End face sealing material and preparation method and application thereof

Abstract

The invention relates to the technical field of powder metallurgy, and particularly discloses an end face sealing material and a preparation method and application thereof. The end face sealing material provided by the invention is prepared from the following chemical components in percentage by weight: 6.5 to 9.0 percent of a carbon material, 19.5 to 27.0 percent of Ni, 0.15 to 0.27 percent of Al2O3, 0.1 to 0.15 percent of TiC and the balance of Cu, the carbon material is prepared from a carbon nanotube and graphene in a weight ratio of 3: (0.5-2); according to the preparation method of the end face sealing material, the surface of a carbon material needs to be coated with Ni to be prefabricated into C / Ni composite powder; the preparation method comprises the following steps: uniformly dispersing Al2O3 and TiC in a Cu matrix to prepare Al2O3 / TiC / Cu composite powder; the end face sealing material provided by the invention has the advantages of good lubricity, good wear resistance, safety, reliability, long service life and the like, and can be used as a bearing end face sealing material for a high-precision gear pump of a fuel regulator.

Description

Technical Field

[0001] This application relates to the field of powder metallurgy technology, specifically to an end-face sealing material and its preparation method and application. Background Technology

[0002] The gear pump in the fuel supply mechanism pressurizes the fuel through gear meshing. This type of gear pump has radial clearance and end face clearance during operation. Therefore, there are two fuel leaks during operation: radial leakage and end face leakage. The end face leakage accounts for more than 80% of the total leakage.

[0003] In high-precision gear pumps with stringent flow control requirements, an automatic end-face clearance compensation structure is typically employed. Under spring force, the bearing end face is tightly fitted to the gear end face, eliminating end-face leakage and preventing fuel from the high-pressure oil end from leaking into the return oil chamber through the end-face clearance. However, bearings experience wear at two points during operation: one is the clearance between the bearing bore and the outer diameter of the gear shaft, and the other is the wear between the bearing end face and the gear end face. Friction and wear occur at both points whenever the gear is in operation. Generally, the gear material is designed as high-strength medium-alloy carburized steel, with a hardness significantly greater than that of the bearing material. This ensures that during gear pump operation, wear primarily occurs at the bearing end face, reducing gear wear and protecting the gear material.

[0004] Currently, the bearing material of high-precision gear pumps for fuel regulators mainly uses surface-modified cast copper alloys. There are two main surface modification methods: one is to use lead-indium alloy diffusion electroplating technology to form a lead-indium alloy diffusion layer on the surface of cast copper. The characteristic of this coating is good lubrication performance, but the disadvantage is that the coating is relatively soft, prone to adhesive wear, and the coating is relatively thin, resulting in a short service life. The other method is to spray molybdenum disulfide onto the surface of cast copper. Molybdenum disulfide has good lubrication performance and strong wear resistance. The wear products are in powder form and are not prone to adhesive wear. However, the spraying process of this method is complicated, costly, and the coating thickness is difficult to control. The coating is prone to peeling, resulting in poor quality stability. Summary of the Invention

[0005] In order to overcome the problems of easy adhesive wear, easy peeling of coating, complicated process or short service life of bearing materials in existing high-precision gear pumps for fuel regulators, this application provides an end face sealing material and its preparation method and application.

[0006] In a first aspect, this application provides an end-face sealing material, employing the following technical solution: An end-face sealing material comprises the following chemical composition: 6.5-9.0 wt% carbon material, 19.5-27.0 wt% Ni, 0.15-0.27 wt% Al2O3, 0.1-0.15 wt% TiC, with the balance being Cu; In the preparation method of the end-face sealing material, Ni needs to be coated on the surface of carbon material to pre-form C / Ni composite powder; Al2O3 and TiC are uniformly dispersed in Cu matrix to pre-form Al2O3 / TiC / Cu composite powder.

[0007] This application provides a bearing end face sealing material with high hardness and strength, low wear rate, and the wear product, grinding chips, is powdered graphite, which has good self-lubricating properties when mixed with fuel and is not prone to adhesive wear; furthermore, this material does not have the problem of lubricant layer peeling off. Therefore, the bearing end face sealing material provided by this application has the advantages of good lubricity, excellent wear resistance, safety and reliability, and long service life, and is a high-precision gear pump bearing end face sealing material with stable and reliable quality.

