High-wear-resistance alloy material and throat-shaped nozzle using same

Abstract

The invention relates to the technical field of alloy materials, in particular to a high-wear-resistance alloy material and a throat-shaped nozzle applying the same. The preparation method comprises the following steps: compounding WC powder, Co powder, Cu powder and Cr3C2 powder to prepare a mixture; the preparation method comprises the following steps: uniformly mixing sulfydryl-containing organic silicon, epoxy organic silicon modified polyester and xylene to obtain a modifier, and modifying the mixture to obtain a mixture A; 3-aminopropyltrimethoxysilane is used for carrying out surface modification on the mixed material, and a mixed material B is prepared; carrying out mixing, granulation and injection molding on the mixture A, the mixture B and a binder to obtain a green body; and degreasing the green body, and sintering and molding to obtain the high-wear-resistance alloy material. The prepared high-wear-resistance alloy material has excellent mechanical properties and wear resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of alloy materials, and particularly to a throat nozzle made of a highly wear-resistant alloy material and its application. Background Art

[0002] With the continuous progress of industrial technology and the increasing demand for high-performance materials, the application of nozzles in many high-temperature, high-pressure, and corrosive environments has become increasingly widespread. As an important component in fluid dynamics, throat nozzles are widely used in fields such as aerospace, chemical engineering, and gas turbines. To meet the high requirements for material properties in these applications, researchers have begun to focus on the development and application of highly wear-resistant alloy materials.

[0003] However, traditional nozzle materials are often prone to wear, deformation, and fatigue in high-temperature and high-pressure environments, resulting in a significant reduction in the service life of the nozzles. This not only increases the maintenance cost but also affects the efficiency and safety of the entire system. In terms of materials, the binders (such as Ni) used in many nozzle alloys may cause an increase in the brittleness of the materials under certain conditions, reducing the overall mechanical properties of the nozzles, especially under impact or fatigue loads; in addition, poor compatibility between different material components will cause the separation of mixed metal powders during the forming and sintering processes, thus affecting the density and properties of the materials.

[0004] Therefore, we propose a throat nozzle made of a highly wear-resistant alloy material and its application. Summary of the Invention

[0005] To reduce the waste of transfer metal foils in the current composite current collector transfer welding process, the present invention proposes a welding method that only requires welding the metal foil on one side. Compared with welding the metal foil on both sides, this welding process is more convenient, and compared with transfer welding without using metal foils, the overcurrent resistance is lower.

[0006] To achieve the above-mentioned invention purpose, the present invention provides the following technical solutions: A preparation method of a highly wear-resistant alloy material, comprising the following steps: Step S1: Put WC powder, Co powder, Cu powder, Cr3C2 powder, and absolute ethanol into a wet mill for ball milling, take out, and after drying, obtain a mixture; Step S2: Mix mercapto-organosilane, epoxy-organosilane modified polyester, and xylene evenly to obtain a modifier; mix the mixture and the modifier, disperse ultrasonically for 30 - 50 min, stir at 120 - 130 °C for 1 - 2 h, and after filtration, washing, and drying, obtain mixture A; Step S3: Ultrasonically disperse the mixture in a mixed solution of anhydrous ethanol, deionized water and 3-aminopropyltrimethoxysilane, react at 70 - 80 °C for 1 - 3 h, and after centrifugation, washing and drying, obtain mixture B; Step S4: Mix mixture A, mixture B and the binder through kneading and granulation to obtain a feedstock; inject the feedstock to form a green body; degrease the green body and then sinter it to form a high wear-resistant alloy material.

[0007] Further, in the step S1, the mixture comprises the following components in mass percentage: Co: 3 - 6%, Cu: 1 - 2%, Cr3C2: 2 - 4%, and the balance is WC.

[0008] Further, in the step S1, the addition amount of anhydrous ethanol is 15 - 25% of the total mass of WC powder, Co powder, Cu powder and Cr3C2 powder.

[0009] Further, in the step S1, the process conditions of ball milling are: the ball-to-material ratio is 3 - 5:1, the ball milling speed is 45 - 55 r / min, and the ball milling time is 35 - 45 h.

[0010] Further, in the step S2, the mass ratio of the mercapto-functionalized silicone, epoxy-functionalized silicone-modified polyester and xylene is 1:(4 - 5):(10 - 12).

