Wear-resistant material, method for producing the same and wear-resistant article

Abstract

The application relates to a wear-resistant material, a preparation method thereof and a wear-resistant product. Raw materials of the wear-resistant material include 110-120 parts of wear-resistant cast iron, 45-75 parts of chromium carbide, 4-20 parts of spheroidizing agent and 1-5 parts of inoculant, and the mass ratio of the wear-resistant cast iron to the chromium carbide is (2-4):1. The raw materials of the wear-resistant material include the wear-resistant cast iron and the chromium carbide with specific mass ratios, the wear-resistant cast iron has good impact toughness, the chromium carbide has good wear resistance, the spheroidizing agent and the inoculant with specific mass fractions are added, the graphitization effect is improved, and the wear-resistant material has good wear resistance, impact toughness and strength performance.

Description

Technical Field

[0001] This application relates to the field of composite materials, and in particular to a wear-resistant material, its preparation method, and wear-resistant articles. Background Technology

[0002] Grinding rollers are a component of mills, subjected to significant wear during the crushing and grinding of materials. They are typically made from wear-resistant materials such as alloy steel, but the wear resistance of these materials still needs improvement. Specifically, alloy carbon steel and ordinary low-alloy steel have poor wear resistance, and grinding rollers made from them can only process relatively soft materials. ZG65Mn manganese alloy steel and ZGMn13 high-manganese alloy steel have better wear resistance than alloy carbon steel and ordinary low-alloy steel, and can be used to process relatively hard materials, but their wear resistance can be further improved. Furthermore, traditional wear-resistant materials struggle to simultaneously achieve wear resistance, strength, and impact toughness. Summary of the Invention

[0003] Therefore, it is necessary to provide a wear-resistant material with good wear resistance, strength and impact toughness, as well as its preparation method and wear-resistant products.

[0004] A first aspect of this application provides a wear-resistant material, wherein the raw materials of the wear-resistant material comprise, by weight parts:

[0005] Wear-resistant cast iron, 110-200 parts

[0006] 45 to 75 parts of chromium carbide

[0007] 4 to 20 parts of spheroidizing agent, and

[0008] 1 to 5 parts of progesterone

[0009] The mass ratio of the wear-resistant cast iron to the chromium carbide is (2~4):1.

[0010] The raw materials for the above-mentioned wear-resistant materials include wear-resistant cast iron and chromium carbide in a specific mass ratio. Wear-resistant cast iron has good impact toughness, while chromium carbide has good wear resistance. At the same time, the addition of spheroidizing agent and inoculant in specific mass proportions can improve the graphitization effect, so that the wear-resistant materials have good wear resistance, impact toughness and strength properties.

[0011] Furthermore, during the preparation process, some chromium elements will precipitate from the molten wear-resistant cast iron and dissolve into the wear-resistant cast iron to form (FeCr)3C alloy cementite. This alloy cementite can further improve the wear resistance and impact toughness of the obtained material. The chromium carbide that has not undergone solid solution will be uniformly embedded in the wear-resistant cast iron in the form of small particles, improving the wear resistance, corrosion resistance and oxidation resistance of the material.

[0012] In some embodiments, the wear-resistant material comprises a substrate formed of wear-resistant cast iron and (FeCr)3C alloy cementite and chromium carbide particles located in the substrate formed of wear-resistant cast iron.

[0013] In some embodiments, the mass ratio of the wear-resistant cast iron to the chromium carbide is (2.5~3):1.

[0014] In some embodiments, the wear-resistant cast iron satisfies at least one of the following (1) to (3):

[0015] (1) The wear-resistant cast iron includes at least one of medium manganese ductile iron, medium chromium cast iron and high manganese ductile iron;

[0016] (2) The spheroidizing agent includes at least one of nickel-magnesium alloy, high-purity magnesium alloy and rare earth alloy;

[0017] (3) The inoculant includes at least one of strontium-containing ferrosilicon, barium-containing ferrosilicon and zirconium-containing ferrosilicon.

[0018] In some embodiments, the raw materials for preparing chromium carbide, by weight, include:

[0019] 35 to 55 parts chromium powder

[0020] 10 to 15 parts carbon fiber powder, and

[0021] 2 to 3 parts lubricant.

[0022] In some embodiments, the particle size of the chromium powder is 3 μm to 40 μm;

[0023] And / or, the lubricant includes at least one of stearic acid, graphite powder, and paraffin powder.

[0024] A second aspect of this application provides a method for preparing the wear-resistant material of the first aspect, comprising the following steps:

[0025] The wear-resistant cast iron is heated until it melts;

[0026] The wear-resistant material is prepared by adding the chromium carbide, the spheroidizing agent, and the inoculant to molten wear-resistant cast iron, followed by melting and molding.

