Environmentally friendly spray friction plate and manufacturing method thereof

Abstract

The invention discloses an environmentally friendly spray friction plate and a manufacturing method thereof, which comprises the following components by weight percentage: 50-58% copper, 5-7% tin, 8-12% zinc, 8-12% copper-chromium-zirconium alloy, 5-10% graphite, 8-12% zircon sand, 1-3% molybdenum disulfide, and 1-3% molybdenum. The technical solution improves the friction plate matrix strength and heat resistance strength by adding copper-chromium-zirconium alloy powder, thereby improving the friction and wear performance of the friction plate, and by adding copper-chromium-zirconium alloy powder, the adhesion performance with graphite can be increased, thereby improving the friction performance of the friction plate. The energy load allowable value of the copper-based wet friction plate produced by the formula and process of the invention is increased by up to 31%, the wear rate is reduced by 62%, the power transmitted per unit area is large, the heat load and heat impulse effect can be withstood for a long time, the service life is long, and it is suitable for use under high speed, heavy load and high power conditions.

Description

Technical Field

[0001] The invention relates to the technical field of powder metallurgy friction material technology, and in particular to an environmentally friendly spraying friction plate and a manufacturing method thereof. Background Art

[0002] As a key component of friction clutches and brakes, copper-based friction plates are usually composed of a steel core plate and a layer of copper-based friction material on at least one side. The traditional production method of friction plates at home and abroad is mainly based on the bell-shaped furnace pressure sintering method (pressure sintering method), and the production process mainly includes the following steps: 1. Ingredients; 2. Mixing; 3. Pressing; 4. Core plate copper plating; 5. Pressure sintering; 6. Oil tank processing. However, the pressure sintering method has problems such as high energy consumption, low production efficiency, and high cost.

[0003] In order to solve the problems existing in the pressure sintering method, new manufacturing processes based on the spraying process have been introduced one after another. For example, the patent application with the publication number of graphite N106481705A discloses a copper-based spraying friction plate without copper plating on the core plate and its preparation method, wherein the friction layer powder is made of copper powder, iron powder, lead powder, graphite powder, zircon sand powder and tin in a certain proportion, and the following procedures are adopted: 1) mixing, 2) cleaning and degreasing the core plate, 3) spraying pre-sintering, 4) grooving, 5) re-firing, 6) precision pressing; 7, oiling. The patent application with publication number Graphite N 107201460A discloses a lead-free environmentally friendly wet copper-based friction plate and a preparation method thereof, wherein the friction layer powder is composed of the following raw materials and mass percentages: 55-65% -200 mesh graphite powder, 8-15% -200 mesh zinc powder, 4-8% -200 mesh tin powder, 5-10% -200 mesh graphite powder, 8-14% -100 mesh ZrSiO 4 (zircon sand), the following procedures are adopted: 1) batching, 2) mixing, 3) core plate copper plating, 4) spraying pre-sintering, 5) groove pressing, 6) re-firing, 7) precision pressing. However, during the re-firing process of the friction plate, pressure sintering in a bell furnace is adopted, which easily leads to large deformation of the tooth shape of the friction plate and low friction performance of the friction plate. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide an environmentally friendly spray friction plate and a manufacturing method thereof, wherein the friction plate has small deformation and good friction performance.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0006] An environmentally friendly spray friction plate comprises the following components by weight percentage: 50-58% copper, 5-7% tin, 8-12% zinc, 8-12% copper-chromium-zirconium alloy, 5-10% graphite, 8-12% zircon sand, 1-3% molybdenum disulfide and 1-3% molybdenum.

[0007] Preferably, the particle size of copper is -200 mesh, the particle size of tin is -200 mesh, the particle size of zinc is -200 mesh, the particle size of graphite is -200 mesh artificial graphite, the particle size of zircon sand is -100 mesh, the particle size of copper-chromium-zirconium alloy is -100 mesh, the particle size of molybdenum is -300 mesh, and the particle size of molybdenum disulfide is -300 mesh.

