WC ceramic particle reinforced iron-based self-lubricating wear-resistant bulk material and preparation method thereof

Abstract

This invention discloses a WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material. This material is formed by adding WC powder to molten iron. The material's microstructure consists of WC ceramic particles and spheroidal graphite uniformly distributed within an iron matrix. The molten iron is composed of scrap steel, virgin iron, ferrosilicon, a carburizing agent, an inoculant, and a spheroidizing agent, with the following composition by mass percentage: C: 3.4%–3.7%, Si: 2.4%–2.8%, Mn: ≤0.6%, S: ≤0.02%, P: ≤0.1%, Mg: 0.02%–0.04%, Re: 0.02%–0.04%, with the balance being Fe and unavoidable impurities. The WC powder constitutes 10%–40% of the total mass of the WC powder and molten iron. This invention also discloses a method for preparing the above-mentioned bulk material. The material of this invention features uniform distribution of WC ceramic particles and good tribological properties.

Description

Technical Field

[0001] This invention belongs to the field of iron-based composite material technology, specifically relating to a micron-sized WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material. This invention also relates to a method for preparing the above-mentioned bulk material. Background Technology

[0002] With the continuous development of modern industry, there is an urgent need for steel component materials that can operate under various extreme friction and wear conditions (such as high temperature, high speed, heavy load, and high wear), such as materials used in crusher hammers, excavator bucket teeth, high-speed train brake pads, and rolling mill rolls. Traditional steel materials are usually improved by heat treatment, alloying, or a combination of both to increase material hardness and thus improve friction and wear performance. However, these methods have limited effect on improving the wear performance of steel materials and are gradually becoming insufficient to meet the service conditions of high temperature, high speed, and frequent wear. Therefore, researchers have attempted to use composite methods, using hard ceramic particles as the reinforcing phase, to propose ceramic particle reinforced steel / iron-based composite materials.

[0003] Due to the high melting point of steel and the difficulty in uniformly distributing ceramic particles within molten iron, current research on the preparation of most steel / iron-based composite materials is limited to surface reinforcement. The preparation of bulk ceramic particle-reinforced steel / iron-based composite materials is technically challenging, complex, and costly. Therefore, there is an urgent need to develop a simple and cost-effective preparation technology for ceramic particle-reinforced bulk iron-based composite materials. Furthermore, improving lubrication performance to reduce material wear has become an important measure to extend the service life of components. Graphite, with its stable chemical properties, hexagonal lamellar structure, high thermal conductivity, and low friction, is an excellent solid lubricant. If it can be introduced as a composite phase into ceramic particle-reinforced steel / iron-based composite materials, its self-lubricating and friction-reducing effect will significantly reduce the coefficient of friction of steel / iron-based composite materials under friction and wear conditions, thereby improving the material's tribological performance. In summary, how to simultaneously introduce uniformly distributed graphite lubricating phases and hard ceramic additive phases into the iron matrix to prepare ceramic particle-reinforced iron-based self-lubricating bulk materials with excellent tribological performance is a key problem that urgently needs to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide a WC ceramic particle reinforced iron-based self-lubricating wear-resistant bulk material, which has the characteristics of uniform distribution of WC ceramic particles and good friction and wear performance.

[0005] Another object of the present invention is to provide a method for preparing the above-mentioned bulk material.

[0006] The technical solution adopted in this invention is a WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material. The bulk material is formed by adding WC powder to molten iron. The material's microstructure consists of WC ceramic particles and spherical graphite uniformly distributed in the iron matrix. The molten iron raw materials include scrap steel, virgin iron, ferrosilicon, carburizing agent, inoculant, and spheroidizing agent, and are composed of the following raw material components by mass percentage: C: 3.4%–3.7%, Si: 2.4%–2.8%, Mn: ≤0.6%, S: ≤0.02%, P: ≤0.1%, Mg: 0.02%–0.04%, Re: 0.02%–0.04%, with the balance being Fe and unavoidable impurities. The mass of WC powder is 10%–40% of the total mass of WC powder and molten iron.

