The development trend of thermal spraying technology, how about thermal spraying technology?

Can there be a reliable point?。。

Hello 1The adhesion between the thermal spray coating and the base metal is dominated by mechanical bonding, so the impact resistance of the coating is not high. 2.

Thermal spraying coating has a certain porosity, and other means, such as external sealing coating, must be taken to form a coating structure in order to play a better corrosion protection function.

Thermal spraying includes flame spraying, arc spraying, plasma spraying, ** spraying and supersonic flame spraying, their common feature is to use arc, flame, plasma or laser as the heat source, heat the powder to a melted or semi-melted state, and then bond the molten droplets to the surface of the workpiece to form a coating. As a result, there is oxidation, phase change, decarburization or alteration of the physical and chemical properties of the original powder during the thermal spraying process.

and other problems, and at the same time, it will have an adverse thermal effect on the substrate. Lianyi Electromechanical, and the cold spraying process because the powder particles are deposited at a lower temperature, compared with thermal spraying, the biggest advantage is that the spraying working temperature is much lower than all thermal spraying processes, so it has many advantages.

Since cold spraying is the deposition of high-speed moving powder particles onto the substrate, it has many advantages while also has its own disadvantages:

1.It is difficult to deposit coatings of brittle materials, including brittle ceramic materials.

and brittle metal materials cannot be coated by cold spraying.

2.When spraying certain powder particles, the most expensive HE must be used as the carrying working gas to obtain a high-quality coating.

3.Cold spray cannot be diffracted by spray.

It is not possible to paint the surface of parts with complex shapes.

There are many technical characteristics of thermal spraying, which are briefly listed with you below.

1. The base material is not restricted, it can be metal and non-metal, and can be sprayed on various base materials;

2. The coating materials that can be sprayed are extremely extensive, and the thermal spraying technology can be used to spray almost all solid engineering materials, such as cemented carbide, ceramics, metals, graphite, etc.;

3. The temperature rise of the matrix material is small during the spraying process, and there is no stress and deformation;

4. The operation process is flexible and convenient, not limited by the shape of the workpiece, and the construction is convenient;

5. The coating thickness can be from a few millimeters or a dozen millimeters;

6. The coating has a variety of properties, which can form a coating with various special functions such as wear resistance, corrosion resistance, heat insulation, oxidation resistance, insulation, electrical conductivity, radiation protection, etc.;

7. Strong adaptability and good economic benefits.

1. The equipment is light and can be constructed on site.

2. The process is flexible and the operation procedures are few. It can be repaired quickly and reduces processing time.

3. Strong adaptability, generally not limited by the size of the workpiece and the site.

4. The thickness of the coating can be controlled.

5. In addition to spray welding, the heating temperature of the substrate is low, the deformation of the workpiece is small, and the metallographic structure and performance changes are also small.

6. It is suitable for parts of various matrix materials, and various protective coatings and functional coatings can be prepared on almost all solid material surfaces. From the analysis of the principle and process of thermal spraying technology, thermal spraying technology has the following characteristics.

Due to the wide temperature range of the heat source, the coating materials that can be sprayed include almost all solid engineering materials, such as metals, alloys, ceramics, cermets, plastics, and the compounds composed of them. Therefore, it can give the substrate a surface with various functions (such as abrasion resistance, corrosion resistance, high temperature resistance, oxidation resistance, insulation, heat insulation, biocompatibility, infrared absorption, etc.).

The degree of heating on the surface of the substrate during the spraying process is small and controllable, so it can be sprayed on various materials (such as metal, ceramic, glass, cloth, paper, plastic, etc.), and has almost no effect on the structure and properties of the substrate, and the workpiece deformation is also small.

The equipment is simple and flexible in operation, which can not only spray large components in a large area, but also spray in a specified area; It can be sprayed indoors in the factory or applied outdoors on site.

There are fewer procedures for spraying operations, shorter construction time, high efficiency, and more economical. With the improvement of thermal spraying application requirements and the expansion of the field, especially the progress of spraying technology itself, such as the increasing high energy and sophistication of spraying equipment, the gradual increase of coating material varieties, and the gradual improvement of performance, thermal spraying technology has achieved rapid development in the past ten years, not only the application field has been greatly expanded, but also the technology has developed from the early preparation of general protective coatings to the preparation of various functional coatings; From the maintenance of a single workpiece to the manufacture of a large number of products; From a single coating preparation to a coating system engineering including product failure analysis, surface pretreatment, development and selection of coating materials and equipment, coating system design and post-coating processing; It has become a very active discipline in the field of material surface science. And in modern industry, independent material processing technologies such as casting, forging, welding and heat treatment are gradually formed.

