A high-wear-resistance piston rod based on gas spring and a preparation method thereof

Abstract

The application relates to the technical field of piston rods, in particular to a high-wear-resistance piston rod based on a gas spring and a preparation method thereof. The application comprises the following steps: S1, pretreating a piston rod by removing oil and grease, cleaning and drying to obtain a pretreated piston rod; S2, forming a cladding layer by cladding cladding powder on the surface of the pretreated piston rod through a laser cladding process; S3, uniformly mixing epoxy resin and dimethylbenzene, adding a composite, a curing agent, a leveling agent and a defoaming agent to obtain wear-resistant paint; and S4, coating the wear-resistant paint on the surface of the cladding layer, drying and curing to form a wear-resistant coating and obtain the high-wear-resistance piston rod. The high-wear-resistance piston rod prepared by the application has excellent wear resistance and surface hardness, and can effectively reduce the friction coefficient, thereby prolonging the service life.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of a piston rod, in particular to a high-wear-resistance piston rod based on a gas spring and a preparation method thereof. BACKGROUND

[0002] With the rapid development of modern industry, especially in the fields of automobiles, engineering machinery and aerospace, gas springs are widely used as an important elastic element. The performance of the gas spring directly affects the stability and service life of the entire mechanical system. The piston rod, as one of the core components of the gas spring, is particularly important in terms of wear resistance, strength and toughness.

[0003] Traditional piston rods are mostly made of ordinary steel, which has certain strength and rigidity, but is prone to performance degradation and even fracture due to friction and wear during long-term reciprocating motion. In addition, the surface treatment technology of traditional piston rods is limited and cannot meet the requirements of high wear resistance. At present, the surface treatment of piston rods in China mainly relies on the traditional electroplating chromium process. However, this technology causes serious environmental pollution during production and use.

[0004] Therefore, we propose a high-wear-resistance piston rod based on a gas spring and a preparation method thereof. SUMMARY

[0005] The purpose of the present application is to provide a high-wear-resistance piston rod based on a gas spring and a preparation method thereof to solve the problems in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A preparation method of a high-wear-resistance piston rod based on a gas spring, comprising the following steps:

[0008] Step S1: degreasing and cleaning the piston rod, drying the piston rod to obtain a pretreated piston rod;

[0009] Step S2: forming a cladding layer by cladding the cladding powder on the surface of the pretreated piston rod through a laser cladding process;

[0010] Step S3: mixing the epoxy resin and dimethylbenzene uniformly, adding the composite, curing agent, leveling agent and defoaming agent and mixing them uniformly to obtain wear-resistant paint;

[0011] Step S4: coating the wear-resistant paint on the surface of the cladding layer, drying and curing to form a wear-resistant coating, and obtaining a high-wear-resistance piston rod.

[0012] Further, the cladding powder is an iron-based alloy powder.

[0013] Further, in the step S2, the laser cladding process conditions are: laser power 3500-4500W, cladding speed 10-100m / min, spot diameter 2-5mm, and overlap rate 40-50%.

[0014] Further, in the step S2, the thickness of the cladding layer is 0.5-2.0mm.

[0015] Further, the wear-resistant coating is composed of the following components in parts by weight: epoxy resin 50-60 parts, xylene 25-50 parts, composite 15-25 parts, curing agent 5-10 parts, leveling agent 0.1-0.3 parts, and defoaming agent 0.1-0.2 parts.

[0016] Further, the preparation method of the composite is as follows:

[0017] The tannic acid and deionized water are uniformly mixed, 4-formylphenylboronic acid is added and uniformly mixed, and the reaction is carried out for 2-4h, filtration is performed, and a borate ester compound is obtained;

[0018] The aminated molybdenum disulfide, aminated silicon carbide and deionized water are uniformly mixed, the borate ester compound and acetic acid are added, and the reaction is carried out at 75-85℃ for 4-6h, and the composite is obtained after filtration, washing and drying.

[0019] In the above technical solution, the aldehyde group is introduced by the reaction of tannic acid and 4-formylphenylboronic acid to obtain a borate ester compound; the aminated molybdenum disulfide and aminated silicon carbide are uniformly mixed, and Schiff base reaction occurs between the amino group and the aldehyde group on the borate ester compound to prepare the composite, which has good anti-wear performance and lubricating performance.

