CN115261848A - Preparation method of high-strength wear-resistant agricultural implement coating - Google Patents
Preparation method of high-strength wear-resistant agricultural implement coating Download PDFInfo
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- CN115261848A CN115261848A CN202210879829.8A CN202210879829A CN115261848A CN 115261848 A CN115261848 A CN 115261848A CN 202210879829 A CN202210879829 A CN 202210879829A CN 115261848 A CN115261848 A CN 115261848A
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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
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
- C08G83/008—Supramolecular polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
Abstract
A preparation method of a high-strength wear-resistant agricultural implement coating relates to a preparation method of an agricultural implement coating. The invention aims to solve the problem that most of the existing agricultural implements are poor in hardness and wear resistance. The method comprises the following steps: 1. preparing a metal organic framework; 2. preparing cladding powder; 3. pretreating farm tools; 4. laser cladding is carried out, and a high-strength wear-resistant farm tool coating is formed on the surface of the farm tool. The invention uses metal organic frame, graphene and ZrO2The powder, the boron nitride and the copper powder are mixed to prepare cladding powder, and then a modified ceramic reinforced cladding layer is prepared on the surface of the agricultural implement by utilizing a laser cladding technology, so that the hardness and the wear resistance of the agricultural implement are improved; the coating prepared by the invention can prolong the service life of the farm tool; the inventionThe prepared coating can be used for all the existing agricultural tools and has wide application range. The invention can obtain a high-strength wear-resistant agricultural implement coating.
Description
Technical Field
The invention relates to a preparation method of an agricultural implement coating.
Background
Agricultural implement refers to the tool that agricultural production used, also called agricultural implement, agricultural production instrument. Agricultural implements are implements used by farmers to alter objects of work during their agricultural operations.
The field soil-touching parts mainly comprise ploughshares, harrow pieces, disc cutters, rotary tillage cutters, hoes and the like, are core parts in the farming operation process of agricultural machinery, and the working reliability of the soil-touching wear-resistant parts becomes one of key factors for improving the operation quality of large and medium field farming and soil-preparing machinery in China and reducing the difference between the field farming and the imported machines and tools.
Wear is a major failure mode of agricultural tillage components, causing significant economic losses. The materials and their parts cause a great consumption of energy and raw materials due to wear and friction.
China is a big agricultural country, and the consumption of agricultural machinery cultivation parts such as disc rakes, ploughshares, subsoiling shovel tips, rotary tillage blades and the like is extremely large. The agricultural machinery tillage parts are directly contacted with soil, which is typical abrasive wear, and the soil environment influences the working performance and the service life of the tillage parts. The soil environment requires hardness and wear resistance of the tillage components. Currently, most agricultural implements are not high in performance.
Disclosure of Invention
The invention aims to solve the problem that most of existing agricultural implements are poor in hardness and wear resistance, and provides a preparation method of a high-strength wear-resistant agricultural implement coating.
A preparation method of a high-strength wear-resistant agricultural implement coating is specifically completed according to the following steps:
1. preparing a metal organic framework:
uniformly mixing a 5,10,15, 20-tetra (4-hydroxyphenyl) porphyrin solution and a cobalt nitrate/N, N-dimethylformamide solution to obtain a mixed solution; reacting the mixed solution at the temperature of 100 ℃ for 1-2 h, and finally removing the N, N-dimethylformamide to obtain a metal organic framework;
2. preparing cladding powder:
mixing metal organic frame, graphene and ZrO2Mixing the powder, boron nitride and copper powder, and performing ball milling to obtain cladding powder;
3. pretreating farm tools:
polishing the farm tool by using sand paper until the surface is bright, cleaning by using absolute ethyl alcohol, and drying to obtain a pretreated farm tool;
4. laser cladding:
(1) heating the pretreated farm tool to 450-550 ℃, and then heating for 1-2 h at 450-550 ℃;
(2) and cladding the cladding powder on the surface of the pretreated farm tool by adopting a laser cladding device to form a high-strength wear-resistant farm tool coating on the surface of the farm tool.
