Powder containing metal elements, alloy material for wear-resistant layer of wear plate, wear plate and preparation method and application of wear plate

Abstract

The invention relates to the technical field of engineering materials, and discloses powder containing metal elements, an alloy material for a wear-resistant layer of a wear plate, the wear plate and a preparation method and application of the wear plate. The powder contains a tungsten element, a titanium element, a vanadium element, a molybdenum element, a chromium element, a nickel element and a carbon element; based on the total mass of the powder, the content of the tungsten element is 2-5 wt%, the content of the titanium element is 5-20 wt%, the content of the vanadium element is 5-10 wt%, the content of the molybdenum element is 10-25 wt%, the content of the chromium element is 5-15 wt%, the content of the nickel element is 2-6 wt%, and the content of the carbon element is 2-6 wt%. The wear-resistant layer of the wear plate has the wear resistance equivalent to that of an existing tungsten carbide hard alloy wear-resistant layer, the same wear-resistant layer is adopted for the through holes and the sealing area of the wear plate, and the overall wear resistance is more balanced.

Description

Technical Field

[0001] This invention relates to the field of engineering materials technology, specifically to a powder containing metallic elements, an alloy material for the wear-resistant layer of spectacle plates, spectacle plates, their preparation methods, and applications. Background Technology

[0002] The spectacle plate is a vulnerable component in concrete pumping equipment. It is fixed to the hopper and directly connected to the concrete cylinder, serving a sealing function during concrete pumping. The core function of the spectacle plate is to form a sealing friction pair with the cutting ring at the end of the S-tube. When the S-tube swings to switch the concrete cylinder supply, it achieves continuous delivery and dynamic sealing of high-pressure concrete. During operation, it directly withstands the intense friction of the cutting ring and the high-frequency impact of the concrete mortar.

[0003] The inner walls of the two material conveying through-holes and the sealing area of ​​the spectacle plate are made of wear-resistant materials, which directly affect the lifespan of the spectacle plate. Currently, the mainstream technology for spectacle plates in the industry involves depositing a layer of high-chromium wear-resistant material onto the inner surfaces of the two through-holes, and brazing tungsten carbide cemented carbide material into the entire sealing area. Existing spectacle plate structures with a 5mm thick alloy layer in the sealing area and a 3mm thick weld overlay layer in the through-holes have a lifespan of 30,000-60,000 cubic meters of pumped concrete in different material conditions. Tungsten carbide cemented carbide material has excellent wear resistance, but in recent years, the price of tungsten has been rising continuously, even doubling. Since cemented carbide material accounts for more than half of the cost of spectacle plates, this has led to a significant increase in the final price of spectacle plates.

[0004] Therefore, there is an urgent need to develop a wear-resistant layer material for spectacle plates that has strong wear resistance and low manufacturing cost. Summary of the Invention

[0005] The purpose of this invention is to provide a wear-resistant layer material for spectacle plates that has strong wear resistance and low manufacturing cost.

[0006] To achieve the above objectives, a first aspect of the present invention provides a powder containing metallic elements, wherein the powder contains tungsten, titanium, vanadium, molybdenum, chromium, nickel, and carbon. Based on the total mass of the powder, the content of tungsten is 2-5 wt%, the content of titanium is 5-20 wt%, the content of vanadium is 5-10 wt%, the content of molybdenum is 10-25 wt%, the content of chromium is 5-15 wt%, the content of nickel is 2-6 wt%, and the content of carbon is 2-6 wt%.

[0007] Preferably, the powder also contains iron.

[0008] More preferably, the iron content is 35-50 wt% based on the total mass of the powder.

[0009] A second aspect of the present invention provides an alloy material for a wear-resistant layer of spectacle plates, the alloy material being prepared from the powder described in the first aspect; The alloy material contains a hard reinforcing phase and a matrix element; the hard reinforcing phase includes MC-type carbides formed by tungsten, titanium, vanadium and carbon, M2C-type carbides formed by molybdenum and carbon, and M7C3-type carbides formed by chromium and carbon.

[0010] Preferably, the matrix elements include iron and nickel.

[0011] A third aspect of the present invention provides a spectacle plate, the spectacle plate comprising: A. The base has two symmetrically arranged through holes and a sealing area on one end face; B. Wear-resistant layer, comprising alloy material disposed on the inner surface of the through hole and the sealing area; The alloy material is the alloy material described in the second aspect of this invention.