[0020] Further, the mass ratio of the tannic acid, deionized water and 4-formylphenylboronic acid is 1:(15-20):(0.5-1.0).

[0021] Further, the composite is composed of the following components in parts by weight: aminated silicon carbide 5-10 parts, aminated molybdenum disulfide 10-15 parts, borate ester compound 15-25 parts, acetic acid 4-8 parts, and deionized water 50-70 parts.

[0022] Further, the preparation method of the aminated silicon carbide is as follows:

[0023] Step (1): 2,4,6-triaminopyrimidine and dimethyl sulfoxide are uniformly mixed, 3-(2,3-epoxypropoxy)propyltrimethoxysilane is added, and the reaction is carried out at 40-50℃ for 6-8h, and the modified pyrimidine is obtained by reduced pressure distillation.

[0024] Step (2): mixing silicon carbide, absolute ethanol, deionized water and modified pyrimidine uniformly, reacting at 50-60℃ for 4-6h, and then obtaining aminated silicon carbide after filtration, washing and drying.

[0025] Further, in the step (1), the mass ratio of 2,4,6-triaminopyrimidine, 3-(2,3-epoxypropoxy) propyl trimethoxysilane and dimethyl sulfoxide is 1:(2-3):(12-15).

[0026] Further, in the step (2), the mass ratio of silicon carbide, absolute ethanol, deionized water and modified pyrimidine is 1:(15-20):(3-5):(2-4).

[0027] In the above technical solution, the epoxy group at one end of 3-(2,3-epoxypropoxy) propyl trimethoxysilane reacts with the amino group of 2,4,6-triaminopyrimidine to form a chemical bond through the hydrolysis of the other end of the silane and the condensation reaction with the hydroxyl group on the surface of silicon carbide; at the same time, by adjusting the ratio of 2,4,6-triaminopyrimidine and 3-(2,3-epoxypropoxy) propyl trimethoxysilane, the remaining amino group on the surface of the aminated silicon carbide is reserved, and the aminated silicon carbide is obtained.

[0028] Further, the preparation method of the aminated molybdenum disulfide is as follows:

[0029] Step A: under air condition, molybdenum disulfide is kept at 340-360℃ for 2-6h to obtain oxygen-etched molybdenum disulfide;

[0030] Step B: mixing oxygen-etched molybdenum disulfide, sodium hydroxide and deionized water uniformly, and then centrifuging after hydrothermal reaction, washing and drying to obtain pretreated molybdenum disulfide;

[0031] Step C: mixing pretreated molybdenum disulfide and deionized water uniformly, adding L-cysteine, ultrasonic treatment for 3-5h, and then continuing to stir for 22-24h, and then obtaining aminated molybdenum disulfide after filtration, washing and drying.

[0032] Further, the mass ratio of oxygen-etched molybdenum disulfide, sodium hydroxide and deionized water is 1:(1-2):(50-60).

[0033] Further, the process condition of the hydrothermal reaction is that the reaction is carried out at 200-220℃ for 6-8h.

[0034] Further, the mass ratio of pretreated molybdenum disulfide, L-cysteine and deionized water is 1:(1-2):(20-30).

[0035] In the technical scheme, the molybdenum disulfide (MoS2) has a smooth surface and no active functional groups, the MoS2 is subjected to oxygen etching in air, then subjected to NaOH hydrothermal treatment, to obtain MoS2 containing vacancies and defects, then the S vacancies of the MoS2 are subjected to amino modification through mercapto groups on L-cysteine, to obtain aminated molybdenum disulfide.

[0036] Further, the concentration of the acetic acid is 0.1 mol / L.

[0037] Further, the coating process condition is that: a spraying mode is adopted, the spraying pressure is 4-6 MPa, the spraying distance is 230-250 mm, and the moving speed is 5-10 m / min.

[0038] Further, the thickness of the wear-resistant coating is 50-150 mu m.