[0008] Preferably, the composition includes the following components by weight percentage: 50% copper, 6% tin, 11% zinc, 10% copper-chromium-zirconium alloy, 8% graphite, 11% zircon sand, 1% molybdenum disulfide, and 3% molybdenum.

[0009] A method for preparing the above-mentioned environmentally friendly spray friction plate comprises the following steps:

[0010] a) Ingredients: Weigh copper powder, tin powder, zinc powder, copper-chromium-zirconium alloy powder, graphite powder, zircon sand powder, molybdenum disulfide powder and molybdenum powder according to the weight of each component;

[0011] b) Mixing: put the prepared powder into the mixer and mix evenly;

[0012] Graphite) core board copper plating: the core board is copper plated by electroplating;

[0013] d) Spraying pre-sintering: Sprinkle the powder mixed in step b) evenly on the core plate on a spraying machine, and put it into a mesh belt furnace to sinter both sides of the friction plate;

[0014] e) groove pressing, placing the friction plate pre-sintered by spraying in step d) on a groove pressing mold and pressing the groove on a press machine;

[0015] f) re-firing, placing the friction plate after the groove pressing in step e) into a mesh belt furnace for sintering;

[0016] g) Coining: The friction plate after re-firing in step f) is placed on a flat die and coined on a press.

[0017] 5. The method for preparing an environmentally friendly spray friction plate according to claim 4, characterized in that in step b), the mixing time is 0.5-1h.

[0018] Preferably, in the process of graphite, the core plate is hung on the cathode, the copper plate is hung on the anode, a plating solution containing copper ions is added to the plating tank, and direct current is passed to make the plating layer thickness 0.005-0.01mm.

[0019] Preferably, in step d), the sintering conditions are: sintering temperature is 750-850°C, insulation time is 0.3-0.8h, and the atmosphere is ammonia decomposition gas.

[0020] Preferably, in step f), the grooved friction plate is placed in a mesh belt furnace for pressureless sintering at a temperature of 800° C. to 850° C. for 1 to 1.5 hours.

[0021] Preferably, in step g), a limit block for the final thickness of the friction plate is used to ensure the size of the friction plate, and the pressure of the press is 100-150 MPa.

[0022] The present invention has the following beneficial effects due to the adoption of the above technical solution:

[0023] 1. The friction plate provided by the present invention adopts a lead-free formula, which has more environmental advantages;

[0024] 2. In the present invention, copper-chromium-zirconium alloy powder is creatively added to the friction plate. The copper-chromium-zirconium alloy has good electrical conductivity and thermal conductivity, high hardness, wear resistance, explosion resistance, crack resistance, and high softening temperature. By adding the copper-chromium-zirconium alloy powder, the friction plate matrix strength and heat resistance strength are improved, thereby improving the friction and wear performance of the friction plate. In addition, since the copper-chromium-zirconium alloy powder is atomized copper-chromium-zirconium alloy and the copper powder is dendritic electrolytic copper powder, the fluidity of the copper-chromium-zirconium alloy powder is better than that of the electrolytic copper powder, thereby improving the processability of the friction plate spraying, making the powdering more uniform, and making the friction plate smoother.

[0025] 3. Adding copper-chromium-zirconium alloy powder to the friction plate can increase the bonding performance with graphite, thereby improving the friction performance of the friction plate;

[0026] 4. The friction plate of the present invention is re-fired by pressureless sintering in a mesh belt furnace, which heats quickly and causes little deformation of the tooth shape of the friction plate;

[0027] 5. Compared with traditional lead-containing friction plates, the energy load allowable value of the copper-based wet friction plates produced by the formula and process of the present invention is increased by up to 31%, the wear rate is reduced by 62%, the power transmitted per unit area is large, it can withstand the effects of heat load and thermal impulse for a long time, has a long service life, and is suitable for use under high speed, heavy load and high power conditions. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, which are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0029] Embodiment 1:

