High-wear-resistance powder metallurgy material based on steam treatment and processing technology of high-wear-resistance powder metallurgy material

Abstract

The invention relates to the technical field of metallurgical materials, in particular to a high-wear-resistance powder metallurgy material based on steam treatment and a processing technology of the high-wear-resistance powder metallurgy material. The method comprises the following steps: 1, uniformly mixing wear-resistant composite powder, iron-based alloy powder, copper powder and zinc stearate to obtain mixed powder; 2, the mixed powder is subjected to compression molding, and a green body is obtained; the green body is placed in a vacuum sintering furnace to be sintered and cooled along with the furnace, and a powder metallurgy material is obtained; and thirdly, the powder metallurgy material is subjected to steam treatment, and the high-wear-resistance powder metallurgy material is obtained. The mixed powder is prepared from the following components in parts by weight: 30 to 50 parts of wear-resistant composite powder, 50 to 70 parts of iron-based alloy powder, 3 to 8 parts of copper powder and 0.5 to 1.5 parts of zinc stearate. The prepared high-wear-resistance powder metallurgy material not only has excellent mechanical properties, but also has excellent corrosion resistance, so that the service life of the high-wear-resistance powder metallurgy material is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgical materials, specifically a high-wear-resistance powder metallurgy material based on steam treatment and its processing technology. BACKGROUND

[0002] With the continuous progress of industrial technology, especially in the fields of mechanical manufacturing, automobile industry and aerospace, the demand for high-wear-resistance materials is increasing. Powder metallurgy, as an advanced material processing technology, has excellent material properties, high production efficiency and low raw material waste, so it has been widely used in the preparation of high-wear-resistance materials. The high-wear-resistance powder metallurgy material based on steam treatment combines the advantages of powder metallurgy and steam, and through the steam treatment process, the density, strength and wear resistance of the material can be effectively improved, which provides a new method for improving material performance.

[0003] Steam treatment technology mainly uses high-temperature steam for heat treatment and phase transformation of powder materials to improve their microstructure and enhance their mechanical properties and wear resistance. By controlling the temperature, pressure and treatment time of the steam, the powder materials can be precisely controlled to achieve the best mechanical properties under specific conditions. The Fe3O4 film layer formed after steam treatment may have problems such as uneven thickness, insufficient bonding force or high content of non-Fe3O4 phases (such as FeO, Fe2O3). This can cause the film layer to peel off easily during use, reducing wear resistance and corrosion resistance, especially in complex shapes or high-stress areas.

[0004] Therefore, we propose a high-wear-resistance powder metallurgy material based on steam treatment and its processing technology. SUMMARY

[0005] The purpose of the present application is to provide a high-wear-resistance powder metallurgy material based on steam treatment and its processing technology to solve the problems in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A processing technology for a high-wear-resistance powder metallurgy material based on steam treatment, comprising the following steps:

[0008] Step 1: Mix the wear-resistant composite powder, iron-based alloy powder, copper powder and zinc stearate uniformly to obtain a mixed powder;

[0009] Step 2: Press the mixed powder into a green body, and then place the green body in a vacuum sintering furnace for sintering and cooling in the furnace to obtain a powder metallurgy material;

[0010] Step 3: Steam treat the powder metallurgy material to obtain a high-wear-resistance powder metallurgy material.

[0011] Further, in step one, the mixed powder is composed of the following components in weight percentage: wear-resistant composite powder 30-50 parts, iron-based alloy powder 50-70 parts, copper powder 3-8 parts, zinc stearate 0.5-1.5 parts.

[0012] Further, the preparation method of the wear-resistant composite powder is as follows:

[0013] Step A: ultrasonic cleaning tungsten carbide with anhydrous ethanol for 20-30 min, and then ultrasonic cleaning with deionized water for 10-15 min, and drying to obtain pretreated tungsten carbide;

[0014] Step B: adding the pretreated tungsten carbide into an electroplating solution, and electroplating nickel under the condition of a magnetic field, vacuum filtration cleaning, and drying to obtain electroplated nickel-coated tungsten carbide;

[0015] Step C: putting the electroplated nickel-coated tungsten carbide and iron-chromium alloy powder into a medium-free jet mill, and grinding under argon protection for 10-30 min to obtain the wear-resistant composite powder.