Compared with the prior art, the invention has the following advantages:
1. the metal organic framework is prepared by using 5,10,15, 20-tetra (4-hydroxyphenyl) porphyrin and cobalt nitrate, the 5,10,15, 20-tetra (4-hydroxyphenyl) porphyrin is a macromolecular heterocyclic compound, and the metal organic framework generated by the reaction of the metal organic framework and the cobalt nitrate has high specific surface area and hardness, so that the mechanical property of the coating is improved;
2. the invention uses metal organic frame, graphene and ZrO2The powder, the boron nitride and the copper powder are mixed to prepare cladding powder, and then a modified ceramic reinforced cladding layer is prepared on the surface of the agricultural implement by utilizing a laser cladding technology, so that the hardness and the wear resistance of the agricultural implement are improved;
3. the coating prepared by the invention can prolong the service life of the farm tool;
4. the coating prepared by the invention can be used for all the existing agricultural tools and has wide application range.
The invention can obtain a high-strength wear-resistant agricultural implement coating.
Detailed Description
The following examples further illustrate the present invention but are not to be construed as limiting the invention. Modifications and substitutions to methods, procedures, or conditions of the invention may be made without departing from the spirit of the invention.
The first specific implementation way is as follows: the embodiment provides a preparation method of a high-strength wear-resistant agricultural implement coating, which is specifically completed according to the following steps:
1. preparing a metal organic framework:
uniformly mixing a 5,10,15, 20-tetra (4-hydroxyphenyl) porphyrin solution and a cobalt nitrate/N, N-dimethylformamide solution to obtain a mixed solution; reacting the mixed solution at the temperature of 100 ℃ for 1-2 h, and finally removing the N, N-dimethylformamide to obtain a metal organic framework;
2. preparing cladding powder:
mixing metal organic frame, graphene and ZrO2Mixing the powder, boron nitride and copper powder, and performing ball milling to obtain cladding powder;
3. pretreating farm tools:
polishing the farm tool by using sand paper until the surface is bright, cleaning by using absolute ethyl alcohol, and drying to obtain a pretreated farm tool;
4. laser cladding:
(1) heating the pretreated farm implement to 450-550 ℃, and then heating for 1-2 h at 450-550 ℃;
(2) and cladding the cladding powder on the surface of the pretreated farm tool by adopting a laser cladding device to form a high-strength wear-resistant farm tool coating on the surface of the farm tool.
The second embodiment is as follows: the present embodiment differs from the present embodiment in that: the preparation method of the 5,10,15, 20-tetra (4-hydroxyphenyl) porphyrin solution comprises the following steps: 5,10,15,20-tetrakis (4-hydroxyphenyl) porphyrin was dispersed in N, N-dimethylformamide to give a solution of 5,10,15,20-tetrakis (4-hydroxyphenyl) porphyrin. Other steps are the same as in the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the concentration of the 5,10,15, 20-tetra (4-hydroxyphenyl) porphyrin solution is 0.01 mg/mL-0.03 mg/mL. The other steps are the same as those in the first or second embodiment.
The fourth concrete implementation mode is as follows: the difference between this embodiment and one of the first to third embodiments is: the concentration of the cobalt nitrate/N, N-dimethylformamide solution in the step one is 0.01 mg/mL-0.03 mg/mL. The other steps are the same as those in the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the molar ratio of 5,10,15, 20-tetra (4-hydroxyphenyl) porphyrin to cobalt nitrate in the mixed solution in the first step is 1; the ball milling time in the step two is 2-3 h, and the ball milling speed is 200-500 r/min. The other steps are the same as those in the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: in the second step, the mass fraction of the metal-organic framework in the cladding powder is 2-3%, the mass fraction of the graphene is 0.6-1.2%, and ZrO is in a proportion2The powder accounts for 5-10% by mass, the boron nitride accounts for 5-12% by mass, and the balance is copper powder. The other steps are the same as those in the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and the first to sixth embodiments is: the laser cladding device in the fourth step (2) comprises a fiber laser, a movable device and a powder feeder. The other steps are the same as those in the first to sixth embodiments.
The specific implementation mode is eight: the difference between this embodiment and one of the first to seventh embodiments is: the power of the optical fiber laser is 1500W-2200W, the scanning speed is 100 mm/min-120 mm/min, and the lapping rate is 30% -50%. The other steps are the same as those in the first to seventh embodiments.
The specific implementation method nine: the difference between this embodiment and the first to eighth embodiments is: the movable device is used for fixing the pretreated farm tool, and the moving speed is 2-4 mm/s; the powder feeding amount of the powder feeder is 2 g/min-3 g/min, and the powder carrying gas is argon. The other steps are the same as those in the first to eighth embodiments.
The detailed implementation mode is ten: the difference between this embodiment and one of the first to ninth embodiments is as follows: the thickness of the high-strength wear-resistant agricultural implement coating in the step four (2) is 2 mm-2.5 mm. The other steps are the same as those in the first to ninth embodiments.
