A method for producing a graphite fiber / iron-based composite material using a continuous casting process

Abstract

This invention discloses a method for preparing graphite fiber / iron-based composite materials using continuous casting, belonging to the field of heavy-duty friction-reducing composite material preparation technology. The preparation method includes the following steps: molten iron pretreatment, graphite fiber surface coating, and drawing. Continuous casting is a mature industrial technology that enables continuous production, significantly saving production time. Simultaneously, the billet can be made into different lengths as needed, facilitating subsequent processing. This invention aims to improve the bonding ability between the fiber surface and the molten metal through electroplating, while controlling the fiber diameter, ultimately extruding the graphite fibers into the molten metal and drawing them through continuous casting. Graphite is a cost-effective solid self-lubricating medium. The presence of continuous and discontinuous graphite fibers within the metal matrix allows it to form a lubricating film during service, thereby exerting a good friction-reducing effect and significantly improving the service life and operational stability of equipment components.

Description

Technical Field

[0001] This invention relates to a method for preparing graphite fiber / iron-based composite materials using a continuous casting process, belonging to the field of heavy-duty friction-reducing composite material preparation technology. Background Technology

[0002] Heavy-duty machinery is a vital sector of my country's national economy, encompassing metallurgical rolling mill equipment, filling equipment, water turbines, gas turbines, instrumentation, mining machinery, shipbuilding machinery, textile machinery, aerospace, and marine industries. These machines must withstand harsh working environments including high temperatures, heavy loads, dust, water exposure, and impact vibrations. Furthermore, the lubrication performance during operation directly impacts the overall performance of the equipment. Therefore, it is necessary to conduct further in-depth research on lubrication technology theories that play a crucial role in improving product quality, extending the service life of machinery, and enhancing its reliability.

[0003] As modern machinery develops towards higher speeds, higher loads, higher power transmission, and energy efficiency, the performance requirements for heavy-duty machinery are becoming increasingly stringent. Some heavy-duty equipment not only operates under harsh conditions but also in dusty environments. Ordinary liquid lubrication, due to its limited frictional characteristics, cannot meet the demands of these special working conditions. Solid self-lubricating technology completely overcomes the limitations of grease lubrication, achieving oil-free lubrication. This technology has become the current trend in lubrication technology, and the development of metal-based self-lubricating composite materials with high mechanical strength and good tribological properties has become a major focus in the field of tribology. Currently, adding appropriate amounts of graphite or molybdenum disulfide to the matrix material as a solid lubricant is widely used. Under continuous extrusion and friction from external forces, the graphite or molybdenum disulfide in the matrix is ​​extruded, forming a lubricating film on the matrix surface to help resist friction from external sources. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing graphite / iron-based composite materials using a continuous casting process. The method involves pretreating molten iron to obtain refined molten metal, pouring it into a tundish, immersing surface-coated graphite fibers in the molten metal under pressure, and then drawing them out through a crystallizer and ingot tube to obtain the graphite fiber / iron-based composite material. Specifically, the method includes the following steps:

[0005] (1) Graphite fiber surface coating: Graphite fibers are immersed in pure water to disperse them, and then the graphite fibers are placed in an electroplating solution composed of nickel sulfate, nickel chloride, boric acid and sodium dodecyl sulfate to electroplating, resulting in graphite fiber bundles with nickel plating on the surface.

[0006] (2) Iron pretreatment: The iron-based raw materials are placed in a crucible and heated to 1570℃~1700℃ to melt. After the raw materials are completely melted, they are transferred to a ladle for argon blowing and stirring to remove impurities and desulfurize, so as to obtain a relatively pure molten metal.

[0007] (3) Drawing process: The refined molten metal in step (2) is poured into the intermediate ladle. The molten metal is kept at 1530-1630℃ by the induction coil so that the molten metal can have good fluidity. After flowing to the other side through the molten metal partition, the piston on the right side continuously pushes the nickel-plated graphite fiber obtained in step (1) from the crucible cylinder into the molten metal under pressure. As the graphite fiber is immersed in the molten metal, after passing through the crystallizer, a solid-liquid coexisting billet is obtained. Finally, under the action of the traction device, the billet wrapped with graphite fiber is pulled out by the ingot tube to obtain graphite fiber / iron-based composite material.

