Application of WC-10Co-4Cr powder in preparation of wear-resistant layer on surface of paired roller

Abstract

The invention provides application of WC-10Co-4Cr powder in preparation of a wear-resistant layer on the surface of a roller pair, and belongs to the technical field of industry. The WC-10Co-4Cr powder is used as a spraying material for the surfaces of the pair rollers, the wear-resistant layers on the surfaces of the pair rollers are prepared by adopting a high velocity oxy-fuel spraying method, the wear-resistant layers and the pair rollers are metallurgically bonded, the wear-resistant layers are not easy to peel off, the hardness of the wear-resistant layers is high, and the wear-resistant layers can keep excellent performance in a high-temperature and corrosive environment; and the service life is 3-5 times of that of a pair roller not sprayed with the wear-resistant layer.

Description

Technical Field

[0001] The invention belongs to the field of industrial technology, and in particular relates to application of WC-10Co-4Cr powder in preparing a wear-resistant layer on the surface of a roller. Background Art

[0002] An extrusion granulator is a device that extrudes powdered or granular materials into granules of a certain shape and size. It is widely used in the fertilizer, chemical, feed, and food industries. After entering the extrusion system, the material is clamped by a pair of rollers that rotate relative to each other. The surface of the rollers is usually designed with a specific shape (such as teeth, grooves, or flat surfaces) to extrude the material into shape. When the granulator processes some corrosive fertilizers or chemical materials, the insufficient corrosion resistance of the rollers can lead to surface corrosion, which in turn accelerates wear. When the rollers are worn, their service life is reduced. Although the rollers are made of wear-resistant materials, they may still wear rapidly in complex processing environments due to the combined effects of high temperature, high pressure, and corrosive materials. Summary of the Invention

[0003] In light of this, the present invention aims to provide a method for using WC-10Co-4Cr powder in the preparation of a wear-resistant layer on the surface of a roller. This method utilizes WC-10Co-4Cr powder as a spraying material for the roller surface, using a supersonic flame spraying method to produce a wear-resistant layer on the roller surface. The wear-resistant layer is metallurgically bonded to the roller, resists flaking, exhibits high hardness, and maintains excellent performance in high-temperature and corrosive environments, resulting in a service life 3 to 5 times that of rollers without a sprayed wear-resistant layer.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] The invention provides an application of WC-10Co-4Cr powder in preparing a wear-resistant layer on the surface of a roller.

[0006] The present invention provides a method for preparing a wear-resistant layer on the surface of a roller, comprising: sandblasting the surface of the roller with brown corundum, and then spraying WC-10Co-4Cr powder on the surface of the roller with a supersonic flame spraying method to obtain the wear-resistant layer on the surface of the roller.

[0007] Preferably, the particle size of the brown corundum is 0.52-0.53 mm.

[0008] Preferably, the particle size of the brown corundum is 0.526 mm.

[0009] Preferably, the supersonic flame spraying method includes: a spraying distance of 380 to 420 mm, a powder feeding amount of 60 to 100 g / min, an oxygen flow rate of 830 to 870 L / min, and a kerosene flow rate of 12 to 18 L / h.

[0010] Preferably, the supersonic flame spraying method includes: a spraying distance of 400 mm, a powder feeding amount of 80 g / min, an oxygen flow rate of 850 L / min, and a kerosene flow rate of 15 L / h.

[0011] The present invention also provides a pair of wear-resistant rollers prepared by the above preparation method.

[0012] The present invention also provides application of the wear-resistant pair of rollers in the preparation of an extrusion granulator.