The following examples were used to demonstrate the beneficial effects of the present invention:
example 1: a preparation method of a high-strength wear-resistant agricultural implement coating is specifically completed according to the following steps:
1. preparing a metal organic framework:
(1) the preparation method of the 5,10,15,20-tetra (4-hydroxyphenyl) porphyrin solution comprises the following steps: dispersing 5,10,15, 20-tetra (4-hydroxyphenyl) porphyrin into N, N-dimethylformamide to obtain a solution of 5,10,15, 20-tetra (4-hydroxyphenyl) porphyrin;
the concentration of the 5,10,15, 20-tetra (4-hydroxyphenyl) porphyrin solution in the step one (1) is 0.03mg/mL;
(2) uniformly mixing the 5,10,15, 20-tetra (4-hydroxyphenyl) porphyrin solution and the cobalt nitrate/N, N-dimethylformamide solution to obtain a mixed solution; reacting the mixed solution at the temperature of 100 ℃ for 2h, and finally removing the N, N-dimethylformamide to obtain a metal organic framework;
the concentration of the cobalt nitrate/N, N-dimethylformamide solution in the step one (2) is 0.03mg/mL;
the molar ratio of 5,10,15, 20-tetra (4-hydroxyphenyl) porphyrin to cobalt nitrate in the mixed solution in the first step (2) is 1;
2. preparing cladding powder:
mixing metal organic frame, graphene and ZrO2Mixing the powder, boron nitride and copper powder, and performing ball milling to obtain cladding powder;
the ball milling time in the step two is 2 hours, and the ball milling speed is 500r/min;
in the second step, the mass fraction of the metal-organic framework in the cladding powder is 3%, the mass fraction of the graphene is 1%, and ZrO is selected2The mass fraction of the powder is 8%, the mass fraction of the boron nitride is 10%, and the balance is copper powder;
3. pretreating farm tools:
polishing the farm tool by using sand paper until the surface is bright, cleaning by using absolute ethyl alcohol, and drying to obtain a pretreated farm tool;
4. laser cladding:
(1) heating the pretreated farm tool to 500 ℃, and then heating for 1.5 hours at 500 ℃;
(2) cladding powder on the surface of the pretreated farm tool by adopting a laser cladding device to form a high-strength wear-resistant farm tool coating on the surface of the farm tool;
the laser cladding device in the step four (2) comprises a fiber laser, a movable device and a powder feeder;
the power of the optical fiber laser is 1800W, the scanning speed is 120mm/min, and the lap joint rate is 50%; the movable device is used for fixing the pretreated farm tool, and the moving speed is 3mm/s; the powder feeding amount of the powder feeder is 2.5g/min, and the powder carrying gas is argon;
the thickness of the high-strength wear-resistant agricultural implement coating in the step four (2) is 2.5mm.
Comparative example 1: the preparation method of the agricultural implement coating is specifically completed according to the following steps:
1. preparing cladding powder:
mixing graphene and ZrO2Mixing the powder, boron nitride and copper powder, and performing ball milling to obtain cladding powder;
the ball milling time in the step one is 2 hours, and the ball milling speed is 500r/min;
the mass fraction of graphene in the cladding powder in the step one is 1%, and ZrO is2The mass fraction of the powder is 8%, the mass fraction of the boron nitride is 10%, and the balance is copper powder;
2. pretreating farm tools:
polishing the farm tool by using sand paper until the surface is bright, cleaning by using absolute ethyl alcohol, and drying to obtain a pretreated farm tool;
3. laser cladding:
(1) heating the pretreated farm tool to 500 ℃, and then heating for 1.5 hours at 500 ℃;
(2) cladding powder on the surface of the pretreated farm tool by adopting a laser cladding device, and forming a farm tool coating on the surface of the farm tool;
the laser cladding device in the third step (2) comprises a fiber laser, a movable device and a powder feeder; the power of the optical fiber laser is 1800W, the scanning speed is 120mm/min, and the lap joint rate is 50%; the movable device is used for fixing the pretreated farm tool, and the moving speed is 3mm/s; the powder feeding amount of the powder feeder is 2.5g/min, and the powder carrying gas is argon;
and the thickness of the high-strength wear-resistant agricultural implement coating in the step three (2) is 2.5mm.
