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Preparation method of WC-Ni hard alloy coating for nuclear main pump components

A technology of cemented carbide and parts is applied in the field of preparation of WC-Ni cemented carbide coating for nuclear main pump parts, which can solve the problems of complex, limited, and difficult machining and manufacturing of envelopes, and achieve low production costs. , Improve the effect of wear resistance and stable operation

Inactive Publication Date: 2013-03-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2000, Hou Huoran of the General Institute of Iron and Steel Research combined hot isostatic pressing with thermal spraying. Through the effect of hot isostatic pressing, the pores of the coating were reduced, and its density was significantly improved. At the same time, element diffusion occurred between the coating and the substrate. Diffusion connection is formed to improve the bonding strength of the coating. The hot isostatic pressing treatment greatly improves the mechanical properties of the coating, and the wear resistance is increased by nearly 7 times. However, the hot isostatic pressing treatment usually requires the preparation of a sheath (or model), It is required that the sheath must be soft and airtight at the temperature of the hot isostatic pressing process, and the shape of the sheath is generally more complicated and difficult to machine. The design and manufacture of the hot isostatic pressing sheath has always been a limitation A major problem in the development of pressure technology
Although this method can save the conventional sheathing process and avoid the diffusion of the sheathing material and affect the forming quality of the workpiece, this method does not actually form the hot isostatic pressing sheathing structure, which reduces the pores of the coating and improves its density is still limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Utilize the inventive method to prepare the WC-10Ni cemented carbide coating of 100 μm on the AISI 304L austenitic stainless steel substrate, the preparation steps are as follows:

[0017] a) Before the high-current pulsed ion beam irradiation, first perform conventional cleaning treatment on the surface of the AISI304 stainless steel substrate to be treated to remove the oil and impurities on the surface;

[0018] b) Depositing a WC-10Ni cemented carbide coating with a density of 80% and a thickness of 100 μm on the AISI304 stainless steel substrate treated in step a) by plasma spraying;

[0019]c) The sample prepared in step b) is placed in the processing chamber of the high-current pulsed ion beam device, so that the cleaned surface to be treated is completely exposed to the irradiation area of ​​the high-current pulsed ion beam line, and the vacuum of the device is turned off chamber and evacuated to a vacuum of 1.1×10 -2 Pa;

[0020] d) At room temperature, the i...

Embodiment 2

[0023] Utilize the inventive method to prepare the WC-10Ni cemented carbide coating of 150 μm on the PH17-4 martensitic stainless steel substrate, the preparation steps are as follows:

[0024] a) Before the high-current pulsed ion beam irradiation, first perform conventional cleaning treatment on the surface to be treated of the PH17-4 martensitic stainless steel substrate to remove the oil and impurities on the surface;

[0025] b) Depositing a WC-10Ni cemented carbide coating with a density of 88% and a thickness of 150 μm on the PH17-4 martensitic stainless steel substrate treated in step a) by plasma spraying;

[0026] c) The sample prepared in step b) is placed in the processing chamber of the high-current pulsed ion beam device, so that the cleaned surface to be treated is completely exposed to the irradiation area of ​​the high-current pulsed ion beam line, and the vacuum of the device is turned off chamber and evacuated to a vacuum of 1.3×10 -2 Pa;

[0027] d) At ro...

Embodiment 3

[0030] Utilize the inventive method to prepare the WC-8Ni cemented carbide coating of 200 μm on the 2Cr13 martensitic stainless steel substrate, the preparation steps are as follows:

[0031] a) Before the high-current pulsed ion beam irradiation, the surface of the 2Cr13 stainless steel substrate to be treated is firstly cleaned to remove oil and impurities on the surface;

[0032] b) Depositing a WC-8Ni cemented carbide coating with a density of 85% and a thickness of 100 μm on the 2Cr13 stainless steel substrate treated in step a) by plasma spraying;

[0033] c) The sample prepared in step b) is placed in the processing chamber of the high-current pulsed ion beam device, so that the cleaned surface to be treated is completely exposed to the irradiation area of ​​the high-current pulsed ion beam line, and the vacuum of the device is turned off chamber and evacuated to a vacuum degree of 1.0×10 -2 Pa;

[0034] d) At room temperature, the ion beam composition is 30% carbon i...

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Abstract

The invention discloses a preparation method of a WC-Ni hard alloy coating for nuclear main pump components, belonging to the technical field of material surface engineering. The preparation method comprises the following steps of: firstly, conventionally cleaning the to-be-treated surface of the nuclear main pump component; depositing a WC-Ni hard alloy coating on the surface of the nuclear main pump component by a thermal spraying method; carrying out 2-10 times of irradiation on the WC-Ni hard alloy coating on the surface of the nuclear main pump component by the high-intensity pulsed ion beam with pulse width of 50-100ns and beam current density of 20-350A / cm<2>, and generating 1-10 micrometers of remelted continuous compact jacketing layer in site on the surface of the WC-Ni hard alloy coating; carrying out high pressure hot isostatic pressing with the remelted jacketing layer to form an integrally compact and high-bonding strength WC-Ni hard alloy coating. The preparation method has the advantages that the coating is high in compactness and excellent in bonding performance with the base body; and the performances, such as wear resistance, corrosion resistance, thermal shock resistance and radiation resistance, of the nuclear main pump components can be improved remarkably, and long-term reliable and steady operation of the nuclear main pump is guaranteed.

Description

technical field [0001] The invention relates to a method for preparing a WC-Ni hard alloy coating for nuclear main pump parts, belonging to the technical field of material surface engineering. technical background [0002] The key components of nuclear main pumps, such as water-lubricated bearings, mechanical seal components, and the assembly and cooperation of shafts and other components, work in extremely harsh environments such as high temperature, high pressure, high speed, and nuclear radiation. The surface of the components is required to meet wear resistance. Performance requirements such as wear resistance, corrosion resistance, thermal shock resistance and radiation resistance ensure the service life of key components and the stability of the system to achieve long-term safe and stable operation. Thermal spraying technology is to heat the sprayed material to a molten or semi-molten state through a heat source, and accelerate (or accelerate after atomization) to form...

Claims

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Application Information

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IPC IPC(8): C23C4/18C23C24/10
Inventor 雷明凯朱小鹏张锋刚李昱鹏郭浩
Owner DALIAN UNIV OF TECH
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