[0030] An environmentally friendly spray friction plate includes the following components by weight percentage: 52% copper, 6% tin, 11% zinc, 10% copper-chromium-zirconium alloy powder, 8% graphite, 11% zircon sand, 1% molybdenum disulfide, and 1% molybdenum. Among them, the particle size of copper is -200 mesh, the particle size of tin is -200 mesh, the particle size of zinc is -200 mesh, the particle size of graphite is -200 mesh artificial graphite, the particle size of zircon sand is -100 mesh, the copper-chromium-zirconium alloy powder is -100 mesh, the molybdenum is -300 mesh, and the molybdenum disulfide is -300 mesh.

[0031] The method for preparing an environmentally friendly spray friction plate of the present invention comprises the following steps:

[0032] a) Ingredients: Weigh copper powder, tin powder, zinc powder, copper-chromium-zirconium alloy powder, graphite powder, zircon sand powder, molybdenum disulfide powder and molybdenum powder according to the weight of each component;

[0033] b) Mixing: put the prepared powder into a mixer and mix for 1 hour;

[0034] c) Core board copper plating: The core board is copper plated by electroplating; the core board is hung on the cathode, the copper plate is hung on the anode, the electroplating solution containing copper ions is added to the electroplating tank, direct current is passed, the plating thickness is 0.005-0.01mm, and the electroplating time is adjusted according to the plating thickness; the core board must be degreased and derusted before electroplating;

[0035] d) Spraying pre-sintering: Spray the mixed powder in step b) evenly on the core plate on a spraying machine, and put it into a mesh belt furnace for sintering. The sintering temperature is 820℃, and the temperature is kept for 0.5 hours. The atmosphere is ammonia decomposition gas. Both sides of the friction plate are friction layers, and both sides are sprayed and pre-sintered in the same way.

[0036] e) Grooving: placing the friction plate pre-sintered by spraying in step d) on a groove pressing die and then pressing the groove on a press machine;

[0037] f) Re-firing: Place the friction plate after groove pressing in step e) into a mesh belt furnace for pressureless sintering at a pressure of 0.2 MPa, a temperature of 820°C, and a sintering time of 1.2 hours;

[0038] g) Precision pressing: Place the friction plate after re-firing in step f) on a flat die and precision press it on a press machine at a pressure of 125 MPa. Precision pressing uses a thickness limit block with the final size of the friction plate to ensure the size of the friction plate and the finished friction plate.

[0039] Embodiment 2:

[0040] An environmentally friendly spray friction plate includes the following components by weight percentage: 50% copper, 6% tin, 11% zinc, 12% copper-chromium-zirconium alloy powder, 7% graphite, 11% zircon sand, 1% molybdenum disulfide, and 2% molybdenum. Among them, the particle size of copper is -200 mesh, the particle size of tin is -200 mesh, the particle size of zinc is -200 mesh, the particle size of graphite is -200 mesh artificial graphite, the particle size of zircon sand is -100 mesh, the copper-chromium-zirconium alloy powder is -100 mesh, the molybdenum is -300 mesh, and the molybdenum disulfide is -300 mesh.

[0041] The method for preparing an environmentally friendly spray friction plate of the present invention comprises the following steps:

[0042] a) Ingredients: Weigh copper powder, tin powder, zinc powder, copper-chromium-zirconium alloy powder, graphite powder, zircon sand powder, molybdenum disulfide powder and molybdenum powder according to the weight of each component;

[0043] b) Mixing: put the prepared powder into a mixer and mix for 1.5 hours;

[0044] c) Copper plating of core board: copper plating of core board is performed by electroplating; the core board is hung on the cathode, the copper plate is hung on the anode, electroplating solution containing copper ions is added into the electroplating tank, direct current is passed, the plating thickness is 0.005-0.01mm, and the electroplating time is adjusted according to the plating thickness;