[0016] Further, the composition of the electroplating solution is: nickel sulfamate 350-450 g / L, boric acid 30-50 g / L, nickel bromide 20-30 g / L, magnetic graphene oxide 5-15 g / L, silicon carbide 20-30 g / L, and sodium dodecyl sulfate 0.2-0.4 g / L; the pH value of the plating solution is 4-5.

[0017] Further, the process conditions for electroplating nickel are: current density 0.8-10 A / dm 2 , temperature 60-70℃, time 30-50 min, stirring the plating solution every 10 min during the electroplating process, the magnetic induction intensity generated by the magnetic field generator is kept at 0.1 T, and the magnetic field intensity is consistent with the direction of the electroplating current.

[0018] Further, the preparation method of the magnetic graphene oxide is as follows:

[0019] Mixing graphene oxide and deionized water, ultrasonic dispersion for 1-2 h to obtain a graphene oxide dispersion liquid, dropping into a mixed solution of iron nitrate nonahydrate, cobalt nitrate hexahydrate and deionized water, dropping for 30-50 min, adjusting the pH value to 12.5-13.0 using sodium hydroxide solution, transferring into an autoclave, reacting at 100℃ for 22-24 h, centrifuging, washing, and drying to obtain the magnetic graphene oxide.

[0020] Further, the concentration of the graphene oxide dispersion liquid is 1-3 mg / mL.

[0021] Further, the mass ratio of the graphene oxide to iron nitrate nonahydrate is 1: (2-3).

[0022] Further, the mass ratio of the nine hydrated ferric nitrate, cobalt nitrate hexahydrate and deionized water is 1: (0.35-0.40): (20-30).

[0023] Further, the mass ratio of the electroplated nickel coated tungsten carbide and iron-chromium alloy powder is 10: (1-3).

[0024] Further, the iron-based alloy powder is at least one of Fe-5Cr-2C powder, Fe-10Cr-5Mo powder or Fe-18Cr-8Ni powder.

[0025] Further, the pressing pressure is 540-660 MPa.

[0026] Further, the sintering process conditions are: heating to 300-500 DEG C at 2-5 DEG C / min, holding for 30-60 min; and then heating to 1100-1300 DEG C at 5-10 DEG C / min, holding for 60-180 min.

[0027] Further, the temperature of the steam treatment is 500-900 DEG C, and the treatment time is 4-7 h.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] 1. The high wear-resistant powder metallurgy material based on steam treatment and the processing technology thereof, by first plating nickel on the tungsten carbide, the composite nickel layer serving as an excellent bonding phase and transition layer, the wettability of the tungsten carbide and the iron-based alloy can be effectively improved, the metallurgical bonding is promoted in the sintering process, the interface bonding strength is greatly enhanced, and the hard particles are prevented from falling off prematurely in the wear process; then the iron-chromium alloy powder is subjected to airflow milling, the nickel-plated tungsten carbide and the iron-chromium alloy powder can be fully mixed and uniformly distributed, forming a core-shell structure composite powder with the iron-chromium alloy as the "shell", the uniform distribution of the wear-resistant phase in the final material is further ensured, agglomeration is avoided, and the wear resistance of the material is improved; finally, the steam reacts with the material surface at high temperature to form a dense, hard and stable oxide film with extremely high hardness, wear resistance and corrosion resistance. At the same time, the steam can penetrate into the open pores inside the material and also generate oxides on the inner wall of the pores; the steam treatment forms a synergistic strengthening effect inside and on the surface of the material, and the "bulk phase" and "surface" properties of the material are improved organically, and the strength of the core, the hardness and wear resistance of the surface, and the overall corrosion resistance are also improved, which is difficult to achieve by single component adjustment or sintering process.

[0030] 2. The high wear-resistant powder metallurgy material based on steam treatment and its processing technology, by introducing magnetic graphene oxide and silicon carbide into the electroplating solution, the synergistic effect is exerted, the silicon carbide (hard) serves as a hard skeleton and mainly provides the compression strength and the cutting and grinding resistance, the magnetic graphene oxide (soft) serves as a toughness and lubricating phase and mainly provides the toughening, crack resistance and friction reduction, and the nickel matrix serves as a continuous 'glue' and firmly combines all the components (tungsten carbide, SiC and magnetic graphene oxide) together and ensures the strong metallurgical combination with the final iron-based powder metallurgy material. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0032] The following parts are mass parts, unless otherwise specified. It should be noted that there is no special restriction on the purchase manufacturers of all the raw materials involved in the present application. Exemplarily, in the present embodiment, the tungsten carbide has a particle size of 5-10 μm and a carbon content of 6.08-6.18%; the iron-based alloy powder is Fe-18Cr-8Ni powder; the copper powder is electrolytic copper powder with a particle size of 20-40 μm; and the graphene oxide is model XFSG01, purchased from Xianfeng Nanometer.