[0008] Preferably, the graphite fibers in step (1) are graphite fiber bundles with a diameter of 0.1–1 mm, a single filament diameter of 5–10 μm, and a density of 1.77–1.82 g / cm³. 3 The graphite fiber accounts for 20% of the matrix volume fraction. Graphite fiber is selected because the fiber can be formed by crucible pull-down method. The electroplating is continuous electroplating, and the plating process is fully automated. The speed is 2 to 20 μm / h, the nickel plating time is 20 to 30 min, and the electroplating temperature is 30 to 40℃.

[0009] Preferably, the soaking time in step (1) is 1 to 2 hours.

[0010] Preferably, in step (1), the main salt in the electroplating solution is 240–260 g / L nickel sulfate (NiSO4·6H2O), the anode activator is 43–47 g / L nickel chloride (NiCl2·6H2O), the buffer is 28–32 g / L boric acid (H3BO3), and the wetting agent is 0.15–0.35 g / L sodium dodecyl sulfate (C 12 H 25 SO4Na).

[0011] Preferably, the composition and mass percentage of the iron-based raw material in step (2) are: Cr: 25%~30%, Ni: 5%~10%, C: 0.15%~0.45%, Mn: 0.2%~0.5%, Si: 0.3%~0.6%, Ti: 0.2%~0.4%, Mo: 0.1%~0.2%, Cu: 0.05%~0.1%. Apart from the above alloying elements, the rest are unavoidable impurities.

[0012] Preferably, the argon blowing and stirring for impurity removal in step (2) is bottom blowing, with an argon blowing rate of 1.2 to 3.5 NL / min and an argon blowing time of 15 to 30 min.

[0013] Preferably, in step (3), one side of the intermediate ladle is for pouring refined molten metal into the ladle, and the other side is for placing the piston. The size of the other side matches the size of the piston to ensure the sealing of the intermediate ladle.

[0014] Preferably, the size of the molten metal baffle in step (3) is between 70 and 100 mm. The function of the baffle is to reduce the impact of the molten metal, allowing it to flow slowly into the other side of the tundish and reduce the agglomeration effect on the graphite fibers. The diameter of the crucible cylinder for extruding the graphite fibers should be consistent with the diameter of the mold. At the same time, there are two layers of evenly distributed circular holes inside the cylinder, with a diameter of 0.15 to 1.2 mm. The pressure of the piston extruding the graphite fibers is 5 to 10 MPa. The pulling speed of the traction device for pulling the billet is 0.35 m / min to 0.65 m / min.

[0015] The beneficial effects of this invention are reflected in:

[0016] (1) Currently, the addition of graphite and other media to composite materials as solid lubricants is widely used. However, the content and morphology of graphite have a significant impact on the performance of composite materials. Adding an appropriate amount of graphite fiber to the matrix has a good friction-reducing effect. At the same time, the distribution of different fiber diameters in the matrix also has an important impact on the overall performance and internal structural defects of the matrix. In this invention, graphite fibers are immersed in refined molten metal. Finally, the molten metal encapsulates the graphite fibers in the form of a solid-liquid coexisting billet, which is then pulled out by a traction device to obtain a graphite / iron-based composite material. This method greatly simplifies the traditional process for producing composite materials and solves the problem of non-uniformity in the production of graphite fibers using continuous casting.

[0017] (2) The addition of electroplated graphite fibers to the iron-based matrix reduces the wetting angle between the graphite fibers and the molten metal, thus improving their bonding ability. Heavy-duty mechanical components made from graphite fiber / iron-based composite materials produced by this method, when operating under high-speed, heavy-load, and high-power environments, will have a uniform lubricating film formed on their surface by the continuous and discontinuous graphite fibers evenly distributed in the matrix. This provides excellent friction reduction and significantly improves the service life and operational stability of equipment components.

[0018] (3) Compared with chemical plating, the electroplating method used in this invention has relatively low cost, can achieve continuous production, and the coating quality is firm and stable. The electroplating waste liquid can be recycled, making it an important choice for carbon fiber surface coating process.