[0039] Compared with the prior art, the present application has the following beneficial effects:

[0040] 1. The high-wear-resistance piston rod based on gas springs and the preparation method thereof, the aminated molybdenum disulfide is prepared by a three-step method, first, the MoS2 is subjected to oxygen etching in air, then subjected to NaOH hydrothermal treatment, to obtain MoS2 containing vacancies and defects, then the S vacancies of the MoS2 are subjected to amino modification through mercapto groups on L-cysteine, to successfully load the L-cysteine on the MoS2, to obtain aminated molybdenum disulfide;

[0041] The epoxy group at one end of 3-(2,3-epoxypropoxy) propyl trimethoxysilane is subjected to ring-opening reaction with the amino group of 2,4,6-triaminopyrimidine, then through the hydrolysis of the alkoxyl group (-OCH3) at the other end of the silane, chemical bonding is formed with silicon carbide, heterocyclic compound pyrimidine is introduced, the number of rigid structures is increased, and thus the hardness of the material is improved; meanwhile, by adjusting the ratio relationship between 2,4,6-triaminopyrimidine and 3-(2,3-epoxypropoxy) propyl trimethoxysilane, the remaining amino groups can be reserved on the surface of the aminated silicon carbide, and thus the aminated silicon carbide is obtained.

[0042] The aldehyde group is introduced by the reaction of tannic acid and 4-formylphenylboronic acid to obtain a borate ester compound, and the borate ester compound generates a composite film through tribochemical reaction in the grinding process to play the roles of friction reduction and wear resistance; the amino molybdenum disulfide and the amino silicon carbide are uniformly mixed, and the Schiff base reaction occurs between the amino group and the aldehyde group on the borate ester compound to prepare the composite, so that the effective combination of the amino molybdenum disulfide, the amino silicon carbide and the borate ester compound is realized, and the lubricating performance of the molybdenum disulfide, the wear resistance of the silicon carbide and the friction reduction effect of the borate ester compound are combined, especially under high load and high friction conditions, so that the durability and service life of the piston rod are significantly improved.

[0043] 2. The high-wear-resistance piston rod based on a gas spring and the preparation method thereof can prepare a cladding layer by using a laser cladding process, can form a uniform and dense coating layer, can form a firm metallurgical combination with a base body, the coating layer has excellent wear resistance and corrosion resistance, the wear-resistant coating material is coated, and the surface hardness and wear resistance of the coating layer are further enhanced, so that the piston rod can effectively prevent wear in a high-friction environment. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0045] In the embodiment, the iron-based alloy powder is Fe50 with a particle size of 45 mu m and is from Xindun Alloy Welding Material Spraying Co., Ltd. in Nangong City; the molybdenum disulfide has a particle size of 1250 mesh and is from Jinan Ruixin Chemical Co., Ltd.; the silicon carbide has a particle size of 500 mesh and is from Zhengzhou Xinli Wear-resistant Material Co., Ltd.; the leveling agent is KYC-615; the defoaming agent is BYK-028; the curing agent is polyamide 650 and is from Jinan Langsheng New Material Co., Ltd.; and the piston rod is made of 316L stainless steel and is from Wuxi Jingheng Hydraulic Component Co., Ltd.

[0046] In the following examples and comparative examples, 1 part is equal to 10 g.

[0047] Example 1: A preparation method of a high-wear-resistance piston rod based on a gas spring, comprising the following processes:

[0048] Step S1: After the piston rod is degreased, cleaned and dried, a pretreated piston rod is obtained;

[0049] Step S2: iron-based alloy powder is cladded on the surface of the pretreated piston rod by a laser cladding process (laser power 3500 W, cladding speed 10 m / min, spot diameter 2 mm, and overlap rate 40%), to form a cladding layer;

[0050] Step S3: 50 parts of epoxy resin and 25 parts of dimethylbenzene are uniformly mixed, 15 parts of a composite, 5 parts of a curing agent, 0.1 part of a leveling agent, and 0.1 part of a defoaming agent are added and uniformly mixed to obtain a wear-resistant coating;

[0051] Step S4: the wear-resistant coating is coated on the cladding layer (in the form of spraying, spraying pressure 4 MPa, spraying distance 230 mm, and moving speed 5 m / min), and after drying and curing, a wear-resistant coating layer is formed, to obtain a high-wear-resistance piston rod;

[0052] The preparation method of the composite is as follows:

