CN112375942B - Combined type intelligence bumper shock absorber piston - Google Patents
Combined type intelligence bumper shock absorber piston Download PDFInfo
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- CN112375942B CN112375942B CN202011156364.0A CN202011156364A CN112375942B CN 112375942 B CN112375942 B CN 112375942B CN 202011156364 A CN202011156364 A CN 202011156364A CN 112375942 B CN112375942 B CN 112375942B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3214—Constructional features of pistons
Abstract
The invention relates to the technical field of automobile shock absorbers, in particular to a combined type intelligent shock absorber piston. The intelligent shock absorber piston is prepared from the following components in percentage by mass: cu: 1.5-2.5%, Mg: 1.6-2.2%, Ni: 0.8-1.2%, Fe: 1.5-2.0%, Cr: 0.7-1.0%, Si: 8-10 percent of aluminum and the balance of inevitable impurities. The high-temperature strength and the wear resistance of the piston of the shock absorber are improved to the maximum extent by adding the high-content Fe and other components to be cooperated with each other. Meanwhile, on the basis of reasonable compatibility of raw material components, according to the difference of melting points and burning loss conditions of the raw material components, the alloy liquid is prepared by adopting a smelting and plasma injection mode under specific conditions, the high-temperature strength and the mechanical property of the piston are further improved through pouring under specific conditions and heat treatment, and the prepared piston can meet the high-standard high requirements of the combined type damper only.
Description
Technical Field
The invention relates to the technical field of automobile shock absorbers, in particular to a combined type intelligent shock absorber piston.
Background
With the great improvement of the living standard of China, the automobiles in China are more and more commonly used in life, and the application amount of corresponding automobile shock absorbers is increased gradually. The shock absorber belongs to a device for reducing vibration, and is mainly used for inhibiting vibration generated when a spring rebounds after absorbing shock and impact vibration of a road surface.
The common shock absorber in the car at present is the cylinder shock absorber of two-way effect, and it can exert conventional cushioning effect, but in order to further improve the shock attenuation effect and increase driving process car security, development compound intelligent shock absorber becomes present new mainstream. The combined type intelligent shock absorber still has one set of intelligent shock mitigation system except that the function that remains traditional cylinder shock absorber, and this shock mitigation system can realize automobile shock mitigation system's self-adaptation function according to the strong and weak automatic control shock attenuation dynamics of vibration, and under lasting, the high strength vibration, better to the control of damping force, has improved the shock attenuation effect, has played the effect that promotes to take comfort level and security.
The piston of the shock absorber is fixed on a piston rod of a working cylinder of the shock absorber and matched with an inner cylinder of the working cylinder, the working cylinder is filled with oil, and the piston is also provided with a plurality of oil leakage holes which axially penetrate through a piston body. When the automobile shock absorber works, the piston moves up and down, oil above or below the piston can flow through the oil leakage hole, the oil rubs with the hole wall of the oil leakage hole, damping force for damping vibration can be generated, and the piston of the shock absorber plays an important role in the automobile shock absorption process. Besides the improvement of the piston in the design process, the used material of the piston has a great influence on the performance of the piston. The shock absorber piston is made of alloy materials due to the particularity of the working environment (high temperature, high pressure, high speed heat load and thermal fatigue), but the piston made of the existing alloy components is poor in wear resistance, the air tightness between the piston and the inner cylinder is poor after the piston works for a period of time, and meanwhile, the high-temperature strength and the mechanical property are not ideal.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a composite intelligent shock absorber piston with excellent wear resistance, high-temperature strength, mechanical property and appearance quality.
The above object of the present invention can be achieved by the following technical solutions: a composite intelligent shock absorber piston is made of the following components in percentage by mass: cu: 1.5-2.5%, Mg: 1.6-2.2%, Ni: 0.8-1.2%, Fe: 1.5-2.0%, Cr: 0.7-1.0%, Si: 8-10 percent of aluminum and the balance of inevitable impurities.