[0013] The present invention uses WC-10Co-4Cr powder as the spray material for the roller surface, and uses a supersonic flame spraying method to produce a wear-resistant layer on the roller surface. The wear-resistant layer is metallurgically bonded to the roller, making it less susceptible to flaking. The wear-resistant layer has high hardness and can maintain excellent performance in high-temperature and corrosive environments, with a service life 3 to 5 times that of rollers without the wear-resistant layer. In a specific embodiment of the present invention, the wear-resistant layer produced on the roller surface has a thickness of 150 to 200 μm, a hardness of 1200 to 1500 HV, and a surface roughness of Ra 0.2 to 0.8. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a physical picture of the wear-resistant layer on the roller surface. DETAILED DESCRIPTION

[0015] The invention provides an application of WC-10Co-4Cr powder in preparing a wear-resistant layer on the surface of a roller.

[0016] The present invention has no special limitation on the source of WC-10Co-4Cr powder, and conventional commercial products in the art can be used.

[0017] The present invention provides a method for preparing a wear-resistant layer on the surface of a roller, comprising: sandblasting the surface of the roller with brown corundum, and then spraying WC-10Co-4Cr powder on the surface of the roller with a supersonic flame spraying method to obtain the wear-resistant layer on the surface of the roller.

[0018] In the present invention, the particle size of the brown corundum is preferably 0.52-0.53 mm, more preferably 0.526 mm.

[0019] In the present invention, the supersonic flame spraying equipment is preferably HV-8000.

[0020] The present invention also provides a pair of wear-resistant rollers prepared by the above preparation method.

[0021] The present invention also provides application of the wear-resistant pair of rollers in the preparation of an extrusion granulator.

[0022] The technical solutions provided by the present invention are described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0023] Example 1

[0024] First, the roller surfaces were sandblasted with brown corundum (0.526mm particle size) for preparation. A wear-resistant layer was then applied to the roller surfaces using a HV-8000 supersonic flame spraying machine (WC-10Co-4Cr) powder. The spraying parameters were: spray distance 400mm, powder feed rate 80g / min, oxygen flow rate 850L / min, and kerosene flow rate 15L / h.

[0025] Samples were cut from the roller using wire cutting, and the coating hardness was tested using an HV-1000SPTA micro-Vickers hardness tester (Laizhou Weiyi Testing Instrument Manufacturing Co., Ltd.). A load of 9.8 N was applied for 10 seconds, and the average microhardness was obtained at five different locations. The sample thickness before and after spraying was measured using a micrometer. The surface roughness of the coating was measured using a roughness tester.

[0026] The coating thickness is 150-200μm, the hardness is 1200-1500HV, and the surface roughness is Ra 0.2-0.8. Figure 1 shown.

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. Application of WC-10Co-4Cr powder in preparing wear-resistant layer on roller surface.

2. A method for preparing a wear-resistant layer on the surface of a roller, characterized in that: include: The surface of the roller is sandblasted with brown corundum, and then WC-10Co-4Cr powder is sprayed on the surface of the roller by supersonic flame spraying to obtain a wear-resistant layer on the surface of the roller.

3. The method for preparing a wear-resistant layer on the surface of a roller according to claim 2, characterized in that: The particle size of the brown corundum is 0.52-0.53 mm.

4. The method for preparing a wear-resistant layer on the surface of a roller according to claim 3, characterized in that: The particle size of the brown corundum is 0.526 mm.

5. The method for preparing a wear-resistant layer on the surface of a roller according to claim 2, characterized in that: The supersonic flame spraying method includes: a spraying distance of 380-420 mm, a powder feeding amount of 60-100 g / min, an oxygen flow rate of 830-870 L / min, and a kerosene flow rate of 12-18 L / h.

6. The method for preparing a wear-resistant layer on the surface of a roller according to claim 5, characterized in that: The supersonic flame spraying method includes: a spraying distance of 400 mm, a powder feeding amount of 80 g / min, an oxygen flow rate of 850 L / min, and a kerosene flow rate of 15 L / h.

7. A wear-resistant pair of rollers prepared by the method for preparing a wear-resistant layer on the surface of a pair of rollers according to any one of claims 2 to 6.

8. Use of the wear-resistant pair of rollers according to claim 7 in the preparation of an extrusion granulator.

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