[0012] Preferably, the wear-resistant layer includes segment a, segment b, segment c, and segment d; segment a is disposed at the junction of the upper end of the through hole and the sealing area; segment b is disposed on the inner wall of the through hole; segment c is disposed in the sealing area and arranged around the outer periphery of the through hole; and segment d is disposed between the two annular segments c in the sealing area.

[0013] Preferably, the length of segment a is greater than 10 mm and the thickness is greater than 4 mm.

[0014] Preferably, the thickness of segment b is 1.5-3 mm.

[0015] Preferably, the width of segment c is ≥20mm and the thickness is ≥5mm.

[0016] Preferably, the thickness of segment d is 1.5-3 mm.

[0017] A fourth aspect of the present invention provides a method for preparing the spectacle plate described in the third aspect, the method comprising: (1) Cutting and blanking make the spectacle plate blank form the outer contour of the spectacle plate and two symmetrical through holes to obtain the spectacle plate substrate; (2) The spectacle plate substrate is processed. According to the length requirements of section a and section b and the thickness requirements of the wear-resistant layer, the inner diameter of the through hole is processed to the required size. According to the thickness requirements of the wear-resistant layer of section c and section d, a countersunk platform is processed in the sealing area of ​​the spectacle plate substrate. (3) The composite powder is welded to the inner surface of the through hole and the sealing area of ​​the spectacle plate substrate by laser cladding to form a wear-resistant layer; The composite powder is the powder described in the first aspect of this invention.

[0018] More preferably, the welding method is laser cladding, and the conditions for laser cladding include: laser cladding power of 2-5kW, laser scanning line speed of 5-20mm / s, powder feeding rate of 2-10g / min, cladding overlap rate of 30%-50%, and single-layer cladding thickness of 0.5-1mm.

[0019] The fifth aspect of the invention provides the application of the spectacle plate described in the fourth aspect in concrete pumping equipment.

[0020] Through the above technical solution, the present invention has at least the following advantages: (1) The wear-resistant layer of the spectacle plate provided by this solution uses tungsten, titanium, vanadium, molybdenum and chromium elements to form a hard reinforcing phase with carbon elements, providing hardness and wear resistance. While obtaining a hardness comparable to that of the existing tungsten carbide hard alloy wear-resistant layer, it can significantly reduce the amount of tungsten elements used, resulting in a wear-resistant layer with lower density and lower cost.

[0021] (2) The wear-resistant layer of the through hole inner surface and the sealing area of ​​the spectacle plate provided by this solution is made of the same alloy material, which can balance the huge difference in wear resistance between the existing spectacle plate through hole inner surface and the sealing area wear-resistant layer; at the same time, the structure of the wear-resistant layer is optimized, and the sections a and c that are most severely impacted by the cutting ring are strengthened, and the wear-resistant layer of the sealing area is extended to be flush with the wear-resistant layer at the through hole, which effectively increases the area of ​​the sealing area around the through hole, making the overall wear-resistant layer of the spectacle plate more balanced.

[0022] (3) The preparation method of the spectacle plate provided in this solution is to clad and weld the composite powder onto the surface of the spectacle plate substrate by laser or plasma heating to form a wear-resistant layer. Since it is the same material and the same welding process, the welding and fixing of the inner surface of the through hole and the sealing area can be completed in one process. Compared with the prior art, the welding and fixing efficiency of the wear-resistant layer is greatly improved. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the spectacle plate provided by the present invention; Figure 2 yes Figure 1 Schematic diagram of cross section along line AA. Detailed Implementation

[0024] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0025] As mentioned above, a first aspect of the present invention provides a powder containing metallic elements, wherein the powder contains tungsten, titanium, vanadium, molybdenum, chromium, nickel and carbon. Based on the total mass of the powder, the content of tungsten is 2-5 wt%, the content of titanium is 5-20 wt%, the content of vanadium is 5-10 wt%, the content of molybdenum is 10-25 wt%, the content of chromium is 5-15 wt%, the content of nickel is 2-6 wt%, and the content of carbon is 2-6 wt%.

[0026] Preferably, the powder also contains iron.

[0027] More preferably, the iron content is 35-50 wt% based on the total mass of the powder.