[0007] Another technical solution adopted in this invention is a method for preparing WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material, which is specifically implemented according to the following steps:

[0008] Step 1: Weigh the molten iron raw materials and WC powder. The molten iron raw materials include: scrap steel, virgin iron, ferrosilicon, carburizing agent, inoculant and spheroidizing agent. Then heat and melt the weighed scrap steel, virgin iron, ferrosilicon and carburizing agent into molten iron.

[0009] Step 2: Pour molten iron into a ladle that has been pre-lined with spheroidizing agent, inoculant and covered with iron filings at the bottom for spheroidizing and inoculation treatment;

[0010] Step 3: Disperse the WC casting powder through a sieve and add it to the molten iron in Step 2;

[0011] Step 4: Quickly pour the WC and molten iron mixture obtained in Step 3 into a crystallizer with a water-cooled graphite inner sleeve;

[0012] Step 5: Keep the mixed melt in the crystallizer for 1-3 minutes, then quickly pull out the crystallizer and continue to solidify. After complete solidification, WC ceramic particle reinforced iron-based self-lubricating wear-resistant bulk material is obtained.

[0013] Another feature of the technical solution of this invention is that:

[0014] The mass percentages of each element in the molten iron raw material in step 1 are as follows: C: 3.4%–3.7%, Si: 2.4%–2.8%, Mn: ≤0.6%, S: ≤0.02%, P: ≤0.1%, Mg: 0.02%–0.04%, Re: 0.02%–0.04%, with the balance being Fe and unavoidable impurities; and the mass of WC powder is 10%–40% of the total mass of WC powder and molten iron raw material.

[0015] In step 1, the primary iron is bread iron.

[0016] The heating and melting temperature in step 1 is 1570–1650℃, and the holding time is 2–4 minutes.

[0017] In step 1, the spheroidizing agent is Si-Mg-Ca-Re, which is composed of the following raw material components by mass percentage: Si: 43-47%, Mg: 5.7-6.1%, Ca: 2.5-2.8%, Re: 0.9-1.1%, with the balance being Fe and unavoidable impurities; the amount of spheroidizing agent prepared accounts for 1.0-1.2% of the total mass of the molten iron raw material.

[0018] In step 1, the inoculant is Si-Ba-Ca, which is composed of the following raw material components by mass percentage: Si: 66-69%, Ba: 3.9-4.0%, Ca: 1.3-1.7%, with the balance being Fe and unavoidable impurities; the amount of inoculant prepared accounts for 0.6-0.8% of the total mass of the molten iron raw material.

[0019] In step 2, the spheroidizing agent is laid at the bottom of the ladle, and then covered with inoculant and iron filings in sequence.

[0020] In step 2, the temperature of the molten iron after spheroidizing inoculation treatment is controlled at 1520-1580℃.

[0021] Step 3 involves adding WC powder to molten iron while continuously stirring, and the temperature of the WC ceramic particles and molten iron mixture should be controlled between 1350 and 1400°C.

[0022] The beneficial effects of this invention are:

[0023] (1) The method of the present invention first melts iron raw materials to form molten iron. After spheroidizing and inoculating, WC powder is dispersed into the high-temperature molten iron through a sieve. During the stirring process, since the WC ceramic particles are almost completely wetted by the molten iron, they are easily dispersed evenly and undergo a certain interface reaction with the high-temperature molten iron to form a metallurgical bond. During the casting process, a crystallizer with a water-cooled graphite inner sleeve is used for rapid solidification. This method of rapid solidification with large supercooling in the liquid phase effectively inhibits the downward agglomeration of WC ceramic particles due to high density and gravity during the solidification process, so that the WC particles are evenly distributed in the iron matrix block material, ensuring the wear-resistant effect of WC ceramic particles. In addition, the rapid solidification with large supercooling in the liquid phase is also conducive to the precipitation of ductile iron in a high-density dispersed distribution state, thereby ensuring the self-lubricating and friction-reducing effect of ductile iron. During the friction and wear process, the high-density dispersed spheroidal graphite precipitated in the iron matrix will form a graphite lubricating film at the friction interface, which plays a role in reducing friction. Meanwhile, the uniformly distributed WC ceramic particles play a supporting and protective role for the iron matrix during the friction and wear process. As a result, the material has excellent friction and wear performance and can be used as a component material under harsh friction and wear service conditions, thereby improving the working efficiency and life of the components.