[0011] Further, in the step S2, the mass ratio of the mixture and the modifier is 1:(10 - 12).

[0012] Further, the preparation method of the mercapto-functionalized silicone is as follows: Under nitrogen protection, mix 3-mercaptopropylmethyldimethoxysilane, deionized water and isopropanol evenly, heat up to 60 - 70 °C, add hydroxyl silicone oil and tetramethylammonium hydroxide and mix evenly, react for 4 - 6 h, and obtain the mercapto-functionalized silicone through vacuum distillation.

[0013] Further, the mass ratio of 3-mercaptopropylmethyldimethoxysilane, deionized water, isopropanol, hydroxyl silicone oil and tetramethylammonium hydroxide is 1:(2 - 3):(7 - 8):(65 - 66):(1.2 - 1.4).

[0014] Further, the preparation method of the epoxy-functionalized silicone-modified polyester is as follows: Step A: Under nitrogen protection, mix hydroxyl silicone oil, 3-glycidoxypropylmethyldiethoxysilane and tetramethylammonium hydroxide silanolate evenly, react at 90 - 100 °C for 5 - 7 h, and obtain the epoxy-functionalized silicone through vacuum distillation; Step B: Under nitrogen protection, uniformly mix epoxy group-containing organosilicon and dihydroxy-terminated unsaturated polyester, react at 140 - 160 °C for 3 - 5 h, then add dibutyltin dilaurate, raise the temperature to 170 - 180 °C, and react until no water is produced to obtain epoxy group-containing organosilicon modified polyester.

[0015] In the above technical solution, epoxy group-containing organosilicon was prepared by the condensation reaction of 3-glycidoxypropylmethyldiethoxysilane and low-viscosity hydroxyl silicone oil; then, epoxy group-containing organosilicon modified polyester was obtained by the condensation reaction of epoxy group-containing organosilicon and dihydroxy-terminated unsaturated polyester.

[0016] Further, in the step A, the mass ratio of hydroxyl silicone oil to 3-glycidoxypropylmethyldiethoxysilane is 1:(0.05 - 0.10).

[0017] Further, the dosage of tetramethylammonium hydroxide silanolate is 0.015 - 0.022% of the total mass of hydroxyl silicone oil and 3-glycidoxypropylmethyldiethoxysilane.

[0018] Further, in the step B, the mass ratio of epoxy group-containing organosilicon, dihydroxy-terminated unsaturated polyester, and dibutyltin dilaurate is 1:(4 - 6):(0.03 - 0.05).

[0019] Further, the dihydroxy-terminated unsaturated polyester is one or both of hydroxyl-terminated poly(maleic acid glycol ester) and hydroxyl-terminated poly(itaconic acid glycol ester), and the molecular weight is 1000 - 4000 g / mol.

[0020] Further, in the step S3, the mass ratio of the mixture, absolute ethanol, deionized water, and 3-aminopropyltrimethoxysilane is 1:(10 - 12):(2 - 4):(0.1 - 0.3).

[0021] Further, in the step S4, the dosages of each component are as follows: by mass percentage, 15 - 20 wt% of mixture A, 35 - 45 wt% of mixture B, and the rest is the binder.

[0022] Further, the binder includes the following components by mass percentage: ethylene-vinyl acetate copolymer 10 - 20 wt%, high-density polyethylene 10 - 20 wt%, poly(lactic acid) 5 - 10 wt%, stearic acid 3 - 5%, and the rest is paraffin.

[0023] Further, the process conditions for mixing are: the mixing temperature is 150 - 160 °C, and the mixing time is 1 - 2 h.

[0024] Further, the process conditions for injection molding are as follows: the injection temperature is 140 - 160 °C, the injection pressure is 80 - 120 MPa, the injection speed is 40 - 100 g / s, and the mold temperature is 30 - 50 °C.

[0025] Further, the debinding includes solvent debinding and thermal debinding; the solvent debinding process is as follows: the solvent is n - heptane, the debinding time is 6 - 8 h, and the temperature is 40 - 60 °C; the thermal debinding process is as follows: the thermal debinding temperature is 600 - 800 °C, and the thermal debinding time is 30 - 60 min.