[0028] As previously described, a second aspect of the present invention provides an alloy material for a wear-resistant layer of a spectacle plate, the alloy material being prepared from the powder described in the first aspect; The alloy material contains a hard reinforcing phase and a matrix element; the hard reinforcing phase includes MC-type carbides formed by tungsten, titanium, vanadium and carbon, M2C-type carbides formed by molybdenum and carbon, and M7C3-type carbides formed by chromium and carbon.

[0029] Preferably, the matrix elements include iron and nickel.

[0030] The alloy material provided by this invention provides hardness and wear resistance through the hard reinforcing phase, while the matrix elements provide toughness and strength. The reinforcing phases, formed by different types of carbides, are dispersed and embedded in the iron-nickel matrix, and through synergistic action, together form the hard skeleton of the alloy material, exhibiting excellent wear resistance. During spectacle plate manufacturing, it effectively resists the erosion and wear of concrete and gravel. Simultaneously, the excellent toughness of the iron-nickel matrix prevents the wear-resistant layer from easily chipping or detaching.

[0031] As previously described, a third aspect of the present invention provides a spectacle plate comprising: A. The base has two symmetrically arranged through holes and a sealing area on one end face; B. Wear-resistant layer, comprising alloy material disposed on the inner surface of the through hole and the sealing area; The alloy material is the alloy material described in the second aspect of this invention.

[0032] In this invention, one end face of the substrate is a sealing surface and the other end face is an assembly surface; during pumping, the cutting ring at the end of the S-tube swings and alternately aligns with the two through holes to transport materials. During this process, the area covered by the movement trajectory of the cutting ring on the sealing surface is the sealing area.

[0033] Preferably, the substrate is made of carbon steel, the carbon steel having a carbon content of 0.1-0.4 wt% and a manganese content of 0.5-2 wt%; the carbon steel is selected from at least one of Q235 carbon steel, Q345 carbon steel, and 35 carbon steel.

[0034] Preferably, the wear-resistant layer includes segment a, segment b, segment c, and segment d; segment a is disposed at the junction of the upper end of the through hole and the sealing area; segment b is disposed on the inner wall of the through hole; segment c is disposed in the sealing area and arranged around the outer periphery of the through hole; and segment d is disposed between the two annular segments c in the sealing area.

[0035] Preferably, the length of segment a is greater than 10 mm and the thickness is greater than 4 mm.

[0036] Preferably, the thickness of segment b is 1.5-3 mm.

[0037] Preferably, the width of segment c is ≥20mm and the thickness is ≥5mm.

[0038] Preferably, the thickness of segment d is 1.5-3 mm.

[0039] As previously described, a fourth aspect of the present invention provides a method for preparing the spectacle plate described in the third aspect, the method comprising: (1) Cutting and blanking make the spectacle plate blank form the outer contour of the spectacle plate and two symmetrical through holes to obtain the spectacle plate substrate; (2) The spectacle plate substrate is processed. According to the length requirements of section a and section b and the thickness requirements of the wear-resistant layer, the inner diameter of the through hole is processed to the required size. According to the thickness requirements of the wear-resistant layer of section c and section d, a countersunk platform is processed in the sealing area of ​​the spectacle plate substrate. (3) The composite powder is welded to the inner surface of the through hole and the sealing area of ​​the spectacle plate substrate by laser cladding or plasma heating cladding to form a wear-resistant layer; The composite powder is the powder described in the first aspect of this invention.

[0040] Preferably, the thickness of the spectacle plate substrate is 30-50 mm.

[0041] More preferably, the welding method is laser cladding, and the conditions for laser cladding include: laser cladding power of 2-5kW, laser scanning line speed of 5-20mm / s, powder feeding rate of 2-10g / min, cladding overlap rate of 30%-50%, and single-layer cladding thickness of 0.5-1mm.

[0042] In a preferred embodiment, step (2) further includes: when cladding the inner surface of the through hole, first cladding section a until it is flush with the inner diameter of section b, and then cladding sections a and b simultaneously to the required size according to the design requirements; when cladding the sealing area, first cladding section c until it is flush with the height of the countersunk platform of section d, and then cladding sections c and d simultaneously to the required size according to the design requirements.

[0043] Preferably, the entire spectacle plate undergoes post-processing: first, the two sides of the spectacle plate are finely ground on a surface grinder to the required thickness and flatness according to the design requirements, and then all the machining of the bolt holes, dovetail grooves, sealing grooves and other structures of the spectacle plate is completed.