[0024] (2) The method of the present invention adopts a combination of stirring casting and rapid solidification with large supercooling in the liquid phase region to prepare WC ceramic particle reinforced iron-based self-lubricating wear-resistant bulk material with uniform structure. This method solves the problem that the friction and wear performance of single steel materials is limited and the particle reinforced iron-based bulk composite material is difficult to prepare. The method is simple to operate and has low production cost. Attached Figure Description

[0025] Figure 1 This is a flowchart of the preparation method of the present invention;

[0026] Figure 2 This is a scanning electron microscope image of the WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material prepared in Example 2 of this invention;

[0027] Figure 3 This is a characterization of the wear surface morphology of the WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material prepared in Example 2 of the present invention. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0029] This invention relates to a WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material, which is formed by adding WC powder to molten iron. The material's microstructure consists of WC ceramic particles and spheroidal graphite uniformly distributed within an iron matrix. The molten iron is composed of scrap steel, virgin iron, ferrosilicon, a carburizing agent, an inoculant, and a spheroidizing agent, and is composed of the following raw material components by mass percentage: C: 3.4%–3.7%, Si: 2.4%–2.8%, Mn: ≤0.6%, S: ≤0.02%, P: ≤0.1%, Mg: 0.02%–0.04%, Re: 0.02%–0.04%, with the balance being Fe and unavoidable impurities. Furthermore, the added WC powder accounts for 10%–40% of the total mass of the WC powder and molten iron.

[0030] The present invention relates to a method for preparing a WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material, such as... Figure 1 As shown, please follow these steps:

[0031] Step 1: Melting of ingredients and raw materials:

[0032] Calculate and prepare each raw material according to the above-mentioned raw material composition, including: scrap steel, virgin iron, ferrosilicon, carbonizer, inoculant, spheroidizing agent and WC powder; then put the weighed scrap steel, virgin iron, ferrosilicon and carbonizer into a medium frequency induction furnace and heat to melt into molten iron.

[0033] The primary iron is bread iron, with a melting temperature of 1570–1650℃ and a holding time of 2–4 minutes.

[0034] The spheroidizing agent is Si-Mg-Ca-Re, which is composed of the following raw material components by mass percentage: Si: 43-47%, Mg: 5.7-6.1%, Ca: 2.5-2.8%, Re: 0.9-1.1%, with the balance being Fe and unavoidable impurities; the amount of spheroidizing agent prepared accounts for 1.0-1.2% of the total mass of molten iron, and ensures that the residual Mg content in the prepared bulk material is 0.02-0.04%.

[0035] The inoculant is Si-Ba-Ca, which is composed of the following raw material components by mass percentage: Si: 66-69%, Ba: 3.9-4.0%, Ca: 1.3-1.7%, with the balance being Fe and unavoidable impurities; the amount of inoculant is 0.6-0.8% of the total mass of molten iron.

[0036] Step 2: Pour the molten iron obtained in Step 1 into a ladle that has been pre-lined with spheroidizing agent, inoculant and covered with iron filings for spheroidizing and inoculation treatment. After spheroidizing and inoculation treatment, the temperature of the molten iron is controlled at 1520-1580℃.

[0037] The spheroidizing agent is placed at the bottom of the ladle, and then covered with inoculant and iron filings.

[0038] Step 3: Disperse the WC casting powder through a sieve into the molten iron in Step 2 while stirring to ensure uniform dispersion. During this process, the temperature of the WC ceramic particles and the molten iron mixture is controlled at 1350-1400℃.

[0039] Step 4: Quickly pour the WC and molten iron mixture obtained in Step 3 into a crystallizer with a water-cooled graphite inner sleeve;

[0040] Step 5: Keep the WC and molten iron mixture in the crystallizer for 1-3 minutes, then quickly pull out the crystallizer and continue to solidify. After complete solidification, a WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material is obtained.

