Thermal spraying self-bonding metal alloy powder with coated composite structure

A composite structure and metal alloy technology, applied in metal processing equipment, metal material coating technology, coating, etc., can solve the problem of metallurgical self-bonding reaction that is difficult to obtain a dense coating between particles, and achieve a firm interface bond Effect

Active Publication Date: 2016-06-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a thermal spraying self-adhesive metal alloy powder with a clad composite structure, which can effectively solve the problem that the existing metal alloy powder is difficult to realize metallurgical self-adhesive reaction in the molten particle deposition process, difficult The problem of obtaining a dense coating with good interparticle bonding

Method used

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  • Thermal spraying self-bonding metal alloy powder with coated composite structure
  • Thermal spraying self-bonding metal alloy powder with coated composite structure
  • Thermal spraying self-bonding metal alloy powder with coated composite structure

Examples

Experimental program
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Effect test

Embodiment 1

[0027] as figure 1 (a) Spherical Ni20Cr powder with a particle size between 50-75 μm and figure 1 The submicron Mo powder shown in (b) is the original powder. After the two are mixed uniformly at a mass ratio of 25 / 75, the ball milling method is used to perform ball milling coating under the protection of an argon atmosphere. After the coating treatment, the result after heat treatment at 1000°C for 30 minutes in a protective atmosphere is as follows: figure 2 shown by figure 2 (a) The cross-sectional morphology of the coated powder shows that the Mo powder is uniformly and densely coated on the outer layer of the Ni20Cr powder with a thickness of about 10 μm. figure 2 (b) It can be seen that a diffusion layer is formed between the cladding layer (white contrast) and the NiCr alloy, that is, the Mo cladding layer and the coated NiCr are metallurgically bonded together, figure 2 The energy spectrum analysis of the powder in (c) shows that there is a Mo diffusion layer be...

Embodiment 2

[0032] Using Mo with a diameter of 0.5 μm to 2 μm and nickel-based self-fluxing alloy powder (Ni35 powder) with a diameter of 50-100 μm, in N 2 Under a protective atmosphere, it was grinded by mechanical alloying for 5 hours, and the Mo particles were evenly covered on the surface of the nickel-based alloy, and then heat-treated at 900°C for 6 hours under a hydrogen atmosphere to obtain Ni35 powder firmly coated with metal Mo.

Embodiment 3

[0034] Use the hydroxyl Ni powder with the original particle size of submicron and the Zn powder with the particle size of 40-100 μm as the original powder, mix them at a mass ratio of 15 / 85, and grind for 4 hours by mechanical alloying under the protective atmosphere of Ar. Ni Uniform coating on the surface of the nickel-based alloy to obtain metal Ni-coated Zn spray powder.

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Abstract

The invention discloses a thermal spraying self-bonding metal alloy powder with a coated composite structure and belongs to the technical field of material processing. The metal alloy powder is composite structural powder formed by coating outer-layer metal and coated metal particles, the surfaces of the coated metal particles are uniformly coated with the coating outer-layer metal, a melting point of the coating outer-layer metal is higher than a melting point of the coated metal particles, the coating layer and the coated metal particles are metallurgically bonded to form the composite structural powder. When a metal alloy coating prepared by the composite structural powder is adopted, due to the fact that metallurgical bonding reaction occurs between the coating and a substrate and also occurs among particle layer interfaces in the coating, the interface bonding can be firm, accordingly the bonding strength between the coating and the substrate and the cohesion bonding strength of the particle layers in the coating are remarkably improved, and the long-term usage stability of the coating is ensured. The metal alloy coating prepared by the metal alloy powder has excellent corrosion resistance properties.

Description

technical field [0001] The invention belongs to the technical field of material processing, and relates to thermal spraying self-adhesive metal alloy powder with cladding composite structure. Background technique [0002] Plasma spraying and powder flame spraying are important methods for preparing metal alloy coatings and improving the service performance of metal materials using spraying powder as raw materials. Since the coating is to send powder of a certain composition and structure into a heat source such as a plasma jet or a combustion flame through a powder feeding mechanism, heat sources such as a plasma jet heat the powder to a molten or nearly molten state, and then collide with the substrate in turn. Formation, the bonding strength of the coating and the substrate affects and determines the load that the coating can bear, thus affecting the integrity of the coating system. When the load is large, for the coating with low bonding strength, the service loading may ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/04C23C4/08C23C4/134C23C16/16C23C16/14
CPCC23C4/08C23C16/14C23C16/16B22F9/04B22F2009/041B22F1/17
Inventor 李长久田佳佳雒晓涛李成新杨冠军
Owner XI AN JIAOTONG UNIV
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