CN114774915A - Preparation method of wear-resistant alloy coating for rotary drum filter scraper - Google Patents
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Abstract
A preparation method of a wear-resistant alloy coating for a rotary drum filter scraper belongs to the field of metal surface treatment and comprises nano Al2O3The surface treatment, the preparation of mixed powder, the preparation of coating liquid, the spraying and curing and the vacuum cladding; the method disclosed by the invention is used for preparing the iron-based alloy coating with high hardness, high wear resistance and good corrosion resistance; the wear-resistant alloy coating obtained by the method has Vickers hardness of 1087-1135 HV and volume abrasion loss of 1.26-1.51 multiplied by 10‑4mm3The binding force of the coating is 345-359 MPa, and the corrosion rate in the sulfuric acid solution is 5.92-7.08 multiplied by 10‑5g/m2H, corrosion rate in sodium hydroxide solution of 1.48 to 2.59X 10‑5g/m2·h。
Description
Technical Field
The invention relates to a preparation method of a wear-resistant alloy coating for a rotary drum filter scraper, belonging to the field of metal surface treatment.
Background
The rotary drum filter has the advantages of strong designability of structure, high automation degree, continuous operation, inorganic speed regulation and convenient maintenance, is a filter device with good performance and reliable use, and is widely applied to various fields of food, medicine, chemical industry, water treatment, coal refining and the like. The scraper is used as a core component in the rotary drum filter, the operation working condition is relatively severe, and the requirements on the hardness, wear resistance and corrosion resistance of the surface of the material are extremely high, so how to improve the hardness, wear resistance and corrosion resistance of the surface of the scraper becomes a key focus of scraper manufacturers.
The alloy coating process for cladding the surface of the equipment part has the remarkable advantages of excellent performance, high bonding strength with a matrix, high material utilization rate and the like, the existing research provides a plurality of preparation methods of cladding alloy coatings, most of the preparation methods are focused on two methods of laser cladding and induction cladding, and the two methods have the advantages of fast heating, fast cooling, small thermal deformation of the matrix and the like, but the preparation method has the defects of high dilution rate, uneven heat distribution, difficulty in realizing uniform coating, poor balance of various performances of the surface of a workpiece, expected service life of the workpiece and great influence on the stability of equipment. The vacuum cladding method has the characteristics of simple process, high coating surface quality, controllable coating thickness, realization of metallurgical bonding between the coating and the matrix, high bonding strength and the like, so that researchers pay more and more attention to the vacuum cladding method, and achievements reported in the aspects of literature and patents are increasing.
Chinese patent CN107630215A discloses a wear-resistant and corrosion-resistant treatment method for the surface of a workpiece, which comprises the steps of 1, preparing a vacuum cladding pre-coating material, wherein the vacuum cladding pre-coating material is a mixture of nickel-based self-fluxing alloy powder and bonding colloid; step 2, coating the pre-coating material, and solidifying the pre-coating material on the surface of the workpiece to form a pre-coating layer; and 3, vacuum cladding, and forming a compact non-oxidation wear-resistant corrosion-resistant alloy coating on the surface of the workpiece. The wear-resistant and corrosion-resistant alloy coating obtained by the patent has higher hardness, but poorer wear resistance and corrosion resistance.
Chinese patent CN106435581A discloses a process for treating the super-hardened surface of a steel part, in particular to a process for cladding a WC composite coating on an iron-based alloy by using a vacuum cladding method, the method firstly prepares a composite coating paint, and leads the composite coating paint to form a powder raw material with good dispersion degree, uniform particle size, high strength and strong wear resistance in advance; and then, cladding the obtained spherical raw material on the surface of the steel piece by using a vacuum cladding method to obtain the steel piece with high surface hardness. The coating obtained in the patent has high hardness, but still does not solve the problem of poor wear resistance and corrosion resistance of the coating.
As can be seen from the above, the alloy coating prepared by vacuum cladding at present still has the problems of poor wear resistance, poor corrosion resistance and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a preparation method of a wear-resistant alloy coating for a rotary drum filter scraper, which realizes the following purposes: the alloy coating with high hardness, high wear resistance and good corrosion resistance is prepared.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
a process for preparing the antiwear alloy coating of drum filter scraper includes such steps as preparing nano Al2O3The method comprises five steps of surface treatment, preparation of mixed powder, preparation of coating liquid, spraying and curing and vacuum cladding.