[0053] 20 parts of tannic acid and 300 parts of deionized water are uniformly mixed, 10 parts of 4-formylphenylboronic acid are added and uniformly mixed, and reacted for 2 h, and then filtered to obtain a borate ester compound;

[0054] 5 parts of aminosilicon carbide, 10 parts of aminomolybdenum disulfide, and 50 parts of deionized water are uniformly mixed, 15 parts of the borate ester compound and 4 parts of 0.1 mol / L acetic acid are added, and reacted at 75°C for 4 h, and then filtered, washed, and dried to obtain the composite;

[0055] The preparation method of the aminosilicon carbide is as follows:

[0056] Step (1): 10 parts of 2,4,6-triaminopyrimidine and 120 parts of dimethyl sulfoxide are uniformly mixed, 20 parts of 3-(2,3-epoxypropoxy)propyltrimethoxysilane are added, and reacted at 40°C for 6 h, and then distilled under reduced pressure to obtain a modified pyrimidine;

[0057] Step (2): 5 parts of silicon carbide, 75 parts of anhydrous ethanol, 15 parts of deionized water, and 10 parts of the modified pyrimidine are uniformly mixed, and reacted at 50°C for 4 h, and then filtered, washed, and dried to obtain the aminosilicon carbide;

[0058] The preparation method of the aminomolybdenum disulfide is as follows:

[0059] Step A: 10 parts of molybdenum disulfide is placed in a tube furnace under air conditions, and kept at 340°C for 6 h to obtain oxygen-etched molybdenum disulfide;

[0060] Step B: 10 parts of the oxygen-etched molybdenum disulfide, 10 parts of sodium hydroxide, and 500 parts of deionized water are uniformly mixed, poured into a polytetrafluoroethylene-lined high-pressure reaction kettle, and reacted at 200°C for 6 h, and then centrifuged, washed, and dried to obtain the pretreated molybdenum disulfide;

[0061] Step C: 10 parts of pretreated molybdenum disulfide and 200 parts of deionized water were mixed uniformly, 10 parts of L-cysteine was added, ultrasonic treatment was carried out for 3 h, and stirring was continued for 22 h. After filtration, washing and drying, the amino molybdenum disulfide was obtained.

[0062] Example 2: A preparation method of a high-wear-resistance piston rod based on a gas spring, comprising the following processes:

[0063] Step S1: After the piston rod was degreased, cleaned and dried, a pretreated piston rod was obtained;

[0064] Step S2: The iron-based alloy powder was cladded on the surface of the pretreated piston rod by a laser cladding process (laser power 4000 W, cladding speed 50 m / min, spot diameter 3 mm, and overlap rate 45%), to form a cladding layer;

[0065] Step S3: 55 parts of epoxy resin and 40 parts of dimethylbenzene were mixed uniformly, 20 parts of a composite, 8 parts of a curing agent, 0.2 parts of a leveling agent and 0.15 parts of a defoaming agent were added and mixed uniformly, to obtain a wear-resistant coating;

[0066] Step S4: The wear-resistant coating was coated on the cladding layer (by spraying, spraying pressure 5 MPa, spraying distance 240 mm, and moving speed 9 m / min), and after drying and curing, a wear-resistant coating layer was formed, to obtain a high-wear-resistance piston rod;

[0067] The preparation method of the composite is as follows:

[0068] 20 parts of tannic acid and 360 parts of deionized water were mixed uniformly, 16 parts of 4-formylphenylboronic acid was added and mixed uniformly, and reacted for 3 h. Filtration was performed to obtain a borate ester compound;

[0069] 8 parts of aminated silicon carbide, 12 parts of aminated molybdenum disulfide and 60 parts of deionized water were mixed uniformly, 20 parts of the borate ester compound and 6 parts of 0.1 mol / L acetic acid were added, and reacted at 80°C for 5 h. After filtration, washing and drying, a composite was obtained.

[0070] The preparation method of the aminated silicon carbide is as follows:

[0071] Step (1): 24 parts of 2,4,6-triaminopyrimidine and 312 parts of dimethyl sulfoxide were mixed uniformly, 60 parts of 3-(2,3-epoxypropoxy)propyltrimethoxysilane was added, and reacted at 45°C for 7 h. After vacuum distillation, a modified pyrimidine was obtained.