Mechanical property tests are carried out on the farm tool with the high-strength wear-resistant farm tool coating on the surface prepared in the example 1, the farm tool with the farm tool coating on the surface prepared in the comparative example 1 and the pre-treated farm tool; the test results are listed in table 1;
TABLE 1
| hardness/GPa | Coefficient of friction | |
| Example 1 | 48.28 | 0.09 |
| Comparative example 1 | 39.36 | 0.22 |
| Pretreated farm tool | 23.73 | 0.68 |
From table 1, it can be seen that: metal organic framework, graphene and ZrO2The powder, the boron nitride and the copper powder have synergistic effect, so that the hardness and the wear resistance of the agricultural implement are improved, and the service life of the agricultural implement is prolonged.
Claims (10)
1. A preparation method of a high-strength wear-resistant agricultural implement coating is characterized by comprising the following steps:
1. preparing a metal organic framework:
uniformly mixing a 5,10,15, 20-tetra (4-hydroxyphenyl) porphyrin solution and a cobalt nitrate/N, N-dimethylformamide solution to obtain a mixed solution; reacting the mixed solution at the temperature of 100 ℃ for 1-2 h, and finally removing the N, N-dimethylformamide to obtain a metal organic framework;
2. preparing cladding powder:
mixing metal organic frame, graphene and ZrO2Mixing the powder, boron nitride and copper powder, and performing ball milling to obtain cladding powder;
3. pretreating farm tools:
polishing the farm tool by using sand paper until the surface is bright, cleaning by using absolute ethyl alcohol, and drying to obtain a pretreated farm tool;
4. laser cladding:
(1) heating the pretreated farm tool to 450-550 ℃, and then heating for 1-2 h at 450-550 ℃;
(2) and cladding the cladding powder on the surface of the pretreated farm tool by adopting a laser cladding device to form a high-strength wear-resistant farm tool coating on the surface of the farm tool.
2. The method for preparing a high-strength wear-resistant agricultural implement coating according to claim 1, wherein the 5,10,15,20-tetra (4-hydroxyphenyl) porphyrin solution is prepared by the following steps: 5,10,15,20-tetrakis (4-hydroxyphenyl) porphyrin was dispersed in N, N-dimethylformamide to give a solution of 5,10,15,20-tetrakis (4-hydroxyphenyl) porphyrin.
3. The method for preparing a high-strength wear-resistant agricultural implement coating according to claim 1 or 2, wherein the concentration of the 5,10,15, 20-tetra (4-hydroxyphenyl) porphyrin solution is 0.01mg/mL to 0.03mg/mL.
4. The method for preparing a high-strength wear-resistant agricultural implement coating according to claim 1, wherein the concentration of the cobalt nitrate/N, N-dimethylformamide solution in the step one is 0.01 mg/mL-0.03 mg/mL.
5. The method for preparing a high-strength wear-resistant agricultural implement coating according to claim 1, wherein the molar ratio of 5,10,15, 20-tetra (4-hydroxyphenyl) porphyrin to cobalt nitrate in the mixed solution in the first step is 1; the ball milling time in the step two is 2 h-3 h, and the ball milling speed is 200 r/min-500 r/min.
6. The method for preparing a high-strength wear-resistant agricultural implement coating according to claim 1, wherein in the cladding powder in the second step, the mass fraction of the metal-organic framework is 2-3%, the mass fraction of the graphene is 0.6-1.2%, and the mass fraction of the ZrO is ZrO 2%2The weight percentage of the powder is 5-10%, the weight percentage of the boron nitride is 5-12%, and the rest is copper powder.
7. The method for preparing a high-strength wear-resistant agricultural implement coating according to claim 1, wherein the laser cladding device in the fourth step (2) comprises a fiber laser, a movable device and a powder feeder.
8. The method for preparing the high-strength wear-resistant agricultural implement coating according to claim 1, wherein the power of the fiber laser is 1500W-2200W, the scanning speed is 100 mm/min-120 mm/min, and the lap joint rate is 30% -50%.
9. The method for preparing the high-strength wear-resistant agricultural implement coating according to claim 1, wherein the movable device is used for fixing the pretreated agricultural implement, and the moving speed is 2-4 mm/s; the powder feeding amount of the powder feeder is 2 g/min-3 g/min, and the powder carrying gas is argon.
10. The method for preparing the high-strength wear-resistant agricultural implement coating according to claim 1, wherein the thickness of the high-strength wear-resistant agricultural implement coating in the fourth step (2) is 2mm to 2.5mm.
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