[0026] Further, the process conditions for sintering and forming are as follows: under the protection of a nitrogen atmosphere, it is heated to 1450 - 1500 °C at a heating rate of 5 - 10 °C / min, and the sintering time is 12 - 16 h.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: A throat - type nozzle made of a high - wear - resistant alloy material and its application according to the present invention is prepared by compounding WC powder, Co powder, Cu powder, and Cr3C2 powder to obtain a mixture. Among them, WC powder serves as the hard phase, providing the high hardness and wear resistance of the material; Co powder melts and wets WC particles during sintering, forming a continuous metal network, enhancing the bonding strength between particles, and improving the impact resistance and toughness of the material; Cu powder fills the pores, improving the density of the material; Cr3C2 powder plays a role in refining the grains, improving the material uniformity, and significantly enhancing the wear resistance and corrosion resistance of the alloy. The paraffin - based binder system is selected, and ethylene - vinyl acetate copolymer, high - density polyethylene, poly(lactic acid), stearic acid, and paraffin are compounded as the binder, and finally a high - wear - resistant alloy material with excellent comprehensive performance can be obtained.

[0028] On this basis, the present application conducts surface modification on the mixture. First, the mixture is modified with mercapto - containing organosilicon and epoxy - containing organosilicon - modified polyester as modifiers to obtain mixture A. Among them, epoxy - containing organosilicon - modified polyester contains epoxy groups and unsaturated double bonds. The introduction of unsaturated double bonds can effectively improve the compatibility between the compounded powder and the binder. The mercapto groups in mercapto - containing organosilicon can interact with metal powders, enhancing the interfacial bonding force, reducing particle agglomeration, and improving the modification effect. Then, the mixture is modified with 3 - aminopropyltrimethoxysilane to obtain mixture B, and amino groups are grafted on its surface. By using the reaction between amino groups and epoxy groups, mixture A and mixture B are combined more tightly, reducing the porosity. The binder can coat the raw material powder surface more uniformly, ensuring the formability during the production process, reducing the porosity, improving the density of the finished product, and enabling the final alloy material to exhibit better mechanical properties in applications. Description of the Drawings

[0029] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the throat nozzle in the present invention. Specific embodiments

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0031] It should be noted that there are no special restrictions on the purchasing manufacturers of all raw materials involved in the present invention. Exemplarily, they include: WC powder: particle size of 5 - 10 μm, carbon content of 6.08 - 6.18%; Co powder: pure cobalt powder, particle size of 3 - 5 μm; Cu powder: pure copper powder, particle size of 1 - 2 μm; Cr3C2 powder: particle size of 1 - 2 μm, purity of 99.9%; hydroxy silicone oil: model 768543, sourced from Shanghai Macklin.

[0032] In this embodiment, the dihydroxy - terminated unsaturated polyester is hydroxy - terminated poly(butylene itaconate) (PBI), and its specific preparation steps refer to the prior art (Wang Yingying. Synthesis and Characterization of Poly(butylene itaconate) [D]. Shandong: Qingdao University of Science and Technology, 2013. DOI: 10.7666 / d.J0106011.).

[0033] Unless otherwise specified, the following parts are by mass.

