CN117089800A - Supersonic flame gun and method for preparing amorphous alloy coating by using same - Google Patents
Supersonic flame gun and method for preparing amorphous alloy coating by using same Download PDFInfo
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- CN117089800A CN117089800A CN202311059639.2A CN202311059639A CN117089800A CN 117089800 A CN117089800 A CN 117089800A CN 202311059639 A CN202311059639 A CN 202311059639A CN 117089800 A CN117089800 A CN 117089800A
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- 229910000808 amorphous metal alloy Inorganic materials 0.000 title claims abstract description 56
- 238000000576 coating method Methods 0.000 title claims abstract description 46
- 239000011248 coating agent Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000002485 combustion reaction Methods 0.000 claims abstract description 83
- 239000007921 spray Substances 0.000 claims abstract description 39
- 239000000446 fuel Substances 0.000 claims abstract description 35
- 238000005507 spraying Methods 0.000 claims abstract description 14
- 239000007800 oxidant agent Substances 0.000 claims abstract description 9
- 230000001590 oxidative effect Effects 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims description 40
- 239000002245 particle Substances 0.000 claims description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 239000001294 propane Substances 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 5
- 239000012159 carrier gas Substances 0.000 claims description 3
- 238000010285 flame spraying Methods 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 239000007795 chemical reaction product Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007749 high velocity oxygen fuel spraying Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
-
- 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
- B22F1/08—Metallic powder characterised by particles having an amorphous microstructure
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
- Nozzles (AREA)
Abstract
The invention provides a supersonic flame spray gun and a method for preparing an amorphous alloy coating by the supersonic flame spray gun, wherein the supersonic flame spray gun is of an integrated structure and comprises a combustion chamber, a Laval venturi tube which is connected with the tail end of the combustion chamber in a matching way and a spray gun barrel which is connected with the tail end of the Laval venturi tube in a matching way; the combustion chamber is provided with a fuel inlet, a combustion improver inlet and an ignition plug in a matching way; the fuel inlet is arranged at the right center of the head end part of the combustion chamber in a matching way; the combustion improver inlet is a circle of surrounding combustion improver inlet which is arranged along the circumferential periphery of the fuel inlet and takes the shape of a circular ring; the ratio of the width of the oxidant inlet to the width of the fuel inlet is 1:3. the invention can obtain the amorphous alloy coating with high quality and high bonding degree, and can solve the problems of low efficiency of industrial spraying equipment and incapability of well preparing the amorphous alloy coating.
Description
Technical Field
The invention relates to the technical field of supersonic flame spraying, in particular to a supersonic flame spray gun and a method for preparing an amorphous alloy coating by using the same.
Background
In engineering construction, problems such as corrosion, abrasion and fatigue of metal structures are needed to be solved, and structural loss and economic loss caused by corrosion are serious in both land and offshore environments. At present, china is in the key period of ocean strategic implementation, and no matter in the open sea transportation, ocean new energy development or the sustainable development of shipbuilding industry, the higher-level anti-corrosion material cannot be separated, but the requirements on the green pollution-free ocean anti-corrosion material are indispensable. The amorphous alloy, namely the popular metal glass, integrates high hardness, corrosion resistance, high plasticity, soft magnetism and high strength, has the characteristic characteristics of metal and the flow characteristics of liquid, and is the latest metal material with green, environment-friendly, high quality and high performance. The amorphous alloy has no defects such as dislocation, grain boundary and the like, so the tensile strength and the hardness are high. The hardness value is closely related to the types and the amounts of the added elements. In an amorphous alloy system, the strength of the iron-based amorphous alloy is 3-4 times that of the traditional high-strength steel, and the iron-based amorphous alloy integrates excellent corrosion resistance and good friction resistance, so that the iron-based amorphous alloy can play a role in double protection as a coating material, and has extremely important significance.
The supersonic flame spraying is also called high-speed oxygen spraying (HVOF High VelocityOxy-fuel), which is a new spraying technology developed based on the conventional flame spraying and explosion spraying technology in the early 80 th century, fully utilizes the potential of the conventional flame spraying, utilizes the potential advantages of the conventional flame spraying, and develops a high-energy high-speed spraying technology. The method is characterized in that combustible gases such as hydrogen, C3H3, C3H6 and the like are mixed with high-pressure oxygen, or liquid fuels such as kerosene, alcohol and the like are mixed with the high-pressure oxygen, and the mixture is mixed in a special combustion chamber to generate a severe combustion reaction. The combustion reaction can release huge energy to make the reaction product expand violently in the combustion chamber, and the reaction product has certain heat and speed at the moment, but can not meet the requirement of spraying particles, so that a special Laval nozzle is adopted to make the sprayed reaction product be bound by a Laval pipe structure to generate high-temperature and high-speed flame flow, thereby generating a supersonic flame, the combustion speed can reach 1500-2000 m per second, and the combustion temperature can reach 2000-3500k. The powder is radially sprayed into the spray gun through the powder spraying opening, nitrogen is used as a carrier, the high-temperature high-speed flame flow can accelerate, the temperature of the powder is raised to be in a molten or semi-molten state, and the powder is conveyed along the axial direction or the horizontal direction, and is impacted and attached on the substrate. Different coatings with different properties can be achieved by adding different volume mass fractions of powder according to the material requirements.