[0019] (4) In this invention, Cr and Ni elements in the iron-based raw material composition serve as the main wear-resistant elements of the matrix, effectively improving the strength, hardness, oxidation resistance, and corrosion resistance of the matrix. A small amount of Cr and Ni elements dissolved in the matrix does not provide good wear resistance, resulting in excessive wear during service, which in turn affects the working stability of the equipment and the production efficiency of the products. Therefore, the content of Cr and Ni elements is controlled at 25%–30% and 5%–10%, respectively. The presence of C elements can effectively improve the hardness of the matrix material, but excessive C content will increase the brittleness of the matrix. Therefore, the content of C elements is controlled at 0.15%–0.45%. An appropriate amount of silicon can effectively improve the tensile strength of the matrix, and when combined with alloying elements such as molybdenum, it can effectively improve the oxidation resistance. The addition of Ti and Mo elements can refine the grains and improve the density of the matrix. The addition of an appropriate amount of Cu elements can improve the strength and ductility of the matrix. Its content is controlled at 0.3%–0.8%. The above alloying elements are added to the matrix in proportion to give it good comprehensive mechanical properties.

[0020] (5) Compared with conventional casting processes, the continuous casting process described in this invention has the advantage of enabling continuous production without stopping the machine to change molds, effectively improving production efficiency. Furthermore, the billet can be made into different lengths as needed, facilitating subsequent processing. Simultaneously, the addition of the piston on the right side allows for the uniform incorporation of reinforcements in fiber-like forms into the matrix, resulting in various types of composite materials. The graphite fiber / iron-based composite material obtained by this process has high density, few internal structural defects, and can withstand harsh service conditions. Even if some graphite fibers break within the matrix during the drawing process, their overall internal uniformity remains unaffected.

[0021] (6) This invention achieves good bonding by pressing graphite fibers into molten metal using a piston. This method effectively solves the problem of how to add reinforcing materials such as graphite fibers to the matrix material, and also cleverly solves the problem of uneven distribution of graphite fibers in the matrix. On the other hand, the speed at which graphite fibers are pressed into the molten metal can be controlled according to the pressure, making the operation very flexible and controllable.

[0022] (7) The heavy-duty mechanical parts manufactured by the method described in this invention have uniformly distributed continuous and discontinuous graphite fibers in their matrix. When facing high-speed and high-load operating conditions, the graphite lubricating film formed on the surface of the matrix can play a good role in reducing friction, reducing the wear rate of the heavy-duty mechanical parts, effectively improving their service life and working stability, and increasing production efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the continuous casting process;

[0024] Figure 2Schematic diagram of graphite fibers distributed in the matrix after drawing;

[0025] Figure 3 Schematic diagram of average Vickers hardness of the examples and comparative examples;

[0026] Figure 4 Schematic diagram of graphite fiber bundles dispersed in the matrix. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention, but the scope of protection of the present invention is not limited to the content described herein.

[0028] Example 1

[0029] A method for preparing graphite fiber / iron-based composite materials using continuous casting process, the schematic diagram of which is shown below. Figure 1 As shown, its preparation method includes the following steps:

[0030] (1) Graphite fiber surface coating: 0.1 mm diameter graphite fiber bundles are immersed in pure water for 1 h to disperse them, and then placed in a nickel plating bath with a concentration of 240 g / L nickel sulfate, 43 g / L nickel chloride, 28 g / L boric acid and 0.15 g / L sodium dodecyl sulfate, and plated in the electroplating solution at a temperature of 30 °C for 20 min at a speed of 2 μm / h.

[0031] (2) Pretreatment of molten iron: The raw materials, intermediate alloys, or iron ore are added to the crucible in a certain proportion and heated to 1570°C by the high temperature of the electric arc. After the material is completely melted, it is poured into a ladle and argon gas with a flow rate of 1.2 NL / min is introduced for 15 min to remove impurities and desulfurize, so that impurities and harmful elements in the molten metal are gradually removed. In this embodiment, the mass percentage of iron-based components is: Cr: 25%, Ni: 10%, C: 0.15%, Mn: 0.2%, Si: 0.5%, Ti: 0.2%, Mo: 0.1%, Cu: 0.05%, with the balance being Fe. Apart from the above-mentioned elements, the rest are unavoidable impurities.

[0032] (3) Drawing process: The refined molten metal is poured into an intermediate ladle and kept at 1530℃ by an induction coil to ensure good fluidity. After flowing through the molten metal partition to the other side, the piston on the right side continuously pushes graphite fibers with a diameter of 0.1 mm into the molten metal through evenly distributed circular holes of 0.15 mm under a pressure of 5 MPa. As the graphite fibers are immersed in the molten metal, a solid-liquid coexisting billet is obtained after passing through the crystallizer. Finally, under the action of the traction device, the billet, wrapped with graphite fibers, is drawn out at a drawing speed of 0.35 m / min to obtain the graphite fiber / iron-based composite material. A schematic diagram of the distribution of graphite fibers in the matrix after drawing is shown below. Figure 2 A schematic diagram of graphite fiber bundles dispersed in the matrix is ​​shown below. Figure 4 .