[0033] Embodiment 1: A processing technology of a high wear-resistant powder metallurgy material based on steam treatment, comprising the following processes:

[0034] Step one: uniformly mixing the wear-resistant composite powder, the iron-based alloy powder, the copper powder and the zinc stearate to obtain a mixed powder; the mixed powder is composed of the following components in parts by weight: the wear-resistant composite powder 30 parts, the iron-based alloy powder 50 parts, the copper powder 3 parts and the zinc stearate 0.5 parts;

[0035] Step two: pressing the mixed powder to obtain a green body; placing the green body in a vacuum sintering furnace and sintering (heating to 300℃ at a rate of 2℃ / min and keeping for 30 min; then heating to 1100℃ at a rate of 5℃ / min and keeping for 180 min), and cooling with the furnace to obtain a powder metallurgy material;

[0036] Step three: steam treating the powder metallurgy material at a temperature of 500℃ for 7 h to obtain a high wear-resistant powder metallurgy material;

[0037] The preparation method of the wear-resistant composite powder is as follows:

[0038] Step A: ultrasonic cleaning tungsten carbide with anhydrous ethanol for 20 min, and then ultrasonic cleaning with deionized water for 10 min, drying to obtain pretreated tungsten carbide;

[0039] Step B: adding the pretreated tungsten carbide into the electroplating solution, nickel plating under the condition of magnetic field, vacuum filtration cleaning, drying to obtain electroplated nickel-coated tungsten carbide; the composition of the electroplating solution is: nickel sulfamate 350 g / L, boric acid 30 g / L, nickel bromide 20 g / L, magnetic graphene oxide 5 g / L, silicon carbide 20 g / L, sodium dodecyl sulfate 0.2 g / L; the pH value of the plating solution is 4; the current density is 0.8 A / dm 2 , the temperature is 60℃, the time is 30 min, the plating solution is stirred every 10 min during the electroplating process, the magnetic induction intensity generated by the magnetic field generator is kept at 0.1 T, and the magnetic field intensity and the electroplating current direction are consistent;

[0040] Step C: putting the electroplated nickel-coated tungsten carbide and iron-chromium alloy powder into the medium-free jet mill at a mass ratio of 10:1, grinding under the protection of argon gas at a grinding pressure of 0.4 MPa for 10 min to obtain wear-resistant composite powder;

[0041] The preparation method of the magnetic graphene oxide is as follows:

[0042] Mixing graphene oxide and deionized water, ultrasonic dispersion for 1 h to obtain 1 mg / mL graphene oxide dispersion, dropping into a mixed solution of iron nitrate nonahydrate, cobalt nitrate hexahydrate and deionized water, dropping for 30 min, adjusting pH=12.5 with sodium hydroxide solution, transferring into an autoclave, reacting at 100℃ for 22 h, centrifuging, washing and drying to obtain magnetic graphene oxide; the mass ratio of graphene oxide to iron nitrate nonahydrate is 1:2; the mass ratio of iron nitrate nonahydrate, cobalt nitrate hexahydrate and deionized water is 1:0.35:20.