[0034] Example 1: A preparation process of a high - wear - resistant alloy material, comprising the following steps: Step S1: Put WC powder, Co powder, Cu powder, Cr3C2 powder and absolute ethanol into a wet mill for ball milling (ball - to - material ratio is 3:1, ball - milling speed is 45 r / min, ball - milling time is 35 h), take out, dry, and obtain a mixture; the mixture includes the following components by mass percentage: Co: 3%, Cu: 1%, Cr3C2: 1%, and the balance is WC; the addition amount of absolute ethanol is 15% of the total mass of WC powder, Co powder, Cu powder, and Cr3C2 powder; Step S2: Mix 10 parts of mercapto - containing silicone, 40 parts of epoxy - modified polyester and 100 parts of xylene evenly to obtain a modifier; mix 15 parts of the mixture and 150 parts of the modifier, ultrasonically disperse for 30 min, stir at 120 °C for 1 h, and after filtration, washing, and drying, obtain mixture A; Step S3: Ultrasonically disperse 35 parts of the mixture in a mixed solution of 350 parts of absolute ethanol, 70 parts of deionized water, and 3.5 parts of 3-aminopropyltrimethoxysilane, react at 70 °C for 1 h, and after centrifugation, washing, and drying, obtain mixture B; Step S4: Mix mixture A, mixture B, and the binder through kneading (kneading temperature is 150 °C, kneading time is 1 h), granulate to obtain the feed; inject the feed (injection temperature is 140 °C, injection pressure is 80 MPa, injection speed is 40 g / s, mold temperature is 30 °C) to obtain the green body; degrease the green body (including solvent degreasing and thermal degreasing; the solvent degreasing process is: the solvent is n-heptane, degreasing time is 6 h, temperature is 40 °C; the thermal degreasing process is: thermal degreasing temperature is 600 °C, thermal degreasing time is 30 min), and then sinter and form (under the protection of a nitrogen atmosphere, heat at a heating rate of 5 °C / min to 1450 °C, sintering time is 16 h) to obtain the high wear-resistant alloy material; by mass percentage, 15 wt% mixture A, 35 wt% mixture B, and the rest is the binder; the binder includes the following components by mass percentage: ethylene-vinyl acetate copolymer 10 wt%, high-density polyethylene 10 wt%, poly(lactic acid) 5 wt%, stearic acid 3%, and the rest is paraffin; The preparation method of the mercapto-containing organosilicon is as follows: Under nitrogen protection, mix 0.2 parts of 3-mercaptopropylmethyldimethoxysilane, 0.4 parts of deionized water, and 1.4 parts of isopropanol evenly, heat up to 60 °C, add 13 parts of hydroxyl silicone oil and 0.24 parts of tetramethylammonium hydroxide and mix evenly, react for 4 h, and obtain the mercapto-containing organosilicon through vacuum distillation; The preparation method of the epoxy group-containing organosilicon-modified polyester is as follows: Step A: Under nitrogen protection, mix 40 parts of hydroxyl silicone oil, 2 parts of 3-glycidoxypropylmethyldiethoxysilane, and tetramethylammonium hydroxide silanolate evenly, react at 90 °C for 5 h, and obtain the epoxy group-containing organosilicon through vacuum distillation; the dosage of tetramethylammonium hydroxide silanolate is 0.015% of the total mass of hydroxyl silicone oil and 3-glycidoxypropylmethyldiethoxysilane; Step B: Under nitrogen protection, mix 40 parts of the epoxy group-containing organosilicon and 160 parts of the dihydroxy-terminated unsaturated polyester evenly, react at 140 °C for 3 h, then add 1.2 parts of dibutyltin dilaurate, heat up to 170 °C, and react until no water is produced to obtain the epoxy group-containing organosilicon-modified polyester.