The supersonic flame gun is mainly composed of a combustion chamber, a Lava l throat pipe and a gun spray pipe. The key to determining whether the high-quality coating can be obtained by the supersonic flame spray gun is that whether a high-speed high-temperature flame flow can be formed or not, so that the structural requirement on the spray gun is very high, and therefore, whether the combustion chamber can fully burn the combustion matters and the oxidant or not is important, and whether the Laval pipe can change the internal energy of the high-temperature high-speed flame into kinetic energy so that the amorphous alloy powder has high quality speed or not.
Disclosure of Invention
Aiming at the problems in the background technology, the invention provides a supersonic flame spray gun capable of obtaining an amorphous alloy coating with high quality and high bonding degree and solving the problems of low efficiency and poor preparation of the amorphous alloy coating of industrial spraying equipment and a method for preparing the amorphous alloy coating.
In order to solve the technical problems, the supersonic flame spray gun provided by the invention is of an integrated structure and comprises a combustion chamber, a Laval throat matched and connected to the tail end of the combustion chamber and a spray gun barrel matched and connected to the tail end of the Laval throat; the combustion chamber is provided with a fuel inlet, a combustion improver inlet and an ignition plug in a matching way; the fuel inlet is arranged at the right center of the head end part of the combustion chamber in a matching way; the combustion improver inlet is a circle of surrounding combustion improver inlet which is arranged along the circumferential periphery of the fuel inlet and takes the shape of a circular ring; the ratio of the width of the oxidant inlet to the width of the fuel inlet is 1:3.
the supersonic flame gun, wherein: the length ratio of the inlet section to the outlet section of the Laval throat is 1:4.
the supersonic flame gun, wherein: the connection part of the Laval pipe and the combustion chamber is provided with a chamfer, and the ratio of the minimum diameter part of the Laval pipe to the diameter of the combustion chamber is 1:3.
the supersonic flame gun, wherein: the side wall of the gun barrel of the spray gun is provided with a powder feeding port in a matching way.
The supersonic flame gun, wherein: the aspect ratio of the lance tube was 12.5:1.
The supersonic flame gun, wherein: the length of the gun barrel of the spray gun is 150mm, and the width of the gun barrel of the spray gun is 12mm.
The supersonic flame gun, wherein: the width of the combustion chamber is 24mm.
The supersonic flame gun, wherein: the ignition plug is arranged on the inner wall of the middle section of the combustion chamber in a matching way.
The method for preparing the amorphous alloy coating by using the supersonic flame gun is based on the supersonic flame gun and specifically comprises the following steps of:
(1) Propane and oxygen are respectively fed into the combustion chamber through a combustion improver inlet and a fuel inlet of the combustion chamber;
(2) Ignition is performed through an ignition plug on the combustion chamber, so that fuel is fully combusted in the combustion chamber;
(3) The flame flow after combustion passes through a Laval throat to generate supersonic flame flow;
(4) The amorphous alloy powder is sent into the gun barrel of the spray gun through a powder sending port of the gun barrel of the spray gun, and nitrogen is used as powder carrier gas;
(5) The flame flow formed in the step (3) drives amorphous alloy powder to accelerate and heat, and the amorphous alloy powder is sprayed out from a gun barrel of a spray gun;
(6) Powder sprayed from a gun barrel of the spray gun flies in the air and finally collides into the surface of a substrate of a required coating;
(7) Repeating the steps (1) - (6) to finally form the amorphous alloy coating.
The method for preparing the amorphous alloy coating by the supersonic flame gun comprises the following steps: the total mass flow rate of the propane and the oxygen in the step (1) is 16g/s, and the mass ratio is 1:3.
the method for preparing the amorphous alloy coating by the supersonic flame gun comprises the following steps: the amorphous alloy powder adopted in the step (4) is Fe 48 Cr 15 Mo 14 C 15 B 6 Y 2， The particle size of the powder is 20-40 microns, the flow rate of the powder is 1g/s, and the flow rate of the nitrogen is 10g/s.