[0044] As previously stated, the fifth aspect of the present invention provides the application of the spectacle plate described in the fourth aspect in concrete pumping equipment.

[0045] The present invention will be described in detail below through embodiments. Unless otherwise specified, all raw materials used in the following embodiments are commercially available products.

[0046] Q235 carbon steel: carbon content is 0.2wt%, manganese content is 1wt%, purchased from Hunan Valin Steel Group Co., Ltd.

[0047] Example 1 (1) The spectacle plate blank is formed by flame cutting to create an outline and two symmetrical through holes, so as to obtain the spectacle plate substrate; the thickness of the spectacle plate substrate is 40mm. (2) The inner diameter of sections a and b on the inner surface of the through hole is machined by a milling machine to form a stepped through hole, wherein the radius of section a is 2.5 mm larger than that of section b and the length of section a is 15 mm; a stepped countersunk is machined in sections c and d of the sealing area, wherein the countersunk in section c is 2.5 mm deeper than that in section d. (3) The spectacle plate substrate obtained in step (2) is installed on the worktable, and the composite powder is welded to the inner surface of the through hole and the sealing area by laser cladding to form a wear-resistant layer; the laser cladding power is 3kW, the laser scanning linear speed is 15mm / s, the powder feeding rate is 5g / min, the cladding overlap rate is 35%, and the single-layer cladding thickness is 0.5mm. When cladding the inner surface of the through hole, section a is first clad with a thickness of 2.5mm until it is flush with section b, and then sections a and b are clad with a thickness of 2.5mm at the same time; when cladding the sealing area, section c is first clad with a thickness of 2.5mm until it is flush with the countersunk section d, and then sections c and d are clad with a thickness of 2.5mm at the same time.

[0048] like Figure 2 As shown, the wear-resistant layer of the spectacle plate obtained in this embodiment includes segments a, b, c, and d. Specifically, segment a is located at the junction of the upper end of the through hole and the sealing area; segment b is located on the inner wall of the through hole; segment c is located in the sealing area and surrounds the outer periphery of the through hole; and segment d is located between the two annular segments c in the sealing area. Segment a has a length of 15 mm and a thickness of 5 mm; segment b has a thickness of 2.5 mm; segment c has a width of 20 mm and a thickness of 5 mm; and segment d has a thickness of 2.5 mm.

[0049] (4) Post-processing: First, according to the design requirements, the two sides of the spectacle plate are finely ground on a surface grinder to the required thickness and flatness. Then, all the processing of the bolt holes, dovetail grooves, sealing grooves and other structures of the spectacle plate is completed.

[0050] In the composite powder used in this embodiment, the content of tungsten is 3wt%, the content of titanium is 18wt%, the content of vanadium is 10wt%, the content of molybdenum is 15wt%, the content of chromium is 8wt%, the content of nickel is 3wt%, the content of carbon is 5wt%, and the content of iron is 38wt%.

[0051] The spectacle plate of this embodiment has been industrially tested and found to be used in pumped concrete in different material conditions in China, with a capacity of 50,000 to 80,000 cubic meters.

[0052] In this invention, the industrial assessment refers to: mounting a spectacle plate on a concrete pump truck and pumping concrete, recording the volume of concrete pumped onto the truck when the spectacle plate was loaded and the volume of concrete pumped onto the truck when the seal failed, as recorded on the industrial internet. The calculation formula is: the volume of concrete pumped onto the truck when the spectacle plate was used = the volume of concrete pumped onto the truck when the seal failed - the volume of concrete pumped onto the truck when the spectacle plate was loaded. Tests were conducted with five concrete pump trucks in both low-grade and conventional material areas in China to obtain the range of volumes of concrete pumped onto the spectacle plate used. In the low-grade material areas, the concrete aggregate was hard and mostly consisted of angular sand and gravel, resulting in higher wear on the wear-resistant layer of the spectacle plate. In the conventional material areas, the aggregate had lower hardness and a more regular shape, resulting in lower wear on the wear-resistant layer of the spectacle plate.

[0053] Example 2 This embodiment uses the same process as Example 1. The difference is that the composite powder used in this embodiment contains 2.5 wt% tungsten, 15 wt% titanium, 8 wt% vanadium, 18 wt% molybdenum, 5 wt% chromium, 2.5 wt% nickel, 4 wt% carbon, and 45 wt% iron.

[0054] The remaining process parameters are the same as in Example 1.