[0035] Example 2: A preparation process of a high wear-resistant alloy material, including the following steps: Step S1: Put WC powder, Co powder, Cu powder, Cr3C2 powder and absolute ethanol into a wet mill and carry out ball milling (the ball-to-material ratio is 4:1, the ball milling speed is 50 r / min, and the ball milling time is 40 h). Take it out, dry it, and obtain a mixture. The mixture includes the following components by mass percentage: Co: 5%, Cu: 1.5%, Cr3C2: 2%, and the balance is WC. The addition amount of absolute ethanol is 20% of the total mass of WC powder, Co powder, Cu powder, and Cr3C2 powder. Step S2: Mix 12 parts of mercapto-containing organosilicon, 54 parts of epoxy-group-containing organosilicon-modified polyester and 132 parts of xylene evenly to obtain a modifier. Mix 18 parts of the mixture and 198 parts of the modifier, ultrasonically disperse for 40 min, stir at 125 °C for 1.5 h, and after filtration, washing and drying, obtain mixture A. Step S3: Ultrasonically disperse 40 parts of the mixture in a mixed solution of 440 parts of absolute ethanol, 120 parts of deionized water and 8 parts of 3-aminopropyltrimethoxysilane, react at 75 °C for 2 h, and after centrifugation, washing and drying, obtain mixture B. Step S4: Mix mixture A, mixture B and a binder through kneading (the kneading temperature is 155 °C and the kneading time is 1.5 h), granulate to obtain a feed. Inject the feed (the injection temperature is 145 °C, the injection pressure is 100 MPa, the injection speed is 60 g / s, and the mold temperature is 40 °C) to obtain a green body. Carry out debinding on the green body (including solvent debinding and thermal debinding; the solvent debinding process is: the solvent is n-heptane, the debinding time is 7 h, and the temperature is 50 °C; the thermal debinding process is: the thermal debinding temperature is 700 °C and the thermal debinding time is 50 min), and then sinter and form (under the protection of a nitrogen atmosphere, heat to 1480 °C at a heating rate of 8 °C / min, and the sintering time is 14 h) to obtain a high wear-resistant alloy material. By mass percentage, it is 18 wt% of mixture A, 40 wt% of mixture B, and the rest is the binder. The binder includes the following components by mass percentage: ethylene-vinyl acetate copolymer 15 wt%, high-density polyethylene 15 wt%, poly(lactic acid) 8 wt%, stearic acid 4%, and the rest is paraffin. The preparation method of mercapto-containing organosilicon is as follows: Under nitrogen protection, mix 0.2 part of 3-mercaptopropylmethyldimethoxysilane, 0.5 part of deionized water and 1.5 parts of isopropanol evenly, heat up to 65 °C, add 13 parts of hydroxy silicone oil and 0.26 part of tetramethylammonium hydroxide silanolate and mix evenly, react for 5 h, and obtain mercapto-containing organosilicon through vacuum distillation. The preparation method of epoxy-group-containing organosilicon-modified polyester is as follows: Step A: Under nitrogen protection, 12 parts of hydroxy silicone oil, 0.96 part of 3-glycidoxypropylmethyldiethoxysilane and tetramethylammonium hydroxide silanolate were mixed evenly, reacted at 95 °C for 6 h, and then subjected to vacuum distillation to obtain epoxy organosilicon; the dosage of tetramethylammonium hydroxide silanolate was 0.02% of the total mass of hydroxy silicone oil and 3-glycidoxypropylmethyldiethoxysilane.

[0036] Step B: Under nitrogen protection, 12 parts of epoxy organosilicon and 60 parts of dihydroxy-terminated unsaturated polyester were mixed evenly, reacted at 150 °C for 4 h, then 0.48 part of dibutyltin dilaurate was added, and the temperature was raised to 175 °C and reacted until no water was produced to obtain epoxy organosilicon-modified polyester.

[0037] Example 3: A preparation process of a high wear-resistant alloy material, comprising the following steps: Step S1: WC powder, Co powder, Cu powder, Cr3C2 powder and absolute ethanol were put into a wet mill for ball milling (the ball-to-material ratio was 5:1, the ball milling speed was 55 r / min, and the ball milling time was 45 h), taken out, and dried to obtain a mixture; the mixture included the following components in mass percentages: Co: 6%, Cu: 2%, Cr3C2: 3%, and the balance was WC; the addition amount of absolute ethanol was 25% of the total mass of WC powder, Co powder, Cu powder and Cr3C2 powder; Step S2: 15 parts of mercapto-containing organosilicon, 75 parts of epoxy organosilicon-modified polyester and 180 parts of xylene were mixed evenly to obtain a modifier; 20 parts of the mixture and the modifier were mixed, ultrasonically dispersed for 50 min, stirred at 130 °C for 2 h, and after filtration, washing and drying, a mixture A was obtained; Step S3: 45 parts of the mixture was ultrasonically dispersed in a mixed solution of 540 parts of absolute ethanol, 180 parts of deionized water and 13.5 parts of 3-aminopropyltrimethoxysilane, reacted at 80 °C for 3 h, and after centrifugation, washing and drying, a mixture B was obtained; Step S4: Mix mixture A, mixture B, and binder through kneading (kneading temperature is 160 °C, kneading time is 2 h), and granulate to obtain the feedstock; inject the feedstock (injection temperature is 160 °C, injection pressure is 120 MPa, injection speed is 100 g / s, and mold temperature is 50 °C) to obtain the green body; degrease the green body (including solvent degreasing and thermal degreasing; the solvent degreasing process is: the solvent is n - heptane, degreasing time is 8 h, temperature is 60 °C; the thermal degreasing process is: thermal degreasing temperature is 800 °C, thermal degreasing time is 60 min), and then sinter and form (under the protection of nitrogen atmosphere, heat at a heating rate of 10 °C / min to 1500 °C, and sintering time is 12 h) to obtain the high - wear - resistant alloy material; by mass percentage, 20 wt% mixture A, 45 wt% mixture B, and the rest is binder; the binder includes the following components by mass percentage: ethylene - vinyl acetate copolymer 20 wt%, high - density polyethylene 20 wt%, poly(lactic acid) 10 wt%, stearic acid 5%, and the rest is paraffin; The preparation method of the mercapto - containing organosilicon is as follows: Under nitrogen protection, mix 0.3 parts of 3 - mercaptopropylmethyldimethoxysilane, 0.9 parts of deionized water, and 2.4 parts of isopropanol evenly, heat up to 70 °C, add 19.8 parts of hydroxy silicone oil and 0.42 parts of tetramethylammonium hydroxide and mix evenly, react for 6 h, and obtain the mercapto - containing organosilicon through vacuum distillation; The preparation method of epoxy - group - containing organosilicon - modified polyester is as follows: Step A: Under nitrogen protection, mix 12 parts of hydroxy silicone oil, 1.2 parts of 3 - glycidoxypropylmethyldiethoxysilane, and tetramethylammonium hydroxide silanolate evenly, react at 100 °C for 7 h, and obtain epoxy - group - containing organosilicon through vacuum distillation; the dosage of tetramethylammonium hydroxide silanolate is 0.022% of the total mass of hydroxy silicone oil and 3 - glycidoxypropylmethyldiethoxysilane; Step B: Under nitrogen protection, mix 12 parts of epoxy - group - containing organosilicon and 72 parts of di - hydroxy - terminated unsaturated polyester evenly, react at 160 °C for 5 h, then add 0.6 parts of dibutyltin dilaurate, heat up to 180 °C, and react until no water is produced to obtain epoxy - group - containing organosilicon - modified polyester.

