Modified wear-resistant friction material for friction pendulum shock insulation support and preparation method of modified wear-resistant friction material

Abstract

The invention relates to the field of wear-resistant materials, in particular to a modified wear-resistant friction material for a friction pendulum shock insulation support and a preparation method of the modified wear-resistant friction material. The modified wear-resistant friction material is a polytetrafluoroethylene filled silicon nitride modified material; the silicon nitride accounts for 1-10 wt% of the total weight of the modified wear-resistant friction material, and the polytetrafluoroethylene accounts for 90-99 wt% of the total weight of the modified wear-resistant friction material. According to the modified wear-resistant friction material for the friction pendulum isolation support and the preparation method of the modified wear-resistant friction material, provided by the invention, the wear resistance of the friction material for the friction pendulum isolation support can be effectively improved, and industrial large-scale production can be realized.

Description

Technical Field

[0001] The present invention relates to the field of wear-resistant materials, and particularly to a modified wear-resistant friction material for a friction pendulum isolation bearing and a preparation method thereof. Background Art

[0002] The friction pendulum isolation bearing is a key component in modern bridges and buildings. Through the relative sliding between the spherical friction pairs of the friction pendulum isolation bearing, the natural vibration period of the building can be significantly extended, effectively avoiding resonance with the main frequency of seismic motion. In addition, this sliding mechanism can efficiently dissipate seismic energy, thereby further reducing the risk of structural damage to the building. However, during the sliding operation, friction materials such as polytetrafluoroethylene commonly used for friction pairs are prone to wear, affecting the operation reliability of the friction pendulum isolation bearing and thus reducing the seismic isolation performance of the building structure.

[0003] Existing studies have shown that by adding nanoparticles to polytetrafluoroethylene, its wear resistance can be improved, thereby increasing the service life of the friction material. The invention patent CN119591996A of Hao Zhi et al. discloses "a wear-resistant modified polytetrafluoroethylene composite material and a preparation method thereof", in which a composite material is prepared by filling 1-12 wt% of Ga / Al-LDHs and 5-50 wt% of PEEK modified material into polytetrafluoroethylene to achieve synergistic strengthening of the surface and subsurface and improve wear resistance. The invention patent CN119039722A of Huang Guodian et al. discloses "a highly flexible polytetrafluoroethylene composite material and a preparation method thereof", in which modified bentonite, coconut shell fiber, pineapple leaf fiber and graphene are used as fillers and added to polytetrafluoroethylene, and then molded and sintered to enhance the flexibility and wear resistance of polytetrafluoroethylene. At the same time, the invention patent CN119019794A of Li Jianyou et al. discloses "a composite polytetrafluoroethylene material, a preparation method and an application thereof", in which a modified composite filler with a network structure coating layer on the surface is mixed uniformly with polytetrafluoroethylene and sintered to improve its wear resistance and mechanical properties. The above methods can all improve the wear resistance of polytetrafluoroethylene friction materials, but the types of fillers added are relatively many and the preparation process is relatively complex. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a modified wear-resistant friction material for a friction pendulum isolation bearing and a preparation method thereof.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] In a first aspect, the present invention provides a modified wear-resistant friction material for a friction pendulum isolation bearing, wherein the modified wear-resistant friction material is a polytetrafluoroethylene-filled silicon nitride modified material; the silicon nitride accounts for 1 to 10 wt % of the total weight of the modified wear-resistant friction material, and the polytetrafluoroethylene accounts for 90 to 99 wt % of the total weight of the modified wear-resistant friction material.

[0007] Preferably, the silicon nitride accounts for 5wt% of the total weight of the modified wear-resistant friction material, and the polytetrafluoroethylene accounts for 95wt% of the total weight of the modified wear-resistant friction material.

[0008] Preferably, the polytetrafluoroethylene is a molded micro powder with a particle size of 30 to 50 μm and a purity of 99.9%.

[0009] Preferably, the silicon nitride is Si3N4 nanoparticles with a particle size of 15 to 20 nm and a purity of 99.9 wt%.