[0041] Example 1

[0042] Step 1: The molten iron composition is C: 3.5%, Si: 2.4%, Mn: ≤0.3%, S: ≤0.02%, P: ≤0.1%, Mg: 0.02%, Re: 0.02%, with the balance being Fe and unavoidable impurities. The spheroidizing agent accounts for 1.0% of the total mass of the molten iron, and its composition is Si: 45%, Mg: 6%, Ca: 2.5%, Re: 1.0%, with the balance being Fe and unavoidable impurities. The inoculant accounts for 0.6% of the total mass of the molten iron, and its composition is Si: 66%, Ba: 4.0%, Ca: 1.5%, with the balance being Fe and unavoidable impurities. The WC powder has a particle size of 80–100 μm and its mass is 10% of the total mass of the WC powder and molten iron.

[0043] Calculate and prepare various raw materials according to the mass percentage: scrap steel, bread iron, ferrosilicon, carburizing agent, inoculant, spheroidizing agent and WC powder; put the weighed scrap steel, bread iron, ferrosilicon and carburizing agent into a medium frequency induction furnace and heat to 1570℃ and hold for 3 minutes to melt them into molten iron.

[0044] Step 2: Pour the molten iron obtained in Step 1 into a ladle that has been pre-lined with spheroidizing agent, inoculant and covered with iron filings for spheroidizing and inoculation treatment. After spheroidizing and inoculation treatment, the temperature of the molten iron is controlled at 1520℃.

[0045] Step 3: Disperse the WC powder through a sieve into the molten iron in Step 2 while stirring to ensure even dispersion. During the process, the temperature of the WC ceramic particles and molten iron mixture is controlled at 1400℃.

[0046] Step 4: Quickly pour the WC and molten iron mixture obtained in Step 3 into a crystallizer with a water-cooled graphite inner sleeve;

[0047] Step 5: Keep the WC and molten iron mixture in the crystallizer for 1 minute, then quickly pull out the crystallizer and continue to solidify. After complete solidification, a WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material is obtained.

[0048] Example 2

[0049] Step 1: The molten iron composition is C: 3.6%, Si: 2.5%, Mn: ≤0.3%, S: ≤0.02%, P: ≤0.1%, Mg: 0.02%, Re: 0.03%, with the balance being Fe and unavoidable impurities. The spheroidizing agent accounts for 1.2% of the total mass of the molten iron, and its composition is Si: 43%, Mg: 6%, Ca: 2.5%, Re: 1.0%, with the balance being Fe and unavoidable impurities. The inoculant accounts for 0.8% of the total mass of the molten iron, and its composition is Si: 69%, Ba: 4.0%, Ca: 1.7%, with the balance being Fe and unavoidable impurities. The WC powder has a particle size of 53–75 μm and its mass accounts for 20% of the total mass of the WC powder and molten iron.

[0050] Calculate and prepare various raw materials according to the mass percentage: scrap steel, bread iron, ferrosilicon, carburizing agent, inoculant, spheroidizing agent and WC powder; put the weighed scrap steel, bread iron, ferrosilicon and carburizing agent into a medium frequency induction furnace and heat to 1600℃ and hold for 3 minutes to melt them into molten iron.

[0051] Step 2: Pour the molten iron obtained in Step 1 into a ladle that has been pre-lined with spheroidizing agent, inoculant and covered with iron filings for spheroidizing and inoculation treatment. After spheroidizing and inoculation treatment, the temperature of the molten iron is controlled at 1540℃.

[0052] Step 3: Disperse the WC powder through a sieve into the molten iron in Step 2 while stirring to ensure even dispersion. During the process, the temperature of the WC ceramic particles and molten iron mixture is controlled at 1390℃.

[0053] Step 4: Quickly pour the WC and molten iron mixture obtained in Step 3 into a crystallizer with a water-cooled graphite inner sleeve;

[0054] Step 5: Keep the WC and molten iron mixture in the crystallizer for 2 minutes, then quickly pull out the crystallizer and continue to solidify. After complete solidification, a WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material is obtained.

[0055] like Figure 2 The image shown is a scanning electron microscope image of the bulk material prepared in this embodiment. It can be seen that this embodiment successfully prepared an iron-based bulk material reinforced with WC ceramic particles and spherical graphite, and both WC ceramic particles and spherical graphite are uniformly distributed in the iron matrix.