[0038] Comparative Example 1: A preparation process of a high - wear - resistant alloy material, including the following steps: In Step S1, the mixture includes the following components by mass percentage: Co: 1%, Cu: 1.5%, Cr3C2: 2%, and the balance is WC; compared with Example 2, Comparative Example 1 only adds 1% of Co, and other steps are the same as those in Example 2.

[0039] Comparative Example 2: A preparation process of a high - wear - resistant alloy material, including the following steps: Compared with Example 2, in Step S2 of Comparative Example 2, epoxy group-containing organosilicon-modified polyester was not introduced, and the other steps were the same as those in Example 2.

[0040] Comparative Example 3: A preparation process of a high wear-resistant alloy material, comprising the following steps: Compared with Example 2, in Step S3 of Comparative Example 3, 3-aminopropyltrimethoxysilane was not used to modify the mixture, and the other steps were the same as those in Example 2.

[0041] Comparative Example 4: A preparation process of a high wear-resistant alloy material, comprising the following steps: Compared with Example 2, in Comparative Example 4, the epoxy group-containing organosilicon-modified polyester was replaced with the same mass of epoxy group-containing organosilicon, and the other steps were the same as those in Example 2.

[0042] Experiment: Take the high wear-resistant alloy materials prepared in Examples 1-3 and Comparative Examples 1-4 to prepare specimens. Hardness test: Use a Rockwell hardness tester to measure the hardness of the specimens. When testing, take 5-6 test sites and take the average value. The load is 150 kg and the loading time is 5 s; Flexural strength test: Test the flexural strength of the samples through an electronic universal testing machine. The sample size is 50 mm × 8 mm × 5 mm, and the loading rate is 0.5 mm / min; Wear resistance test: Use a Bruker UMT TriboLab friction and wear tester for testing. The test time is 48 h, and calculate its unit wear amount.

[0043]

[0044] According to the data in the above table, the following conclusions can be clearly obtained: 1. Compared with Example 1, the hardness and flexural strength of Comparative Example 1 both decreased, and the wear amount increased. It can be seen that reducing the content of Co in the mixture leads to a decrease in the wettability and interfacial bonding strength of the hard phase, which will have an adverse effect on the comprehensive performance of the alloy material.