[0072] Step (2): 8 parts of silicon carbide, 144 parts of anhydrous ethanol, 32 parts of deionized water and 24 parts of the modified pyrimidine were mixed uniformly, and reacted at 55°C for 5 h. After filtration, washing and drying, aminated silicon carbide was obtained.

[0073] The preparation method of the amino-modified molybdenum disulfide is as follows:

[0074] Step A: 12 parts of molybdenum disulfide were placed in a tube furnace under air condition, and kept at 350℃ for 4h to obtain oxygen-etched molybdenum disulfide;

[0075] Step B: 12 parts of oxygen-etched molybdenum disulfide, 18 parts of sodium hydroxide and 660 parts of deionized water were uniformly mixed, poured into a polytetrafluoroethylene-lined high-pressure reaction kettle, and reacted at 210℃ for 7h. After centrifugal separation, washing and drying, pretreated molybdenum disulfide was obtained;

[0076] Step C: 12 parts of pretreated molybdenum disulfide and 300 parts of deionized water were uniformly mixed, 18 parts of L-cysteine was added, ultrasonic treatment was carried out for 4h, and stirring was continued for 23h. After filtration, washing and drying, amino-modified molybdenum disulfide was obtained.

[0077] Example 3: A preparation method of a high-wear-resistance piston rod based on a gas spring, comprising the following processes:

[0078] Step S1: After the piston rod is degreased, cleaned and dried, a pretreated piston rod is obtained;

[0079] Step S2: Iron-based alloy powder is cladded on the surface of the pretreated piston rod by a laser cladding process (laser power 4500W, cladding speed 100m / min, spot diameter 5mm, and overlap rate 50%), to form a cladding layer;

[0080] Step S3: 60 parts of epoxy resin and 50 parts of dimethylbenzene are uniformly mixed, 25 parts of a composite, 10 parts of a curing agent, 0.3 parts of a leveling agent and 0.2 parts of a defoaming agent are uniformly mixed, to obtain a wear-resistant coating;

[0081] Step S4: The wear-resistant coating is coated on the cladding layer (by spraying, spraying pressure 6MPa, spraying distance 250mm, and moving speed 10m / min), and after drying and curing, a wear-resistant coating layer is formed, to obtain a high-wear-resistance piston rod;

[0082] The preparation method of the composite is as follows:

[0083] 20 parts of tannic acid and 400 parts of deionized water are uniformly mixed, 20 parts of 4-formylphenylboronic acid is added and uniformly mixed, and reacted for 4h. After filtration, a borate ester compound is obtained;

[0084] 10 parts of amino-modified silicon carbide, 15 parts of amino-modified molybdenum disulfide and 70 parts of deionized water are uniformly mixed, 25 parts of the borate ester compound and 8 parts of 0.1mol / L acetic acid are added, and reacted at 85℃ for 6h. After filtration, washing and drying, a composite is obtained;

[0085] The preparation method of the aminated silicon carbide is as follows:

[0086] Step (1): 2, 4, 6-triaminopyrimidine and dimethyl sulfoxide are uniformly mixed, 3- (2, 3-epoxypropoxy) propyl trimethoxysilane is added, and the mixture is reacted at 40-50℃ for 6-8h, and then distilled under reduced pressure to obtain a modified pyrimidine;

[0087] Step (2): Silicon carbide, anhydrous ethanol, deionized water and modified pyrimidine are uniformly mixed, and the mixture is reacted at 60℃ for 6h, and then filtered, washed and dried to obtain aminated silicon carbide;

[0088] The preparation method of the aminated molybdenum disulfide is as follows:

[0089] Step A: 15 parts of molybdenum disulfide are placed in a tube furnace under air condition, and kept at 360℃ for 2h to obtain oxygen-etched molybdenum disulfide;

[0090] Step B: 15 parts of oxygen-etched molybdenum disulfide, 30 parts of sodium hydroxide and 900 parts of deionized water are uniformly mixed, poured into a polytetrafluoroethylene-lined high-pressure reaction kettle, and reacted at 220℃ for 8h, then centrifuged, washed and dried to obtain pretreated molybdenum disulfide;

[0091] Step C: 15 parts of pretreated molybdenum disulfide and 450 parts of deionized water are uniformly mixed, 30 parts of L-cysteine is added, ultrasonic treatment is carried out for 5h, and then stirring is continued for 24h, and then filtered, washed and dried to obtain aminated molybdenum disulfide.