[0027] In some embodiments, the method for preparing chromium carbide includes the following steps:

[0028] Chromium powder, carbon fiber powder, and lubricant are mixed to obtain a mixture;

[0029] The mixture is subjected to pressing, sintering and crushing processes to prepare chromium carbide.

[0030] In some embodiments, the preparation method satisfies at least one of the following (1) to (4):

[0031] (1) The heating temperature of the wear-resistant cast iron is 1500 ℃~1600 ℃;

[0032] (2) The pressure of the pressing process is 8 MPa to 10 MPa;

[0033] (3) The sintering temperature is 1250 ℃~1350 ℃;

[0034] (4) The sintering time is 8 h to 12 h.

[0035] A third aspect of this application provides a wear-resistant article comprising the wear-resistant material of the first aspect. Detailed Implementation

[0036] To facilitate understanding of this application, a more complete description will be provided below. This application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] The weights of the relevant components mentioned in the embodiments of this application can refer not only to the specific content of each component, but also to the proportional relationship between the weights of the components. Therefore, any scaling up or down of the content of the relevant components according to the embodiments of this application is within the scope disclosed in the embodiments of this application. Specifically, the weights mentioned in the embodiments of this application can be well-known units of mass in the chemical industry, such as μg, mg, g, and kg.

[0040] One embodiment of this application provides a wear-resistant material, wherein the raw materials of the wear-resistant material include, by weight parts:

[0041] Wear-resistant cast iron, 110-200 parts

[0042] 45 to 75 parts of chromium carbide

[0043] 4 to 20 parts of spheroidizing agent, and

[0044] 1 to 5 parts of the infertility agent

[0045] The mass ratio of wear-resistant cast iron to chromium carbide is (2~4):1.

[0046] Wear-resistant cast iron refers to cast iron with high hardness and high wear resistance under certain wear conditions. It has good impact toughness, but its mechanical properties are inferior to steel, and it is brittle and easily fractured. Common wear-resistant cast irons include chilled cast iron, wear-resistant white cast iron, and medium-manganese ductile iron. Optionally, the mass fraction of wear-resistant cast iron can be 110, 115, 120, 125, 126, 130, 132, 135, 140, 145, 150, 152, 153, 154, 155, 160, 165, 170, 175, 180, 190, or 200 parts. Other suitable selections within the range of 110 to 200 parts can also be made.

[0047] In one specific embodiment, the hardness of the wear-resistant cast iron is HRC≥40.

[0048] Chromium carbide exhibits good wear resistance, corrosion resistance, and oxidation resistance. The chromium carbide in this embodiment can be a commercially available product or synthesized using specific raw materials. Optionally, the mass fraction of chromium carbide can be 45 parts, 47 parts, 50 parts, 52 parts, 55 parts, 57 parts, 60 parts, 65 parts, 67 parts, 70 parts, or 75 parts. Other suitable selections within the range of 45 to 75 parts by mass are also possible.

[0049] Spheroidizing agents can cause graphite in cast iron to crystallize into spherical shapes, thereby improving the properties of the resulting material. Optionally, the mass fraction of the spheroidizing agent can be 4 parts, 4.5 parts, 4.7 parts, 5 parts, 5.5 parts, 5.7 parts, 6 parts, 6.7 parts, 7 parts, 7.05 parts, 7.3 parts, 8 parts, 10 parts, 10.4 parts, 12 parts, 14 parts, 16 parts, 18 parts, or 20 parts, and other suitable selections can be made within the range of 4 parts to 20 parts.

[0050] The inoculant can promote graphitization, reduce the tendency for white iron formation, improve the morphology and distribution of graphite, increase the number of eutectic clusters, and refine the matrix structure. Optionally, the mass fraction of the inoculant can be 1 part, 2 parts, 2.25 parts, 2.35 parts, 2.5 parts, 2.6 parts, 2.75 parts, 2.85 parts, 3 parts, 3.42 parts, 3.5 parts, 3.65 parts, 4 parts, or 5 parts, and other suitable selections can be made within the range of 1 to 5 parts.

[0051] Understandably, wear-resistant cast iron has good impact toughness, while chromium carbide has good wear resistance. When the two are compounded in a specific mass ratio, the wear-resistant material can possess good wear resistance, impact toughness, and strength properties. Optionally, the mass ratio of wear-resistant cast iron to chromium carbide can be 2:1, 2.2:1, 2.4:1, 2.6:1, 2.8:1, 2.81:1, 2.9:1, 2.91:1, 3:1, 3.2:1, 3.4:1, 3.6:1, 3.8:1, or 4:1. Other suitable choices within the range of (2~4):1 can also be made.