The method for preparing the amorphous alloy coating by the supersonic flame gun comprises the following steps: the spraying distance suitable for the method is 300-400mm, the temperature range of the formed supersonic flame flow is 2200-2800K, and the flame flow speed is 1500-2500m/s.
By adopting the technical scheme, the invention has the following beneficial effects:
the invention optimizes the process conditions by optimizing the dimensional parameters of the combustion chamber, laval throat and lance. The inlet of the fuel and the combustion improver is optimized, so that the fuel and the combustion improver can be fully mixed and well fill the combustion chamber, the combustion reaction can be fully and quickly carried out, and the influence on the track and the flight parameters of the amorphous alloy powder caused by disordered products due to insufficient combustion is avoided. The parameters of the Laval throat are optimized, so that the generated flame flow can be accelerated better. The amorphous alloy powder suitable for the matrix material is added, the flight parameters of the amorphous alloy powder can be reasonably controlled through high-speed high-temperature flame flow, and the high-quality coating with high quality, wear resistance and high density can be prepared. The method has small influence on the matrix material, high efficiency and good coating quality, and can be applied to large engineering machines and small precise parts.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are some embodiments of the invention and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the structure of a supersonic flame gun of the present invention;
FIG. 2 is a schematic illustration of the structure of the fuel inlet and surrounding oxidant inlet of the supersonic flame gun of the present invention;
FIG. 3 is a schematic illustration of the dimensional proportions of the fuel inlet and the surrounding oxidant inlet of the supersonic flame gun of the present invention;
FIG. 4 is a schematic diagram showing the effect of the mass flow ratio n of the oxidant oxygen to the fuel propane on the temperature and pressure of the combustion chamber and on the Laval throat speed in the method for preparing an amorphous alloy coating by using a supersonic flame gun according to the present invention;
FIG. 5 is a schematic diagram showing the effect of different longitudinal injection velocities on particle trajectories, for example, a 40 μm particle size, in a method of preparing an amorphous alloy coating using a supersonic flame gun according to the present invention;
FIG. 6 is a schematic diagram showing the effect of different amorphous alloy particle sizes on the speed of the supersonic flame spraying process in the method for preparing amorphous alloy coating by using the supersonic flame gun of the present invention;
FIG. 7 is a schematic diagram showing the effect of different amorphous alloy particle sizes on the temperature of the supersonic flame spraying process in the method for preparing an amorphous alloy coating by using a supersonic flame gun according to the present invention;
FIG. 8 is a schematic diagram of parameters such as velocity, temperature and pressure of air flow in a supersonic flame gun under optimal spray conditions in a method for preparing an amorphous alloy coating by a supersonic flame gun according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is further illustrated with reference to specific embodiments.
As shown in fig. 1-3, the supersonic flame gun provided in this embodiment is of unitary construction and comprises a combustion chamber 1, a laval throat 2 and a gun barrel 3.
The width of the combustion chamber 1 is 24mm, the right center of the end part of the head end of the combustion chamber is provided with a fuel inlet 11 in a matching way, and the circumferential periphery of the fuel inlet 11 is provided with a surrounding combustion improver inlet 12 in a circular ring shape in a matching way; the ratio of the width of the surrounding oxidant inlet 12 to the fuel inlet 11 is 1:3, a step of; wherein, the middle section inner wall of the combustion chamber 1 is provided with an ignition plug 13 in a matching way.
The Laval throat 2 is connected to the tail end of the combustion chamber 1 in a matching way, and the length ratio of an inlet section to an outlet section is 1:4, a step of; the connection part of the Laval pipe 2 and the combustion chamber 1 is provided with a chamfer angle, and the ratio of the minimum diameter part of the Laval pipe 2 to the diameter of the combustion chamber 1 is 1:3.
the gun barrel 3 is connected with the outlet end of the Laval choke 2 in a matching way, and the side wall of the gun barrel is provided with a powder feeding port 31 in a matching way; wherein the aspect ratio of the lance tube 3 is 12.5:1; the lance tube 3 has a length of 150mm and a width of 12mm.
In order to just prepare a high-quality high-density corrosion-resistant amorphous alloy coating, the supersonic flame spray gun can realize the operation, a fluid simulation actual spraying condition is carried out by CFD fluid mechanics finite element software Fluent, a three-dimensional simulation model is established, iron-based amorphous alloy powder is simulated to be added as a coating material, propane is used as fuel, oxygen is used as a combustion improver, a k-epsilon standard turbulence model, a vortex dissipation combustion model and a DPM model are applied in the Fluent to further simulate the condition of the spray gun in the actual operation, the simulated combustion reaction, flame characteristics and the track state of particles are analyzed, and a conclusion is obtained: the mass flow ratio of the optimal fuel to the combustion improver is 1:3, the particle size is optimally 20-40 mu m, and the distance between the optimal fuel and the sprayed substrate is 300-350mm, so that the optimal high-quality amorphous alloy coating can be obtained.