[0056] The tribological properties of the bulk material prepared in this embodiment were tested under the following conditions: load 20 N, grinding time 40 min. The measured coefficient of friction was 0.38, and the wear rate was 2 × 10⁻⁶. -6 mm 3 / N·m, the material surface after friction and wear, as shown Figure 3 As shown, WC particles provide excellent protection and support for the iron matrix, while graphite plays a certain self-lubricating role. This result indicates that the material has excellent tribological properties.

[0057] Example 3

[0058] Step 1: The molten iron composition is C: 3.7%, Si: 2.6%, Mn: ≤0.3%, S: ≤0.02%, P: ≤0.1%, Mg: 0.03%, Re: 0.04%, with the balance being Fe and unavoidable impurities. The spheroidizing agent accounts for 1.0% of the total mass of the molten iron, and its composition is Si: 47%, Mg: 6%, Ca: 2.8%, Re: 1.0%, with the balance being Fe and unavoidable impurities. The inoculant accounts for 0.8% of the total mass of the molten iron, and its composition is Si: 69%, Ba: 4.0%, Ca: 1.5%, with the balance being Fe and unavoidable impurities. The WC powder has a particle size of 25–50 μm and its mass accounts for 30% of the total mass of the WC powder and molten iron.

[0059] Calculate and prepare various raw materials according to the mass percentage: scrap steel, bread iron, ferrosilicon, carburizing agent, inoculant, spheroidizing agent and WC powder; put the weighed scrap steel, bread iron, ferrosilicon and carburizing agent into a medium frequency induction furnace and heat to 1620℃ and hold for 3 minutes to melt them into molten iron.

[0060] Step 2: Pour the molten iron obtained in Step 1 into a ladle that has been pre-lined with spheroidizing agent, inoculant and covered with iron filings for spheroidizing and inoculation treatment. After spheroidizing and inoculation treatment, the temperature of the molten iron is controlled at 1560℃.

[0061] Step 3: Disperse the WC powder through a sieve into the molten iron in Step 2 while stirring to ensure even dispersion. During the process, the temperature of the WC ceramic particles and molten iron mixture is controlled at 1370℃.

[0062] Step 4: Quickly pour the WC and molten iron mixture obtained in Step 3 into a crystallizer with a water-cooled graphite inner sleeve;

[0063] Step 5: Keep the WC and molten iron mixture in the crystallizer for 2.5 minutes, then quickly pull out the crystallizer and continue to solidify. After complete solidification, a WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material is obtained.

[0064] Example 4

[0065] Step 1: The molten iron composition is C: 3.6%, Si: 2.8%, Mn: ≤0.3%, S: ≤0.02%, P: ≤0.1%, Mg: 0.03%, Re: 0.03%, with the balance being Fe and unavoidable impurities. The spheroidizing agent accounts for 1.0% of the total mass of the molten iron, and its composition is Si: 45%, Mg: 6%, Ca: 2.5%, Re: 1.0%, with the balance being Fe and unavoidable impurities. The inoculant accounts for 0.6% of the total mass of the molten iron, and its composition is Si: 66%, Ba: 4.0%, Ca: 1.5%, with the balance being Fe and unavoidable impurities. The WC powder has a particle size of 1–20 μm and its mass accounts for 40% of the total mass of the WC powder and molten iron.

[0066] Calculate and prepare various raw materials according to the mass percentage: scrap steel, bread iron, ferrosilicon, carburizing agent, inoculant, spheroidizing agent and WC powder; put the weighed scrap steel, bread iron, ferrosilicon and carburizing agent into a medium frequency induction furnace and heat to 1650℃ and hold for 3 minutes to melt them into molten iron.

[0067] Step 2: Pour the molten iron obtained in Step 1 into a ladle that has been pre-lined with spheroidizing agent, inoculant and covered with iron filings for spheroidizing and inoculation treatment. After spheroidizing and inoculation treatment, the temperature of the molten iron is controlled at 1580℃.

