CN113182156A - Stainless steel seamless steel pipe with precise inner diameter for hydraulic and pneumatic cylinder barrel - Google Patents
Stainless steel seamless steel pipe with precise inner diameter for hydraulic and pneumatic cylinder barrel Download PDFInfo
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- CN113182156A CN113182156A CN202110470085.XA CN202110470085A CN113182156A CN 113182156 A CN113182156 A CN 113182156A CN 202110470085 A CN202110470085 A CN 202110470085A CN 113182156 A CN113182156 A CN 113182156A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
- B05D7/222—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
- B05D7/225—Coating inside the pipe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/542—No clear coat specified the two layers being cured or baked together
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/18—Homopolymers or copolymers of tetrafluoroethene
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2301/00—Inorganic additives or organic salts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
- B05D2506/15—Polytetrafluoroethylene [PTFE]
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3009—Sulfides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The application relates to the field of metal workpieces, in particular to a precision inner-diameter stainless steel seamless steel pipe for a hydraulic cylinder and a pneumatic cylinder, wherein the inner wall of the steel pipe is treated through the following steps: s1, forming a first coating containing chromium carbide and tungsten carbide through supersonic flame spraying; s2, coating slurry containing high polymer and nano alumina powder on the first coating to form a second coating; and S3, curing the second coating, and then grinding and polishing the second coating to a standard inner diameter, thereby finishing the treatment of the steel pipe. In the process, the pores in the coating formed by the chromium carbide and the tungsten carbide on the inner wall of the steel pipe can be filled through the nano aluminum oxide and the high polymer, so that the density and the smoothness of the inner wall of the steel pipe are improved.
Description
Technical Field
The application relates to the field of metal workpieces, in particular to a precision inner-diameter stainless steel seamless steel tube for a hydraulic cylinder and a pneumatic cylinder.
Background
The cylinder barrel is an important component of the hydraulic cylinder and the pneumatic cylinder, and the performance of the cylinder barrel directly influences the durability, the sealing performance and the operational fluency of the hydraulic cylinder or the pneumatic cylinder. The cylinder barrel is generally made of stainless steel seamless steel tube with precise inner diameter, and in many aspects, the seamless stainless steel tube used for the cylinder barrel has high requirements on surface compactness, surface hardness, wear resistance and smoothness, so the inner surface of the cylinder barrel needs to be treated.
Supersonic flame spraying is a common metal surface treatment method, and a wear-resistant material can be coated on the surface of metal by ultrasonic spraying to form a wear-resistant coating with good uniformity. However, in the process of treating the inner surface of the steel pipe by supersonic flame spraying, the formed coating has poor compactness and often does not meet the requirements of stainless steel seamless steel pipes for hydraulic and pneumatic cylinders.
Disclosure of Invention
In order to improve the density and the smoothness degree of hydraulic pressure and pneumatic cylinder internal surface, this application provides accurate internal diameter stainless steel seamless steel pipe for hydraulic pressure and pneumatic cylinder
The hydraulic and pneumatic cylinder barrel that relates to in this application adopts following technical scheme with accurate internal diameter stainless steel seamless steel pipe: the inner wall of the stainless steel seamless steel pipe with the precise inner diameter for the hydraulic cylinder barrel and the pneumatic cylinder barrel is treated by the following steps:
s1, forming a first coating containing chromium carbide and tungsten carbide through supersonic flame spraying;
s2, coating slurry containing high polymer and nano alumina powder on the first coating to form a second coating;
and S3, curing the second coating, and then grinding and polishing the second coating to a standard inner diameter, thereby finishing the treatment of the steel pipe.
According to the technical scheme, the composite coating containing the chromium carbide and the tungsten carbide is formed by supersonic flame spraying treatment, the chromium and the tungsten exist in an eutectic form in the formation process of the coating, the crystal lattice distortion is not easy to occur on the whole, and the effect of reducing the surface energy is achieved. Generally, chromium carbide and tungsten carbide are both hard powder, so fine pores are easily formed in the spraying process, and then the macromolecular emulsion and nano-alumina powder are used for processing in the application, molecular chains in the macromolecular emulsion can penetrate into the gaps of the first coating and provide better viscosity, and the nano-alumina powder can fill the gaps, so that a structure with a more uniform and compact surface is formed, and the density of the inner surface of the steel pipe is greatly improved. Meanwhile, after the pore filling is finished, the surface tension is reduced, and the smoothness degree of the surface is further improved.