The following is a further improvement of the above technical scheme:
Dissolving isopropyl distearoyl acyloxy aluminate in ethyl acetate at 4500-6000 rpm, and slowly adding nano Al2O3After the material feeding is finished, the stirring is continued to ensure that the nano Al is mixed2O3After uniform dispersion, reducing the stirring speed to 1000-1600 rpm, controlling the temperature to 80-95 ℃ for reflux reaction for 2-5 hours, performing centrifugal separation, washing the obtained solid with absolute ethyl alcohol for 2-4 times, and then performing vacuum drying at 50-70 ℃ for 1-2 hours to obtain the surface-treated nano Al2O3；
The nano Al2O3The particle size of the nano-particles is 15-45 nm;
the isopropyl distearoyl acyloxy aluminate, the ethyl acetate and the nano Al2O3The mass ratio of (A) is 1-2.5: 90-140: 15-25.
Nano Al after surface treatment2O3Mixing 3-aminopropyltrimethoxysilane, diethylaminomethyl triethoxysilane, iron-based alloy powder and deionized water to form slurry, then ball-milling the slurry until the average particle size of the powder in the slurry is 2-8 microns, discharging, and drying the obtained milled slurry at 70-90 ℃ for 3-5 hours to obtain mixed powder;
the particle size of the iron-based alloy powder is 100-300 meshes, and the iron-based alloy powder comprises 4.3wt% of carbon, 2.1wt% of boron, 2.4wt% of silicon, 26wt% of chromium, 4.7wt% of nickel, 2.6wt% of tungsten and the balance less than 100wt% of iron;
the surface-treated nano Al2O3The mass ratio of the 3-aminopropyltrimethoxysilane to the diethylaminomethyl triethoxysilane to the iron-based alloy powder to the deionized water is 0.8-1.3: 0.5-1: 0.4-1: 20-40: 80-120.
Mixing cyclopentyl methyl ether, organic polysilazane and gamma-isocyanatopropyl triethoxysilane, adding dimethyl silicone oil at a stirring speed of 3500-5000 r/min, slowly adding hydrophilic fumed silica powder, stirring and dispersing uniformly, then slowly adding the mixture powder, and continuously stirring for 1-2 hours after the material addition is finished to obtain a coating solution;
the molecular weight of the organic polysilazane is 710-910 g/mol, and the viscosity is 11-33 cP;
the particle size of the hydrophilic fumed silica powder is 10-50 nanometers;
the mass ratio of the cyclopentyl methyl ether, the organic polysilazane, the gamma-isocyanatopropyl triethoxysilane, the dimethyl silicone oil, the hydrophilic fumed silica powder to the mixed material powder is 70-100: 9-19: 0.3-0.6: 0.1-0.4: 0.5-1: 50-80.
Step 4, spraying and curing
After degreasing, cleaning and drying the surface of the rotary drum filter scraper, spraying a coating liquid, controlling the thickness of a wet film to be 30-50 microns, drying for 0.8-1.5 hours at normal temperature, heating to 130-180 ℃ under the protection of nitrogen, curing for 1-2.5 hours, and cooling to room temperature to obtain the rotary drum filter scraper with a cured coating;
the material of the rotary drum filter scraper is alloy steel.
Step 5, vacuum cladding
Placing the rotary drum filter scraper with the cured coating in a vacuum cladding furnace, controlling the vacuum degree to be 50-80 Pa, heating to 200-260 ℃ at the speed of 2-5 ℃/min, keeping the temperature for 30-60 minutes, then heating to 950-1180 ℃ at the speed of 1-4 ℃/min, keeping the temperature for 20-40 minutes, and then cooling to room temperature to form the wear-resistant alloy coating on the surface of the rotary drum filter scraper.