[0045] d) Spraying pre-sintering: Sprinkle the powder mixed in step b) evenly on the core plate on a spraying machine, and put it into a mesh belt furnace for sintering. The sintering temperature is: 820℃, and the temperature is kept for 0.5 hours. The atmosphere is: ammonia decomposition gas;

[0046] e) Grooving: placing the friction plate pre-sintered by spraying in step d) on a groove pressing die and then pressing the groove on a press machine;

[0047] f) Re-firing: Place the friction plate after groove pressing in step e) into a mesh belt furnace for pressureless sintering at a temperature of 840°C for 1 hour;

[0048] g) Precision pressing: the friction plate after re-firing in step f) is placed on a flat die and precision pressed on a press machine at a pressure of 125MPa. Precision pressing uses a thickness limit block with the final size of the friction plate to ensure the size of the friction plate and obtain a finished friction plate.

[0049] Embodiment 3:

[0050] An environmentally friendly spray friction plate includes the following components by weight percentage: 52% copper, 6% tin, 11% zinc, 9% copper-chromium-zirconium alloy powder, 8% graphite, 11% zircon sand, 2% molybdenum disulfide, and 1% molybdenum. Among them, the particle size of copper is -200 mesh, the particle size of tin is -200 mesh, the particle size of zinc is -200 mesh, the particle size of graphite is -200 mesh artificial graphite, the particle size of zircon sand is -100 mesh, the copper-chromium-zirconium alloy powder is -100 mesh, the molybdenum is -300 mesh, and the molybdenum disulfide is -300 mesh.

[0051] The method for preparing an environmentally friendly spray friction plate of the present invention comprises the following steps:

[0052] a) Ingredients: Weigh copper powder, tin powder, zinc powder, copper-chromium-zirconium alloy powder, graphite powder, zircon sand powder, molybdenum disulfide powder and molybdenum powder according to the weight of each component;

[0053] b) Mixing: put the prepared powder into a mixer and mix for 1 hour;

[0054] c) Core board copper plating: The core board is copper plated by electroplating; the core board is hung on the cathode, the copper plate is hung on the anode, the electroplating solution containing copper ions is added to the electroplating tank, direct current is passed, the plating thickness is 0.005-0.01mm, and the electroplating time is adjusted according to the plating thickness; the core board must be degreased and derusted before electroplating;

[0055] d) Spraying pre-sintering: Spray the mixed powder in step b) evenly on the core plate on a spraying machine, and put it into a mesh belt furnace for sintering. The sintering temperature is 820℃, and the temperature is kept for 0.5 hours. The atmosphere is ammonia decomposition gas. Both sides of the friction plate are friction layers, and both sides are sprayed and pre-sintered in the same way.

[0056] e) Grooving: placing the friction plate pre-sintered by spraying in step d) on a groove pressing die and then pressing the groove on a press machine;

[0057] f) Re-firing: The friction plate after groove pressing in step e) is placed in a mesh belt furnace for pressureless sintering at a pressure of 0.2 MPa, a temperature of 830°C, and a time of 1.2 hours;

[0058] g) Precision pressing: the friction plate after re-firing in step f) is placed on a flat die and precision pressed on a press machine at a pressure of 125MPa. Precision pressing uses a thickness limit block with the final size of the friction plate to ensure the size of the friction plate and obtain a finished friction plate.

[0059] Embodiment 4:

[0060] An environmentally friendly spray friction plate includes the following components by weight percentage: 50% copper, 6% tin, 11% zinc, 10% copper-chromium-zirconium alloy powder, 8% graphite, 11% zircon sand, 1% molybdenum disulfide, and 3% molybdenum. Among them, the particle size of copper is -200 mesh, the particle size of tin is -200 mesh, the particle size of zinc is -200 mesh, the particle size of graphite is -200 mesh artificial graphite, the particle size of zircon sand is -100 mesh, the copper-chromium-zirconium alloy powder is -100 mesh, the molybdenum is -300 mesh, and the molybdenum disulfide is -300 mesh.