Optionally, in the first coating, the mass ratio of the chromium carbide to the tungsten carbide is (0.02-0.2) to 1.
Within the proportion range, the formed composite coating has the advantages of minimum tension, small distortion among crystal lattices, high integrity and good hardness. Has stronger wear resistance and better smoothness.
Optionally, in step S1, the chromium carbide and the tungsten carbide selected by the supersonic flame spraying are sieved with a mesh size of 600 mesh or larger.
In the process of spraying particles with the particle size of more than 600 meshes, gaps in a formed coating are small, the coating is suitable for filling ceramic nano particles, the integral uniformity is high, and the compactness and the surface smoothness are good.
Optionally, the high polymer is polytetrafluoroethylene.
The polytetrafluoroethylene has excellent corrosion resistance and good heat resistance, can be improved by coating the polytetrafluoroethylene, and simultaneously, the nano-alumina powder can make up the disadvantage of poor wear resistance of the polytetrafluoroethylene. In addition, because the surface of the polytetrafluoroethylene has no active groups, the influence on the smoothness is small, and the formed inner surface of the steel pipe has a low friction coefficient.
Optionally, in step S2, the slurry specifically includes the following components in parts by mass:
the metal sulfide has better wear resistance and stronger coupling property, and a certain amount of metal sulfide is added into the slurry, so that the wear resistance of the surface of the second coating can be further improved, and the friction force of the surface of the second coating can be reduced.
Optionally, the mass ratio of the nano alumina powder used in step S2 to the chromium carbide used in step S1 is (0.005-0.2): 1 per unit surface area of the steel pipe.
With the above ratio, the nano alumina powder can be well filled in the pores in the first coating layer to form a smoother surface, and an excessive or insufficient amount of the nano alumina powder increases the surface friction coefficient.
Optionally, the metal sulfide comprises molybdenum disulfide, nickel sulfide and manganese sulfide in a mass ratio of 1: 0.15-0.4: 0.03-0.2.
Repeated experiments show that the second coating formed by adopting the combination of molybdenum disulfide, nickel sulfide and manganese sulfide has better compactness, hardness and wear resistance. In addition, the molybdenum disulfide has a good surface lubricating effect, can obviously improve the surface smoothness of the coating, and reduces the friction coefficient.
Optionally, in step S2, the slurry further includes 0.2 to 0.5 parts by mass of a leveling agent and 0.1 to 0.3 parts by mass of a film forming agent.
The leveling agent and the film forming agent in the components can promote the surface of the second coating to form a more complete and smooth film structure, improve the integrity of the second coating and further reduce the friction coefficient.
Optionally, in step S2, the slurry further includes 0.5 to 1 part by mass of polycarbomethylsilane.
The polycarbomethylsilane has stronger coupling property, stronger adhesion property to both organic phase and inorganic phase, and the coating formed after curing treatment has stronger adhesion capability and higher wear resistance.
Optionally, in step S3, the curing process includes the following steps: and (3) placing the steel pipe coated with the second coating in a vacuum hot oven, drying at 70-80 ℃ for 10-15 min, and then completely drying at 160-190 ℃.
According to the technical scheme, preheating and drying are carried out firstly, then high-temperature drying is carried out, the formed coating is good in strength, not prone to cracking, good in integrity, strong in adhesion strength and good in wear resistance while the whole coating is not prone to cracking.
In summary, the present application includes at least one of the following advantages:
1. according to the method, the first coating containing chromium carbide and tungsten carbide is formed through supersonic flame spraying, then the slurry containing high polymer and nano ceramic is coated on the first coating, and the pores on the surface of the first coating are filled, so that the density and the smoothness of the surface of the stainless steel seamless steel pipe are improved.
2. In a further arrangement of the present application, the slurry contains polytetrafluoroethylene, nano alumina powder and sulfide, which contributes to further improvement of the smoothness and wear resistance of the surface.
3. In this application further sets up, through preheating treatment earlier, high temperature treatment's mode is cured again, and the coating that forms is more complete even, and smoothness degree and wear resistance are all better.
Detailed Description
The present application will be described in further detail with reference to examples.
In the following examples, the sources of some of the feedstocks are shown in table 1.