Compared with the prior art, the invention has the following beneficial effects:
1. the method disclosed by the invention is used for preparing the iron-based alloy coating with high hardness, high wear resistance and good corrosion resistance;
2. the wear-resistant alloy coating obtained by the method has Vickers hardness of 1087-1135 HV and volume abrasion loss of 1.26-1.51 multiplied by 10-4mm3The binding force of the coating is 345-359 MPa, and the corrosion rate in the sulfuric acid solution is 5.92-7.08 multiplied by 10-5g/m2H, the corrosion rate in the sodium hydroxide solution is 1.48-2.59 multiplied by 10-5g/m2•h；
3. The invention is to nano Al2O3Surface treatment is carried out to lead the nano Al2O3The coating is better and uniformly dispersed in the coating liquid, so that the compactness of the alloy coating is greatly improved, and the wear resistance and corrosion resistance of the alloy coating are finally improved;
4. in the preparation process of the mixed powder, two coupling agents, namely 3-aminopropyl trimethoxy silane and diethylamino methyl triethoxy silane, are added, so that the hydrophobicity of the surface of the iron-based alloy powder is increased, the dispersion uniformity of the iron-based alloy powder in a cyclopentyl methyl ether solvent is ensured, and the performance of the finally obtained coating is more uniform and stable;
5. according to the invention, organic polysilazane is used as a curing adhesive, and gamma-isocyanatopropyl triethoxysilane is added to further increase the adhesion of the coating liquid to the base metal, and a compact high-hardness wear-resistant ceramic structure can be formed after vacuum cladding of the organic polysilazane, so that the hardness, wear resistance and corrosion resistance of the alloy coating are fundamentally improved.
Drawings
FIG. 1 is an SEM image of the surface of the wear-resistant alloy coating obtained in examples 1, 2 and 3;
wherein 1 is an SEM image of the surface of the wear-resistant alloy coating obtained in example 1;
2 is an SEM image of the surface of the wear-resistant alloy coating obtained in the example 2;
3 is SEM image of the surface of the wear-resistant alloy coating obtained in the example 3;
FIG. 2 is an XRD pattern of the wear resistant alloy coatings obtained in examples 1, 2 and 3;
wherein 1 is the XRD curve of the wear-resistant alloy coating obtained in example 1;
2 is the XRD curve of the wear-resistant alloy coating obtained in the example 2;
and 3 is an XRD curve of the wear-resistant alloy coating obtained in the example 3.
Detailed Description
The preferred embodiments of the present invention are described below, and it should be understood that the preferred embodiments described herein are only for illustrating and explaining the present invention and are not to be construed as limiting the present invention.
Example 1: preparation method of wear-resistant alloy coating for rotary drum filter scraper
The method comprises the following steps:
1. nano Al2O3Surface treatment of
Dissolving isopropyl distearoyl acyloxy aluminate in ethyl acetate, slowly adding nano Al at 5500 rpm2O3After the material feeding is finished, the stirring is continued to ensure that the nano Al is mixed2O3After the dispersion is uniform, the stirring speed is reduced to 1300 r/min, the reflux reaction is carried out for 4 hours at the temperature of 90 ℃, the centrifugal separation is carried out, the obtained solid is washed for 3 times by absolute ethyl alcohol and then is dried for 1.5 hours in vacuum at the temperature of 60 ℃, and the nano Al after the surface treatment is obtained2O3；
The nano Al2O3Has a particle diameter of 30 nm;
the isopropyl distearoyl acyloxy aluminate, the ethyl acetate and the nano Al2O3In a mass ratio of 2:120: 20.
2. Preparation of the Mixed powder
Nano Al after surface treatment2O3Mixing 3-aminopropyltrimethoxysilane, diethylaminomethyl triethoxysilane, iron-based alloy powder and deionized water to form slurry, ball-milling the slurry until the average particle size of the powder in the slurry is 6 microns, discharging, and drying the obtained ground slurry at 80 ℃ for 4 hours to obtain mixed powder;
the grain diameter of the iron-based alloy powder is 200 meshes, and the iron-based alloy powder comprises 4.3wt% of carbon, 2.1wt% of boron, 2.4wt% of silicon, 26wt% of chromium, 4.7wt% of nickel, 2.6wt% of tungsten and the balance less than 100wt% of iron;
after said surface treatmentNano Al2O3The mass ratio of the 3-aminopropyltrimethoxysilane to the diethylamino methyl triethoxysilane to the iron-based alloy powder to the deionized water is 1:0.8:0.7:30: 100.