[0061] The method for preparing an environmentally friendly spray friction plate of the present invention comprises the following steps:

[0062] a) Ingredients: Weigh copper powder, tin powder, zinc powder, copper-chromium-zirconium alloy powder, graphite powder, zircon sand powder, molybdenum disulfide powder and molybdenum powder according to the weight of each component;

[0063] b) Mixing: put the prepared powder into a mixer and mix for 1 hour;

[0064] c) Core board copper plating: The core board is copper plated by electroplating; the core board is hung on the cathode, the copper plate is hung on the anode, the electroplating solution containing copper ions is added to the electroplating tank, direct current is passed, the plating thickness is 0.005-0.01mm, and the electroplating time is adjusted according to the plating thickness; the core board must be degreased and derusted before electroplating;

[0065] d) Spraying pre-sintering: the powder mixed in step b) is evenly sprinkled on the core plate on the spraying machine, and then placed in a mesh belt furnace for sintering. The sintering temperature is 820℃, and the temperature is kept for 0.5 hours. The atmosphere is ammonia decomposition gas. Both sides of the friction plate are friction layers, and both sides are sprayed and pre-sintered in the same way.

[0066] e) Grooving: placing the friction plate pre-sintered by spraying in step d) on a groove pressing die and then pressing the groove on a press machine;

[0067] f) Re-firing: The friction plate after groove pressing in step e) is placed in a mesh belt furnace for pressureless sintering at a pressure of 0.2 MPa, a temperature of 840°C, and a time of 1.2 hours;

[0068] g) Precision pressing: the friction plate after re-firing in step f) is placed on a flat die and precision pressed on a press machine at a pressure of 125MPa. Precision pressing uses a thickness limit block with the final size of the friction plate to ensure the size of the friction plate and obtain a finished friction plate.

[0069] Comparative Example 1:

[0070] Comparative Example 1 is an existing conventional lead-sprayed friction plate, comprising the following components by weight: 60% copper, 6% tin, 11% zinc, 4% lead, 7% graphite, and 12% zirconium silicate. The particle size of copper is -200 mesh, the particle size of tin is -200 mesh, the particle size of zinc is -200 mesh, the particle size of lead is -200 mesh, the particle size of graphite is -200 mesh, and the particle size of zirconium silicate is -100 mesh;

[0071] An existing conventional lead-sprayed friction plate comprises the following steps:

[0072] a) Ingredients: Weigh copper powder, tin powder, zinc powder, lead powder, graphite powder and zirconium silicate according to the weight of each component;

[0073] b) Mixing: put the prepared powder into a mixer and mix for 1 hour;

[0074] c) Core board copper plating: The core board is copper plated by electroplating; the core board is hung on the cathode, the copper plate is hung on the anode, the electroplating solution containing copper ions is added to the electroplating tank, direct current is passed, the plating thickness is 0.005-0.01mm, and the electroplating time is adjusted according to the plating thickness; the core board must be degreased and derusted before electroplating;

[0075] d) Spraying pre-sintering: Spray the mixed powder in step b) evenly on the core plate on a spraying machine, and put it into a mesh belt furnace for sintering. The sintering temperature is 820℃, and the temperature is kept for 0.5 hours. The atmosphere is ammonia decomposition gas. Both sides of the friction plate are friction layers, and both sides are sprayed and pre-sintered in the same way.

[0076] e) groove pressing, placing the friction plate pre-sintered by spraying in step d) on a groove pressing mold and pressing the groove on a press machine;

[0077] f) Re-firing, step e) The friction plate after the groove pressing is placed in a bell furnace for pressure sintering at a pressure of 0.2 MPa, a temperature of 760°C, and a time of 1.2 hours;

[0078] g) Fine pressing: the friction plate after re-firing in step f) is placed on a flat die and pressurized on a press machine at a pressure of 125MPa. Fine pressing uses a thickness limit block with the final size of the friction plate to ensure the size of the friction plate and obtain a finished friction plate.