[0010] In a second aspect, the present invention provides a method for preparing a modified wear-resistant friction material for a friction pendulum isolation bearing, comprising the following steps:

[0011] Step 1, preparing a mixed powder of polytetrafluoroethylene powder and silicon nitride nanoparticles according to a ratio, adding petroleum ether to form a mixture, and stirring with a stirrer;

[0012] Step 2, placing the stirred mixture in a drying oven for drying to obtain dried modified polytetrafluoroethylene powder;

[0013] Step 3, pouring the dried modified polytetrafluoroethylene powder into the mold cavity, applying a pressure of 30 MPa, and maintaining the pressure for 30 minutes to obtain a modified wear-resistant friction material blank;

[0014] Step 4, placing the modified wear-resistant friction material blank into a heating furnace for sintering to obtain the modified wear-resistant friction material.

[0015] Preferably, in step 1, the mixed powder and petroleum ether in the mixture are prepared in a weight ratio of 1:3 to 1:4, and the concentration of petroleum ether is 0.1 mol / L.

[0016] Preferably, in step 1, the agitator is a high-speed shearing device, the rotation speed during stirring is not less than 18000 r / min, and the stirring time is not less than 10 min.

[0017] Preferably, in step 2, the drying oven is a ventilation drying oven, and the temperature of the ventilation drying oven is 65-80°C.

[0018] Preferably, in step 4, the sintering temperature of the heating furnace is set according to the following scheme: first, it is heated from room temperature to 200°C at a rate not higher than 5°C / min, and the holding time is not less than 20 minutes; then it is heated to 380°C at a rate not higher than 2°C / min and held for not less than 120 - 150 min; then it is cooled from 380°C to 200°C at a cooling rate of 2°C / min and held for 30 min; after the heating is completed, the power is turned off and it is cooled to room temperature with the furnace.

[0019] More preferably, in step 4, during the sintering process of the heating furnace, the heating from 200°C to 380°C is divided into two stages: the heating rate from 200 to 300°C is 2°C / min and it is held for 30 min; the heating rate from 300 to 380°C is 1°C / min.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. In the modified wear-resistant friction material prepared by the present invention, the Si3N4 nanoparticles are dispersed in a reticular form, generating a dispersion strengthening and load-bearing enhancement effect, increasing the hardness and load-bearing capacity of the friction material. At the same time, a friction transfer film with a thickness of about 600 μm can be formed at the friction interface, significantly improving the tribological properties of the friction material.

[0022] 2. Compared with the unmodified polytetrafluoroethylene friction material, the wear rate of the modified wear-resistant friction material prepared by the present invention is significantly reduced, and the wear resistance is significantly improved.

[0023] 3. The modified wear-resistant friction material provided by the present invention only needs to fill a single Si3N4 nanoparticle in polytetrafluoroethylene, and the preparation process is simple, without a complex batching process, with high preparation efficiency and easy to realize batch production and application.

[0024] 4. The modified wear-resistant friction material for friction pendulum isolation bearings provided by the present invention and its preparation method can effectively improve the wear resistance of the friction material of the friction pendulum isolation bearing and can realize large-scale industrial production. Description of the Drawings

[0025] The present invention is further illustrated by the accompanying drawings, but the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the following drawings.

[0026] Figure 1 are the average friction coefficients and wear rates of the modified wear-resistant friction materials with Si3N4 nanoparticle contents of 0 wt%, 1 wt%, 3 wt%, 5 wt%, 7 wt%, and 10 wt% under a normal load of 100 N and sliding speeds of 0.05 m / s, 0.10 m / s, and 0.15 m / s;

[0027] Figure 2 The average friction coefficients and wear rates of modified wear-resistant friction materials with Si3N4 nanoparticle contents of 0 wt%, 1 wt%, 3 wt%, 5 wt%, 7 wt%, and 10 wt% under normal loads of 100 N, 150 N, and 200 N and a sliding speed of 0.15 m / s;

[0028] Figure 3 SEM images of the surface microtopography and element distribution of a modified wear-resistant friction material with a Si3N4 nanoparticle content of 5 wt%;

[0029] Figure 4 EDS images of the surface microtopography and element distribution of a modified wear-resistant friction material with a Si3N4 nanoparticle content of 5 wt%;