[0008] In this application, a mixture of carbon nanotubes and graphene is used as the carbon material. Due to the high aspect ratio of carbon nanotubes, a continuous lubrication network can be constructed within the material, reducing the coefficient of friction and increasing its tensile strength. Graphene possesses superhydrophobic properties and interlayer sliding ability, maintaining a sealing effect in fuel media and reducing material wear. In this application, the carbon material, as the lubricating phase, is the main component forming powdery grinding chips. When the carbon content is too low, the grinding chips from the end-face sealing material become filamentous, leading to reduced lubrication performance; conversely, when the carbon content is too high, the strength of the end-face sealing material decreases, resulting in poor wear resistance. Therefore, this application controls the carbon content within the range of 6.5-9.0 wt%, enabling the material to possess both high lubrication characteristics and wear resistance, while ensuring that the grinding chips are also powdery, minimizing adhesive wear. Furthermore, due to the high carbon content and the large density difference between carbon and copper, direct mixing with copper powder can easily lead to stratification and difficulty in dispersion. Therefore, this application pre-coats the surface of the carbon material with a Ni layer, utilizing the infinite miscibility between Ni and Cu to promote uniform dispersion of the high-content carbon material in the Cu matrix. Moreover, the cupronickel formed by Ni and Cu is beneficial for matrix strengthening, greatly improving the wear resistance of the composite material.

[0009] In this application, Al2O3 serves as a wear-resistant reinforcing phase, increasing the wear resistance of the end-face sealing material. Low Al2O3 content leads to reduced wear resistance, while high content increases hardness, significantly increasing wear on the gear material. Therefore, the Al2O3 content is controlled within the range of 0.15–0.27 wt%, ensuring high wear resistance while avoiding excessive hardness. This guarantees a reliable lifespan for the end-face sealing material while reducing wear on the gear material during friction. Nano-TiC provides nucleation sites, enhancing grain refinement and significantly improving the material's strength, hardness, and wear resistance. Furthermore, since Al2O3 and TiC are prone to agglomeration, this application employs an in-situ alumina formation method using an aluminum-copper alloy to uniformly disperse alumina within the Cu matrix, ensuring diffuse reinforcement and preventing agglomeration. Al2O3 and TiC also form a composite reinforcement, suppressing agglomeration through steric hindrance, thus guaranteeing the uniformity of the end-face sealing material's microstructure. Optionally, the carbon material is carbon nanotubes and graphene in a weight ratio of 3:(1-1.5).

[0010] Optionally, the end-face sealing material comprises the following chemical composition: 7.5 wt% carbon material, 23 wt% Ni, 0.21 wt% Al2O3, 0.13 wt% TiC, with the balance being Cu.

[0011] In some embodiments, the carbon material content may be 6.5-7.5 wt%, 6.5-8.6 wt%, 6.5-9.0 wt%, 7.5-8.6 wt%, 7.5-9.0 wt%, or 8.6-9.0 wt%.

[0012] In one specific implementation, the carbon material content may also be 6.5 wt%, 7.5 wt%, 8.6 wt%, or 9.0 wt%.

[0013] In some embodiments, the Ni content may be 19.5-23 wt%, 19.5-25.8 wt%, 19.5-27.0 wt%, 23-25.8 wt%, 23-27.0 wt%, or 25.8-27.0 wt%.

[0014] In one specific embodiment, the Ni content may also be 19.5 wt%, 23 wt%, 25.8 wt%, or 27.0 wt%.

[0015] In some embodiments, the content of the Al2O3 component may be 0.15-0.21 wt%, 0.15-0.25 wt%, 0.15-0.27 wt%, 0.21-0.25 wt%, 0.21-0.27 wt%, or 0.25-0.27 wt%.

[0016] In one specific embodiment, the content of the Al2O3 component may also be 0.15wt%, 0.21wt%, 0.25wt%, or 0.27wt%.

[0017] Optionally, the C / Ni composite powder is prepared by chemical vapor deposition; the Al2O3 / TiC / Cu composite powder is prepared by internal oxidation via ODS.

[0018] Secondly, this application provides a method for preparing an end-face sealing material, comprising the following steps: preparing C / Ni composite powder, preparing Al2O3 / TiC / Cu composite powder, mixing, wax doping, molding, pre-sintering, and hot isostatic pressing; The hot isostatic pressing temperature is 20°C or more higher than the pre-sintering temperature, but does not exceed 980°C.