[0052] The raw materials for the above-mentioned wear-resistant materials include wear-resistant cast iron and chromium carbide in a specific mass ratio. Wear-resistant cast iron has good impact toughness, while chromium carbide has good wear resistance. At the same time, the addition of spheroidizing agent and inoculant in specific mass proportions can improve the graphitization effect, so that the wear-resistant materials have good wear resistance, impact toughness and strength properties.

[0053] Furthermore, during the preparation process, some chromium elements will precipitate from the molten wear-resistant cast iron and dissolve into the wear-resistant cast iron to form (FeCr)3C alloy cementite. This alloy cementite can further improve the wear resistance and impact toughness of the obtained material. The chromium carbide that has not undergone solid solution will be uniformly embedded in the wear-resistant cast iron in the form of small particles, improving the wear resistance, corrosion resistance and oxidation resistance of the material.

[0054] In some embodiments, the raw material for the wear-resistant material, by weight, consists of the following components:

[0055] Wear-resistant cast iron, 110-200 parts

[0056] 45 to 75 parts of chromium carbide

[0057] 4 to 20 parts of spheroidizing agent, and

[0058] 1 to 5 parts of the infertility agent

[0059] The mass ratio of wear-resistant cast iron to chromium carbide is (2~4):1.

[0060] In some embodiments, the wear-resistant material comprises a substrate formed of wear-resistant cast iron and (FeCr)3C alloy cementite and chromium carbide particles located in the substrate formed of wear-resistant cast iron.

[0061] In some embodiments, the raw materials for the wear-resistant material, by parts by weight, include:

[0062] Wear-resistant cast iron 125-175 parts

[0063] 47 to 70 parts of chromium carbide

[0064] 5 to 10 parts of spheroidizing agent, and

[0065] 1 to 5 parts of the infertility agent.

[0066] When the raw materials for wear-resistant materials include wear-resistant cast iron, chromium carbide, spheroidizing agent and inoculant in the above proportions, the wear resistance, impact toughness and strength properties of the resulting materials can be further improved.

[0067] In some embodiments, the mass ratio of wear-resistant cast iron to chromium carbide is (2.5~3):1. This mass ratio range allows for a better balance of the resulting material's wear resistance, impact toughness, and strength properties. Optionally, the mass ratio of wear-resistant cast iron to chromium carbide can be 2.5:1, 2.6:1, 2.65:1, 2.68:1, 2.69:1, 2.7:1, 2.75:1, 2.8:1, 2.9:1, or 3:1, and other suitable choices can be made within the range of (2.5~3):1.

[0068] In one specific embodiment, the mass ratio of wear-resistant cast iron to chromium carbide is (2.6~2.8):1.

[0069] In one specific embodiment, the mass ratio of wear-resistant cast iron to chromium carbide is (2.65~2.75):1.

[0070] In some embodiments, the wear-resistant cast iron includes at least one of medium-manganese ductile iron, medium-chromium cast iron, and high-manganese ductile iron.

[0071] In one specific embodiment, the manganese content in the medium manganese ductile iron is 5 wt%~9 wt%, and the silicon content is 3 wt%~5 wt%.

[0072] In one specific embodiment, the grade of medium manganese ductile iron is KmmQ.

[0073] In some embodiments, the spheroidizing agent includes at least one selected from nickel-magnesium alloys, high-purity magnesium alloys, and rare-earth alloys. Understandably, the nickel-magnesium alloy is an intermediate alloy obtained by high-temperature smelting of metallic nickel and metallic magnesium, with a magnesium content of 15 wt% to 50 wt%. The high-purity magnesium alloy is an alloy composed of high-purity magnesium (purity higher than 99.98%) as the base element and one or more alloying elements. The rare-earth alloy is an alloy formed by combining one or more rare-earth metal elements with other metallic and non-metallic elements.

[0074] In some embodiments, the inoculant includes at least one selected from strontium-containing ferrosilicon, barium-containing ferrosilicon, and zirconium-containing ferrosilicon. Optionally, the strontium content in the strontium-containing ferrosilicon is 0.6 wt% to 1 wt%, the barium content in the barium-containing ferrosilicon is 4 wt% to 6 wt%, and the zirconium content in the zirconium-containing ferrosilicon is 10 wt% to 15 wt%.