3. Preparation of coating liquid
Mixing cyclopentyl methyl ether, organic polysilazane and gamma-isocyanatopropyl triethoxysilane, adding dimethyl silicone oil at the stirring speed of 4000 rpm, slowly adding hydrophilic fumed silica powder, stirring and dispersing uniformly, then slowly adding the mixture powder, and continuously stirring for 1.5 hours after the material addition is finished to obtain a coating solution;
the molecular weight of the organic polysilazane is 850g/mol, and the viscosity of the organic polysilazane is 20 cP;
the particle size of the hydrophilic fumed silica powder is 35 nanometers;
the mass ratio of the cyclopentyl methyl ether to the organic polysilazane to the gamma-isocyanatopropyl triethoxysilane to the dimethyl silicone oil to the hydrophilic fumed silica powder to the mixed powder is 90:15:0.5:0.2:0.8: 60.
4. Spray curing
Removing oil stains on the surface of the rotary drum filter scraper, cleaning and drying, spraying a coating liquid, controlling the thickness of a wet film to be 40 micrometers, drying for 1.2 hours at normal temperature, heating to 160 ℃ under the protection of nitrogen, curing for 1.8 hours, and cooling to room temperature to obtain the rotary drum filter scraper with a cured coating;
the material of the rotary drum filter scraper is alloy steel.
Step 5, vacuum cladding
And (3) placing the rotary drum filter scraper with the cured coating in a vacuum cladding furnace, controlling the vacuum degree to be 70Pa, heating to 240 ℃ at the speed of 4 ℃/min, keeping the temperature for 45 minutes, then heating to 1100 ℃ at the speed of 3 ℃/min, keeping the temperature for 30 minutes, and then cooling to room temperature, so that the wear-resistant alloy coating is formed on the surface of the rotary drum filter scraper.
Example 2: preparation method of wear-resistant alloy coating for rotary drum filter scraper
The method comprises the following steps:
1. nano Al2O3Surface treatment of
Dissolving isopropyl distearoyl acyloxy aluminate in ethyl acetate, slowly adding nano Al at 4500 rpm2O3After the material feeding is finished, the stirring is continued to ensure that the nano Al is mixed2O3After the dispersion is uniform, the stirring speed is reduced to 1000 r/min, the reflux reaction is carried out for 2 hours at the temperature of 80 ℃, then the centrifugal separation is carried out, the obtained solid is washed for 2 times by absolute ethyl alcohol and then is dried for 1 hour in vacuum at the temperature of 50 ℃, and the nano Al after the surface treatment is obtained2O3；
The nano Al2O3Has a particle diameter of 15 nm;
the isopropyl distearoyl acyloxy aluminate, the ethyl acetate and the nano Al2O3The mass ratio of (A) to (B) is 1:90: 15.
2. Preparation of the Mixed powder
The nano Al after surface treatment2O3Mixing 3-aminopropyltrimethoxysilane, diethylaminomethyl triethoxysilane, iron-based alloy powder and deionized water to form slurry, then ball-milling the slurry until the average particle size of the powder in the slurry is 2 microns, discharging, and drying the obtained ground slurry at 70 ℃ for 3 hours to obtain mixed powder;
the particle size of the iron-based alloy powder is 100 meshes, and the iron-based alloy powder comprises 4.3wt% of carbon, 2.1wt% of boron, 2.4wt% of silicon, 26wt% of chromium, 4.7wt% of nickel, 2.6wt% of tungsten and the balance less than 100wt% of iron;
the surface-treated nano Al2O3The mass ratio of the 3-aminopropyltrimethoxysilane to the diethylaminomethyl triethoxysilane to the iron-based alloy powder to the deionized water is 0.8:0.5:0.4:20: 80.