TABLE 1 material source model table
| Composition (I) | Source | Model/specification |
| Polytetrafluoroethylene emulsion | Dupont/USA | DISP33 |
| Nano alumina powder | Shanghai super WeinaRice material | Alpha type, specific surface area 58 |
| Emulsifier | Shanghai Milin | Ammonium perfluorooctanoic acid |
| Leveling agent | Shanghai Milin | Isophorone |
| Film forming agent | Dow/USA | Pure acrylic emulsion AC-8349 |
| Chromium carbide powder | Nano material for Zhongtian | Cr3C2 |
| Tungsten carbide powder | Nano material for Zhongtian | WC |
In example 1, the base material of the precision inner diameter stainless steel seamless steel tube for the hydraulic and pneumatic cylinder is 45# steel, and the normalizing temperature of the steel tube is 850 ℃, the quenching temperature is 840 ℃ and the tempering temperature is 600 ℃. The inner wall of the container is activated by sand blasting and then treated as follows.
S1, forming a first coating containing chromium carbide and tungsten carbide by supersonic flame spraying, wherein the specific parameters are shown in Table 2.
TABLE 2 hypersonic flame spraying parameter table
In step S1, the powders of chromium carbide and tungsten carbide are both sieved through a 1000 mesh sieve, and the mass ratio of chromium carbide to tungsten carbide is 0.1: 1.
And S2, coating the slurry on the first coating to form a second coating. The slurry contains polytetrafluoroethylene emulsion, nano alumina powder and an emulsifier, and the specific formula is shown in table 3.
In step S1, carbon is contained in the first and second coating layers corresponding to the surface area of the steel pipeThe dosage of chromium is 12mg/cm2The dosage of the nano alumina powder is 1.2mg/cm2The dosage of the slurry is 26.4mg/cm2。
And S3, curing the second coating, and then grinding and polishing to a standard inner diameter to finish the processing of the steel pipe.
In the curing step, the steel tube is first placed in a vacuum oven and dried at 70 ℃ for 10min, and then at 160 ℃ until completely dried (about 2 h).
Examples 2 to 13, the precision bore stainless steel seamless steel pipe for hydraulic and pneumatic cylinders was different from example 1 in that the composition of the slurry was changed as shown in table 3.
Table 3, recipe (parts by mass) of slurry ingredients in examples 1 to 13
In examples 1 to 13, the metal sulfide was a composition of molybdenum disulfide, nickel sulfide and manganese sulfide in a mass ratio of 1: 0.3: 0.1.
In examples 2 to 13, the ratio of the addition amount of the nano alumina powder to the amount of the chromium carbide was kept unchanged from example 1, and the amount of the slurry was adjusted accordingly.
Examples 14 to 24, precision bore stainless steel seamless steel pipes for hydraulic and pneumatic cylinders, which are different from example 3 in that the specific composition of the metal sulfide is shown in Table 4.
TABLE 4 compounding ratio of metal sulfides in examples 1 to 24
| Numbering | Molybdenum disulfide | Nickel sulfide | Manganese sulfide | Copper sulfide | Chromium sulfide |
| Examples 1 to 13 | 1 | 0.2 | 0.1 | 0 | 0 |
| Example 14 | 1 | 0.15 | 0.03 | 0 | 0 |
| Example 15 | 1 | 0.1 | 0.1 | 0 | 0 |
| Example 16 | 1 | 0.4 | 0.2 | 0 | 0 |
| Example 17 | 1 | 0.2 | 0 | 0 | 0 |
| Example 18 | 1 | 0.5 | 0.1 | 0 | 0 |
| Example 19 | 1 | 0.2 | 0.3 | 0 | 0 |
| Example 20 | 1 | 0 | 0 | 0.3 | 0.05 |
| Example 21 | 0 | 1 | 0 | 1 | 1 |
| Example 22 | 0 | 0 | 1 | 0.2 | 0 |
| Example 23 | 1 | 0.2 | 0 | 0.2 | 0.3 |
| Example 24 | 0 | 1 | 0 | 0.01 | 3 |
Example 25, a precision bore stainless steel seamless steel pipe for hydraulic and pneumatic cylinder tubes, which is different from example 3, is characterized in that the mass ratio of chromium carbide to tungsten carbide is 0.01: 1 in step S1.
Example 26, a precision inside diameter stainless steel seamless steel pipe for hydraulic and pneumatic cylinders, which is different from example 3 in that the mass ratio of chromium carbide to tungsten carbide is 0.02: 1 in step S1.