[0030] Figure 5 The average friction coefficients and wear rates of a modified wear-resistant friction material with a Si3N4 nanoparticle content of 5 wt% under a normal load of 100 N and a sliding speed of 0.10 m / s under different heating and sintering temperature-increasing schemes. Detailed implementation manners

[0031] The technical solutions of the present invention are described below through specific specific examples. It should be understood that one or more method steps mentioned in the present invention do not exclude the existence of other method steps before and after the combined steps or the insertion of other method steps between these clearly mentioned steps; it should also be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. Moreover, unless otherwise specified, the numbers of the method steps are only convenient tools for identifying the method steps, rather than limiting the arrangement order of the method steps or the scope in which the present invention can be implemented. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope in which the present invention can be implemented.

[0032] In order to better understand the above technical solutions, the exemplary embodiments of the present invention are described in more detail below. Although the exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to be able to convey the scope of the present invention completely to those skilled in the art.

[0033] The present invention is further described below in conjunction with the following embodiments.

[0034] Embodiment 1

[0035] A preparation method of a modified wear-resistant friction material for a friction pendulum isolation bearing includes the following steps:

[0036] Step 1: Use a crusher to disperse and obtain polytetrafluoroethylene powder with a particle size of 30 - 50 μm and a purity of 99.9%.

[0037] Step 2: Prepare a mixed powder by mixing polytetrafluoroethylene powder and Si3N4 nanoparticles with a particle size of 15 - 20 nm and a purity of 99.9 wt%. Among them, silicon nitride accounts for 1 wt% of the total weight, and polytetrafluoroethylene accounts for 99 wt% of the total weight. Then add petroleum ether to form a mixture. The mixture is prepared by mixing the mixed powder and petroleum ether at a weight ratio of 1:3, and the concentration of petroleum ether is 0.1 mol / L. Use a high-speed shearer to stir, with a rotation speed of not less than 18000 r / min during stirring, and a stirring time of not less than 10 min.

[0038] Step 3: Place the evenly stirred mixture in a ventilated drying oven at a temperature of 75 °C for drying to obtain dried modified polytetrafluoroethylene powder.

[0039] Step 4: Pour the dried modified polytetrafluoroethylene powder into the mold cavity, apply a pressure of 30 MPa, and keep the pressure for 30 minutes to obtain a blank of modified wear-resistant friction material.

[0040] Step 5: Put the blank of modified wear-resistant friction material into a heating furnace. First, raise the temperature from room temperature to 200 °C at a rate of 5 °C / min and keep it for 20 minutes. Then raise the temperature to 380 °C. Among them, the heating rate from 200 - 300 °C is 2 °C / min and keep it for 30 min; the heating rate from 300 - 380 °C is 1 °C / min and keep it for 120 min. Then cool down from 380 °C to 200 °C at a rate of 2 °C / min and keep it for 30 min. After heating, turn off the power and cool it to room temperature with the furnace. Obtain the modified wear-resistant friction material.

[0041] Example 2

[0042] A preparation method of a modified wear-resistant friction material for a friction pendulum isolation bearing, comprising the following steps:

[0043] Step 1: Use a crusher to disperse and obtain polytetrafluoroethylene powder with a particle size of 30 - 50 μm and a purity of 99.9%.

[0044] Step 2: Prepare a mixed powder by mixing polytetrafluoroethylene powder and Si3N4 nanoparticles with a particle size of 15 - 20 nm and a purity of 99.9 wt%. Among them, silicon nitride accounts for 3 wt% of the total weight, and polytetrafluoroethylene accounts for 97 wt% of the total weight. Then add petroleum ether to form a mixture. The mixture is prepared by mixing the mixed powder and petroleum ether at a weight ratio of 1:3, and the concentration of petroleum ether is 0.1 mol / L. Use a high-speed shearer to stir, with a rotation speed of not less than 18000 r / min during stirring, and a stirring time of not less than 10 min.

[0045] Step 3: Place the evenly stirred mixture in a ventilated drying oven at 75°C for drying to obtain dried modified polytetrafluoroethylene powder.