3. Preparation of coating liquids
Mixing cyclopentyl methyl ether, organic polysilazane and gamma-isocyanatopropyl triethoxysilane, adding dimethyl silicone oil at a stirring speed of 3500 rpm, slowly adding hydrophilic fumed silica powder, stirring and dispersing uniformly, then slowly adding the mixture powder, and continuously stirring for 1 hour after the material addition to obtain a coating solution;
the molecular weight of the organic polysilazane is 710g/mol, and the viscosity is 11 cP;
the particle size of the hydrophilic fumed silica powder is 10 nanometers;
the mass ratio of the cyclopentyl methyl ether, the organic polysilazane, the gamma-isocyanatopropyl triethoxysilane, the dimethyl silicone oil, the hydrophilic fumed silica powder and the mixed powder is 70:9:0.3:0.1:0.5: 50.
4. Spray curing
Removing oil stains on the surface of a rotary drum filter scraper, cleaning and drying, spraying a coating liquid, controlling the thickness of a wet film to be 30 micrometers, drying at normal temperature for 0.8 hour, heating to 130 ℃ under the protection of nitrogen, curing for 1 hour, and cooling to room temperature to obtain the rotary drum filter scraper with a cured coating;
the material of the rotary drum filter scraper is alloy steel.
5. Vacuum cladding
Placing the rotary drum filter scraper with the cured coating in a vacuum cladding furnace, controlling the vacuum degree to be 50Pa, heating to 200 ℃ at the speed of 2 ℃/min, keeping the temperature for 30 minutes, then heating to 950 ℃ at the speed of 1 ℃/min, keeping the temperature for 20 minutes, and then cooling to room temperature, so that the wear-resistant alloy coating is formed on the surface of the rotary drum filter scraper.
Example 3: preparation method of wear-resistant alloy coating for rotary drum filter scraper
The method comprises the following steps:
1. nano Al2O3Surface treatment of
Dissolving isopropyl distearoyl acyloxy aluminate in ethyl acetate, at 6000 rpm, slowly adding nano Al2O3After the material feeding is finished, the stirring is continued to ensure that the nano Al is mixed2O3After the dispersion is uniform, the stirring speed is reduced to 1600 r/min, the reflux reaction is carried out for 5 hours at the temperature of 95 ℃, the centrifugal separation is carried out, the obtained solid is washed for 4 times by absolute ethyl alcohol, and then the vacuum drying is carried out for 2 hours at the temperature of 70 ℃, so as to obtain the nano Al after the surface treatment2O3；
The nano Al2O3Has a particle diameter of 45 nm;
the isopropyl distearoyl acyloxy aluminate, the ethyl acetate and the nano Al2O3In a mass ratio of 2.5:140: 25.
2. Preparation of the Mixed powder
Nano Al after surface treatment2O3Mixing 3-aminopropyltrimethoxysilane, diethylaminomethyl triethoxysilane, iron-based alloy powder and deionized water to form slurry, ball-milling the slurry until the average particle size of the powder in the slurry is 8 microns, discharging, and drying the obtained ground slurry at 90 ℃ for 5 hours to obtain mixed powder;
the particle size of the iron-based alloy powder is 300 meshes, and the iron-based alloy powder comprises 4.3wt% of carbon, 2.1wt% of boron, 2.4wt% of silicon, 26wt% of chromium, 4.7wt% of nickel, 2.6wt% of tungsten and the balance less than 100wt% of iron;
the surface-treated nano Al2O3The mass ratio of the 3-aminopropyltrimethoxysilane to the diethylamino methyl triethoxysilane to the iron-based alloy powder to the deionized water is 1.3:1:1:40: 120.
3. Preparation of coating liquids
Mixing cyclopentyl methyl ether, organic polysilazane and gamma-isocyanatopropyl triethoxysilane, adding dimethyl silicone oil at a stirring speed of 5000 r/min, slowly adding hydrophilic fumed silica powder, stirring and dispersing uniformly, then slowly adding the mixed powder, and continuously stirring for 2 hours after the addition is finished to obtain a coating liquid;
the molecular weight of the organic polysilazane is 910g/mol, and the viscosity is 33 cP;
the particle size of the hydrophilic fumed silica powder is 50 nanometers;
the mass ratio of the cyclopentyl methyl ether, the organic polysilazane, the gamma-isocyanatopropyl triethoxysilane, the dimethyl silicone oil, the hydrophilic fumed silica powder to the mixed powder is 100:19:0.6:0.4:1: 80.
