Preparation method of composite coating containing in situ generated diffusion barrier
A composite coating, in-situ generation technology, applied in the direction of coating, metal material coating process, superimposed layer plating, etc., can solve the problem of high cost of diffusion barrier layer, achieve reliable coating quality, reduce cost, process reliable results
Inactive Publication Date: 2011-04-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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[0006] The purpose of the present invention is to provide a method for preparing a composite coating containing an in-situ-generated diffusion barrier, utilizing the composition redistribution characteristics of the composite coating composed of AlSiY coating and MCrAlY coating during the annealing process, and combining the The Re-Ni coating deposited on the substrate generates a dense intermediate layer mainly composed of CrCoRe on the coating / substrate interface in situ, replacing the diffusion barrier layer composed entirely of refractory elements, so as to solve the current problem of preparing the diffusion barrier layer. costly problem
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[0036] First, the Ni-based superalloy substrate (composition is shown in Table 1) is pretreated:
[0037] (1) Conventional pretreatment, pre-grinding and ultrasonic treatment of the substrate, ordering the shape, and cleaning the surface oil;
[0038](2) Before electroplating Re-Ni, the electrochemical corrosion method must be used to remove the residual scale on the surface of the substrate. The specific process is: 85wt% concentrated H 3 PO 4 and 98.3wt% concentrated H 2 SO 4 Mix with water at a volume ratio of 4-5:1:2, heat to 70°C, put the substrate into it as an anode, electrolyze it at 2.5-2.8V for 3 minutes, and take it out. The cathode material is a nickel plate;
[0039] Then, the Ni-based superalloy substrate is suspended in the plating solution as a cathode, and electroplating is carried out according to the following steps:
[0040] Prepare the plating solution one day in advance, the composition of the plating solution is citric acid 0.3mol / L, NiSO 4 ·6H 2 O...
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Abstract
The invention relates to a technology for preparing a high-temperature protection composite coating on a high-temperature alloy matrix, in particular to a preparation method of a composite coating containing a diffusion barrier generated in situ. In the invention, a multilayer film deposited in advance is used, and related heat treatment rules are combined to prepare the composite coating which can inhibit coating elements from diffusing to the matrix at high temperature, thereby prolonging the service life of the coating. The invention has the following technological processes: firstly, pretreating the high-temperature alloy matrix; then, preparing a layer of sub-micron level Re-Ni plating by an electroplating technology; after finishing the post treatment step of electroplating, sequentially depositing a layer of MCrAlY coating and a layer of AlSiY coating on the Re-Ni plating; and finally, carrying out related heat treatment on the multilayer film, and generating the diffusion barrier in the position of the original Re-Ni plating. The invention effectively solves the problem of high preparation cost of the Re plating, and obtains the composite coating containing the uniform continuous diffusion barrier by simple heat treatment.
Description
technical field [0001] The invention relates to the technology of preparing high-temperature protective composite coatings on superalloy substrates, specifically a method for preparing composite coatings containing in-situ generated diffusion barriers, which utilizes pre-deposited multilayer films and combines relevant heat treatment systems , to prepare a composite coating that can inhibit the diffusion of coating elements to the substrate under high temperature conditions, thereby improving the service life of the coating. Background technique [0002] As a high-temperature alloy for aeroengine turbine blades, it usually includes nickel-based and cobalt-based alloys. Under service conditions, in addition to excellent high temperature and room temperature mechanical properties, superalloys should also have good oxidation resistance. At present, one solution is to coat the surface with a high-temperature protective coating, and use the oxidation resistance of the coating to...
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IPC IPC(8): C23C28/02C25F1/04C25D3/12C23C14/32C23C14/58
Inventor 孙超马军姜肃猛宫骏李海庆王维新刘山川闻立时
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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