[0019] This application provides a method for preparing an end-face sealing material. The method involves first slowly heating the molded material for pre-sintering, and then performing hot isostatic pressing to densify it. The pre-sintering temperature is controlled to be 20°C or more lower than the hot isostatic pressing temperature, but not exceeding 980°C. On the one hand, this method can significantly reduce the problems of graphite delamination and upper layer migration in the metal matrix. On the other hand, it can also avoid the material deformation problems caused by the rapid and large-scale instantaneous migration of low-density graphite and the large shrinkage rate during the direct hot isostatic pressing process of powder and green blank. In addition, when the hot isostatic pressing temperature is 20°C or more higher than the pre-sintering temperature, it is also beneficial to improve the densification degree of the material.

[0020] Optionally, the pre-sintering adopts a five-stage heating process: First stage: Increase the temperature from room temperature to 280℃-300℃ at a rate of 5-10℃ / min and hold for 60-120 minutes; Second stage: Increase the temperature to 330-350℃ at a rate of 0.5-1℃ / min and hold for 30-60 minutes; Third stage: Increase the temperature to 380-400℃ at a rate of 1-2℃ / min and maintain the temperature for 180-210 minutes; Fourth stage: Increase the temperature to 650-700℃ at a rate of 1-2℃ / min and hold for 10-20 minutes; Fifth stage: Increase the temperature to 900-930℃ at a rate of 5-10℃ / min, apply pressure of 32-45MPa, and hold for 30-60 minutes.

[0021] Optionally, the temperature of the hot isostatic pressing is 950-980℃, the pressure is 120-170MPa, and the holding time is 3-4h.

[0022] In some implementations, the pre-sintering temperature can be 900-920°C or 920-930°C.

[0023] In one specific implementation, the pre-sintering temperature can be 900°C, 920°C, or 930°C.

[0024] In one specific implementation, the temperature of the hot isostatic pressing can be 950°C or 980°C.

[0025] Optionally, the molding pressure is 45-50 MPa, and the holding time is 10-15 s.

[0026] Optionally, the wax-addition step is as follows: add 0.05-0.10 wt% paraffin wax to the mixture and mix evenly.

[0027] In this application, by adding paraffin wax to finely adjust the C content in the material, the lubrication properties of the material can be optimized and the molding of the material can be promoted.

[0028] Thirdly, this application provides the application of an end-face sealing material in a fuel regulator gear pump.

[0029] In summary, this application has the following beneficial effects: 1. This application provides an end-face sealing material that, compared with existing end-face sealing materials, does not have the problem of lubricating layer peeling off, and has good wear resistance. The grinding chips are mainly graphene micro flakes, which have a good self-lubricating effect. Therefore, the above-mentioned end-face sealing material can be used as the bearing end-face sealing material of the high-precision gear pump of the fuel regulator, and has good safety, stability and reliability.

[0030] 2. The end-face sealing material of this application has a Brinell hardness of 62-71HB, a friction coefficient ≤0.05 under dry friction conditions, a wear amount ≤0.10wt% / h per unit time, and a compressive strength ≥600MPa.

[0031] 3. In the preparation method of the end face sealing material provided in this application, by pre-sintering with the preform after molding and then performing hot isostatic pressing, and controlling the hot isostatic pressing temperature to be 20°C or more higher than the pre-sintering temperature, the problems of carbon stratification and upper layer migration in the metal matrix can be reduced, and the material deformation problems caused by the instantaneous rapid and large-scale migration of carbon and large shrinkage rate caused by direct hot isostatic pressing of powder and green blank can be avoided, thus ensuring the structural integrity of the end face sealing material. In addition, the hot isostatic pressing temperature being 20°C or more higher than the pre-sintering temperature will also help to improve the densification degree of the material, thereby improving the wear resistance and strength of the end face sealing material. Attached Figure Description

[0032] Figure 1 This is a flowchart of the preparation method of the end-face sealing material provided in this application. Detailed Implementation