The proper amount of Cu is added into the raw material of the piston of the shock absorber, so that the phase transformation of the Ni-rich strengthening phase can be promoted, the appearance and the microstructure of a precipitated phase are changed, the change can play a role of fine grain strengthening, and the mechanical property of the piston can be improved. But the Cu content is not suitable to exceed 2.5 percent, otherwise, the surface of the piston product is easy to crack, and the yield is higherLow, causing resource waste. Reasonable Mg added to the raw material forms a plurality of stable phases together with other raw material components, such as Mg2Si phase, Al5Si6Cu2Mg8And the same, contribute to the improvement of the tensile strength and yield strength of the piston after heat treatment. The added Ni and Cu have the mutual propulsion function, the Cu can promote the phase transformation of the Ni-rich strengthening phase, and the Ni can form an Al-Ni-Cu and Al-Cu-Ni ternary system with the Cu and the Al, so that the age hardening speed of the alloy is accelerated, and the high-temperature strength of the piston is improved. The conventional aluminum alloy system requires that the iron content is as good as possible, the Fe content is usually controlled below 0.2% as impurities, and the raw materials of the invention adopt high-content Fe to form an Fe-Si phase with Si, so that the high-temperature strength of the piston can be greatly improved. Considering the adverse effect that high content of Fe may cause to piston products, the invention adds a small amount of Cr in the raw materials, which can form alpha-Al (Fe, Cr) Si phase with Fe, Al and Si, on one hand, the invention can prevent the excessive Fe phase in the alloy liquid from separating out, reduce the hot cracking tendency, on the other hand, the alpha-Al (Fe, Cr) Si phase can easily combine with Ni-rich strengthening to play the auxiliary strengthening role.
Preferably, the mass ratio of Ni, Fe, and Cr satisfies Ni + Cr ═ Fe. The mass ratio of Ni, Fe and Cr is proportioned according to the equation, so that the cracking of a piston product caused by the precipitation of an Fe phase can be avoided, and the high-temperature strength of the piston can be ensured to the maximum extent.
The invention also aims to provide a preparation method of the composite intelligent shock absorber piston, which comprises the following steps:
s1, weighing the piston raw materials in percentage by mass: cu powder, Mg powder, Ni powder, reduced Fe powder, Cr powder, Si powder and aluminum powder for later use;
s2, firstly, placing aluminum powder in a smelting furnace to be smelted into pure aluminum liquid at the temperature of 680-plus 760 ℃, then, keeping the temperature of the aluminum liquid of 680-plus 760 ℃, sequentially spraying Cu powder, Si powder, Ni powder, reduction Fe powder and Cr powder to the pure aluminum liquid through plasma, stirring for 20-30min after spraying one component, finally, adding Mg powder to smelt, stirring for 10-15min, refining and slagging off to obtain alloy liquid;
s3, pouring the alloy liquid in a mould for molding;
and S4, carrying out solid solution aging treatment on the cast blank to obtain the damper piston.
The melting points of Cu, Si, Ni, Fe and Cr in the raw materials of the piston are greatly different from that of aluminum, a direct smelting mode is adopted, the smelting temperature is difficult to control, the smelting temperature is set according to the melting point of 660 ℃ of pure aluminum, the raw materials with high melting points such as Si, Ni, Fe and Cr and the like or high-melting point intermetallic compounds formed by the raw materials are difficult to completely melt, semisolid Si, Ni, Fe, Cr or intermetallic compounds exist in alloy liquid, the appearance and the performance of an alloy solidification structure are influenced, and finally, the compactness of the piston product is poor and cracks are easy to appear; in order to melt a high-melting-point raw material, the melting temperature is set to exceed 1000 ℃, and the matrix aluminum is oxidized greatly due to overheating and overburning, so that the forming is difficult. In order to break the adverse effect brought by the traditional smelting mode, according to different melting points of raw material powder, the invention adopts the injection process under specific conditions to inject Cu (the melting point is about 1083 ℃), Si (the melting point is about 1410 ℃), Ni (the melting point is about 1453 ℃), Fe (the melting point is about 1535 ℃) and Cr (the melting point is about 1857 ℃) into the smelted pure aluminum liquid in sequence. Considering that the melting point of Mg in the raw material components is close to that of Al and the raw material components are easy to burn, the Mg is selected to be put into aluminum liquid which is finally added and is kept at 680-760 ℃ for smelting.
Preferably, the particle diameters of the Cu powder, the Si powder, the Ni powder, the reduced Fe powder and the Cr powder are all 160-180 meshes.