[0075] In some embodiments, the raw materials for the preparation of chromium carbide, by weight, include:

[0076] 35 to 55 parts chromium powder

[0077] 10 to 15 parts carbon fiber powder, and

[0078] 2 to 3 parts lubricant.

[0079] Understandably, the chromium carbide in this embodiment is prepared using raw materials in a specific ratio. The carbon fiber powder has good strength properties, and its reaction with chromium powder yields chromium carbide with good strength properties. Furthermore, in the ratio of chromium powder to carbon fiber powder in this embodiment, chromium powder is slightly in excess. Therefore, the resulting chromium carbide still contains unreacted chromium powder. During the preparation of wear-resistant materials, the chromium powder in the chromium carbide can increase the precipitation rate of chromium, which is beneficial to the formation of cementite in the (FeCr)3C alloy. In addition, a specific lubricant can better mix the chromium powder and carbon fiber powder, improving the overall performance of the resulting chromium carbide.

[0080] Optionally, the mass fraction of chromium powder can be 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, or 55 parts, and other suitable selections can be made within the range of 35 to 55 parts.

[0081] Optionally, the mass fraction of carbon fiber powder can be 10, 11, 12, 13, 14 or 15 parts, and other suitable selections can be made within the range of 10 to 15 parts.

[0082] Optionally, the mass fraction of the lubricant can be 2 or 3 parts, and other suitable selections can be made within the range of 2 to 3 parts.

[0083] In some embodiments, the particle size of the chromium powder is 3 μm to 40 μm. Optionally, the particle size of the chromium powder can be 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 25 μm, 30 μm, 35 μm, or 40 μm, and other suitable selections can also be made within the range of 3 μm to 40 μm.

[0084] In some embodiments, the lubricant includes at least one of stearic acid, graphite powder, and paraffin powder.

[0085] Another embodiment of this application provides a method for preparing the above-mentioned wear-resistant material, including the following steps S12 to S14.

[0086] S12. Heat the wear-resistant cast iron until it melts;

[0087] S14. Add chromium carbide, spheroidizing agent and inoculant to the molten wear-resistant cast iron, melt and shape it to prepare wear-resistant material.

[0088] In some embodiments, the heating temperature of the wear-resistant cast iron is 1500 ℃ to 1600 ℃. Optionally, the heating temperature of the wear-resistant cast iron can be 1500 ℃, 1520 ℃, 1540 ℃, 1550 ℃, 1560 ℃, 1580 ℃ or 1600 ℃.

[0089] In some embodiments, the forming process includes melt casting.

[0090] In some embodiments, the method for preparing chromium carbide includes the following steps:

[0091] Chromium powder, carbon fiber powder, and lubricant are mixed to obtain a mixture;

[0092] Chromium carbide is prepared by pressing, sintering and crushing the mixture.

[0093] In some embodiments, the raw materials for the preparation of chromium carbide, by weight, include:

[0094] 35 to 55 parts chromium powder

[0095] 10 to 15 parts carbon fiber powder, and

[0096] 2 to 3 parts lubricant.

[0097] In some embodiments, the pressure of the compression process is 8 MPa to 10 MPa.

[0098] In some embodiments, the compression process takes 1 to 2 hours.

[0099] In some embodiments, the sintering temperature is 1250 °C to 1350 °C.

[0100] In some embodiments, the sintering time is 8 h to 12 h.

[0101] In some embodiments, the crushing process uses a Raymond mill.

[0102] This application also provides a wear-resistant article comprising the aforementioned wear-resistant material.

[0103] In some embodiments, the wear-resistant article includes a grinding roller.

[0104] In a specific example, wear-resistant materials are processed into grinding rollers through machining.

[0105] The following are specific examples.

[0106] The raw materials for preparing the medium-manganese ductile iron in each embodiment and comparative example include: 70 parts by mass of scrap iron, 30 parts by mass of milled pig iron, 5 parts by mass of manganese, and 4.5 parts by mass of silicon.

[0107] Example 1

[0108] By weight, 35 parts of chromium powder (30 μm particle size), 10 parts of carbon fiber powder, and 2 parts of stearic acid were weighed and mixed in a V-type mixer to obtain a mixture. The mixture was placed in a mold and pressed at 8 MPa for 1 h to obtain a green body. The green body was placed in an induction furnace and sintered at 1300 °C in a hydrogen atmosphere for 10 h. After cooling, a chromium carbide green body was obtained. Argon gas was introduced into the cooling section of the induction furnace to prevent oxidation of the chromium carbide green body. The chromium carbide green body was then crushed in a Raymond mill to prepare granular chromium carbide.