[0033] This application provides an end-face sealing material comprising the following chemical composition: 6.5-9.0 wt% carbon material, 19.5-27.0 wt% Ni, 0.15-0.27 wt% Al2O3, 0.1-0.15 wt% TiC, with the balance being Cu; The preparation method of the above-mentioned end-face sealing material includes the following steps: (1) Preparation of C / Ni composite powder: A nickel layer is coated on the surface of carbon material by carbonyl vapor phase chemical deposition to obtain C / Ni composite powder; (2) Preparation of Al2O3 / TiC / Cu composite powder: Al2O3 / TiC / Cu composite powder was prepared by uniformly dispersing Al2O3 and TiC in Cu matrix using the ODS internal oxidation method; (3) Mixing: Mix C / Ni composite powder with Al2O3 / TiC / Cu composite powder to obtain a mixture; (4) Adding wax: Add 0.05-0.10 wt% paraffin wax to the mixture and mix evenly; (5) Molding: The mixture is loaded into the mold and held under pressure of 45-50MPa for 10-15s to obtain the preform; (6) Pre-sintering: The pre-preformed blocks are then loaded into a vacuum / atmosphere pressurized sintering furnace and pre-sintered using a five-stage heating process. The vacuum degree during the pre-sintering process is ≤10. -2The five-stage heating process is as follows: Stage 1: Heat from room temperature to 280-300℃ at a rate of 5-10℃ / min and hold for 60-120 min; Stage 2: Heat to 330-350℃ at a rate of 0.5-1℃ / min and hold for 30-60 min; Stage 3: Heat to 380-400℃ at a rate of 1-2℃ / min and hold for 180-210 min; Stage 4: Heat to 650-700℃ at a rate of 1-2℃ / min and hold for 10-20 min; Stage 5: Heat to 900-930℃ at a rate of 5-10℃ / min, apply pressure of 32-45 MPa, and hold for 30-60 min.

[0034] (7) Hot isostatic pressing: The pre-sintered material is sintered using hot isostatic pressing process. The sintering temperature is 950-980℃, the pressure is 120-170MPa, and the holding time is 3-4h to obtain the end face sealing material.

[0035] In this application, carbon nanotubes were purchased from Bailingwei Technology; graphene was purchased from Jinan Yuanhai Chemical; Al2O3 was purchased from Zhongtianli New Materials; and nano-titanium carbide (TiC) was purchased from Hubei Langbowan Biomedical. All raw materials, reagents, and solvents used in this application can be obtained commercially.

[0036] The present application will be further described in detail below with reference to embodiments, performance testing tests and accompanying drawings.

[0037] Examples 1-9 Examples 1-9 each provide an end-face sealing material.

[0038] The difference in the above embodiments is that the content of each chemical component used in the end-face sealing material is shown in Table 1 below.

[0039] The preparation method of the end-face sealing material provided in Examples 1-9 includes the following steps: (1) Preparation of C / Ni composite powder: The ingredients are prepared according to Table 1, and then a nickel layer is coated on the surface of carbon material (a mixture of carbon nanotubes and graphene with a weight ratio of 3:1) by carbonyl vapor phase chemical deposition to obtain C / Ni composite powder. (2) Preparation of Al2O3 / TiC / Cu composite powder: Al2O3 / TiC / Cu composite powder was prepared by uniformly dispersing Al2O3 and TiC in Cu matrix using the ODS internal oxidation method; (3) Mixing: Mix C / Ni composite powder with Al2O3 / TiC / Cu composite powder to obtain a mixture; (4) Adding wax: Add paraffin wax to the mixture and mix well; (5) Molding: The mixture is loaded into the mold and held under pressure of 50MPa for 15s to obtain the preform; (6) Pre-sintering: The pre-preformed blocks are then loaded into a vacuum / atmosphere pressurized sintering furnace and pre-sintered using a five-stage heating process. The vacuum degree during the pre-sintering process is ≤10. -2 The five-stage heating process is as follows: Stage 1: Heat from room temperature to 300℃ at 8℃ / min and hold for 100min; Stage 2: Heat to 340℃ at 0.8℃ / min and hold for 60min; Stage 3: Heat to 400℃ at 1.5℃ / min and hold for 200min; Stage 4: Heat to 680℃ at 1.5℃ / min and hold for 15min; Stage 5: Heat to 920℃ at 8℃ / min, pressurize to 40MPa, and hold for 60min.

[0040] (7) Hot isostatic pressing: The pre-sintered material is sintered using hot isostatic pressing process. The sintering temperature is 950℃, the pressure is 150MPa, and the holding time is 4h to obtain the end face sealing material.

[0041] Comparative Examples 1-7 Comparative Examples 1-7 each provide an end-face sealing material.