The invention relates to a method for preparing an amorphous alloy coating by a supersonic flame gun, which specifically comprises the following steps:
(1) Propane and oxygen were fed into the combustion chamber 1 through the oxidant inlet 12 and the fuel inlet 11 of the combustion chamber 1, respectively, at a total mass flow rate of 16g/s, in a mass ratio of 1:3, a step of;
(2) Ignition by the ignition plug 13 of the combustion chamber 1, so that the fuel is sufficiently combusted in the combustion chamber 1;
(3) The flame flow after combustion passes through a Laval throat pipe 2 to generate supersonic flame flow;
(4) Amorphous alloy powder is fed into the gun barrel 3 through a powder feeding port 31 of the gun barrel 3, and nitrogen is used as powder carrier gas; the adopted amorphous alloy powder is Fe 48 Cr 15 Mo 14 C 15 B 6 Y 2 The particle size of the powder is 5-30 microns, the flow rate of the powder is 1g/s, and the flow rate of nitrogen is 10g/s;
(5) The flame flow formed in the step (3) drives amorphous alloy powder to accelerate and heat, and the amorphous alloy powder is sprayed out of the gun barrel 3 of the spray gun;
(6) The powder sprayed from the gun barrel 3 flies in the air and finally collides with the surface of the substrate of the required coating;
(7) Repeating the steps (1) to (6), and finally forming the amorphous alloy coating.
The spray distance suitable for the method for preparing the amorphous alloy coating by the supersonic flame gun is 300-400mm, the temperature range of the formed supersonic flame flow is 2200-2800K, and the flame flow speed is 1500-2500m/s.
As shown in fig. 4, in the supersonic flame spraying process, the ratio of fuel to combustion improver is very important, so that the sufficient combustion of the fuel and the combustion improver in the combustion chamber 1 is very important for the preparation of the coating, and under the condition that the total flow of oxygen/propane in the combustion chamber 1 is constant, the mixed combustion of oxygen and propane has an optimal mixing ratio, and the combustion of oxygen and propane is most sufficient when the optimal mixing ratio is adopted, so that the released heat is the highest, and the temperature in the combustion chamber 1 is the highest. As can be seen from fig. 4, at n=3.0, the speed, temperature and pressure all get maximum values. It can be summarized that when n is less than 3.0, the fuel is excessive, the energy and heat generated by the reaction are low due to insufficient combustion, and the momentum and temperature for converting the energy into spray particles are low; when n is more than 3.0, the oxygen is excessive, and insufficient fuel is reacted, so that the final result also causes poor flight parameters of particles and influences the quality of the coating. It can be concluded from a combination of the three graphs in fig. 4 that this optimum mixing ratio is n=3.0.
As shown in fig. 5, in the process of carrying out supersonic flame spraying, nitrogen is required to carry coating particles into the gun barrel 3 of the spray gun, but the longitudinal speed of the nitrogen is very critical, under the condition that various parameters are unchanged, the speed of the nitrogen is changed to observe the flight track and speed of 40 micrometer particles, and it can be concluded by comparison that the longitudinal spraying speed of the nitrogen carrying particles is about 10m/s, so that the flight track of the particles is concentrated, and the compactness and quality of the coating are positively influenced.
As shown in fig. 6-7, the diameters of the spray particles are different, the flight parameters and flight tracks of the spray gun particles in the spray gun barrel 3 are different, and the speeds and temperatures of the particles with different diameters in the spray gun barrel 3 are obtained through simulation shown in fig. 6 and 7, it can be summarized that the particle diameters are too small, so that the particles have certain following property on flame flow, the speed change is too fast, the particles are easy to heat and the temperature change is too fast, the formation of a coating is not favored, the particle diameters are too large, the flame flow is difficult to accelerate to a larger speed, the temperature is difficult to reach the temperature critical of a molten state, and the formation of the coating is also not favored, so that the particle diameters are optimal between 20 micrometers and 40 micrometers through comparison.
As shown in fig. 8, a simulation diagram showing the supersonic flame spraying process under the optimal spraying condition can be seen from fig. 8 that the velocity of flame flow is extremely increased after passing through the laval throat pipe 2, the velocity and the pressure are relatively reduced, and obvious mach ring phenomenon occurs after being sprayed out of the gun barrel 3, wherein the mach ring is an important mark of the supersonic flame spraying.