[0079] Since the copper-chromium-zirconium alloy powder is atomized copper-chromium-zirconium alloy, the fluidity of the copper-chromium-zirconium alloy powder is less than 20s / 50g, and the copper powder is dendritic electrolytic copper powder, the fluidity of the copper powder is close to zero. In Examples 1 to 4, since the copper-chromium-zirconium alloy powder replaces part of the electrolytic copper powder, the fluidity of the sprayed mixed powder is better than that of Comparative Example 1, thereby making the powder spreading more uniform in the spraying pre-sintering step, and the friction plate obtained has smaller corrugation and is smoother.

[0080] The friction performance of the friction plate samples prepared in Examples 1 to 4 and Comparative Example 1 was tested according to the test method specified in JB / T7909-2011. The test results are shown in Table 1 below:

[0081] Table 1: Performance test results of friction plates prepared in Examples 1 to 4 and Comparative Example 1

[0082]

[0083] According to the test results of the friction plates prepared in Examples 1 to 4 and Comparative Example 1 in Table 1, adding copper-chromium-zirconium alloy powder to the friction plate improves the matrix strength and heat resistance of the friction plate, thereby improving the friction and wear performance of the friction plate. Since the fluidity of copper-chromium-zirconium alloy powder is better than that of electrolytic copper powder, adding copper-chromium-zirconium alloy powder to the friction plate can increase the bonding performance with graphite, which is beneficial to improving the spraying process of the friction plate and making the powder spreading more uniform. The lead in Comparative Example 1 acts as a lubricant, which can improve the wear resistance and stabilize the friction performance of the friction plate. After removing the lead, the invention ensures the friction performance of the friction plate by adding molybdenum disulfide and molybdenum. The technical effect of the present invention can be seen from the test results. The friction performance of Examples 1 to 4, which add copper-chromium-zirconium alloy powder, molybdenum and molybdenum disulfide, is significantly improved compared with that of Comparative Example 1. Among them, the wear rate of the friction plate obtained in Example 4 is reduced by about 62% compared with the friction plate obtained in Comparative Example 1, and the energy load allowable value is increased by 31%. The power transmitted per unit area of ​​the friction plate is greatly improved, and the friction plate can withstand the effects of thermal load and thermal impulse for a long time. It has a long service life and is suitable for use under high speed, heavy load and high power conditions. In addition, the material does not contain lead, and the production and use process will not cause pollution and is more environmentally friendly.

[0084] The dimensions of the friction plate samples prepared in Examples 1 to 4 and Comparative Example 1 were measured, and the measurement results are shown in Table 2 below:

[0085] Table 2: Measurement results of friction plate dimensions prepared in Examples 1 to 4 and Comparative Example 1

[0086]

[0087] According to the test results of the friction plates prepared in Examples 1 to 4 and Comparative Example 1 in Table 2, in Examples 1 to 4, the friction plates were re-fired by pressureless sintering in a mesh belt furnace, the temperature was high, the temperature rose quickly, and the core plate was not completely burned through during the re-firing process, so the tooth shape deformation of the friction plates was small, and the deviation of the cross-rod distance M value of the prepared friction plates was small, only 0.12mm-0.3mm. In Comparative Example 1, the friction plates were re-fired by pressure sintering in a bell furnace, the temperature was low, the temperature rose slowly, and the core plate was completely burned through during the re-firing process, and the deviation of the cross-rod distance M value of the prepared friction plates was 0.54mm, which was large, and the tooth shape deformation of the friction plates was large. When in use, the contact area between the gear shaft and the friction plates was small.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "an implementation", "specific implementation", "other implementations", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment, implementation or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described above may also be combined in a suitable manner in any one or more embodiments, implementations or examples. The technical solutions recorded in the present invention also include technical solutions formed by any one or more of the specific features, structures, materials or characteristics described above in a separate or combined manner.