[0109] By weight, 4.7 parts of nickel-magnesium alloy, 2.35 parts of strontium-containing ferrosilicon, and 126 parts of medium-manganese ductile iron were weighed. The medium-manganese ductile iron was added and melted at 1550 °C. After the medium-manganese ductile iron melted, it was poured into a reactor made of graphite clay. Chromium carbide, nickel-magnesium alloy, and strontium-containing ferrosilicon were mixed evenly in the molten medium-manganese ductile iron using the "subcontracting method". Then, it was poured into a cast iron mold and cooled to form a wear-resistant material.

[0110] Example 2

[0111] By weight, 45 parts of chromium powder (30 μm particle size), 10 parts of carbon fiber powder, and 2 parts of stearic acid were weighed and mixed in a V-type mixer to obtain a mixture. The mixture was placed in a mold and pressed at 8 MPa for 1 h to obtain a green body. The green body was placed in an induction furnace and sintered at 1300 °C in a hydrogen atmosphere for 10 h. After cooling, a chromium carbide green body was obtained. Argon gas was introduced into the cooling section of the induction furnace to prevent oxidation of the chromium carbide green body. The chromium carbide green body was then crushed in a Raymond mill to prepare granular chromium carbide.

[0112] By weight, 5.7 parts of nickel-magnesium alloy, 2.85 parts of strontium-containing ferrosilicon, and 153 parts of medium-manganese ductile iron were weighed. The medium-manganese ductile iron was added and melted at 1550 °C. After the medium-manganese ductile iron melted, it was poured into a reactor made of graphite clay. Chromium carbide, nickel-magnesium alloy, and strontium-containing ferrosilicon were mixed evenly in the molten medium-manganese ductile iron using the "subcontracting method". Then, it was poured into a cast iron mold and cooled to form a wear-resistant material.

[0113] Example 3

[0114] By weight, 55 parts of chromium powder (30 μm particle size), 10 parts of carbon fiber powder, and 2 parts of stearic acid were weighed and mixed in a V-type mixer to obtain a mixture. The mixture was placed in a mold and pressed at 8 MPa for 1 h to obtain a green body. The green body was placed in an induction furnace and sintered at 1300 °C in a hydrogen atmosphere for 10 h. After cooling, a chromium carbide green body was obtained. Argon gas was introduced into the cooling section of the induction furnace to prevent oxidation of the chromium carbide green body. The chromium carbide green body was then crushed in a Raymond mill to prepare granular chromium carbide.

[0115] By weight, 6.7 parts of nickel-magnesium alloy, 3.35 parts of strontium-containing ferrosilicon, and 180 parts of medium-manganese ductile iron were weighed. The medium-manganese ductile iron was added and melted at 1550 °C. After the medium-manganese ductile iron melted, it was poured into a reactor made of graphite clay. Chromium carbide, nickel-magnesium alloy, and strontium-containing ferrosilicon were mixed evenly in the molten medium-manganese ductile iron using the "subcontracting method". Then, it was poured into a cast iron mold and cooled to form a wear-resistant material.

[0116] Example 4

[0117] By weight, 35 parts of chromium powder (30 μm particle size), 10 parts of carbon fiber powder, and 2 parts of graphite powder were weighed and mixed in a V-type mixer to obtain a mixture. The mixture was placed in a mold and pressed at 8 MPa for 1 h to obtain a green body. The green body was placed in an induction furnace and sintered at 1300 °C in a hydrogen atmosphere for 10 h. After cooling, a chromium carbide green body was obtained. Argon gas was introduced into the cooling section of the induction furnace to prevent oxidation of the chromium carbide green body. The chromium carbide green body was then crushed in a Raymond mill to prepare granular chromium carbide.

[0118] By weight, 7.05 parts of rare earth alloy, 2.35 parts of strontium-containing ferrosilicon, and 132 parts of medium-manganese ductile iron were weighed. The medium-manganese ductile iron was added and melted at 1550 °C. After the medium-manganese ductile iron melted, it was poured into a reactor made of graphite clay. Chromium carbide, rare earth alloy, and strontium-containing ferrosilicon were mixed evenly in the molten medium-manganese ductile iron using the "subcontracting method". Then, it was poured into a cast iron mold and cooled to form a wear-resistant material.

[0119] Example 5

[0120] By weight, 35 parts of chromium powder (30 μm particle size), 15 parts of carbon fiber powder, and 2 parts of paraffin powder were weighed and mixed in a V-type mixer to obtain a mixture. The mixture was placed in a mold and pressed at 8 MPa for 1 h to obtain a green body. The green body was placed in an induction furnace and sintered at 1300 °C in a hydrogen atmosphere for 10 h. After cooling, a chromium carbide green body was obtained. Argon gas was introduced into the cooling section of the induction furnace to prevent oxidation of the chromium carbide green body. The chromium carbide green body was then crushed in a Raymond mill to prepare granular chromium carbide.