The invention can obtain the amorphous alloy coating with high quality and high bonding degree, and can solve the problems of low efficiency of industrial spraying equipment and incapability of well preparing the amorphous alloy coating.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (12)
1. The supersonic flame spray gun is of an integrated structure and comprises a combustion chamber, a Laval throat connected to the tail end of the combustion chamber in a matching way and a spray gun barrel connected to the tail end of the Laval throat in a matching way; the combustion chamber is provided with a fuel inlet, a combustion improver inlet and an ignition plug in a matching way; the method is characterized in that: the fuel inlet is arranged at the right center of the head end part of the combustion chamber in a matching way; the combustion improver inlet is a circle of surrounding combustion improver inlet which is arranged along the circumferential periphery of the fuel inlet and takes the shape of a circular ring; the ratio of the width of the oxidant inlet to the width of the fuel inlet is 1:3.
2. the supersonic flame gun of claim 1, wherein: the length ratio of the inlet section to the outlet section of the Laval throat is 1:4.
3. the supersonic flame gun of claim 1, wherein: the connection part of the Laval pipe and the combustion chamber is provided with a chamfer, and the ratio of the minimum diameter part of the Laval pipe to the diameter of the combustion chamber is 1:3.
4. the supersonic flame gun of claim 1, wherein: the side wall of the gun barrel of the spray gun is provided with a powder feeding port in a matching way.
5. The supersonic flame gun of claim 1, wherein: the aspect ratio of the lance tube was 12.5:1.
6. The supersonic flame gun of claim 1 or 5, wherein: the length of the gun barrel of the spray gun is 150mm, and the width of the gun barrel of the spray gun is 12mm.
7. The supersonic flame gun of claim 1, wherein: the width of the combustion chamber is 24mm.
8. The supersonic flame gun of claim 1, wherein: the ignition plug is arranged on the inner wall of the middle section of the combustion chamber in a matching way.
9. A method for preparing an amorphous alloy coating by a supersonic flame gun, based on any one of the above claims 1 to 8, characterized in that it comprises the following steps:
(1) Propane and oxygen are respectively fed into the combustion chamber through a combustion improver inlet and a fuel inlet of the combustion chamber;
(2) Ignition is performed through an ignition plug on the combustion chamber, so that fuel is fully combusted in the combustion chamber;
(3) The flame flow after combustion passes through a Laval throat to generate supersonic flame flow;
(4) The amorphous alloy powder is sent into the gun barrel of the spray gun through a powder sending port of the gun barrel of the spray gun, and nitrogen is used as powder carrier gas;
(5) The flame flow formed in the step (3) drives amorphous alloy powder to accelerate and heat, and the amorphous alloy powder is sprayed out from a gun barrel of a spray gun;
(6) Powder sprayed from a gun barrel of the spray gun flies in the air and finally collides into the surface of a substrate of a required coating;
(7) Repeating the steps (1) - (6) to finally form the amorphous alloy coating.
10. The method for preparing an amorphous alloy coating by using a supersonic flame gun according to claim 9, wherein: the total mass flow rate of the propane and the oxygen in the step (1) is 16g/s, and the mass ratio is 1:3.
11. the method for preparing an amorphous alloy coating by using a supersonic flame gun according to claim 9, wherein: the amorphous alloy powder adopted in the step (4) is Fe 48 Cr 15 Mo 14 C 15 B 6 Y 2， The particle size of the powder is 20-40 microns, the flow rate of the powder is 1g/s, and the flow rate of the nitrogen is 10g/s.
12. A method of preparing an amorphous alloy coating using a supersonic flame gun according to any one of claims 9-11, wherein: the spraying distance suitable for the method is 300-400mm, the temperature range of the formed supersonic flame flow is 2200-2800K, and the flame flow speed is 1500-2500m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311059639.2A CN117089800A (en) | 2023-08-22 | 2023-08-22 | Supersonic flame gun and method for preparing amorphous alloy coating by using same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311059639.2A CN117089800A (en) | 2023-08-22 | 2023-08-22 | Supersonic flame gun and method for preparing amorphous alloy coating by using same |
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| CN117089800A true CN117089800A (en) | 2023-11-21 |
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| CN202311059639.2A Pending CN117089800A (en) | 2023-08-22 | 2023-08-22 | Supersonic flame gun and method for preparing amorphous alloy coating by using same |
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| Country | Link |
|---|---|
| CN (1) | CN117089800A (en) |
-
2023
- 2023-08-22 CN CN202311059639.2A patent/CN117089800A/en active Pending
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