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Method for cladding tungsten carbide layer on surface of workpiece base material

A technology for the surface of substrates and workpieces, applied in the field of laser cladding to prepare alloy coatings, can solve the problems of high process cost, insufficient improvement in wear resistance, corrosion resistance, heat resistance, oxidation resistance and other properties of laser cladding workpieces. , to achieve the effect of improving the antioxidant capacity, improving the cladding effect, and reducing the difference

Pending Publication Date: 2020-12-29
安徽中科春谷激光产业技术研究院有限公司
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Problems solved by technology

In the existing technology, there are still shortcomings such as insufficient improvement in wear resistance, corrosion resistance, heat resistance, and oxidation resistance of laser cladding workpieces, and high process costs.

Method used

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  • Method for cladding tungsten carbide layer on surface of workpiece base material

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1 Laser cladding

[0027] A method for cladding a tungsten carbide layer on the surface of a workpiece substrate, comprising the following steps;

[0028] 1) Preparation of the base material of the workpiece. Nickel 625 is used as the raw material of the base material of the workpiece. After precision casting, quenching and tempering treatment is carried out to obtain the base material of the workpiece;

[0029] 2) Preparation of the first bottom layer cladding material, take 200 mesh Co powder and 300 mesh CrMoBSi powder and mix according to the mass ratio of 1:20 to obtain the first bottom layer cladding material;

[0030] 3) Preparation of the second bottom cladding material, take 200 mesh Co powder, 200 mesh Al 2 o 3 Powder, 200 mesh ZrO 2 powder and 200 mesh Cr 2 o 3 The powder is mixed according to the mass ratio of 1:2.5:3.7:5 to obtain the second bottom cladding material;

[0031] 4) Preparation of the cladding material for the third bottom laye...

Embodiment 2

[0036] Embodiment 2 surface topography observation and hardness test

[0037] Use Rockwell hardness meter to measure the Rockwell hardness of the surface cladding tungsten carbide layer workpiece cladding layer that embodiment 1 obtains, and its hardness reaches 60HRC; Utilize Zeiss advanced metallographic microscope to observe cladding layer, obtain as follows figure 1 Observation diagram of the surface morphology, the observation diagram shows that the cladding effect of the cladding layer and the base material is better; the surface cladding tungsten carbide layer workpiece obtained in Example 1 is compared with the common laser cladding workpiece, and the results show that the wear resistance, Corrosion, heat resistance, and oxidation resistance have been significantly improved.

[0038] It can be seen from the above embodiments that the process method of the present invention is low in cost, easy to realize automatic process processing, and the wear resistance, corrosion ...

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Abstract

The invention relates to the technical field of alloy coating preparation through laser cladding, in particular to a method for cladding a tungsten carbide layer on the surface of a workpiece base material. The method comprises the following process steps of workpiece base material preparation, cladding material preparation, repeated preheating of the workpiece base material, multi-channel laser cladding gradient coating, hardening and the like. According to the method for cladding the tungsten carbide layer on the surface of the workpiece base material, the nickel-based alloy is adopted as the raw material of the workpiece base material, and the non-pure tungsten carbide powder is adopted as the upper-layer cladding material, so that the difference between the base material and the cladding material is reduced, the cladding effect is improved, and the wear resistance, corrosion resistance, heat resistance and oxidation resistance of the clad base material are improved more remarkably,according to the method, low non-pure tungsten carbide is used as an upper cladding material, so that the toughness can be ensured while the hardness is improved, according to the method, a laser cladding gradient coating processing mode is adopted, and four layers of materials are sequentially cladded on the surface of the workpiece base material, so that the wear resistance, corrosion resistance, heat resistance and oxidation resistance of the base material are greatly improved.

Description

technical field [0001] The invention relates to the technical field of preparing an alloy coating by laser cladding, in particular to a method for cladding a tungsten carbide layer on the surface of a workpiece base material. Background technique [0002] Laser cladding is a process in which external materials are added to the substrate by means of synchronous or preset materials, and the molten pool formed after laser irradiation, and the two are rapidly solidified together to form a cladding layer. The cladding layer of laser cladding has low dilution but strong binding force, and is metallurgically bonded to the substrate, which can significantly improve the wear resistance, corrosion resistance, heat resistance, oxidation resistance or electrical properties of the substrate material surface, so as to achieve surface modification or repair The purpose of meeting the specific performance requirements of the material surface can save a lot of material costs. [0003] Compa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/103C23C24/10
Inventor 李荣
Owner 安徽中科春谷激光产业技术研究院有限公司
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