[0042] The difference between the above comparative example and Example 2 is that the content of each chemical component used in the end-face sealing material is shown in Table 1 below.

[0043] Table 1. Contents of various chemical components used in the end-face sealing materials of Examples 1-9 and Comparative Examples 1-7 Comparative Example 8 Comparative Example 8 provides an end-face sealing material.

[0044] The aforementioned end-face sealing material is: lead-indium electroplated on the surface of cast copper (ZCuPb10Sn10), with an indium layer thickness of 4μm and a lead layer thickness of 5μm.

[0045] Comparative Example 9 Comparative Example 9 provides an end-face sealing material.

[0046] The aforementioned end-face sealing material is: MoS2 sprayed onto the surface of cast copper (ZCuPb10Sn10) with a coating thickness of 8μm.

[0047] Comparative Example 10 Comparative Example 10 provides an end-face sealing material.

[0048] The difference between the above comparative example and Example 2 is that the C / Ni composite powder and Al2O3 / TiC / Cu composite powder were not prepared in advance in the preparation method of the end face sealing material.

[0049] That is, the mixing steps of Comparative Example 10 are as follows: carbon material, Ni powder, Al2O3 powder, TiC and copper powder are directly mixed to obtain a mixture.

[0050] Examples 10-12 Examples 10-12 each provide an end-face sealing material.

[0051] The difference between the above embodiment and Embodiment 2 lies in the pre-sintering temperature and the hot isostatic pressing temperature, as shown in Table 2 below.

[0052] Comparative Example 11 Comparative Example 11 provides an end-face sealing material.

[0053] The difference between the above comparative example and Example 2 is that the pre-sintering temperature and hot isostatic pressing temperature are as shown in Table 2 below.

[0054] Table 2. Pre-sintering temperature and hot isostatic pressing temperature in Examples 2, 10-12, and Comparative Example 11 Comparative Example 12 Comparative Example 12 provides an end-face sealing material.

[0055] The difference between the above comparative example and Example 2 is that the preparation method of the end face sealing material does not involve pre-sintering, but is directly hot isostatically sintered at 950℃ and 150MPa for 5 hours.

[0056] Performance testing The Brinell hardness, coefficient of friction, wear amount and compressive strength of the end face sealing materials obtained in Examples 1-12 and Comparative Examples 1-12 were tested, and the results are shown in Table 3 below.

[0057] (1) Friction coefficient and wear amount: The friction coefficient and dry friction wear amount of the end face sealing material under dry friction conditions were tested using a ring block friction and wear tester. The loading force was 100N, the rotation speed was 200r / min, and the test time was 3h. The average value was taken.

[0058] (2) Compressive strength: Tested in accordance with GB / T 7314-2019 "Metallic materials - room temperature compression test method".

[0059] Table 3 Performance testing of end-face sealing materials obtained in Examples 1-12 and Comparative Examples 1-12 According to the test results in Table 3, the Brinell hardness of the end-face sealing materials obtained in Examples 1-12 is 62-71 HB. Wear tests showed a friction coefficient of 0.024-0.047 (≤0.05), a wear rate of 0.025-0.098 wt% / h (≤0.10 wt% / h), and a compressive strength of 609-675 MPa (≥600 MPa). This indicates that the end-face sealing material provided in this application has suitable hardness, good lubricity, and excellent wear resistance and strength, making it suitable for use as a bearing end-face sealing material for high-precision gear pumps in fuel regulators.

[0060] When the carbon content in the end-face sealing material of Comparative Example 1 was 5 wt%, the obtained end-face sealing material had poor lubricity, and its friction coefficient was as high as 0.104 after wear test.

[0061] When the carbon content in the end-face sealing material of Comparative Example 2 is 10wt%, the obtained end-face sealing material has low strength, poor wear resistance, and a compressive strength of only 514MPa. The wear amount after wear test is as high as 0.368wt% / h.

[0062] When Al2O3 was not added to the end-face sealing material of Comparative Example 3, the hardness and strength of the obtained end-face sealing material were low, and the wear resistance was very poor. The Brinell hardness was 57HB, the compressive strength was only 502MPa, and the wear amount after wear test was as high as 0.510wt% / h.

[0063] When TiC was not added to the end-face sealing material of Comparative Example 4, the hardness and strength of the obtained end-face sealing material were low, and the wear resistance was very poor. The Brinell hardness was 58HB, the compressive strength was only 526MPa, and the wear amount after wear test was as high as 0.270wt% / h.