[0092] Comparative Example 1: A preparation method of a high-wear-resistance piston rod based on gas springs, comprising the following processes:

[0093] Comparative Example 1 does not add aminated molybdenum disulfide in the composite, and the other steps are the same as those in Example 2.

[0094] Comparative Example 2: A preparation method of a high-wear-resistance piston rod based on gas springs, comprising the following processes:

[0095] Comparative Example 2 replaces the aminated silicon carbide with the same mass of silicon carbide compared with Example 2, and the other steps are the same as those in Example 2.

[0096] Comparative Example 3: A preparation method of a high-wear-resistance piston rod based on gas springs, comprising the following processes:

[0097] The preparation method of the aminated silicon carbide is as follows:

[0098] Step (1): 24 parts of 2, 4, 6-triaminopyrimidine and 312 parts of dimethyl sulfoxide are uniformly mixed, 144 parts of 3- (2, 3-epoxypropoxy) propyl trimethoxysilane is added, and the mixture is reacted at 45℃ for 7h, and then distilled under reduced pressure to obtain a modified pyrimidine;

[0099] Step (2): 8 parts of silicon carbide, 144 parts of anhydrous ethanol, 32 parts of deionized water and 24 parts of modified pyrimidine were uniformly mixed and reacted at 55℃ for 5h, and after filtration, washing and drying, aminosilicon carbide was obtained;

[0100] Compared with Example 2, in Step (1) of Comparative Example 3, the mass ratio of 2,4,6-triaminopyrimidine and 3-(2,3-epoxypropoxy) propyl trimethoxysilane was 1:6, and the other steps were the same as Example 2.

[0101] Experiment: The high-wear-resistance piston rod obtained in Examples 1-3 and Comparative Examples 1-3 was taken to prepare a sample, and the performance of the sample was detected and the detection results were recorded:

[0102] Microhardness test: HXD-1000TMC metallographic microhardness tester was used, the sample was placed on the microhardness tester, the hardness tester load pressure P was set to 20N, and the pressure was kept for 15s to make an indentation, the Vickers hardness of the composite coating was calculated, 10 points were taken on the cross section of the sample coating, and the final result of the coating hardness was taken as the arithmetic mean.

[0103] Wear resistance test: a sliding friction wear tester (Rtec MFT-3000) was used to measure the friction coefficient of the sample, the wear of the sample in the actual work was simulated, the test parameters were set as follows: normal load 50N, displacement amplitude 4.5mm, wear time 1800s, temperature room temperature, and the counter part was GCr15 steel ball, after the test, the wear scar morphology of the coating was observed, and the wear volume was measured by white light interferometer (Usp-Sigma).

[0104] The test results are as follows:

[0105] Microhardness / HV Wear volume / mm 3 ]] Friction coefficient Example 1 924 4.3 0.18 Example 2 932 4.0 0.16 Example 3 928 4.2 0.20 Comparative Example 1 889 5.2 0.32 Comparative Example 2 906 4.8 0.28 Comparative Example 3 915 4.6 0.25

[0106] According to the data in the above table, the following conclusions can be clearly obtained:

[0107] 1. Compared with Examples 1-3, the microhardness of the products obtained in Comparative Examples 1 and 2 decreases, and the wear volume and friction coefficient increase, which shows that the composite prepared by adding aminomolybdenum disulfide in the present application has better lubricating performance, thereby effectively improving the wear resistance of the material; compared with unmodified silicon carbide, the aminosilicon carbide prepared in the present application has better reactivity and introduces a rigid pyrimidine structure, thereby improving the wear resistance of the coating.

[0108] 2、Compared with examples 1-3, the microhardness of the product obtained in Comparative Example 3 decreases, and the wear volume and friction coefficient increase, which indicates that when excess 3-(2,3-epoxypropoxy) propyl trimethoxysilane is added, it will cause complete reaction of the amino group, thereby affecting the subsequent reaction, therefore, the performance of the aminoated silicon carbide prepared in the application is affected by the ratio of the reagents in the preparation process, and by selecting the mass ratio within the range, the aminoated silicon carbide with excellent wear resistance can be obtained.