[0055] The spectacle plate of this embodiment has been industrially tested and found to be used in pumped concrete in different material conditions in China, with a capacity of 40,000 to 70,000 cubic meters.

[0056] Example 3 This embodiment uses the same process as Example 1. The difference is that the composite powder used in this embodiment contains 4 wt% tungsten, 5 wt% titanium, 5 wt% vanadium, 20 wt% molybdenum, 10 wt% chromium, 4 wt% nickel, 3.6 wt% carbon, and 48.4 wt% iron.

[0057] The remaining process parameters are the same as in Example 1.

[0058] The spectacle plate of this embodiment has been industrially tested and found to be used in pumped concrete in different material conditions in China, with a capacity of 40,000 to 70,000 cubic meters.

[0059] Example 4 This embodiment uses the same process as Embodiment 1. The difference is that the wear-resistant layer of the spectacle plate obtained in this embodiment has a length of 15mm and a thickness of 2.5mm for section a, a thickness of 2.5mm for section b, a width of 20mm and a thickness of 2.5mm for section c, and a thickness of 2.5mm for section d.

[0060] The remaining process parameters are the same as in Example 1.

[0061] Because the wear-resistant layer thickness in key areas is thinner than that in the same position of the spectacle plate in Example 1, the spectacle plate of this example has been tested in industrial applications and its usage in pumped concrete in different material conditions in China is 30,000 to 60,000 cubic meters.

[0062] Example 5 This embodiment uses the same process as Example 1. The difference is that the composite powder used in this embodiment contains 2wt% tungsten, 5wt% titanium, 5wt% vanadium, 10wt% molybdenum, 5wt% chromium, 2wt% nickel, 4wt% carbon, and 67wt% iron.

[0063] The remaining process parameters are the same as in Example 1.

[0064] Due to the high content of matrix elements and the low proportion of hard phase carbides, the wear resistance is relatively weak. The spectacle plate of this embodiment has been industrially tested and its usage in pumped concrete in different material conditions across China ranges from 28,000 to 48,000 cubic meters.

[0065] Comparative Example 1 This comparative example uses the same process as Example 1. The difference is that the composite powder used in this comparative example contains 4 wt% tungsten, 19 wt% titanium, 10 wt% vanadium, 17 wt% molybdenum, 9 wt% chromium, 4 wt% nickel, 1.5 wt% carbon, and 35.5 wt% iron.

[0066] The remaining process parameters are the same as in Example 1.

[0067] In this embodiment, due to the low carbon content, the alloy cannot form a sufficient number of hard carbides, resulting in insufficient wear resistance. The spectacle plate of this embodiment, after industrial testing, has a usage volume of 20,000-38,000 cubic meters in pumped concrete across different material conditions in China.

[0068] Comparative Example 2 This comparative example uses the same process as Example 1. The difference is that the composite powder used in this comparative example contains 2 wt% tungsten, 17 wt% titanium, 9 wt% vanadium, 14 wt% molybdenum, 8 wt% chromium, 3 wt% nickel, 8 wt% carbon, and 39 wt% iron.

[0069] The remaining process parameters are the same as in Example 1.

[0070] In this embodiment, the high carbon content leads to the precipitation of eutectic carbides or free graphite at the grain boundaries or within the alloy, making the material brittle and resulting in lower strength and impact toughness. The spectacle plate of this embodiment has been industrially tested and found to be suitable for pumping 20,000-40,000 cubic meters of concrete in various material conditions across China.

[0071] Test case The performance test data of the wear-resistant layer of the spectacle plates in the embodiments and comparative examples are shown in Table 1.

[0072] In Table 1, the sealing area of ​​the existing spectacle plate is a tungsten carbide hard alloy wear-resistant layer, and the inner surface of the through hole is a high-chromium wear-resistant layer.

[0073] The average mass wear (m) was measured using a wet sand rubber wheel abrasion tester (MLS-225). Test specimens of 57mm × 25.5mm × 6mm were prepared from the wear-resistant layers of the spectacle plate in the example, the comparative spectacle plate, and the wear-resistant layers of the sealed area and through-hole surface of the hard alloy spectacle plate. The mass of the test specimens before and after the wear test was measured, and the difference between the two measurements was taken as the mass wear. The average of the five sets of mass wear was taken as the average mass wear (m). The wear test conditions were as follows: the wear medium was 1.5kg of quartz sand (average particle size 200-380μm) and 1L of water; the normal load was 170±3N; the diameter of the rubber wheel was 178mm, the rotation speed was 240rpm, and the friction stroke was 5000r.