[0045] 2. Compared with Examples 1-3, the hardness and flexural strength of Comparative Examples 2-4 both decreased, and the wear amount increased. It shows that in Comparative Example 2, the epoxy group-containing organosilicon-modified polyester was not introduced, resulting in a decrease in the compatibility between the binder and the mixture; in Comparative Example 3, 3-aminopropyltrimethoxysilane was not used to modify the mixture, and amino groups could not be introduced, resulting in a decrease in the bonding force between metal powders; compared with the epoxy group-containing organosilicon used in Comparative Example 4, the epoxy group-containing organosilicon-modified polyester prepared in the present invention has a better modification effect.

[0046] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0047] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A preparation method of a high wear-resistant alloy material, characterized in that: It includes the following steps: Step S1: Put WC powder, Co powder, Cu powder, Cr3C2 powder and absolute ethanol into a wet mill for ball milling. After taking it out and drying, a mixture is obtained. Step S2: Mix mercapto-organosilicon, epoxy-organosilicon modified polyester and xylene evenly to obtain a modifier. Mix the mixture and the modifier, disperse ultrasonically for 30 - 50 min, stir at 120 - 130 °C for 1 - 2 h, and after filtration, washing and drying, mixture A is obtained. Step S3: Disperse the mixture ultrasonically in a mixed solution of absolute ethanol, deionized water and 3-aminopropyltrimethoxysilane, react at 70 - 80 °C for 1 - 3 h, and after centrifugation, washing and drying, mixture B is obtained. Step S4: Mix mixture A, mixture B and a binder through mixing and granulation to obtain a feed. Inject the feed to form a green body. Debind the green body and then sinter and form it to obtain a high wear-resistant alloy material.

2. The preparation method of a highly wear-resistant alloy material according to claim 1, characterized in that: In step S1, the mixture includes the following components by mass percentage: Co: 3 - 6%, Cu: 1 - 2%, Cr3C2: 2 - 4%, and the balance is WC.

3. The preparation method of a highly wear-resistant alloy material according to claim 1, characterized in that: In step S2, the mass ratio of mercapto-organosilicon, epoxy-organosilicon modified polyester and xylene is 1:(4 - 5):(10 - 12).

4. The preparation method of a highly wear-resistant alloy material according to claim 3, characterized in that: The preparation method of the mercapto-organosilicon is as follows: Under nitrogen protection, mix 3-mercaptopropylmethyldimethoxysilane, deionized water and isopropanol evenly, heat up to 60 - 70 °C, add hydroxyl silicone oil and tetramethylammonium hydroxide and mix evenly, react for 4 - 6 h, and obtain mercapto-organosilicon through vacuum distillation.

5. The preparation method of a highly wear-resistant alloy material according to claim 3, characterized in that: The preparation method of the epoxy-organosilicon modified polyester is as follows: Step A: Under nitrogen protection, mix hydroxyl silicone oil, 3-glycidoxypropylmethyldiethoxysilane and tetramethylammonium hydroxide silanolate evenly, react at 90 - 100 °C for 5 - 7 h, and obtain epoxy-organosilicon through vacuum distillation. Step B: Under nitrogen protection, mix epoxy-organosilicon and dihydroxy-terminated unsaturated polyester evenly, react at 140 - 160 °C for 3 - 5 h, then add dibutyltin dilaurate, heat up to 170 - 180 °C, and react until no water is produced to obtain epoxy-organosilicon modified polyester.

6. The preparation method of a highly wear-resistant alloy material according to claim 1, characterized in that: In step S3, the mass ratio of the mixture, absolute ethanol, deionized water and 3-aminopropyltrimethoxysilane is 1:(10 - 12):(2 - 4):(0.1 - 0.3).

7. The preparation method of a highly wear-resistant alloy material according to claim 1, characterized in that: In step S4, the dosage of each component is: by mass percentage, 15 - 20 wt% of mixture A, 35 - 45 wt% of mixture B, and the rest is the binder.

8. The preparation method of a highly wear-resistant alloy material according to claim 7, characterized in that: The binder includes the following components by mass percentage: ethylene-vinyl acetate copolymer 10 - 20 wt%, high-density polyethylene 10 - 20 wt%, poly(lactic acid) 5 - 10 wt%, stearic acid 3 - 5%, and the rest is paraffin.

9. A high wear-resistant alloy material prepared by the preparation method according to any one of claims 1 - 8.

10. Application of the high wear-resistant alloy material according to claim 9 in a throat nozzle.

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