[0109] It will be obvious to a person skilled in the art that, without departing from the spirit or essential characteristics of the application, the present application can be implemented in other specific forms. The present examples are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the description given above, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A method of making a high-wear-resistance piston rod based on a gas spring, characterized in that: It comprises the following steps: Step S1: the piston rod is degreased, cleaned and dried to obtain a pretreated piston rod; Step S2: the cladding powder is cladded on the surface of the pretreated piston rod by laser cladding process to form a cladding layer; Step S3: the epoxy resin and dimethylbenzene are mixed uniformly, the composite, curing agent, leveling agent and defoaming agent are added and mixed uniformly to obtain wear-resistant paint; Step S4: the wear-resistant paint is coated on the surface of the cladding layer, and after drying and curing, a wear-resistant coating is formed to obtain a high wear-resistant piston rod; The preparation method of the composite is as follows: The tannic acid and deionized water are mixed uniformly, and the 4-formylphenylboronic acid is added and mixed uniformly, and the reaction is carried out for 2-4h, and then the borate ester compound is obtained by filtration; The amino molybdenum disulfide, amino silicon carbide and deionized water are mixed uniformly, and the borate ester compound and acetic acid are added and reacted at 75-85℃ for 4-6h, and then the composite is obtained by filtration, washing and drying. The composite is composed of the following components in parts by weight: amino silicon carbide 5-10 parts, amino molybdenum disulfide 10-15 parts, borate ester compound 15-25 parts, acetic acid 4-8 parts and deionized water 50-70 parts.

2. A method of making a high wear resistant piston rod based on gas springs according to claim 1, characterized in that: In step S2, the cladding powder is iron-based alloy powder.

3. A method of making a high wear resistant piston rod based on gas spring as claimed in claim 1, wherein: In step S2, the laser cladding process conditions are as follows: laser power 3500-4500W, cladding speed 10-100m / min, spot diameter 2-5mm and overlap rate 40-50%.

4. A method of making a high wear resistant piston rod based on gas spring as claimed in claim 1, wherein: The wear-resistant paint is composed of the following components in parts by weight: epoxy resin 50-60 parts, dimethylbenzene 25-50 parts, composite 15-25 parts, curing agent 5-10 parts, leveling agent 0.1-0.3 parts and defoaming agent 0.1-0.2 parts.

5. A method of making a high wear resistant piston rod based on gas spring as claimed in claim 1, wherein: The mass ratio of the tannic acid, deionized water and 4-formylphenylboronic acid is 1:(15-20):(0.5-1.0).

6. A method of making a high wear resistant gas spring based piston rod as claimed in claim 1, wherein: The preparation method of the amino silicon carbide is as follows: Step (1): the 2,4,6-triaminopyrimidine and dimethyl sulfoxide are mixed uniformly, and the 3-(2,3-epoxypropoxy)propyl trimethoxysilane is added and reacted at 40-50℃ for 6-8h, and then the modified pyrimidine is obtained by reduced pressure distillation; Step (2): the silicon carbide, anhydrous ethanol, deionized water and modified pyrimidine are mixed uniformly and reacted at 50-60℃ for 4-6h, and then the amino silicon carbide is obtained by filtration, washing and drying.

7. A method of making a high wear resistant piston rod based on gas spring as claimed in claim 1, wherein: The preparation method of the amino molybdenum disulfide is as follows: Step A: the molybdenum disulfide is kept at 340-360℃ for 2-6h under air condition to obtain oxygen etched molybdenum disulfide; Step B: the oxygen etched molybdenum disulfide, sodium hydroxide and deionized water are mixed uniformly, and then the pretreated molybdenum disulfide is obtained by hydrothermal reaction and centrifugal separation, and then washed and dried; Step C: the pretreated molybdenum disulfide and deionized water are mixed uniformly, and then the L-cysteine is added and ultrasonic treated for 3-5h, and then the amino molybdenum disulfide is obtained by continuing stirring for 22-24h, and then filtering, washing and drying.

8. A high wear-resistant piston rod based on gas spring prepared by the preparation method of any one of claims 1-7.