[0074] Density (ρ) was determined using Archimedes' method of water displacement.

[0075] The formula for calculating average volumetric wear (V) is: V = m / ρ.

[0076] Table 1. Abrasion resistance test data of the abrasion-resistant layer of the spectacle plate.

[0077] The results above show that the spectacle plate provided by the present invention has a service life comparable to that of existing spectacle plates. Although the wear resistance of the wear-resistant layer of the spectacle plate provided by the present invention is slightly lower than that of the tungsten carbide hard alloy wear-resistant layer, it is significantly higher than that of the high chromium wear-resistant layer, balancing the significant difference in wear resistance between the through holes and sealing areas of existing spectacle plates, making the overall wear-resistant layer of the spectacle plate more balanced. At the same time, the wear-resistant layer has a lower density, and the wear-resistant layer of the same thickness is lighter.

[0078] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A powder containing a metallic element, characterized in that, The powder contains tungsten, titanium, vanadium, molybdenum, chromium, nickel, and carbon. Based on the total mass of the powder, the content of tungsten is 2-5 wt%, the content of titanium is 5-20 wt%, the content of vanadium is 5-10 wt%, the content of molybdenum is 10-25 wt%, the content of chromium is 5-15 wt%, the content of nickel is 2-6 wt%, and the content of carbon is 2-6 wt%.

2. The powder according to claim 1, characterized in that, The powder also contains iron. And / or, based on the total mass of the powder, the iron content is 35-50 wt%.

3. An alloy material for the wear-resistant layer of spectacle plates, characterized in that, The alloy material is prepared from the powder described in claim 1 or 2; The alloy material contains a hard reinforcing phase and a matrix element; the hard reinforcing phase includes MC-type carbides formed by tungsten, titanium, vanadium and carbon, M2C-type carbides formed by molybdenum and carbon, and M7C3-type carbides formed by chromium and carbon.

4. The alloy material according to claim 3, characterized in that, The matrix elements include iron and nickel.

5. A spectacle plate, characterized in that, The spectacle plate includes: A. The base has two symmetrically arranged through holes and a sealing area on one end face; B. Wear-resistant layer, comprising alloy material disposed on the inner surface of the through hole and the sealing area; The alloy material is the alloy material described in claim 3 or 4.

6. The spectacle plate according to claim 5, characterized in that, The wear-resistant layer includes segment a, segment b, segment c, and segment d; segment a is disposed at the upper end of the through hole where it connects with the sealing area; segment b is disposed on the inner wall of the through hole; segment c is disposed in the sealing area and arranged around the outer periphery of the through hole; and segment d is disposed between the two annular segments c in the sealing area.

7. The spectacle plate according to claim 6, characterized in that, The length of segment a is greater than 10mm and the thickness is greater than 4mm; And / or, the thickness of segment b is 1.5-3 mm; And / or, the width of segment c is ≥20mm and the thickness is ≥5mm; And / or, the thickness of the d segment is 1.5-3 mm.

8. A method for preparing the spectacle plate according to any one of claims 5-7, characterized in that, The method includes: (1) Cutting and blanking make the spectacle plate blank form the outer contour of the spectacle plate and two symmetrical through holes to obtain the spectacle plate substrate; (2) The spectacle plate substrate is processed. According to the length requirements of section a and section b and the thickness requirements of the wear-resistant layer, the inner diameter of the through hole is processed to the required size. According to the thickness requirements of the wear-resistant layer of section c and section d, a countersunk platform is processed in the sealing area of ​​the spectacle plate substrate. (3) The composite powder is welded to the inner surface of the through hole and the sealing area of ​​the spectacle plate substrate by laser cladding to form a wear-resistant layer; The composite powder is the powder described in claim 1 or 2.

9. The method according to claim 8, characterized in that, The welding method is laser cladding, and the conditions for laser cladding include: laser cladding power of 2-5kW, laser scanning line speed of 5-20mm / s, powder feeding rate of 2-10g / min, cladding overlap rate of 30%-50%, and single-layer cladding thickness of 0.5-1mm.

10. The application of the spectacle plate according to any one of claims 5-7 in a concrete pumping equipment.

Images