[0033] In this embodiment, the diameter of the graphite fiber bundle is 0.1 mm. A relatively uniform nickel layer is plated on the fiber surface by electroplating, resulting in good bonding strength with the matrix. The fibers inside the matrix are not easily broken during drawing. Finally, the material exhibits certain self-lubricating properties during service, thus achieving a certain friction reduction effect.

[0034] Example 2

[0035] A method for preparing graphite fiber / iron-based composite materials using a continuous casting process, the preparation method comprising the following steps:

[0036] (1) Graphite fiber surface coating: 0.5 mm diameter graphite fiber bundles are immersed in pure water for 1.5 h to disperse them, and then placed in a nickel plating bath with a concentration of 250 g / L nickel sulfate, 45 g / L nickel chloride, 30 g / L boric acid and 0.25 g / L sodium dodecyl sulfate, and plated in the electroplating solution at a temperature of 35 °C for 25 min at a speed of 10 μm / h.

[0037] (2) Hot metal pretreatment: Raw materials, intermediate alloys, or iron ore are added to a crucible in a certain proportion, and the raw materials are heated to 1635℃ by the high temperature of an electric arc. After the material is completely melted, it is poured into a ladle and argon gas is introduced at a flow rate of 2.5 NL / min for 15 minutes to remove impurities and desulfurize, so that impurities and harmful elements in the molten metal are gradually removed. In this embodiment, the mass percentage of the iron-based components is: Cr: 28%, Ni: 8%, C: 0.3%, Mn: 0.3%, Si: 0.4%, Ti: 0.3%, Mo: 0.15%, Cu: 0.08%, with the balance being Fe. Apart from the above-mentioned elements, the rest are unavoidable impurities.

[0038] (3) Drawing process: The refined molten metal is poured into the tundish and kept at 1625℃ by the induction coil to make the molten metal have good fluidity. After flowing to the other side through the molten metal partition, the piston on the right side continuously pushes the graphite fiber with a diameter of 0.5mm into the molten metal through the uniformly distributed circular holes of 0.55mm under the action of 8MPa pressure. As the graphite fiber is immersed in the molten metal, after passing through the crystallizer, a solid-liquid coexisting billet is obtained. Finally, under the action of the traction device, the billet wrapped with graphite fiber is pulled out at a drawing speed of 0.5m / min to obtain graphite fiber / iron-based composite material.

[0039] In this embodiment, the graphite fiber bundle has a diameter of 0.5 mm. A uniform and strong nickel layer is plated on the surface of the graphite fiber, which greatly improves the bonding force when immersed in molten metal. At the same time, the larger fiber bundle diameter allows for more uniform distribution in the molten metal, reducing agglomeration. When drawn out at a faster speed, the billet quality is higher, the draw-out rate is significantly reduced, the billet density is higher, and there are fewer internal defects. It operates stably during service and achieves a good friction-reducing effect.

[0040] Example 3

[0041] A method for preparing graphite fiber / iron-based composite materials using a continuous casting process, the preparation method comprising the following steps:

[0042] (1) Graphite fiber surface coating: 1 mm diameter graphite fiber bundles are immersed in pure water for 2 hours to disperse them, and then placed in a nickel plating bath with a concentration of 260 g / L nickel sulfate, 47 g / L nickel chloride, 32 g / L boric acid and 0.35 g / L sodium dodecyl sulfate, and plated in the electroplating solution at a temperature of 40 °C for 30 minutes at a speed of 20 μm / h.

[0043] (2) Hot metal pretreatment: Raw materials, intermediate alloys, or iron ore are added to a crucible in a certain proportion, and the raw materials are heated to 1700℃ by the high temperature of an electric arc. After the materials are completely melted, they are poured into a ladle and argon gas is introduced at a flow rate of 3.5 NL / min for 30 minutes to remove impurities and desulfurize, so that impurities and harmful elements in the molten metal are gradually removed. In this embodiment, the mass percentage of the iron-based components is: Cr: 30%, Ni: 5%, C: 0.45%, Mn: 0.5%, Si: 0.6%, Ti: 0.4%, Mo: 0.2%, Cu: 0.1%, with the balance being Fe. Apart from the above-mentioned elements, the rest are unavoidable impurities.