[0121] By weight, 10.4 parts of nickel-magnesium alloy, 2.6 parts of barium-containing ferrosilicon, and 152 parts of medium-manganese ductile iron were weighed. The medium-manganese ductile iron was added and melted at 1550 °C. After the medium-manganese ductile iron melted, it was poured into a reactor made of graphite clay. Chromium carbide, nickel-magnesium alloy, and barium-containing ferrosilicon were mixed evenly in the molten medium-manganese ductile iron using the "subcontracting method". Then, it was poured into a cast iron mold and cooled to form a wear-resistant material.

[0122] Example 6

[0123] By weight, 35 parts of chromium powder (30 μm particle size), 20 parts of carbon fiber powder, and 2 parts of stearic acid were weighed and mixed in a V-type mixer to obtain a mixture. The mixture was placed in a mold and pressed at 8 MPa for 1 h to obtain a green body. The green body was placed in an induction furnace and sintered at 1300 °C in a hydrogen atmosphere for 10 h. After cooling, a chromium carbide green body was obtained. Argon gas was introduced into the cooling section of the induction furnace to prevent oxidation of the chromium carbide green body. The chromium carbide green body was then crushed in a Raymond mill to prepare granular chromium carbide.

[0124] By weight, 5.7 parts of nickel-magnesium alloy, 3.42 parts of zirconium-containing ferrosilicon, and 154 parts of medium-manganese ductile iron were weighed. The medium-manganese ductile iron was added and melted at 1550 °C. After the medium-manganese ductile iron melted, it was poured into a reactor made of graphite clay. Chromium carbide, nickel-magnesium alloy, and zirconium-containing ferrosilicon were mixed evenly in the molten medium-manganese ductile iron using the "subcontracting method". Then, it was poured into a cast iron mold and cooled to form a wear-resistant material.

[0125] Example 7

[0126] By weight, 39 parts of chromium powder (30 μm particle size), 14 parts of carbon fiber powder, and 2 parts of stearic acid were weighed and mixed in a V-type mixer to obtain a mixture. The mixture was placed in a mold and pressed at 8 MPa for 1 h to obtain a green body. The green body was placed in an induction furnace and sintered at 1300 °C in a hydrogen atmosphere for 10 h. After cooling, a chromium carbide green body was obtained. Argon gas was introduced into the cooling section of the induction furnace to prevent oxidation of the chromium carbide green body. The chromium carbide green body was then crushed in a Raymond mill to prepare granular chromium carbide.

[0127] Weigh out 5.5 parts by weight of nickel-magnesium alloy, 2.75 parts by weight of strontium-containing ferrosilicon, and 110 parts by weight of medium-manganese ductile iron. Add the medium-manganese ductile iron to the solution at 1550 °C until it melts. After melting, pour the mixture into a reactor made of graphite clay. Using a "subcontracting method," mix chromium carbide, nickel-magnesium alloy, and strontium-containing ferrosilicon evenly in the molten medium-manganese ductile iron. Then pour the mixture into a cast iron mold and allow it to cool and solidify to obtain a wear-resistant material.

[0128] Example 8

[0129] By weight, 35 parts of chromium powder (30 μm particle size), 8 parts of carbon fiber powder, and 2 parts of stearic acid were weighed and mixed in a V-type mixer to obtain a mixture. The mixture was placed in a mold and pressed at 8 MPa for 1 h to obtain a green body. The green body was placed in an induction furnace and sintered at 1300 °C in a hydrogen atmosphere for 10 h. After cooling, a chromium carbide green body was obtained. Argon gas was introduced into the cooling section of the induction furnace to prevent oxidation of the chromium carbide green body. The chromium carbide green body was then crushed in a Raymond mill to prepare granular chromium carbide.

[0130] Weigh out 4.5 parts by weight of nickel-magnesium alloy, 2.25 parts by weight of strontium-containing ferrosilicon, and 180 parts by weight of medium-manganese ductile iron. Add the medium-manganese ductile iron to the solution at 1550 °C until it melts. After melting, pour the mixture into a reactor made of graphite clay. Using a "subcontracting method," mix chromium carbide, nickel-magnesium alloy, and strontium-containing ferrosilicon evenly in the molten medium-manganese ductile iron. Then pour the mixture into a cast iron mold and allow it to cool and solidify to obtain a wear-resistant material.