[0068] Step 3: Disperse the WC powder through a sieve into the molten iron in Step 2 while stirring to ensure even dispersion. During the process, the temperature of the WC ceramic particles and molten iron mixture is controlled at 1350℃.

[0069] Step 4: Quickly pour the WC and molten iron mixture obtained in Step 3 into a crystallizer with a water-cooled graphite inner sleeve;

[0070] Step 5: Keep the WC and molten iron mixture in the crystallizer for 3 minutes, then quickly pull out the crystallizer and continue to solidify. After complete solidification, a WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material is obtained.

[0071] The method of this invention successfully introduces a uniformly distributed spherical graphite self-lubricating phase and a WC ceramic particle hard phase into an iron matrix through a simple and low-cost stirring casting and liquid phase supercooling rapid solidification method. This produces a WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material with uniform structure. This material has both self-lubricating and high wear resistance properties and can be applied to harsh friction and wear service conditions to improve the working efficiency and life of parts.

Claims

1. A method for preparing WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material, characterized in that, The specific steps are as follows: Step 1: Weigh the molten iron raw materials and micron-sized WC powder. The molten iron raw materials include: scrap steel, virgin iron, ferrosilicon, carbon refining agent, inoculant and spheroidizing agent. Then heat and melt the weighed scrap steel, virgin iron, ferrosilicon and carbon refining agent into molten iron. Step 2: Pour molten iron into a ladle that has been pre-lined with spheroidizing agent, inoculant and covered with iron filings at the bottom for spheroidizing and inoculation treatment; Step 3: Disperse the WC powder through a sieve and add it to the molten iron in Step 2; Step 4: Quickly pour the WC and molten iron mixture obtained in Step 3 into a crystallizer with a water-cooled graphite inner sleeve; Step 5: Keep the mixed melt in the crystallizer for 1-3 minutes, then quickly pull out the crystallizer and continue to solidify. After complete solidification, WC ceramic particle reinforced iron-based self-lubricating wear-resistant bulk material is obtained. The mass percentages of each element in the molten iron raw material in step 1 are as follows: C: 3.4%~3.7%, Si: 2.4%~2.8%, Mn: ≤0.6%, S: ≤0.02%, P: ≤0.1%, Mg: 0.02%~0.04%, Re: 0.02%~0.04%, with the balance being Fe and unavoidable impurities; and the mass of the WC powder is 10%~40% of the total mass of the WC powder and the molten iron raw material. The heating and melting temperature in step 1 is 1570~1650℃, and the holding time is 2~4min; In step 2, the temperature of the molten iron after spheroidizing inoculation treatment is controlled at 1520~1580℃; Step 3 involves adding WC powder to the molten iron while continuously stirring, and the temperature of the WC and molten iron mixture should be controlled at 1350~1400℃.

2. The preparation method of the WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material according to claim 1, characterized in that, In step 1, the primary iron is bread iron.

3. The method for preparing the WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material according to claim 1, characterized in that, In step 1, the spheroidizing agent is Si-Mg-Ca-Re, which is composed of the following raw material components by mass percentage: Si: 43~47%, Mg: 5.7~6.1%, Ca: 2.5~2.8%, Re: 0.9~1.1%, with the balance being Fe and unavoidable impurities; the amount of spheroidizing agent prepared accounts for 1.0~1.2% of the total mass of the molten iron raw material.

4. The method for preparing the WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material according to claim 1, characterized in that, In step 1, the inoculant is Si-Ba-Ca, which is composed of the following raw material components by mass percentage: Si: 66~69%, Ba: 3.9~4.0%, Ca: 1.3~1.7%, with the balance being Fe and unavoidable impurities; the amount of inoculant prepared accounts for 0.6~0.8% of the total mass of the molten iron raw material.

5. The method for preparing the WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material according to claim 1, characterized in that, In step 2, the spheroidizing agent is laid at the bottom of the ladle, and then covered with inoculant and iron filings in sequence.

6. The WC ceramic particle-reinforced iron-based self-lubricating wear-resistant bulk material prepared according to any one of claims 1-5, characterized in that, The material is composed of WC ceramic particles and spherical graphite uniformly distributed in an iron matrix.

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