[0043] Example 2: a processing technology of high wear-resistant powder metallurgy material based on steam treatment, comprising the following processes:

[0044] Step one: uniformly mixing wear-resistant composite powder, iron-based alloy powder, copper powder and zinc stearate to obtain mixed powder; the mixed powder is composed of the following components by weight fraction: wear-resistant composite powder 40 parts, iron-based alloy powder 60 parts, copper powder 5 parts, and zinc stearate 1 part;

[0045] Step two: pressing the mixed powder to form a green body at a pressure of 600 MPa; placing the green body in a vacuum sintering furnace for sintering (ramping up to 400℃ at a rate of 3℃ / min and keeping for 50 min; then ramping up to 1200℃ at a rate of 8℃ / min and keeping for 120 min), and cooling in the furnace to obtain a powder metallurgy material;

[0046] Step three: steam treatment of the powder metallurgy material at a temperature of 650 DEG C for 6 hours to obtain a high wear-resistant powder metallurgy material;

[0047] The preparation method of the wear-resistant composite powder is as follows:

[0048] Step A: ultrasonic cleaning of tungsten carbide with anhydrous ethanol for 25 minutes, and then ultrasonic cleaning with deionized water for 12 minutes, and drying to obtain pretreated tungsten carbide;

[0049] Step B: adding the pretreated tungsten carbide into an electroplating solution to electroplate nickel under the condition of a magnetic field, vacuum filtration cleaning, and drying to obtain electroplated nickel-coated tungsten carbide; the composition of the electroplating solution is: nickel sulfamate 400 g / L, boric acid 40 g / L, nickel bromide 25 g / L, magnetic graphene oxide 10 g / L, silicon carbide 25 g / L, and sodium dodecyl sulfate 0.3 g / L; the pH value of the plating solution is 4.5; the current density is 3 A / dm 2 , the temperature is 65 DEG C, the time is 40 minutes, the electroplating solution is stirred every 10 minutes during the electroplating process, the magnetic induction intensity generated by the magnetic field generator is kept at 0.1 T, and the magnetic field intensity and the electroplating current direction are consistent;

[0050] Step C: putting the electroplated nickel-coated tungsten carbide and the iron-chromium alloy powder into a medium-free jet mill at a mass ratio of 10:2, grinding under argon protection at a grinding pressure of 0.5 Mpa for 20 minutes to obtain a wear-resistant composite powder;

[0051] The preparation method of the magnetic graphene oxide is as follows:

[0052] Mixing graphene oxide and deionized water, ultrasonic dispersion for 2 hours to obtain a 3 mg / mL graphene oxide dispersion, dropping into a mixed solution of iron nitrate nonahydrate, cobalt nitrate hexahydrate and deionized water, dropping for 50 minutes, adjusting the pH value to 13.0 with sodium hydroxide solution, transferring into an autoclave, reacting at 100 DEG C for 24 hours, centrifuging, washing and drying to obtain magnetic graphene oxide; the mass ratio of graphene oxide to iron nitrate nonahydrate is 1:2.5; further, the mass ratio of the iron nitrate nonahydrate, the cobalt nitrate hexahydrate and the deionized water is 1:0.38:30.

[0053] Example 3: a processing technology of a high wear-resistant powder metallurgy material based on steam treatment, comprising the following processes:

[0054] Step one: mixing the wear-resistant composite powder, the iron-based alloy powder, the copper powder and the zinc stearate uniformly to obtain a mixed powder;

[0055] Step two: the mixed powder is pressed into a green body under a pressure of 660 MPa; the green body is placed in a vacuum sintering furnace for sintering (heated to 500℃ at a rate of 5℃ / min and kept for 60 min; then heated to 1300℃ at a rate of 10℃ / min and kept for 60 min), and cooled in the furnace to obtain a powder metallurgy material;

[0056] Step three: the powder metallurgy material is treated by steam at a temperature of 900℃ for 4h to obtain a high wear-resistant powder metallurgy material; the high wear-resistant powder metallurgy material is composed of the following components in parts by weight: wear-resistant composite powder 50 parts, iron-based alloy powder 70 parts, copper powder 8 parts, and zinc stearate 1.5 parts.

[0057] The preparation method of the wear-resistant composite powder is as follows:

[0058] Step A: the tungsten carbide is ultrasonically cleaned with anhydrous ethanol for 30 min, and then ultrasonically cleaned with deionized water for 15 min; after drying, a pretreated tungsten carbide is obtained;

[0059] Step B: the pretreated tungsten carbide is added to an electroplating solution, and nickel plating is carried out under the condition of a magnetic field; after vacuum filtration and cleaning, the electroplated nickel-coated tungsten carbide is obtained after drying; the composition of the electroplating solution is: nickel sulfamate 450g / L, boric acid 50g / L, nickel bromide 30g / L, magnetic graphene oxide 15g / L, silicon carbide 30g / L, and sodium dodecyl sulfate 0.4g / L; the pH value of the plating solution is 5; the current density is 10A / dm 2 , the temperature is 70℃, the time is 50 min, the plating solution is stirred every 10 min during the electroplating process, the magnetic induction intensity generated by the magnetic field generator is kept at 0.1T, and the magnetic field intensity and the electroplating current direction are consistent;