[0131] Example 9

[0132] By weight, 47 parts of chromium carbide, 4.7 parts of nickel-magnesium alloy, 2.35 parts of strontium-containing ferrosilicon, and 126 parts of medium-manganese ductile iron were weighed. The medium-manganese ductile iron was added and melted at 1550 °C. After the medium-manganese ductile iron melted, it was poured into a reactor made of graphite clay. The chromium carbide, nickel-magnesium alloy, and strontium-containing ferrosilicon were mixed evenly in the molten medium-manganese ductile iron using the "subcontracting method". Then, it was poured into a cast iron mold and cooled to form a wear-resistant material.

[0133] Example 10

[0134] By weight, 25 parts of chromium powder (30 μm particle size), 20 parts of carbon fiber powder, and 2 parts of stearic acid were weighed and mixed in a V-type mixer to obtain a mixture. The mixture was placed in a mold and pressed at 8 MPa for 1 h to obtain a green body. The green body was placed in an induction furnace and sintered at 1300 °C in a hydrogen atmosphere for 10 h. After cooling, a chromium carbide green body was obtained. Argon gas was introduced into the cooling section of the induction furnace to prevent oxidation of the chromium carbide green body. The chromium carbide green body was then crushed in a Raymond mill to prepare granular chromium carbide.

[0135] By weight, 4.7 parts of nickel-magnesium alloy, 2.35 parts of strontium-containing ferrosilicon, and 126 parts of medium-manganese ductile iron were weighed. The medium-manganese ductile iron was added and melted at 1550 °C. After the medium-manganese ductile iron melted, it was poured into a reactor made of graphite clay. Chromium carbide, nickel-magnesium alloy, and strontium-containing ferrosilicon were mixed evenly in the molten medium-manganese ductile iron using the "subcontracting method". Then, it was poured into a cast iron mold and cooled to form a wear-resistant material.

[0136] Comparative Example 1

[0137] The preparation method of Comparative Example 1 is basically the same as that of Example 1, except that an equal amount of carbon fiber powder is used instead of chromium powder, that is, a total of 45 parts of carbon fiber powder are added.

[0138] Comparative Example 2

[0139] By weight, 50 parts of chromium powder (30 μm particle size), 23 parts of carbon fiber powder, and 2 parts of stearic acid were weighed and mixed in a V-type mixer to obtain a mixture. The mixture was placed in a mold and pressed at 8 MPa for 1 h to obtain a green body. The green body was placed in an induction furnace and sintered at 1300 °C in a hydrogen atmosphere for 10 h. After cooling, a chromium carbide green body was obtained. Argon gas was introduced into the cooling section of the induction furnace to prevent oxidation of the chromium carbide green body. The chromium carbide green body was then crushed in a Raymond mill to prepare granular chromium carbide.

[0140] By weight, 7.3 parts of nickel-magnesium alloy, 3.65 parts of strontium-containing ferrosilicon, and 110 parts of medium-manganese ductile iron were weighed. The medium-manganese ductile iron was added and melted at 1550 °C. After the medium-manganese ductile iron melted, it was poured into a reactor made of graphite clay. Chromium carbide, nickel-magnesium alloy, and strontium-containing ferrosilicon were mixed evenly in the molten medium-manganese ductile iron using the "subcontracting method". Then, it was poured into a cast iron mold and cooled to form a wear-resistant material.

[0141] Comparative Example 3

[0142] By weight, 35 parts of chromium powder (30 μm particle size), 10 parts of carbon fiber powder, and 2 parts of stearic acid were weighed and mixed in a V-type mixer to obtain a mixture. The mixture was placed in a mold and pressed at 8 MPa for 1 h to obtain a green body. The green body was placed in an induction furnace and sintered at 1300 °C in a hydrogen atmosphere for 10 h. After cooling, a chromium carbide green body was obtained. Argon gas was introduced into the cooling section of the induction furnace to prevent oxidation of the chromium carbide green body. The chromium carbide green body was then crushed in a Raymond mill to prepare granular chromium carbide.

[0143] By weight, 4.7 parts of nickel-magnesium alloy, 2.35 parts of strontium-containing ferrosilicon, and 230 parts of medium-manganese ductile iron were weighed. The medium-manganese ductile iron was added and melted at 1550 °C. After the medium-manganese ductile iron melted, it was poured into a reactor made of graphite clay. Chromium carbide, nickel-magnesium alloy, and strontium-containing ferrosilicon were mixed evenly in the molten medium-manganese ductile iron using the "subcontracting method". Then, it was poured into a cast iron mold and cooled to form a wear-resistant material.