4. Spray curing
Removing oil stains on the surface of the rotary drum filter scraper, cleaning and drying, spraying a coating liquid, controlling the thickness of a wet film to be 50 microns, drying at normal temperature for 1.5 hours, heating to 180 ℃ under the protection of nitrogen, curing for 2.5 hours, and cooling to room temperature to obtain the rotary drum filter scraper with a cured coating;
the material of the rotary drum filter scraper is alloy steel.
5. Vacuum cladding
And (3) placing the rotary drum filter scraper with the cured coating in a vacuum cladding furnace, controlling the vacuum degree to be 80Pa, heating to 260 ℃ at the speed of 5 ℃/min, keeping the temperature for 60 minutes, heating to 1180 ℃ at the speed of 4 ℃/min, keeping the temperature for 40 minutes, and then cooling to room temperature to form the wear-resistant alloy coating on the surface of the rotary drum filter scraper.
Comparative example 1: example 1 on the basis of nano Al2O3Without surface treatment
Comparative example 2: example 1 No 3-aminopropyltrimethoxysilane or diethylaminomethyltriethoxysilane was added
Comparative example 3: example 1 based on the absence of organopolysilazane
The steps 1 and 2 are the same as those in example 1;
steps 4 and 5 were performed as in example 1.
And (3) performance testing:
1. and (3) testing the hardness of the coating: the hardness of the coating is tested according to the Vickers hardness test method of GB/T7997-2014 hard alloy, and the test force is 294.2N (30 kgf);
2. and (3) testing the wear resistance of the coating: testing the wear resistance of the coating according to GB/T34501 and 2017 hard alloy wear resistance test method;
3. and (3) testing the binding force of the coating: the bonding strength of the sample coating is measured on an electronic universal tester controlled by an RGM-4050 microcomputer according to a dual sample stretching method in ASTM C633-2001 standard, and the stretching speed is set to be 1 mm/min;
4. and (3) corrosion resistance testing: a2.5 cm by 1.5cm sample was taken from the wiper blade obtained in examples 1, 2 and 3 and comparative examples 1, 2 and 3, the cross section thereof was sealed with a corrosion-resistant epoxy resin, and then immersed in an 8wt% aqueous solution of sulfuric acid for 100 hours and in a 15wt% aqueous solution of sodium hydroxide for 600 hours, respectively, and the corrosion rate was calculated by measuring the change in weight before and after immersion, and the calculation formula was VRate of corrosion=（MFront side-MRear end) /ST, wherein VRate of corrosionHas a unit of g/m2·h，MFront partMass of the sample before etching, MRear endFor the mass of the sample after etching, S is the immersion surface area of the sample in m2T is corrosion time in h;
the results of the above tests are given in the following table:
as can be seen from the data in the above table, nano Al in comparative example 1 is compared with examples 1, 2 and 32O3No surface treatment is carried out to result in nano Al2O3The alloy coating is difficult to uniformly disperse in the coating liquid, so that the compactness of the alloy coating is reduced, and finally the hardness, wear resistance, binding force and corrosion resistance of the alloy coating are greatly reduced; in the comparative example 2, two coupling agents, namely 3-aminopropyltrimethoxysilane and diethylaminomethyl triethoxysilane, are not added, so that the dispersion uniformity of the iron-based alloy powder in a cyclopentyl methyl ether solvent is influenced, and the performances of the coating are influenced finally; in the comparative example 3, no organic polysilazane is added, the hardness, wear resistance, bonding force and corrosion resistance of the alloy coating are reduced to the maximum extent, which shows that the hardness, wear resistance and corrosion resistance of the alloy coating can be fundamentally improved due to the compact high-hardness wear-resistant ceramic structure formed after vacuum cladding of the organic polysilazane.