Example 27, a precision inside diameter stainless steel seamless steel pipe for hydraulic and pneumatic cylinders, which is different from example 3, is that the mass ratio of chromium carbide to tungsten carbide is 0.2: 1 in step S1.
Example 28, a precision inside diameter stainless steel seamless steel pipe for hydraulic and pneumatic cylinders, which is different from example 3, is that the mass ratio of chromium carbide to tungsten carbide is 0.5: 1 in step S1.
Example 29, a stainless seamless steel pipe with a precise inner diameter for hydraulic and pneumatic cylinders, was different from example 3 in that the amount of the slurry used was adjusted so that the mass ratio of the nano-alumina powder to the chromium carbide used per unit area was 0.01: 1.
Example 30 is a stainless seamless steel pipe with a precise inner diameter for hydraulic and pneumatic cylinders, which is different from example 3 in that the amount of the slurry used is adjusted so that the mass ratio of the nano alumina powder to the chromium carbide used per unit area is 0.005: 1.
Example 31, a stainless seamless steel pipe with a precise inner diameter for hydraulic and pneumatic cylinders, was different from example 3 in that the amount of the slurry used was adjusted so that the mass ratio of the nano-alumina powder to the chromium carbide used per unit area was 0.001: 1.
Example 32, a stainless seamless steel pipe with a precise inner diameter for a hydraulic cylinder or a pneumatic cylinder, was different from example 3 in that the amount of the slurry used was adjusted so that the mass ratio of the nano-alumina powder to the chromium carbide used per unit area was 0.2: 1.
Example 33 is a stainless seamless steel pipe with a precise inner diameter for hydraulic and pneumatic cylinders, which is different from example 3 in that the amount of the slurry used is adjusted so that the mass ratio of the nano alumina powder to the chromium carbide used per unit area is 0.5: 1.
Example 34, precision bore stainless steel seamless steel pipe for hydraulic and pneumatic cylinders, is different from example 3 in that in the curing process step of step S3, the steel pipe is first placed in a vacuum oven, dried at 80 ℃ for 15min, and then dried at 160 ℃ until completely dried.
Example 35, a precision bore stainless steel seamless steel pipe for hydraulic and pneumatic cylinders, is different from example 3 in that in the curing process step of step S3, the steel pipe is placed in a vacuum oven and then dried at 160 ℃ to be thoroughly dried.
Example 36, the difference between the precision bore stainless steel seamless steel tube for hydraulic and pneumatic cylinder and example 3 is that the chromium carbide and tungsten carbide particles used are selected from 200 mesh or more sieve components.
Example 37, the difference between the precision bore stainless steel seamless steel tube for hydraulic and pneumatic cylinder and example 3 is that the chromium carbide and tungsten carbide particles used are selected from 600 mesh sieve components.
For the above examples, comparative examples were set as follows.
Comparative example 1, a precision bore stainless steel seamless steel tube for hydraulic and pneumatic cylinders was different from example 3 in that tungsten carbide was replaced with equal mass of chromium carbide.
Comparative example 2, a precision bore stainless steel seamless steel tube for hydraulic and pneumatic cylinders was different from example 3 in that chromium carbide was replaced with tungsten carbide of equal mass.
Comparative example 3, a stainless seamless steel pipe with a precise inner diameter for hydraulic and pneumatic cylinders, which is different from example 1 in that the steel pipe is directly ground and polished after being spray-coated with supersonic flame, without including step S2.
Comparative example 4, precision bore stainless steel seamless steel pipe for hydraulic and pneumatic cylinders, which is different from example 1 in that nano alumina powder is not contained in the slurry.
For the above examples, the following parameters were measured in accordance with the national standards.
1. Surface compactness: by means of the porosity measuring method and reverse measurement, come card full-automatic porosity measuring system is adopted.
2. Microhardness: the measurement was carried out by an HVS-type 1000 durometer.
3. Surface friction coefficient: the method is carried out by an MM-200 type abrasion tester, the rotation rate of a friction ring is 150r/min, the load is 350N, the friction coefficient at the beginning of the experiment and the friction coefficient after 150min of the experiment are recorded, and the weight loss of a unit area before and after abrasion is recorded.
Since it is difficult to perform the above experiment on the steel pipe, the steel sheet is actually used for the measurement in the above experiment. The steel sheet was machined in the same manner as the steel pipe in the corresponding example.