[0060] Step C: the electroplated nickel-coated tungsten carbide and the iron-chromium alloy powder are put into a medium-free jet mill at a mass ratio of 10:3, and are ground under argon protection at a grinding pressure of 0.6Mpa for 30 min to obtain a wear-resistant composite powder;

[0061] The preparation method of the magnetic graphene oxide is as follows:

[0062] The graphene oxide and deionized water are mixed and ultrasonically dispersed for 2h to obtain a 3mg / mL graphene oxide dispersion liquid, which is dropped into a mixed solution of iron nitrate nonahydrate, cobalt nitrate hexahydrate and deionized water, and the dropping is completed in 50 min; sodium hydroxide solution is used to adjust the pH value to 13.0, and then the mixture is transferred into an autoclave for reaction at 100℃ for 24h; after centrifugation, washing and drying, the magnetic graphene oxide is obtained; the mass ratio of the graphene oxide to the iron nitrate nonahydrate is 1:3; the mass ratio of the iron nitrate nonahydrate, the cobalt nitrate hexahydrate and the deionized water is 1:0.40:30.

[0063] Comparative Example 1: A processing technology of high wear-resistant powder metallurgy material based on steam treatment, comprising the following processes:

[0064] Step one: uniformly mix tungsten carbide, iron-based alloy powder, copper powder, and zinc stearate to obtain a mixed powder; the mixed powder is composed of the following components in parts by weight: 40 parts of tungsten carbide, 60 parts of iron-based alloy powder, 5 parts of copper powder, and 1 part of zinc stearate;

[0065] Step two: press-form the mixed powder at a pressure of 600 MPa to obtain a green body; place the green body in a vacuum sintering furnace and sinter (heat to 400℃ at a rate of 3℃ / min and maintain for 50 min; then heat to 1200℃ at a rate of 8℃ / min and maintain for 120 min), and cool with the furnace to obtain a powder metallurgy material;

[0066] Step three: perform steam treatment on the powder metallurgy material at a temperature of 650℃ for 6h to obtain a high wear-resistant powder metallurgy material;

[0067] Comparative Example 1 is based on Example 2, and in Comparative Example 1, the wear-resistant composite powder is replaced with tungsten carbide of the same mass, and the remaining process steps and reaction parameters are consistent with those of Example 2.

[0068] Comparative Example 2: A processing technology of high wear-resistant powder metallurgy material based on steam treatment, comprising the following processes:

[0069] Step one: uniformly mix wear-resistant composite powder, iron-based alloy powder, copper powder, and zinc stearate to obtain a mixed powder; the mixed powder is composed of the following components in parts by weight: 40 parts of wear-resistant composite powder, 60 parts of iron-based alloy powder, 5 parts of copper powder, and 1 part of zinc stearate;

[0070] Step two: press-form the mixed powder at a pressure of 600 MPa to obtain a green body; place the green body in a vacuum sintering furnace and sinter (heat to 400℃ at a rate of 3℃ / min and maintain for 50 min; then heat to 1200℃ at a rate of 8℃ / min and maintain for 120 min), and cool with the furnace to obtain a powder metallurgy material;

[0071] Step three: perform steam treatment on the powder metallurgy material at a temperature of 650℃ for 6h to obtain a high wear-resistant powder metallurgy material;

[0072] The preparation method of the wear-resistant composite powder is as follows:

[0073] Step A: ultrasonically clean tungsten carbide with anhydrous ethanol for 25 min, then ultrasonically clean with deionized water for 12 min, and dry to obtain pretreated tungsten carbide;

[0074] Step B: The pretreated tungsten carbide is added into the electroplating solution to carry out nickel plating, vacuum filtration cleaning, and drying to obtain the electroplated nickel-coated tungsten carbide; the composition of the electroplating solution is: nickel sulfamate 400 g / L, boric acid 40 g / L, nickel bromide 25 g / L, silicon carbide 25 g / L, and sodium dodecyl sulfate 0.3 g / L; the pH value of the plating solution is 4.5; the current density is 3 A / dm 2 , the temperature is 65℃, the time is 40 min, and the plating solution is stirred every 10 min during the electroplating process;