From the SEM images of the surface of the wear-resistant alloy coating obtained in fig. 1 of the accompanying drawings, i.e. in examples 1, 2 and 3, the surface of the wear-resistant alloy coating obtained in the three examples can be seen, and the flatness is relatively good, and there are no particle protrusions and no microcracks, which indicates that the structure of the obtained wear-resistant alloy coating is dense, which is consistent with the macroscopic performances of high hardness, high wear resistance, good corrosion resistance, etc. of the coating; from the XRD patterns of the wear-resistant alloy coatings obtained in examples 1, 2 and 3, which are shown in fig. 2 of the drawings, it can be seen that the main composition of the coatings obtained in the three examples is an iron-based alloy.
Claims (2)
1. A preparation method of a wear-resistant alloy coating for a rotary drum filter scraper is characterized by comprising the following steps: comprises nano Al2O3The surface treatment, the preparation of the mixed material powder, the preparation of coating liquid, spraying and curing and vacuum cladding;
the nano Al2O3The surface treatment method comprises the steps of dissolving isopropyl distearoyl acyloxy aluminate in ethyl acetate, controlling the stirring speed, and slowly adding nano Al2O3After the material feeding is finished, the stirring is continued to ensure that the nano Al is mixed2O3After uniform dispersion, reducing the stirring speed to 1000-1600 rpm, controlling the temperature to 80-95 ℃ for reflux reaction for 2-5 hours, centrifugally separating, washing the obtained solid with absolute ethyl alcohol, and then drying in vacuum to obtain the nano Al after surface treatment2O3；
The nano Al2O3The particle size of the nano-particles is 15-45 nm;
the isopropyl distearoyl acyloxy aluminate, the ethyl acetate and the nano Al2O3The mass ratio of (A) to (B) is 1-2.5: 90-140: 15-25;
the preparation method of the mixed powder comprises the step of carrying out surface treatment on the nano Al2O3Mixing 3-aminopropyltrimethoxysilane, diethylaminomethyl triethoxysilane, iron-based alloy powder and deionized water to form slurry, ball-milling the slurry until the average particle size of the powder in the slurry is 2-8 microns, discharging, and drying the obtained ground slurry at 70-90 ℃ for 3-5Obtaining mixed material powder after hours;
the particle size of the iron-based alloy powder is 100-300 meshes, and the iron-based alloy powder comprises 4.3wt% of carbon, 2.1wt% of boron, 2.4wt% of silicon, 26wt% of chromium, 4.7wt% of nickel, 2.6wt% of tungsten and the balance less than 100wt% of iron;
the surface-treated nano Al2O3The mass ratio of the 3-aminopropyltrimethoxysilane to the diethylaminomethyl triethoxysilane to the iron-based alloy powder to the deionized water is 0.8-1.3: 0.5-1: 0.4-1: 20-40: 80-120;
mixing cyclopentyl methyl ether, organic polysilazane and gamma-isocyanatopropyl triethoxysilane, adding dimethyl silicone oil at a stirring speed of 3500-5000 r/min, slowly adding hydrophilic fumed silica powder, stirring and dispersing uniformly, then slowly adding the mixture powder, and continuously stirring for 1-2 hours after the material is added to obtain a coating liquid;
the molecular weight of the organic polysilazane is 710-910 g/mol, and the viscosity is 11-33 cP;
the particle size of the hydrophilic fumed silica powder is 10-50 nanometers;
the mass ratio of the cyclopentyl methyl ether, the organic polysilazane, the gamma-isocyanatopropyl triethoxysilane, the dimethyl silicone oil, the hydrophilic fumed silica powder to the mixed powder is 70-100: 9-19: 0.3-0.6: 0.1-0.4: 0.5-1: 50-80;
the spraying and curing method comprises the steps of removing oil stains on the surface of the rotary drum filter scraper, cleaning and drying, spraying a coating liquid, controlling the thickness of a wet film to be 30-50 micrometers, drying at normal temperature for 0.8-1.5 hours, heating to 130-180 ℃ under the protection of nitrogen, curing for 1-2.5 hours, and cooling to room temperature to obtain the rotary drum filter scraper with a cured coating;
the material of the rotary drum filter scraper is alloy steel;
the vacuum cladding method comprises the steps of placing a rotary drum filter scraper with a cured coating in a vacuum cladding furnace, controlling the vacuum degree to be 50-80 Pa, heating to 200-260 ℃ at the speed of 2-5 ℃/min, keeping the temperature for 30-60 minutes, heating to 950-1180 ℃ at the speed of 1-4 ℃/min, keeping the temperature for 20-40 minutes, and then cooling to the room temperature to form the wear-resistant alloy coating on the surface of the rotary drum filter scraper.