[0044] (3) Drawing process: The refined molten metal is poured into the tundish and kept at 1635℃ by the induction coil to make the molten metal have good fluidity. After flowing to the other side through the molten metal partition, the piston on the right side continuously pushes the graphite fiber with a diameter of 1mm into the molten metal through the uniformly distributed circular holes of 1.2mm under the action of 10MPa pressure. As the graphite fiber is immersed in the molten metal, after passing through the crystallizer, a solid-liquid coexisting billet is obtained. Finally, under the action of the traction device, the billet wrapped with graphite fiber is pulled out at a drawing speed of 0.65m / min to obtain graphite fiber / iron-based composite material.

[0045] In this embodiment, the nickel plating effect of the graphite fiber is still good, with a uniform and firm nickel layer. At the same time, the diameter of the graphite fiber bundle is increased to 1 mm. Although the number of the bundles in the matrix is ​​reduced, the drawn graphite fiber / iron-based composite material still has a certain self-lubricating property and achieves the expected friction reduction effect.

[0046] Comparative Example 1

[0047] The difference between this comparative example and Example 2 is that this process uses a traditional casting method to prepare the graphite fiber / iron-based composite material. The specific steps are as follows:

[0048] (1) Graphite fiber surface coating: 0.5 mm diameter graphite fiber bundles are immersed in pure water for 1.5 h to disperse them, and then placed in a nickel plating bath with a concentration of 250 g / L nickel sulfate, 45 g / L nickel chloride, 30 g / L boric acid and 0.25 g / L sodium dodecyl sulfate, and plated in the electroplating solution at a temperature of 35 °C for 25 min at a speed of 10 μm / h.

[0049] (2) Hot metal pretreatment: Raw materials, intermediate alloys, or iron ore are added to a vacuum induction melting furnace in a certain proportion. The raw materials are heated to 1635℃ by the high temperature of the electric arc for melting. Argon gas is introduced as a protective gas, and the furnace is kept in a vacuum of 4.5 × 10⁻⁶. -2 At Pa, alloying elements such as ferrosilicon and ferromanganese are added as deoxidizers to gradually remove impurities and oxides from the steel. In this comparative example, the mass percentage of the iron-based components is: Cr: 28%, Ni: 8%, C: 0.3%, Mn: 0.3%, Si: 0.4%, Ti: 0.3%, Mo: 0.15%, Cu: 0.08%, with the balance being Fe. Apart from the above elements, the remainder are unavoidable impurities.

[0050] (3) Preparation of composite material: The nickel-plated graphite fiber is mixed with the refined molten metal and poured into a graphite mold, and then cooled naturally to room temperature.

[0051] In this comparative example, the graphite fiber / iron-based composite material made by traditional casting process tends to float on the surface of the molten metal when mixed with it due to the low density of the graphite fibers. At the same time, the graphite fibers will also agglomerate during stirring, which will prevent the graphite fibers from being evenly distributed in the matrix, increase internal defects in the matrix, and result in low density. This has a significant impact on the use of the material and may pose potential risks to the overall operation of the equipment.

[0052] Comparative Example 2

[0053] In comparison, the materials and amounts used in this comparative example are the same as those in Example 2, except that the graphite fiber surface is not coated.

[0054] In this comparative example, the graphite fiber / iron-based composite material exhibited poor overall performance during service. The main reason was that the graphite fibers were not surface-coated, resulting in poor bonding strength between the fibers and the matrix. Furthermore, since graphite fibers are relatively soft, they were easily broken during the drawing process due to the lack of a uniform coating on their surface. Consequently, most of the graphite fibers inside the matrix were discontinuous, preventing the mating surfaces from maintaining a uniform lubricating film to reduce the intense friction between the mating parts during service. This resulted in poor friction reduction and affected the normal operation of the equipment.

[0055] Comparative Example 3

[0056] In comparison, the materials and amounts used in this comparative example are the same as those in Example 2, except that the molten iron is not pretreated.

[0057] In this comparative example, the obtained graphite fiber / iron-based composite material exhibited poor performance and failed to meet the requirements for product use. The main reason for this was the lack of pretreatment of the molten iron before subsequent use, which resulted in the retention of elements such as phosphorus and sulfur, which are detrimental to the material's properties. This significantly reduced the material's quality and performance, rendering it unusable. Therefore, pretreatment of molten iron to improve material quality is essential.