[0075] Step C: The electroplated nickel-coated tungsten carbide and the iron-chromium alloy powder are put into the medium-free jet mill at a mass ratio of 10:2, and are ground under argon protection at a grinding pressure of 0.5 MPa for 20 min to obtain the wear-resistant composite powder;

[0076] Comparative Example 2 is based on Example 2, and in Comparative Example 2, the magnetic graphene oxide is not introduced, and the magnetic field condition is deleted, and the other steps are the same as those of Example 2.

[0077] Comparative Example 3: A processing technology of a high wear-resistant powder metallurgical material based on steam treatment, comprising the following processes:

[0078] Comparative Example 3 is based on Example 2, and in Comparative Example 3, the mixed powder is composed of the following components by weight: 15 parts of wear-resistant composite powder, 60 parts of iron-based alloy powder, 5 parts of copper powder, and 1 part of zinc stearate, and the other steps are the same as those of Example 2.

[0079] Comparative Example 4: A processing technology of a high wear-resistant powder metallurgical material based on steam treatment, comprising the following processes:

[0080] Step one: The wear-resistant composite powder, the iron-based alloy powder, the copper powder, and the zinc stearate are mixed uniformly to obtain a mixed powder; the mixed powder is composed of the following components by weight: 40 parts of wear-resistant composite powder, 60 parts of iron-based alloy powder, 5 parts of copper powder, and 1 part of zinc stearate;

[0081] Step two: The mixed powder is pressed into a green body at a pressure of 600 MPa; the green body is placed in a vacuum sintering furnace to be sintered (heated to 400℃ at a rate of 3℃ / min and kept for 50 min; then heated to 1200℃ at a rate of 8℃ / min and kept for 120 min), and cooled in the furnace to obtain a high wear-resistant powder metallurgical material;

[0082] Comparative Example 4 is based on Example 2, and in Comparative Example 4, the steam treatment is not carried out, and the other steps are the same as those of Example 2.

[0083] Experiment: The high wear-resistant powder metallurgical materials obtained in Examples 1-3 and Comparative Examples 1-4 are taken to prepare samples, and the properties of the samples are detected and the detection results are recorded:

[0084] Wear resistance: MLS-225 type wear tester was used, the load was 50 N, the rotation speed was 240 r / min, the time was 120 min, and the wear amount was recorded.

[0085] Tensile strength: tested according to the standard GB / T 228.1-2021, the tensile rate was 50 mm / min.

[0086] Corrosion resistance: the high wear-resistant powder metallurgy material was subjected to salt spray corrosion resistance test, the test temperature was 35 ℃, 5% mass concentration of sodium chloride aqueous solution was sprayed in the test box to simulate the accelerated corrosion of the environment, and the high wear-resistant powder metallurgy material with a tolerance time (i.e. the time of keeping rust-free) of more than 800 h was qualified in corrosion resistance, otherwise it was unqualified.

[0087] The test results are shown in Table 1.

[0088] Table 1: Performance test results of high wear-resistant powder metallurgy material

[0089]

[0090] According to the data in the above table, the following conclusions can be clearly obtained:

[0091] In combination with Examples 1-3 and Comparative Examples 1-4, it can be seen that the high wear-resistant powder metallurgy material prepared by the present application has excellent mechanical properties and corrosion resistance; compared with Examples 1-3, the wear resistance, tensile strength and corrosion resistance of the products obtained in Comparative Examples 1 and 2 are all decreased, which shows that the wear-resistant composite powder prepared by the present application has better wear resistance and interface compatibility compared with tungsten carbide, thereby effectively improving the comprehensive performance of the material; at the same time, the present application introduces magnetic graphene oxide and carries out electroplating under the condition of a magnetic field, which further solves the industry problem that nano materials are easy to agglomerate and unevenly distributed in the composite coating, and significantly improves the flatness, density and uniformity of the coating; the wear resistance, tensile strength and corrosion resistance of the products obtained in Comparative Examples 3 and 4 are all decreased, which shows that the performance of the high wear-resistant powder metallurgy material prepared by the present application is affected by the component ratio, and the selection of the component ratio within the range can prepare a material with excellent comprehensive performance; at the same time, the present application generates a dense, hard and stable oxide film on the material through steam treatment, which has extremely high hardness, wear resistance and corrosion resistance.