[0064] In the end-face sealing materials of Comparative Examples 5-7, carbon nanotubes, graphene, or a 1:1 weight ratio of carbon nanotubes and graphene were used as carbon materials. The resulting end-face sealing materials had a Brinell hardness of only 56-61 HB, a compressive strength of only 514-548 MPa, and a wear amount as high as 0.242-0.306 wt% / h after wear testing.

[0065] Comparative Examples 8 and 9 represent existing end-face sealing materials. Tests showed that their Brinell hardness was only 14-30 HB; wear tests showed that their coefficient of friction was 0.09-0.12, and their wear rate was as high as 0.547-0.660 wt% / h.

[0066] In the preparation method of Comparative Example 10, the end-face sealing material prepared by directly mixing the chemical components (without pre-preparing C / Ni composite powder and Al2O3 / TiC / Cu composite powder) has poor wear resistance and strength, with a strength of only 529 MPa and a wear amount as high as 0.102 wt% / h after wear test.

[0067] In the preparation methods of Comparative Examples 11-12, if the pre-sintering temperature is controlled at 920℃, the hot isostatic pressing temperature is controlled at 930℃, or the preform is not pre-sintered, the resulting end-face sealing material has low strength, poor wear resistance, and low compressive strength. The Brinell hardness of the end-face sealing material is only 52-56HB, and the wear amount per unit time is 0.278-0.390wt% / h, and the compressive strength is only 503-515MPa.

[0068] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. An end-face sealing material, characterized in that, The chemical composition includes the following contents: carbon material 6.5-9.0 wt%, Ni 19.5-27.0 wt%, Al2O3 0.15-0.27 wt%, TiC 0.1-0.15 wt%, with the balance being Cu; The carbon material is carbon nanotubes and graphene in a weight ratio of 3:(0.5-2); In the preparation method of the end-face sealing material: Ni needs to be coated on the surface of carbon material to pre-prepare C / Ni composite powder; Al2O3 and TiC are uniformly dispersed in Cu matrix to pre-prepare Al2O3 / TiC / Cu composite powder.

2. The end-face sealing material according to claim 1, characterized in that, The carbon material is carbon nanotubes and graphene in a weight ratio of 3:(1-1.5).

3. The end-face sealing material according to claim 1, characterized in that, The C / Ni composite powder was prepared by chemical vapor deposition; the Al2O3 / TiC / Cu composite powder was prepared by internal oxidation via ODS.

4. The method for preparing the end-face sealing material according to any one of claims 1-3, characterized in that, Includes the following steps: Preparation of C / Ni composite powder, preparation of Al2O3 / TiC / Cu composite powder, mixing, wax doping, molding, pre-sintering, hot isostatic pressing; The hot isostatic pressing temperature is 20°C or more higher than the pre-sintering temperature, but does not exceed 980°C.

5. The method for preparing the end-face sealing material according to claim 4, characterized in that, The pre-sintering process employs a five-stage heating process: First stage: Increase the temperature from room temperature to 280℃-300℃ at a rate of 5-10℃ / min and hold for 60-120 minutes; Second stage: Increase the temperature to 330-350℃ at a rate of 0.5-1℃ / min and hold for 30-60 minutes; Third stage: Increase the temperature to 380-400℃ at a rate of 1-2℃ / min and maintain the temperature for 180-210 minutes; Fourth stage: Increase the temperature to 650-700℃ at a rate of 1-2℃ / min and hold for 10-20 minutes; Fifth stage: Increase the temperature to 900-930℃ at a rate of 5-10℃ / min, apply pressure of 32-45MPa, and hold for 30-60 minutes.

6. The method for preparing the end-face sealing material according to claim 4, characterized in that, The hot isostatic pressing temperature is 950-980℃, the pressure is 120-170MPa, and the holding time is 3-4h.

7. The method for preparing the end-face sealing material according to claim 4, characterized in that, The molding pressure is 45-50 MPa, and the holding time is 10-15 seconds.

8. The method for preparing the end-face sealing material according to claim 1, characterized in that, The wax addition step is as follows: add 0.05-0.10 wt% paraffin wax to the mixture and mix evenly.

9. The application of the end-face sealing material obtained by the preparation method of the end-face sealing material according to any one of claims 1-3 or any one of claims 4-8 in a fuel regulator gear pump.

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