First, the above experiments were carried out for examples 1 to 13, and the results are shown in table 5.
Table 5, examples 1 to 13 and comparative examples 1 to 5
By comparing the above examples and comparative examples, it can be seen that the technical solutions involved in the present application have the beneficial effects of reducing porosity, increasing apparent hardness, reducing friction coefficient, etc. In examples 1 to 5, the amount of the nano-alumina powder added to the slurry was adjusted, and the nano-alumina powder mainly provided a pore-filling effect, and too much or too little of the nano-alumina powder resulted in low flatness of the entire surface, which further affected the friction coefficient to a certain extent. The film forming agent and the leveling agent are added in the embodiment 7-8, so that the slurry can be more uniform and stable in the slurry coating process, and a better adhesive film is formed. In embodiments 9 to 13, polycarbomethylsilane with different amounts is added, which has a good crosslinking property, and inevitably generates a certain metal oxide component during the supersonic flame spraying process, and can be well coupled with the active component, thereby improving the adhesion strength between the first coating and the second coating, and forming a firm structure. However, the polycarbomethylsilane molecule itself can prevent the nano alumina particles from filling the pores, so that the addition of the polycarbomethylsilane molecule in an excessive amount can have an adverse effect on the porosity of the product.
In comparative examples, chromium carbide and tungsten carbide were absent in comparative example 1 and comparative example 2, respectively, and the strength and wear resistance of the whole were inferior to those of the alloys of the two. Probably due to the lower surface energy of the crystals formed by the single metal, the poor adsorption of the polymer and nano alumina powder in the slurry, and the poor flatness after the second coating is formed. Comparative example 3 is a common supersonic flame spraying process, and comparative example 4 does not use nano alumina powder, which results in poor surface density and high porosity, and further obviously improves the friction coefficient.
Further, the results of the above experiments for examples 14 to 24 are shown in Table 6.
Table 6 and Experimental results of examples 14 to 24
In the above examples, the composition ratio of the metal sulfide in the slurry was adjusted, and the result was affected differently. The reason for this presumption may be the following: 1. intermolecular forces among the metal sulfide, the chromium carbide and the tungsten carbide are different, so that the difference between the wear resistance and the peeling strength is caused; 2. the size difference of the metal atoms generates certain influence on the stress of the metal atoms in the metal atoms; 3. the degree of distortion of the lattice by the metal atoms has some effect on the activation energy of the metal surface. Therefore, different effects are generated by doping different metal sulfides, and experiments show that the metal sulfide proportioning in the embodiment 3, the embodiment 14 and the embodiment 16 has better effects.
Further, the results of the above experiments conducted on examples 25 to 35 are shown in Table 7.
Table 7 and Experimental results of examples 15 to 37
In the above technical solution, other parameters of the present application are further adjusted. In examples 25 to 28, the amounts of chromium carbide and tungsten carbide were adjusted, and the adjustment of the amounts of chromium carbide and tungsten carbide did not greatly affect the overall performance in the mass ratio range of (0.02 to 0.2) to 1, but when the tungsten carbide ratio was too high, the overall strength and porosity were poor, and the surface hardness was poor. When the amount of chromium carbide is too large, the degree of smoothness is adversely affected.
In examples 29 to 33, the amount of the nano alumina powder was adjusted, and the amount of the slurry was adjusted accordingly. The proper amount of nano alumina can fill the pores of the surface, but too much or too little amount of nano alumina has a negative effect on the surface. In example 35, the steel pipe was directly dried and cured without preheating, and the adhesion and the density of the surface coating were deteriorated.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The precise inner-diameter stainless steel seamless steel tube for the hydraulic and pneumatic cylinder barrel is characterized in that the inner wall of the steel tube is treated by the following steps:
s1, forming a first coating containing chromium carbide and tungsten carbide through supersonic flame spraying;
s2, coating slurry containing high polymer and nano alumina powder on the first coating to form a second coating;
and S3, curing the second coating, and then grinding and polishing the second coating to a standard inner diameter, thereby finishing the treatment of the steel pipe.
2. The precise inside diameter stainless steel seamless steel tube for the hydraulic and pneumatic cylinder tube according to claim 1, wherein the mass ratio of the chromium carbide to the tungsten carbide in the first coating is (0.02-0.2): 1.
3. The precise inside diameter stainless steel seamless tube for a hydraulic and pneumatic cylinder as claimed in claim 1, wherein in step S1, the chromium carbide and tungsten carbide selected for supersonic flame spraying are screened with a mesh size of 600 mesh or larger.