[0046] Step 4: Pour the dried modified polytetrafluoroethylene powder into the mold cavity, apply a pressure of 30 MPa, and hold the pressure for 30 minutes to obtain a blank of modified wear-resistant friction material.

[0047] Step 5: Place the blank of modified wear-resistant friction material in a heating furnace. First, raise the temperature from room temperature to 200°C at a rate of 5°C / min and hold for 20 minutes. Then raise the temperature to 380°C. Among them, the heating rate from 200 to 300°C is 2°C / min and hold for 30 min; the heating rate from 300 to 380°C is 1°C / min and hold for 120 min. Then cool down from 380°C to 200°C at a rate of 2°C / min and hold for 30 min. After heating, turn off the power and cool down to room temperature with the furnace. Obtain the modified wear-resistant friction material.

[0048] Example 3

[0049] A preparation method of a modified wear-resistant friction material for a friction pendulum isolation bearing, comprising the following steps:

[0050] Step 1: Use a crusher to disperse to obtain polytetrafluoroethylene powder with a particle size of 30 - 50 μm and a purity of 99.9%.

[0051] Step 2: Prepare a mixed powder by mixing polytetrafluoroethylene powder and Si3N4 nanoparticles with a particle size of 15 - 20 nm and a purity of 99.9 wt%. Among them, silicon nitride accounts for 5 wt% of the total weight, and polytetrafluoroethylene accounts for 95 wt% of the total weight. Then add petroleum ether to form a mixture. The mixed powder and petroleum ether in the mixture are prepared according to a weight ratio of 1:4, and the concentration of petroleum ether is 0.1 mol / L. And use a high-speed shearer for stirring. The rotation speed during stirring is not less than 18000 r / min, and the stirring time is not less than 10 min.

[0052] Step 3: Place the evenly stirred mixture in a ventilated drying oven at 75°C for drying to obtain dried modified polytetrafluoroethylene powder.

[0053] Step 4: Pour the dried modified polytetrafluoroethylene powder into the mold cavity, apply a pressure of 30 MPa, and hold the pressure for 30 minutes to obtain a blank of modified wear-resistant friction material.

[0054] Step 5: Place the modified wear-resistant friction material blank into a heating furnace. First, heat it from room temperature to 200°C at a rate of 5°C / min, with a holding time of 20 minutes; then heat it to 380°C. Among them, the heating rate from 200 to 300°C is 2°C / min, and hold for 30 min; the heating rate from 300 to 380°C is 1°C / min, and hold for 120 min; then cool it from 380°C to 200°C at a cooling rate of 2°C / min and hold for 30 min; after the heating is completed, turn off the power supply and cool it to room temperature with the furnace. The modified wear-resistant friction material is obtained.

[0055] Example 4

[0056] A preparation method of a modified wear-resistant friction material for a friction pendulum isolation bearing includes the following steps:

[0057] Step 1: Use a crusher to disperse to obtain polytetrafluoroethylene powder with a particle size of 30 - 50 μm and a purity of 99.9%.

[0058] Step 2: Prepare a mixed powder by mixing polytetrafluoroethylene powder and Si3N4 nanoparticles with a particle size of 15 - 20 nm and a purity of 99.9 wt%. Among them, silicon nitride accounts for 7 wt% of the total weight, and polytetrafluoroethylene accounts for 93 wt% of the total weight; then add petroleum ether to form a mixture. The mixed powder and petroleum ether in the mixture are formulated according to a weight ratio of 1:3, and the concentration of petroleum ether is 0.1 mol / L, and use a high-speed shearer to stir. The rotation speed during stirring is not less than 18000 r / min, and the stirring time is not less than 10 min.

[0059] Step 3: Place the uniformly stirred mixture in a ventilated drying oven at 75°C for drying to obtain dried modified polytetrafluoroethylene powder.

[0060] Step 4: Pour the dried modified polytetrafluoroethylene powder into the mold cavity, apply a pressure of 30 MPa, and hold the pressure for 30 minutes to obtain a modified wear-resistant friction material blank.