Preferably, the plasma injection power is 8-10KW, the powder feeding voltage is 9-12V, the current is 120-150A, and the powder feeding speed is 140-160 m/s. The process conditions are suitable for the high-melting-point raw material powders, the injection parameters are not required to be repeatedly adjusted, the time is saved, the efficiency is improved, and meanwhile, Cu, Si, Fe, Ni and Cr which are relatively completely purified and have relatively high kinetic energy can be obtained under the process conditions,under the promotion of kinetic energy, molten Cu, Si, Fe, Ni and Cr impact the aluminum liquid at high speed, and break through the surface tension of the liquid and enter the aluminum liquid for reaction. A large number of experiments show that once the upper limit of the injection parameter of the invention exceeds the maximum range value, the kinetic energy obtained by the molten Cu, Si, Fe, Ni and Cr is too large, so that the upper layer of molten aluminum is sputtered during injection, and meanwhile, the reaction temperature of the molten material and the molten aluminum is too high, the reaction speed is too high, and especially, acicular Al can be generated by the Fe and the molten aluminum3Fe, which seriously affects the mechanical property of the piston.
Preferably, the working gas adopted by the plasma injection is nitrogen and hydrogen, and the volume ratio of the nitrogen to the hydrogen is (25-32): 1. in the invention, nitrogen in the working gas is used as a protective gas to protect the metal powder from being oxidized, and hydrogen is used as an auxiliary gas to conduct electricity.
Preferably, the refining agent adopted by the refining consists of KCl and Na2SiF4According to the mass ratio (6.5-8): 1 are compounded.
Preferably, the preheating temperature of the mold in the casting process is 200-300 ℃, and the casting temperature is 680-720 ℃. The numerical value within the condition range is adopted for pouring, so that the fastening shrinkage porosity tendency of a casting product can be eliminated, the solidification speed of alloy liquid is accelerated to obtain a finer crystalline structure, the oxidation air suction tendency is reduced, and the mechanical property and the appearance quality of the piston are improved.
Preferably, the solution aging treatment is 480-.
Compared with the prior art, the invention has the following beneficial effects:
1. the high-temperature strength and the wear resistance of the piston of the shock absorber are improved to the maximum extent by adding the high-content Fe and other components into the raw material components to cooperate with each other.
2. On the basis of reasonable compatibility of raw material components, according to the difference of melting points and burning loss conditions of the raw material components, the alloy liquid is prepared by adopting a smelting and plasma injection mode under specific conditions, and then the high-temperature strength and the mechanical property of the piston are further improved through pouring under specific conditions and heat treatment.
Detailed Description
The following are specific examples of the present invention and illustrate the technical solutions of the present invention for further description, but the present invention is not limited to these examples. Unless otherwise specified, the raw materials involved in the examples of the present invention are those commonly used in the art, and the methods involved are conventional methods.
Example 1
A composite intelligent shock absorber piston is prepared according to the following steps:
s1, weighing the piston raw materials in percentage by mass: 1.5% of Cu powder, 1.6% of Mg powder, 0.8% of Ni powder, 1.5% of reduced Fe powder, 0.7% of Cr powder, 8% of Si powder and the balance of aluminum powder for later use;
s2, firstly, placing aluminum powder in a smelting furnace to be smelted into pure aluminum liquid at 680 ℃, then keeping the aluminum liquid at 680 ℃, sequentially injecting Cu powder, Si powder, Ni powder, reduced Fe powder and Cr powder with the particle sizes of 160-plus-180 meshes into the pure aluminum liquid through plasma, stirring for 20min every injection of one component, finally adding Mg powder to smelt, stirring for 10min, refining and slagging off to obtain alloy liquid; the plasma jet power is 8KW, the powder feeding voltage is 9V, the current is 120A, the powder feeding speed is 140m/s, and the refined refining agent is formed by KCl and Na2SiF4According to the mass ratio of 6.5: 1, compounding;
s3, preheating the die, and then pouring the alloy liquid into the die for molding, wherein the preheating temperature of the die is 200 ℃, and the pouring temperature is 680 ℃;
and S4, carrying out solution treatment at 480 ℃/1h and aging treatment at 130 ℃/12h on the cast blank to obtain the shock absorber piston.