2. The method for preparing the wear-resistant alloy coating for the rotary drum filter scraper, according to claim 1, is characterized in that:
controlling the stirring speed, wherein the stirring speed is 4500-6000 rpm;
washing with the absolute ethyl alcohol for 2-4 times;
and (3) drying in vacuum at the temperature of 50-70 ℃ for 1-2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210683171.3A CN114774915B (en) | 2022-06-17 | 2022-06-17 | Preparation method of wear-resistant alloy coating for rotary drum filter scraper |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012166546A (en) * | 2011-01-27 | 2012-09-06 | Furukawa Electric Co Ltd:The | Ink receiving layer, coating liquid for forming ink receiving layer, ink receiving layer forming method, and conductive pattern forming method |
| US20130142965A1 (en) * | 2011-01-13 | 2013-06-06 | Gerald J. Bruck | Laser microcladding using powdered flux and metal |
| CN105219037A (en) * | 2015-11-04 | 2016-01-06 | 叶晓丹 | A kind of preparation method of the nanotube composite wire containing Functional silicones oxygen alkane |
| CN105659337A (en) * | 2013-09-27 | 2016-06-08 | 日立化成株式会社 | Powder magnetic core, method for manufacturing powder compact for magnetic core, pressing die and mold device for manufacturing powder magnetic core, and lubricant composition for pressing die for manufacturing powder magnetic core |
| CN107012463A (en) * | 2017-05-25 | 2017-08-04 | 山东大学 | A kind of alumina modified gradient laser cladding layer and preparation method thereof |
| CN107823950A (en) * | 2017-12-01 | 2018-03-23 | 安丘市翼鑫机械有限公司 | A kind of pre-spreading vacuum drum filter |
| US20180216237A1 (en) * | 2017-01-30 | 2018-08-02 | United Technologies Corporation | System and method for applying abrasive grit |
-
2022
- 2022-06-17 CN CN202210683171.3A patent/CN114774915B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130142965A1 (en) * | 2011-01-13 | 2013-06-06 | Gerald J. Bruck | Laser microcladding using powdered flux and metal |
| JP2012166546A (en) * | 2011-01-27 | 2012-09-06 | Furukawa Electric Co Ltd:The | Ink receiving layer, coating liquid for forming ink receiving layer, ink receiving layer forming method, and conductive pattern forming method |
| CN105659337A (en) * | 2013-09-27 | 2016-06-08 | 日立化成株式会社 | Powder magnetic core, method for manufacturing powder compact for magnetic core, pressing die and mold device for manufacturing powder magnetic core, and lubricant composition for pressing die for manufacturing powder magnetic core |
| CN105219037A (en) * | 2015-11-04 | 2016-01-06 | 叶晓丹 | A kind of preparation method of the nanotube composite wire containing Functional silicones oxygen alkane |
| US20180216237A1 (en) * | 2017-01-30 | 2018-08-02 | United Technologies Corporation | System and method for applying abrasive grit |
| CN107012463A (en) * | 2017-05-25 | 2017-08-04 | 山东大学 | A kind of alumina modified gradient laser cladding layer and preparation method thereof |
| CN107823950A (en) * | 2017-12-01 | 2018-03-23 | 安丘市翼鑫机械有限公司 | A kind of pre-spreading vacuum drum filter |
Non-Patent Citations (2)
| Title |
|---|
| 王行 等: "适于3D打印的金属及陶瓷粉末表面包覆研究进展", 《材料导报》 * |
| 陈神星: "3D打印用尼龙及其复合丝材的研究", 《中国优秀硕士学位论文全文数据库 工程科技1辑》 * |
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