[0061] Step 5: Place the modified wear-resistant friction material blank into a heating furnace. First, heat it from room temperature to 200°C at a rate of 5°C / min, with a holding time of 20 minutes; then heat it to 380°C. Among them, the heating rate from 200 to 300°C is 2°C / min, and hold for 30 min; the heating rate from 300 to 380°C is 1°C / min, and hold for 120 min; then cool it from 380°C to 200°C at a cooling rate of 2°C / min and hold for 30 min; after the heating is completed, turn off the power supply and cool it to room temperature with the furnace. The modified wear-resistant friction material is obtained.

[0062] Example 5

[0063] A preparation method of a modified wear-resistant friction material for a friction pendulum isolation bearing, comprising the following steps:

[0064] Step 1, using a crusher to disperse to obtain polytetrafluoroethylene powder with a particle size of 30-50 μm and a purity of 99.9%.

[0065] Step 2, formulating the polytetrafluoroethylene powder and Si3N4 nanoparticles with a particle size of 15-20 nm and a purity of 99.9 wt% into a mixed powder. Among them, silicon nitride accounts for 10 wt% of the total weight, and polytetrafluoroethylene accounts for 90 wt% of the total weight; then add petroleum ether to form a mixture, and the mixed powder and petroleum ether in the mixture are formulated according to a weight ratio of 1:3, and the concentration of petroleum ether is 0.1 mol / L, and use a high-speed shearer to stir, the rotation speed during stirring is not less than 18000 r / min, and the stirring time is not less than 10 min.

[0066] Step 3, placing the uniformly stirred mixture in a ventilated drying oven at a temperature of 75 °C for drying to obtain dried modified polytetrafluoroethylene powder.

[0067] Step 4, pouring the dried modified polytetrafluoroethylene powder into the mold cavity, applying a pressure of 30 MPa, and maintaining the pressure for 30 minutes to obtain a blank of the modified wear-resistant friction material.

[0068] Step 5, putting the blank of the modified wear-resistant friction material into a heating furnace, first raising the temperature from room temperature to 200 °C at a rate of 5 °C / min, and maintaining the temperature for 20 minutes; then raising the temperature to 380 °C, among which, the heating rate from 200 to 300 °C is 2 °C / min, and maintaining the temperature for 30 min; the heating rate from 300 to 380 °C is 1 °C / min, and maintaining the temperature for 120 min; then cooling from 380 °C to 200 °C at a cooling rate of 2 °C / min and maintaining the temperature for 30 min; after the heating is completed, turn off the power and cool to room temperature with the furnace. Obtain the modified wear-resistant friction material.

[0069] Comparative Example 1

[0070] A modified wear-resistant friction material for a friction pendulum isolation bearing, different from Example 3 in that in Step 2 of the preparation, the addition amount of silicon nitride is 0 wt%, and it is all composed of polytetrafluoroethylene powder.

[0071] From Figure 1 and 2 It can be seen that for the modified wear-resistant friction material composed of 5 wt% Si3N4 nanoparticles and 95 wt% polytetrafluoroethylene, except for the normal load of 100 N and the sliding speed of 0.1 m / s, the friction coefficient is the lowest under other test conditions. In addition, after adding 5 wt% Si3N4 nanoparticles in Example 3, the wear rate of the modified wear-resistant friction material is reduced by more than 85%, and the wear resistance is greatly improved.

[0072] The surface microtopography and elemental distribution of the modified wear-resistant friction material in Example 3, i.e., with a Si3N4 nanoparticle content of 5 wt%, were photographed using a scanning electron microscope and an energy dispersive spectrometer, as Figure 3 shown.

[0073] From Figure 4 it can be seen that the surface of the modified wear-resistant friction material has a high surface finish, the distributions of F and Si elements are uniform, and the Si element is dispersed in a network pattern, indicating that the Si3N4 nanoparticles are dispersed in a network pattern in the modified wear-resistant friction material, thereby producing dispersion strengthening and enhanced load-bearing effects and improving its wear resistance.

[0074] Comparative Example 2

[0075] A modified wear-resistant friction material for a friction pendulum isolation bearing, which is different from Example 3 in that during the sintering process in a heating furnace, the heating rate from 200 °C to 380 °C is 2 °C / min.