[0089] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Ordinary technicians in the field can change, modify, replace, modify, delete some features, add features or re-combine features to form a technical solution in the above embodiments without departing from the principles and purpose of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the innovative principles of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An environmentally friendly spray friction plate, characterized in that: The following components are included by weight percentage: copper 50-58%, tin 5-7%, zinc 8-12%, copper-chromium-zirconium alloy 8-12%, graphite 5-10%, zircon sand 8-12%, molybdenum disulfide 1-3%, molybdenum 1-3%; The copper-chromium-zirconium alloy powder is atomized copper-chromium-zirconium alloy powder; The above components are mixed and sprayed on the core plate, and the friction plate is pre-sintered without pressure in a mesh belt furnace. The sintering temperature is 750-850℃, and the insulation time is 0.3-0.8h. The atmosphere is ammonia decomposition gas. After the groove is pressed, the friction plate is pressurelessly sintered in a mesh belt furnace at a temperature of 800-850℃ for 1-1.5h.

2. The environmentally friendly spray friction plate according to claim 1, characterized in that: The particle size of copper is -200 mesh, the particle size of tin is -200 mesh, the particle size of zinc is -200 mesh, the particle size of graphite is -200 mesh artificial graphite, the particle size of zircon sand is -100 mesh, the particle size of copper-chromium-zirconium alloy is -100 mesh, the particle size of molybdenum is -300 mesh, and the particle size of molybdenum disulfide is -300 mesh.

3. The environmentally friendly spray friction plate according to claim 1, characterized in that: The composition includes the following components by weight percentage: 50% copper, 6% tin, 11% zinc, 10% copper-chromium-zirconium alloy, 8% graphite, 11% zircon sand, 1% molybdenum disulfide, and 3% molybdenum.

4. A method for preparing an environmentally friendly spray friction plate as claimed in any one of claims 1 to 3, characterized in that: Including the following processes: a) Ingredients: Weigh copper powder, tin powder, zinc powder, copper-chromium-zirconium alloy powder, graphite powder, zircon sand powder, molybdenum disulfide powder and molybdenum powder according to the weight of each component; b) Mixing: put the prepared powder into the mixer and mix evenly; c) Core board copper plating: The core board is copper plated by electroplating; d) Spraying pre-sintering: Sprinkle the mixed powder in step b) evenly on the core plate on a spraying machine, and put it into a mesh belt furnace to sinter both sides of the friction plate; e) Grooving, placing the friction plate pre-sintered by spraying in step d) on a groove pressing die and then pressing the groove on a press machine; f) Re-firing: placing the friction plate after the groove pressing in step e) into a mesh belt furnace for sintering; g) Precision pressing: The friction plate after re-firing in step f) is placed on a flat die and precision pressed on a press.

5. The method for preparing an environmentally friendly spray friction plate according to claim 4, characterized in that: In step b), the mixing time is 0.5-1h.

6. The method for preparing an environmentally friendly spray friction plate according to claim 4, characterized in that: In process c), the core plate is hung on the cathode, the copper plate is hung on the anode, a plating solution containing copper ions is added to the plating tank, and direct current is passed to make the plating layer thickness 0.005-0.01mm.

7. The method for preparing an environmentally friendly spray friction plate according to claim 4, characterized in that: In step d), the sintering conditions are: sintering temperature is: 750-850°C, heat preservation time is 0.3-0.8h, and the atmosphere is: ammonia decomposition gas.

8. The method for preparing an environmentally friendly spray friction plate according to claim 4, characterized in that: In step f), the grooved friction plate is placed in a mesh belt furnace for pressureless sintering at a temperature of 800°C-850°C for 1-1.5 hours.

9. The method for preparing an environmentally friendly spray friction plate according to claim 4, characterized in that: In process g), the final thickness limit block of the friction plate is used to ensure the size of the friction plate, and the pressure of the press is 100-150MPa.

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