4. The precise inside diameter stainless steel seamless steel tube for a hydraulic and pneumatic cylinder as claimed in claim 1, wherein the high polymer is polytetrafluoroethylene.
5. The precision inside diameter stainless steel seamless steel tube for the hydraulic and pneumatic cylinder barrel of claim 4, wherein in step S2, the slurry specifically comprises the following components in parts by mass:
50 parts of polytetrafluoroethylene emulsion;
6-14 parts of nano alumina powder;
5-10 parts of an emulsifier;
3-6 parts of metal sulfide.
6. The precise inside diameter stainless steel seamless steel tube for a hydraulic and pneumatic cylinder according to claim 5, wherein the mass ratio of the nano alumina powder used in step S2 to the chromium carbide used in step S1 is (0.005-0.2): 1 per unit surface area of the steel tube.
7. The precise inner diameter stainless steel seamless steel tube for the hydraulic and pneumatic cylinder barrel according to claim 5, wherein the metal sulfide comprises molybdenum disulfide, nickel sulfide and manganese sulfide in a mass ratio of 1: 0.15-0.4: 0.03-0.2.
8. The precise inner diameter stainless steel seamless steel tube for the hydraulic and pneumatic cylinder barrel according to claim 5, wherein in step S2, the slurry further comprises 0.2-0.5 parts by mass of a leveling agent and 0.1-0.3 parts by mass of a film forming agent.
9. The precision inside diameter stainless steel seamless steel tube for the hydraulic and pneumatic cylinder barrel according to claim 5, wherein in step S2, the slurry further comprises 0.5 to 1 part by mass of polycarbomethylsilane.
10. The precision inside diameter stainless steel seamless steel tube for a hydraulic and pneumatic cylinder as claimed in claim 5, wherein in step S3, the solidification process specifically comprises the following steps: and (3) placing the steel pipe coated with the second coating in a vacuum hot oven, drying at 70-80 ℃ for 10-15 min, and then completely drying at 160-190 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110470085.XA CN113182156B (en) | 2021-04-28 | 2021-04-28 | Stainless steel seamless steel pipe with precise inner diameter for hydraulic and pneumatic cylinder barrel |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070141285A1 (en) * | 2005-12-20 | 2007-06-21 | Jacob Lahijani | Pipe preformed liner comprising metal powder |
| US20090078328A1 (en) * | 2007-09-21 | 2009-03-26 | E. I. Du Pont De Nemours And Company | Pipe Interior Coatings |
| CN105040029A (en) * | 2015-07-02 | 2015-11-11 | 中电投宁夏能源铝业工程检修有限公司 | Preparation method of aluminum suction pipe |
| CN108057594A (en) * | 2017-10-31 | 2018-05-22 | 陕西恒威能源科技有限公司 | The preparation method of high corrosion-resistant gas pipeline |
| CN111617926A (en) * | 2020-07-10 | 2020-09-04 | 广州粤鑫激光科技有限公司 | Coating roller, preparation method and application thereof, and copper-clad plate |
| CN112295880A (en) * | 2020-11-06 | 2021-02-02 | 常州市盛诺管业有限公司 | Machining process of precision seamless steel tube for gas spring |
-
2021
- 2021-04-28 CN CN202110470085.XA patent/CN113182156B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070141285A1 (en) * | 2005-12-20 | 2007-06-21 | Jacob Lahijani | Pipe preformed liner comprising metal powder |
| US20090078328A1 (en) * | 2007-09-21 | 2009-03-26 | E. I. Du Pont De Nemours And Company | Pipe Interior Coatings |
| CN105040029A (en) * | 2015-07-02 | 2015-11-11 | 中电投宁夏能源铝业工程检修有限公司 | Preparation method of aluminum suction pipe |
| CN108057594A (en) * | 2017-10-31 | 2018-05-22 | 陕西恒威能源科技有限公司 | The preparation method of high corrosion-resistant gas pipeline |
| CN111617926A (en) * | 2020-07-10 | 2020-09-04 | 广州粤鑫激光科技有限公司 | Coating roller, preparation method and application thereof, and copper-clad plate |
| CN112295880A (en) * | 2020-11-06 | 2021-02-02 | 常州市盛诺管业有限公司 | Machining process of precision seamless steel tube for gas spring |
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