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A Novel High Impact Toughness Amorphous Matrix Composite Coating and Its Preparation Method

A composite coating, high-impact technology, applied in coatings, chemical instruments and methods, metal material coating technology, etc., can solve the problem of accurately controlling the uniform distribution of second-phase particles and reducing the corrosion resistance of amorphous-based composite coatings problems such as chemical potential difference between the second phase and the amorphous phase, etc., to achieve the effects of improving service performance and service life, good high temperature wettability, and adjustable performance

Inactive Publication Date: 2016-01-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the dispersion-enhanced amorphous matrix composite coating has the following two disadvantages: 1) it is difficult to accurately control the uniform distribution of the second phase particles in the amorphous matrix; 2) due to the chemical potential difference between the second phase and the amorphous phase, resulting in Both are prone to galvanic corrosion, thereby reducing the corrosion resistance of the amorphous-based composite coating

Method used

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  • A Novel High Impact Toughness Amorphous Matrix Composite Coating and Its Preparation Method
  • A Novel High Impact Toughness Amorphous Matrix Composite Coating and Its Preparation Method
  • A Novel High Impact Toughness Amorphous Matrix Composite Coating and Its Preparation Method

Examples

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Embodiment 1

[0035] Example 1 (with NiCrAl coating as the crystalline metal coating, the composite coating contains 2 layers of amorphous alloy coating and 2 layers of crystalline metal coating)

[0036] The composite coating of the present embodiment adopts the following steps:

[0037] (1) Firstly, the alloy ingot is prepared by vacuum induction melting according to the above-mentioned required components, and then the alloy ingot is remelted in an atomization furnace, and amorphous alloy powder and crystalline metal are prepared by inert gas atomization technology powder.

[0038] (2) The supersonic flame spraying technology (HVOF) is used to prepare the amorphous matrix composite coating. The specific process parameters are kerosene and oxygen flow rates of 24L / h and 32m respectively. 3 / h, the powder feeding speed is 30g / min, and the spraying distance is 350mm. First, a layer of NiCrAl coating with a thickness of about 50μm is prepared on the surface of No. 45 steel substrate.

[00...

Embodiment 2

[0045] Example 2 (Using NiCrAl coating as the crystalline metal coating, the composite coating contains 3 layers of amorphous alloy coating and 3 layers of crystalline metal coating)

[0046] The difference from Example 1 is:

[0047] 1) The composite coating prepared in this example contains 3 layers of amorphous alloy coating and 3 layers of crystalline metal coating, such as figure 1 shown;

[0048] 2) The composite coating prepared in this example has a higher bonding strength, reaching 40MPa, such as figure 2 shown;

[0049] 3) The composite coating prepared in this example has higher impact toughness, reaching 17.6J, such as image 3 shown.

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Abstract

The invention provides a novel amorphous matrix composite coating with high impact toughness and a preparation method thereof. The composite coating is composed by interactively overlapping an iron-based amorphous alloy coating and a crystalline metal coating; the crystalline metal coating is in direct contact with a matrix; the iron-based amorphous alloy coating is on the outmost layer of the composite coating; the interfaces of the amorphous coating and the crystalline coating in the composite coating are tightly combined without continuous gaps; the composite coating is acquired through a hypersonic flame spraying technology; the composite coating can be tightly bonded with a metal matrix; the impact toughness of the composite coating is much higher than that of a single-phase iron-based amorphous alloy coating. The composite coating acquired by the invention can be extensively coated on the surfaces of all kinds of metal matrixes and has wide application prospects in the surface antiseptic and anti-wear treatment of devices and components in many fields of boat decks, oil-gas field development, petrochemical industry and water conservancy and hydropower.

Description

technical field [0001] The invention relates to a novel high-impact-toughness amorphous base composite coating and a technical method for preparing the composite coating, belonging to the field of composite coatings. Background technique [0002] Amorphous alloy is a new metastable metal material developed in recent years with both structure and function integration. This type of alloy (mainly low-cost iron-based amorphous system) is coated on the surface of various metal substrates by thermal spraying technology, which can greatly improve the service life and service performance of the material, such as corrosion resistance, wear resistance, magnetic shielding and Radiation resistance, etc. Therefore, since the iron-based amorphous coating was developed by developed countries such as Japan and the United States at the end of the last century, it has attracted widespread attention worldwide due to its excellent performance. This type of coating is considered to have potent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/01B32B15/18C23C4/12C23C4/08C23C4/06C23C4/073C23C4/129
Inventor 柳林张诚周欢
Owner HUAZHONG UNIV OF SCI & TECH
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