Composite coating for lead-based reactor pump impeller and preparation method of composite coating

A lead-based reactor, composite coating technology, applied in the coating, metal material coating process, melt spraying and other directions, can solve the problems of liquid lead alloy corrosion of structural materials, etc., to alleviate the problem of cracking and peeling, good resistance to lead Alloy corrosion performance, thermal stress relief effect

Pending Publication Date: 2022-04-12
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although the lead-based reactor has many excellent characteristics, it faces a unique problem, that is, the liquid lead alloy will corrode the structural material in contact with it. Therefore, the corrosion resistance of the structural material determines the structural design and Long-term stable and safe operation

Method used

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  • Composite coating for lead-based reactor pump impeller and preparation method of composite coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The composite coating for a lead-based reactor pump impeller of this embodiment adopts a three-layer gradient composite structure; the innermost layer of the three-layer gradient composite structure is composed of a high-entropy alloy coating whose chemical composition and thermal expansion coefficient match the metal matrix The outermost layer is made of Ti with good wear resistance and excellent corrosion resistance to lead alloy erosion. 3 AlC 2 Coating, the middle layer is made of high entropy alloy and Ti 3 AlC 2 Composite coating, and the Ti in the middle layer 3 AlC 2 The mass ratio is 50%. Wherein, the high-entropy alloy used in the innermost layer and the middle layer is specifically composed of Fe, Cr, Ni, and Al in a molar ratio of 1:1:1:1.

[0031] The preparation method of the composite coating for the above-mentioned lead-based reactor pump impeller:

[0032] S1, preparation of spray powder

[0033] Innermost layer: The spray powder is high-entropy ...

Embodiment 2

[0043] The composite coating for a lead-based reactor pump impeller of this embodiment adopts a three-layer gradient composite structure; the innermost layer of the three-layer gradient composite structure is composed of a high-entropy alloy coating whose chemical composition and thermal expansion coefficient match the metal matrix The outermost layer is made of Ti with good wear resistance and excellent corrosion resistance to lead alloy erosion. 3 AlC 2 Coating, the middle layer is made of high entropy alloy and Ti 3 AlC 2 Composite coating, and the Ti in the middle layer 3 AlC 2 The mass ratio is 50%. Wherein, the high-entropy alloy used in the innermost layer and the middle layer is specifically composed of Fe, Cr, Ni, Al, and Ti in a molar ratio of 1:1:1:1:0.2.

[0044] The preparation method of the composite coating for the above-mentioned lead-based reactor pump impeller:

[0045] S1, preparation of spray powder

[0046] Innermost layer: The spray powder is high-...

Embodiment 3

[0056] The composite coating for a lead-based reactor pump impeller of this embodiment adopts a three-layer gradient composite structure; the innermost layer of the three-layer gradient composite structure is composed of a high-entropy alloy coating whose chemical composition and thermal expansion coefficient match the metal matrix The outermost layer is made of Ti with good wear resistance and excellent corrosion resistance to lead alloy erosion. 3 AlC 2 Coating, the middle layer is made of high entropy alloy and Ti 3 AlC 2 Composite coating, and the Ti in the middle layer 3 AlC 2 The mass ratio is 50%. Wherein, the high-entropy alloy used in the innermost layer and the middle layer is specifically composed of Fe, Cr, Ni, Al, and Ti in a molar ratio of 1:1:1:1:0.2.

[0057] The preparation method of the composite coating for the above-mentioned lead-based reactor pump impeller:

[0058] S1, preparation of spray powder

[0059] Innermost layer: The spray powder is high-...

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Abstract

The invention provides a composite coating for a lead-based reactor pump impeller. The composite coating adopts a three-layer gradient composite structure; the innermost layer of the three-layer gradient composite structure is composed of a high-entropy alloy coating matched with a metal matrix in chemical composition and thermal expansion coefficient, the outermost layer of the three-layer gradient composite structure is composed of a Ti3AlC2 coating good in abrasion resistance and excellent in lead alloy erosion corrosion resistance, the middle layer of the three-layer gradient composite structure is composed of a high-entropy alloy and a Ti3AlC2 composite coating, and the mass ratio of Ti3AlC2 in the middle layer is 40-60%. Wherein the high-entropy alloy is composed of Fe, Cr, Ni, Al and Ti according to the molar ratio of 1: 1: 1: 1: (0-0.4). The invention also provides a preparation method of the coating. Through the gradient structure design, the thermal stress between the coating and a metal matrix can be relieved, the binding force between the coating and the matrix is improved, and the friction resistance and corrosion resistance of the coating are considered, so that the high-flow-velocity lead alloy erosion corrosion resistance of the coating is improved.

Description

technical field [0001] The invention relates to the technical field of protective coatings, in particular to a composite coating for a lead-based reactor pump impeller and a preparation method thereof. Background technique [0002] Lead-based reactors using liquid lead alloys as coolants have good neutronics, thermohydraulics, and safety characteristics, and have become prime candidates for fourth-generation advanced nuclear energy systems, accelerator-driven subcritical nuclear energy systems (ADS), and fusion reactors One of the heap types. [0003] Although the lead-based reactor has many excellent characteristics, it faces a unique problem, that is, the liquid lead alloy will corrode the structural material in contact with it. Therefore, the corrosion resistance of the structural material determines the structural design and Long-term stable and safe operation. Compared with other components in the reactor, the service conditions of the nuclear main pump are more sever...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/06C23C4/10C23C4/073B22F9/04
CPCY02E30/30
Inventor 肖尊奇姜志忠罗林刘静万毅卫捷
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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