration plating. The composite coatings prepared by this method have the characteristics of chemical composition, structure, mechanical properties, and high-temperature properties that are gradients and continuously change along the thickness direction of the coating. It overcomes the disadvantages of low strengthening phase content, uneven distribution and low bonding force with the matrix in the traditional electroplating and electroless plating composite coatings, eliminates the interface stress between two consecutive layers in the composite coating, and avoids the thermal expansion of the matrix and the strengthening phase The thermal stress caused by the mismatch of coefficients, so as to obtain a composite coating with no porosity, no cracks and excellent comprehensive properties
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Embodiment 1
[0020] Ni-SiC functionally graded composite coating was prepared on the surface of flat workpiece GH4169 nickel-based superalloy by penetration electroplating. 90vol.% gradient distribution.
[0021] The implementation process of this embodiment is, as figure 1 and figure 2 shown.
[0022] (1) Pretreatment of the substrate surface. Sand blast or polish, degrease, etch and weakly etch the surface of GH4169 nickel-based superalloy 1;
[0023] (2) Increase the distribution density of strengthening phase SiC particles 9 with an average particle size of 10 nm on the surface of the permeable membrane 10 by 0-90% by spraying or rolling, and then place the permeable membrane on the surface of the GH4169 nickel-based superalloy 1, Among them, the pore size of the permeable membrane is 6nm, the material is organic membrane polyamide, and the structure adopts plate and frame type;
[0024] (3) Place the GH4169 nickel-based superalloy 1 adhered to the permeable membrane 10 (the stre...
Embodiment 2
[0028] Preparation of Cu-TiB on 45 Steel Surface of Round Bar Workpiece by Infiltration Electroless Plating 2 Functionally graded composite coating, the thickness of the coating is 1.5mm, and the strengthening phase TiB with an average particle size of 40μm 2 The particles are distributed in a gradient of 0-90vol.% along the thickness direction of the coating.
[0029] The implementation process of this embodiment is, as figure 2 and image 3 shown.
[0030] (1) Pretreatment of the substrate surface. Sand blast or polish, degrease, etch and weakly etch the surface of 45 steel 1;
[0031] (2) The reinforcement phase TiB with an average particle size of 40 μm is sprayed or rolled 2 The distribution density of particles 9 on the surface of the permeable membrane 10 is increased by 0-90%, and then the permeable membrane is placed on the surface of 45 steel 1, wherein the pore diameter of the permeable membrane 10 is 25 μm, and the material is inorganic TiO 2 Ceramic membran...
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Abstract
The invention discloses a method for preparing a functionally gradient composite coating by using an osmosis membrane in electroplating or chemical plating. The method is applicable to the surface strengthening, decorating and repairing of various electroplating or chemical plating parts and comprises the following steps: (1) sand blasting or polishing, oil removing, etching and weak etching treatment for the surface of a base material; (2) increasing the distribution density of the strengthening phase particles by 0-90% on the surface of the osmosis membrane by adopting a flame plating or roller coating method and then placing the osmosis membrane on the surface of the base material; (3) osmosis plating in a coating bath with prepared coating solution; and (4) repeating the steps (2) and(3) until the coating reaches the required thickness, otherwise, the work stops. The method has the advantages that: (1) the bond strength of the composite coating and the base material is high, the composite coating is not easy to strip off, the strengthening phase particles are in gradient distribution along the thickness direction of the coating, and the content of the outermost layer can reach 90vol.%; (2) the surface hardness of the composite coating can reach 55-80HRC, the salt spray resistance test can reach 30-12000 hours, and the composite coating can work continuously for 4000 hoursat the high temperature of 1100 DEG C; (3) the surface is smooth and bright, and reprocessing and polishing treatment is not required; and (4) the size and shape of the workpiece are not limited, thedeformation is avoided in the osmosis plating process, the worn workpiece with processing error can be repaired, and a deep blind hole and an inner cavity with a complicated shape can be processed ifthe osmosis chemical plating is adopted.
Description
technical field [0001] The invention relates to a method for preparing a functionally graded composite coating, in particular to a method for preparing a functionally graded composite coating by infiltration plating. Background technique [0002] Composite coating is a coating with new properties deposited on the surface of the substrate by two or more materials with different properties through physical or chemical methods. Because the various materials that make up the composite coating complement and coordinate with each other in performance, the overall performance of the composite coating is better than that of the original constituent materials, which can meet the requirements of various working conditions. Therefore, composite coatings have broad application prospects in the field of surface strengthening and repairing of key parts that are prone to wear and corrosion, such as aerospace, machinery manufacturing, metallurgy, chemical industry and electric power. [00...
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