[0092] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A processing technology for high wear-resistant powder metallurgy materials based on steam treatment, characterized in that: Includes the following steps: Step 1: Mix the wear-resistant composite powder, iron-based alloy powder, copper powder, and zinc stearate evenly to obtain a mixed powder; Step 2: Press the mixed powder into shape to obtain a green body; place the green body in a vacuum sintering furnace for sintering, and cool it with the furnace to obtain powder metallurgy material; Step 3: Steam treatment is performed on the powder metallurgy material to obtain a high wear-resistant powder metallurgy material.

2. The processing technology for a high wear-resistant powder metallurgy material based on steam treatment according to claim 1, characterized in that: In step one, the mixed powder is composed of the following components in parts by weight: 30-50 parts of wear-resistant composite powder, 50-70 parts of iron-based alloy powder, 3-8 parts of copper powder, and 0.5-1.5 parts of zinc stearate.

3. The processing technology for a high wear-resistant powder metallurgy material based on steam treatment according to claim 2, characterized in that: The preparation method of the wear-resistant composite powder is as follows: Step A: Ultrasonic cleaning of tungsten carbide with anhydrous ethanol for 20-30 min, followed by ultrasonic cleaning with deionized water for 10-15 min, and drying to obtain pretreated tungsten carbide; Step B: Add the pretreated tungsten carbide to the electroplating solution, perform nickel plating under magnetic field conditions, vacuum filter and clean, and dry to obtain nickel-plated tungsten carbide. Step C: Electroplated nickel-coated tungsten carbide and iron-chromium alloy powder are put into a media-free air jet mill and ground for 10-30 minutes under argon protection to obtain wear-resistant composite powder.

4. The processing technology for a high wear-resistant powder metallurgy material based on steam treatment according to claim 3, characterized in that: The electroplating solution is composed of: nickel sulfamate 350-450 g / L, boric acid 30-50 g / L, nickel bromide 20-30 g / L, magnetic graphene oxide 5-15 g / L, silicon carbide 20-30 g / L, sodium dodecyl sulfate 0.2-0.4 g / L; the pH value of the plating solution is 4-5.

5. The processing technology for a high wear-resistant powder metallurgy material based on steam treatment according to claim 4, characterized in that: The magnetic graphene oxide is prepared as follows: Graphene oxide and deionized water were mixed and ultrasonically dispersed for 1-2 hours to obtain a graphene oxide dispersion. A mixed solution of ferric nitrate nonahydrate, cobalt nitrate hexahydrate, and deionized water was added dropwise over 30-50 minutes. The pH was adjusted to 12.5-13.0 using sodium hydroxide solution. The mixture was then transferred to a hydrothermal reactor and reacted at 100°C for 22-24 hours. After centrifugation, washing, and drying, magnetic graphene oxide was obtained.

6. The processing technology for a high wear-resistant powder metallurgy material based on steam treatment according to claim 3, characterized in that: The nickel plating process conditions are: current density 0.8~10A / dm³. 2 The temperature is 60-70℃, the time is 30-50 minutes, the electroplating solution is stirred once every 10 minutes during the electroplating process, the magnetic induction intensity generated by the magnetic field generator is kept at 0.1T, and the magnetic field intensity is in the same direction as the electroplating current.

7. The processing technology for a high wear-resistant powder metallurgy material based on steam treatment according to claim 3, characterized in that: The mass ratio of the electroplated nickel-coated tungsten carbide to the iron-chromium alloy powder is 10:(1-3).

8. The processing technology for a high wear-resistant powder metallurgy material based on steam treatment according to claim 1, characterized in that: The iron-based alloy powder is at least one of Fe-5Cr-2C powder, Fe-10Cr-5Mo powder, or Fe-18Cr-8Ni powder.

9. The processing technology for a high wear-resistant powder metallurgy material based on steam treatment according to claim 1, characterized in that: The steam treatment temperature is 500–900°C, and the treatment time is 4–7 hours.

10. A high wear-resistant powder metallurgy material based on steam treatment, obtained by the processing technology according to any one of claims 1-9.

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