Example 2
A composite intelligent shock absorber piston is prepared according to the following steps:
s1, weighing the piston raw materials in percentage by mass: 1.8% of Cu powder, 1.7% of Mg powder, 0.9% of Ni powder, 1.7% of reduced Fe powder, 0.8% of Cr powder, 8.5% of Si powder and the balance of aluminum powder for later use;
s2, firstly, placing aluminum powder in a smelting furnace to be smelted into pure aluminum liquid at 700 ℃, then keeping the aluminum liquid at 700 ℃, sequentially injecting Cu powder, Si powder, Ni powder, reduced Fe powder and Cr powder with the particle sizes of 160-plus-180 meshes into the pure aluminum liquid by plasma, stirring for 23min after every injection of one component, and finally addingAdding Mg powder, smelting, stirring for 12min, refining, and removing slag to obtain alloy liquid; the plasma jet power is 8.5KW, the powder feeding voltage is 9.5V, the current is 130A, the powder feeding speed is 145m/s, and the refined refining agent is composed of KCl and Na2SiF4According to the mass ratio of 7: 1, compounding;
s3, preheating the die, and then pouring the alloy liquid into the die for molding, wherein the preheating temperature of the die is 230 ℃, and the pouring temperature is 690 ℃;
and S4, carrying out solution treatment at a rate of 485 ℃/1h and aging treatment at a rate of 135 ℃/15h on the cast blank to obtain the shock absorber piston.
Example 3
A composite intelligent shock absorber piston is prepared according to the following steps:
s1, weighing the piston raw materials in percentage by mass: 2% of Cu powder, 1.7% of Mg powder, 1% of Ni powder, 1.8% of reduced Fe powder, 0.8% of Cr powder, 9% of Si powder and the balance of aluminum powder for later use;
s2, firstly, placing aluminum powder in a smelting furnace to be smelted into pure aluminum liquid at 720 ℃, then, keeping the temperature of the aluminum liquid at 720 ℃, sequentially injecting Cu powder, Si powder, Ni powder, reduced Fe powder and Cr powder with the particle sizes of 160 plus 180 meshes into the pure aluminum liquid through plasma, stirring for 25min for each component injected, finally, adding Mg powder to smelt, stirring for 13min, refining and slagging off to obtain alloy liquid; the plasma jet power is 9KW, the powder feeding voltage is 10V, the current is 135A, the powder feeding speed is 150m/s, and the refined refining agent is formed by KCl and Na2SiF4According to the mass ratio of 7.5: 1, compounding;
s3, preheating the die, and then pouring the alloy liquid into the die for molding, wherein the preheating temperature of the die is 250 ℃, and the pouring temperature is 700 ℃;
and S4, carrying out solution treatment at 490 ℃/2h and aging treatment at 140 ℃/18h on the cast blank to obtain the shock absorber piston.
Example 4
A composite intelligent shock absorber piston is prepared according to the following steps:
s1, weighing the piston raw materials in percentage by mass: 2.3% of Cu powder, 2% of Mg powder, 1.2% of Ni powder, 1.9% of reduced Fe powder, 0.7% of Cr powder, 9.5% of Si powder and the balance of aluminum powder for later use;
s2, firstly, placing aluminum powder in a smelting furnace to be smelted into pure aluminum liquid at 750 ℃, then, keeping the temperature of the aluminum liquid at 750 ℃, sequentially injecting Cu powder, Si powder, Ni powder, reduced Fe powder and Cr powder with the particle sizes of 160 plus 180 meshes into the pure aluminum liquid through plasma, stirring for 28min for each component, finally, adding Mg powder to smelt, stirring for 14min, refining and slagging off to obtain alloy liquid; the plasma jet power is 9.5KW, the powder feeding voltage is 11V, the current is 145A, the powder feeding speed is 155m/s, and the refined refining agent is composed of KCl and Na2SiF4According to the mass ratio of 7.5: 1, compounding;
s3, preheating the die, and then pouring the alloy liquid into the die for molding, wherein the preheating temperature of the die is 290 ℃, and the pouring temperature is 710 ℃;
and S4, carrying out solution treatment at 490 ℃/1h and aging treatment at 145 ℃/22h on the cast blank to obtain the shock absorber piston.