[0076] Comparative Example 3

[0077] A modified wear-resistant friction material for a friction pendulum isolation bearing, which is different from Example 3 in that during the sintering process in a heating furnace, it is heated from room temperature to 380 °C at a rate of 5 °C / min and the holding time is 120 minutes.

[0078] From Figure 5 it can be seen that the friction coefficients of Example 3 and Comparative Example 2 are almost the same, but the average wear rate of Example 3 is slightly lower than that of Example 2, indicating that the heating and sintering heating scheme of Example 3 is better.

[0079] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0080] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A modified wear-resistant friction material for a friction pendulum isolation bearing, characterized in that, The modified wear-resistant friction material is a polytetrafluoroethylene-filled silicon nitride modified material; the silicon nitride accounts for 1-10wt% of the total weight of the modified wear-resistant friction material, and the polytetrafluoroethylene accounts for 90-99wt% of the total weight of the modified wear-resistant friction material.

2. The modified wear-resistant friction material for a friction pendulum isolation bearing according to claim 1, wherein, The silicon nitride accounts for 5wt% of the total weight of the modified wear-resistant friction material, and the polytetrafluoroethylene accounts for 95wt% of the total weight of the modified wear-resistant friction material.

3. The modified wear-resistant friction material for a friction pendulum isolation bearing according to claim 1, characterized in that, The polytetrafluoroethylene is molded micro powder with a particle size of 30 to 50 μm and a purity of 99.9%.

4. A modified wear-resistant friction material for a friction pendulum isolation bearing according to claim 1, characterized in that, The silicon nitride is Si3N4 nanoparticles with a particle size of 15-20nm and a purity of 99.9wt%.

5. A preparation method of a modified wear-resistant friction material for a friction pendulum isolation bearing according to claim 1, characterized in that, The steps include: Step 1, preparing a mixed powder of polytetrafluoroethylene powder and silicon nitride nanoparticles according to a ratio, adding petroleum ether to form a mixture, and stirring with a stirrer; Step 2, placing the stirred mixture in a drying oven for drying to obtain dried modified polytetrafluoroethylene powder; Step 3, pouring the dried modified polytetrafluoroethylene powder into the mold cavity, applying a pressure of 30 MPa, and maintaining the pressure for 30 minutes to obtain a modified wear-resistant friction material blank; Step 4, placing the modified wear-resistant friction material blank into a heating furnace for sintering to obtain the modified wear-resistant friction material.

6. The modified wear-resistant friction material for a friction pendulum isolation bearing according to claim 5, characterized in that In the step 1, the mixed powder and petroleum ether in the mixture are prepared in a weight ratio of 1:3 to 1:4, and the concentration of petroleum ether is 0.1 mol / L.

7. The modified wear-resistant friction material for a friction pendulum isolation bearing according to claim 5, characterized in that, In step 1, the stirrer is a high-speed shearing device, the rotation speed during stirring is not less than 18000 r / min, and the stirring time is not less than 10 min.

8. The modified wear-resistant friction material for a friction pendulum isolation bearing according to claim 5, characterized in that, In step 2, the drying oven is a ventilation drying oven, and the temperature of the ventilation drying oven is 65-80°C.

9. A modified wear-resistant friction material for a friction pendulum isolation bearing according to claim 5, characterized in that, In step 4, the sintering temperature of the heating furnace is set according to the following scheme: first, the temperature is increased from room temperature to 200°C at a rate not higher than 5°C / min, and the holding time is not less than 20 minutes; then the temperature is increased to 380°C at a rate not higher than 2°C / min, and the temperature is kept for not less than 120-150 minutes; then the temperature is reduced from 380°C to 200°C at a cooling rate of 2°C / min and kept for 30 minutes; after the heating is completed, the power is turned off and the furnace is cooled to room temperature.

10. A modified wear-resistant friction material for a friction pendulum isolation bearing according to claim 5, characterized in that, In step 4, during the sintering process in the heating furnace, the temperature is raised from 200°C to 380°C in two stages: the temperature rise rate from 200 to 300°C is 2°C / min, and the temperature is kept for 30 minutes; the temperature rise rate from 300 to 380°C is 1°C / min.

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