[0144] The mass fractions of each raw material in the preparation methods of Examples 1-10 and Comparative Examples 1-3 are shown in Table 1 below, where X represents the mass ratio of wear-resistant cast iron to chromium carbide.

[0145] Table 1

[0146]

[0147] The wear-resistant materials prepared in Examples 1-10 and Comparative Examples 1-3 were tested for density, compressive strength, flexural strength, hardness and impact toughness. The test results are shown in Table 2 below.

[0148] The testing standards for each performance test item are as follows:

[0149] Density: GB / T3850-2015.

[0150] Compressive strength: GB / T7314-2017.

[0151] Bending strength: GB / T14452-1993.

[0152] Hardness: GB / T230.1-2018.

[0153] Impact toughness: GB / T229-2020.

[0154] Table 2

[0155]

[0156] As shown in Table 2 above, the wear-resistant materials of Examples 1-10 exhibit high hardness and impact toughness, indicating that these examples can effectively improve the wear resistance and impact toughness of the materials, and also improve their strength and density. Compared to Example 1, Comparative Example 1, which uses an equal amount of carbon fiber powder instead of chromium powder in Example 1, shows a decrease in hardness and an impact toughness of only 5.94 J / cm. 2 The mass ratio of wear-resistant cast iron to chromium carbide in Comparative Examples 2 and 3 does not meet the requirements of this application. Their hardness, impact toughness, compressive strength, and flexural strength are all inferior to those of Example 1. This indicates that the application uses a specific mass ratio of wear-resistant cast iron and chromium carbide, and works synergistically with other raw material components to effectively improve the wear resistance, impact toughness, and strength of the resulting material.

[0157] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0158] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A wear-resistant material, characterized in that, The raw materials of the wear-resistant material, by weight, include: Wear-resistant cast iron, 110-200 parts 45 to 75 parts of chromium carbide 4 to 20 parts of spheroidizing agent, and 1 to 5 parts of the infertility agent The mass ratio of the wear-resistant cast iron to the chromium carbide is (2~4):1; The wear-resistant cast iron has a hardness of HRC≥40, and includes medium-manganese ductile iron, wherein the manganese content is 5 wt%~9 wt% and the silicon content is 3 wt%~5 wt%. The wear-resistant material comprises a substrate formed of wear-resistant cast iron and (FeCr)3C alloy cementite and chromium carbide particles located in the substrate formed of wear-resistant cast iron.

2. The wear-resistant material as described in claim 1, characterized in that, The mass ratio of the wear-resistant cast iron to the chromium carbide is (2.5~3):

1.

3. The wear-resistant material according to any one of claims 1 to 2, characterized in that, The wear-resistant material satisfies at least one of the following (1) to (2): (1) The spheroidizing agent includes at least one of nickel-magnesium alloy, high-purity magnesium alloy and rare earth alloy; (2) The inoculant includes at least one of strontium-containing ferrosilicon, barium-containing ferrosilicon and zirconium-containing ferrosilicon.

4. The wear-resistant material according to any one of claims 1 to 2, characterized in that, The raw materials for preparing chromium carbide, by mass parts, include: 35 to 55 parts chromium powder 10 to 15 parts carbon fiber powder, and 2 to 3 parts lubricant.

5. The wear-resistant material as described in claim 4, characterized in that, The particle size of the chromium powder is 3 μm to 40 μm; And / or, the lubricant includes at least one of stearic acid, graphite powder, and paraffin powder.

6. A method for preparing the wear-resistant material according to any one of claims 1 to 5, characterized in that, Includes the following steps: The wear-resistant cast iron is heated until it melts; The wear-resistant material is prepared by adding the chromium carbide, the spheroidizing agent, and the inoculant to molten wear-resistant cast iron, followed by melting and molding.

7. The method for preparing the wear-resistant material as described in claim 6, characterized in that, The method for preparing chromium carbide includes the following steps: Chromium powder, carbon fiber powder, and lubricant are mixed to obtain a mixture; The mixture is subjected to pressing, sintering and crushing processes to prepare chromium carbide.

8. The method for preparing the wear-resistant material as described in claim 7, characterized in that, The preparation method satisfies at least one of the following (1) to (4): (1) The heating temperature of the wear-resistant cast iron is 1500 ℃~1600 ℃; (2) The pressure of the pressing process is 8 MPa to 10 MPa; (3) The sintering temperature is 1250 ℃~1350 ℃; (4) The sintering time is 8 h to 12 h.

9. A wear-resistant product, characterized in that, Includes the wear-resistant material as described in any one of claims 1 to 5.

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