[0058] Friction and hardness tests were performed on the iron-based composite materials obtained in the examples and comparative examples. The results of the friction tests are shown in Table 1. The hardness test results are as follows: Figure 3 As shown,

[0059] Table 1 Comparison of performance parameters between the examples and comparative examples.

[0060]

[0061] Table 1 above shows the data for dry sliding friction under a load of 150N for 5 hours. From this table and... Figure 3It is understood that the method described in this invention can obtain iron-based composite materials with the best performance, effectively extend the service life of heavy-duty machinery and equipment, and thus improve the production efficiency of products.

Claims

1. A method for producing a graphite fiber / iron-based composite material using a continuous casting process, characterized by: The molten iron is pretreated to obtain the refined metal liquid, and the graphite fiber bundle coated on the surface is immersed in the metal liquid to be drawn into shape to obtain the graphite fiber / iron-based composite material; The specific method comprises the following steps: (1) Surface plating of graphite fiber bundle: the graphite fiber bundle is immersed in pure water to be dispersed, and then the graphite fiber bundle is placed in an electroplating solution composed of nickel sulfate, nickel chloride, boric acid and sodium dodecyl sulfate to be electroplated to obtain the graphite fiber bundle coated with nickel on the surface; the diameter of the graphite fiber bundle is 0.1-1 mm; (2) Pretreatment of molten iron: the iron-based raw material is placed in a crucible and heated to 1570-1700 DEG C to be melted, and after the raw material is completely melted, it is transferred into a ladle to be stirred and deoxidized by argon blowing to obtain the metal liquid; (3) Drawing process: the refined metal liquid in step (2) is poured into a tundish, the metal liquid is kept at 1530-1630 DEG C by an induction coil to have fluidity, after the metal liquid flows into the right side through a metal liquid partition, the nickel-coated graphite fiber bundle obtained in step (1) is continuously pushed into the metal liquid from the inside of the crucible cylinder under the action of the right top piston, with the graphite fiber bundle immersed in the metal liquid, the cast blank coexisting with the solid is obtained after passing through a crystallizer, and finally the cast blank is drawn out by the mold tube under the action of the traction device to obtain the graphite fiber / iron-based composite material; wherein the pressure is 5-10 MPa; the drawing speed is 0.35-0.65 m / min; In step (2), the composition and mass percentage of the iron-based raw material are as follows: Cr: 25-30%, Ni: 5-10%, C: 0.15-0.45%, Mn: 0.2-0.5%, Si: 0.3-0.6%, Ti: 0.2-0.4%, Mo: 0.1-0.2%, Cu: 0.05-0.1%, and the balance is Fe and inevitable impurities.

2. The method of manufacturing graphite fiber / iron-based composite material using continuous casting process according to claim 1, characterized in that: In step (1), the electroplating is continuous electroplating, the plating process is fully automated, the speed is 2-20 μm / h, the nickel plating time is 20-30 min, and the electroplating temperature is 30-40 DEG C.

3. The method of manufacturing graphite fiber / iron-based composite material using continuous casting process according to claim 1, characterized in that: In step (1), the immersion time is 1-2 h.

4. The method of manufacturing graphite fiber / iron-based composite material using continuous casting process according to claim 1, wherein: In step (1), the main salt in the electroplating solution is 240-260 g / L of nickel sulfate, the anode activator is 43-47 g / L of nickel chloride, the buffer is 28-32 g / L of boric acid, and the wetting agent is 0.15-0.35 g / L of sodium dodecyl sulfate.

5. The method of manufacturing graphite fiber / iron-based composite material using continuous casting process according to claim 1, wherein: In step (3), one side of the tundish is for pouring the refined metal liquid from the ladle, and the other side is for placing the piston, and the size of the other side matches the size of the piston to ensure the sealing property of the tundish.

6. The method of manufacturing graphite fiber / iron-based composite material using continuous casting process according to claim 1, wherein: In step (3), the size of the metal liquid partition is 70-100 mm; the diameter of the crucible cylinder is consistent with the diameter of the mold, and there are two layers of uniformly distributed circular holes in the inside of the cylinder, and the diameter of the circular holes is 0.15-1.2 mm.

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