Example 5
A composite intelligent shock absorber piston is prepared according to the following steps:
s1, weighing the piston raw materials in percentage by mass: 2.5% of Cu powder, 2.2% of Mg powder, 1% of Ni powder, 2.0% of reduced Fe powder, 1% of Cr powder, 10% of Si powder and the balance of aluminum powder for later use;
s2, firstly, placing aluminum powder in a smelting furnace to be smelted into pure aluminum liquid at 760 ℃, then, keeping the temperature of the aluminum liquid at 760 ℃, sequentially injecting Cu powder, Si powder, Ni powder, reduced Fe powder and Cr powder with the particle sizes of 160 plus 180 meshes into the pure aluminum liquid through plasma, stirring for 30min every time one component is injected, finally, adding Mg powder to smelt, stirring for 15min, refining and slagging off to obtain alloy liquid; the plasma jet power is 10KW, the powder feeding voltage is 12V, the current is 150A, the powder feeding speed is 160m/s, and the refining agent is KCl and Na2SiF4According to the mass ratio of 8: 1, compounding;
s3, preheating the die, and then pouring the alloy liquid into the die for molding, wherein the preheating temperature of the die is 300 ℃, and the pouring temperature is 720 ℃;
and S4, carrying out solution treatment at 500 ℃/2h and aging treatment at 150 ℃/24h on the cast blank to obtain the shock absorber piston.
Comparative example 1
The only difference from example 3 is that the starting material components do not contain Fe.
Comparative example 2
The difference from example 3 is only that the raw material composition contains 0.6% of Cr, and the mass ratio of Ni + Cr ≠ Fe
Comparative example 3
The only difference from example 3 is that all the raw materials are fed into the melting furnace for melting.
Comparative example 4
The difference from example 3 was only that the plasma jet power was 12KW, the powder feeding voltage was 13V, the current was 160A, and the powder feeding speed was 170 m/s.
Comparative example 5
The only difference from example 3 is that the casting mold is not preheated.
The piston of the shock absorbers manufactured in examples 1 to 5 and comparative examples 1 to 5 were subjected to the performance test, and the results are shown in the following table 1:
table 1: piston performance results for shock absorbers prepared in examples 1 to 5 and comparative examples 1 to 5
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
Claims (4)
1. The composite intelligent shock absorber piston is characterized by being prepared from the following components in percentage by mass: cu: 1.5-2.5%, Mg: 1.6-2.2%, Ni: 0.8-1.2%, Fe: 1.5-2.0%, Cr: 0.7-1.0%, Si: 8-10% of aluminum and inevitable impurities as the rest;
the mass ratio of Ni, Fe and Cr satisfies Ni + Cr = Fe;
the preparation method of the intelligent shock absorber piston comprises the following steps:
s1, weighing the piston raw materials in percentage by mass: cu powder, Mg powder, Ni powder, reduced Fe powder, Cr powder, silicon powder and aluminum powder for later use;
s2, firstly, placing aluminum powder in a smelting furnace to be smelted into pure aluminum liquid at the temperature of 680-plus 760 ℃, then, keeping the temperature of the aluminum liquid of 680-plus 760 ℃, sequentially injecting Cu powder, silicon powder, Ni powder, reduction Fe powder and Cr powder into the pure aluminum liquid through plasma, stirring for 20-30min after each injection of one component, finally, adding Mg powder to smelt, stirring for 10-15min, refining and slagging off to obtain alloy liquid;
s3, pouring the alloy liquid in a mould for molding;
s4, carrying out solid solution aging treatment on the cast blank to obtain the damper piston;
in the step S2, the plasma injection power is 8-10kW, the powder feeding voltage is 9-12V, the current is 150A-;
step S3, preheating the mold at 300 ℃ and 680 ℃ in the casting process;
the step S4 is solution aging treatment at 500 ℃/1-2h +130 ℃/150 ℃/12-24 h.
2. The piston as claimed in claim 1, wherein the particle sizes of Cu powder, Si powder, Ni powder, reduced Fe powder and Cr powder in step S1 are all 180 meshes 160-180.
3. The piston of claim 1, wherein the working gas for plasma injection in step S2 is nitrogen and hydrogen, and the volume ratio of the two is (25-32): 1.
4. the piston for a hybrid intelligent shock absorber according to claim 1, wherein the refining agent used in the refining in step S2 is KCl and Na2SiF4According to the mass ratio (6.5-8): 1 are compounded.
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