It has become an important technological means for the industrial sector to save precious materials, save energy, improve product quality, extend product service life, reduce costs and improve work efficiency, and has been more and more widely used in various fields of the national economy.

Combined with many years of construction experience, Hebei CITIC Anti-corrosion Engineering Co., Ltd. has found that metal thermal spraying has the following advantages:

1. The coating materials that can be sprayed have a wide range, including various metals and alloys, ceramics and cermets, plastics, non-metallic minerals and almost all solid and stuffy engineering materials. Therefore, it can prepare various functional coatings such as wear resistance, friction reduction, corrosion resistance, high temperature resistance, oxidation resistance, insulation, electrical conductivity, catalysis, radiation, radiation protection, anti-interference, superconductivity, amorphous and biological functions.

2. It can form coatings on a variety of substrate materials, including metal substrates, ceramic substrates, plastic substrates, wood and even cardboard.

3. Generally, it is not limited by the size, shape and construction site of the workpiece to be sprayed, and can be sprayed on the entire surface, but also sprayed on the limited surface of large components, which can be used for in-plant construction and on-site construction.

4. The coating deposition efficiency is high, especially suitable for deposition of thin film coatings. The coating thickness can be controlled and can vary over a wide range, from tens of microns to a few millimeters and even up to 20 mm thick

5. In addition to spray welding, the thermal spraying construction has little thermal impact on the substrate, and the heating temperature of the substrate does not exceed 200, and the substrate will not be deformed and the performance will change.

6. Under the premise of meeting the strength requirements, the base body of the workpiece can be replaced by ordinary materials instead of precious materials, and only high-quality materials are used for coating, so that "good steel is used on the blade of the knife", and it can also be sprayed and formed.

7. The thermal spraying process is flexible, convenient, fast and adaptable.

The development of automatic spraying equipment in China has experienced the development process from manual to production line and automatic production line, and the coating process can be simply summarized as; Pre-treatment, spraying, drying or curing, three waste treatment. China's coating industry really originated in the 50s of the last century after the introduction of Soviet technology, some aid projects began to establish a coating production line, but these automatic painting machines are generally a combination of steel plate welding groove and steel structure spraying (coating) paint room and drying room (furnace), by the electric hoist manual hanging workpiece (a few with hanging conveyor) operation.

Nowadays, the society and industry are developed, all walks of life are developing, and the world industry is already mechanized. At the same time of the rapid development of the industry, the use of spraying equipment is becoming more and more extensive, and the spraying equipment is gradually moving towards the road of environmental protection, and the spraying equipment will be more environmentally friendly in the future to reduce the emission of exhaust gas.

At present, it is in the stage of learning and absorbing foreign technology, and the equipment of the entire industry belongs to the three no products (no industry standards, no national standards, and no market access standards). The main problem involved is that the design structure is unreasonable and the scientific and technological content is not high.

Embodiment of unreasonable structure:

1. The air volume design of the air supply system and exhaust system equipment is unreasonable.

2. The workmanship is rough, and the workmanship of the fine parts is poor or even not done.

3. Do not design according to spraying materials and coatings.

4. Spraying equipment manufacturers are uneven. Each in its own right.

The embodiment of low technology content:

1. The degree of automation is not high.

2. The equipment is rigid and cannot be used flexibly.

3. There is no design supporting waste gas and wastewater treatment project.

4. Poor selection of fireproof materials and potential safety hazards.

5. The overall operation of the equipment is prone to problems.

6. It is difficult and inconvenient to replace and maintain.

Spraying equipment generally includes:

1. Air compressor (air compressor) 2, air pipe 3, joint 4, valve 5, triple piece 6, air motor 7, air mixer 8, air diaphragm pump 9, airless spraying 10, spray gun 11, silencer 12, pressure barrel 13, fan.

Thermal spraying. It's one of a kind.

Surface. Reinforcement technology, yes.

Surface engineering technology.

It has always been a key part of China's promotion.

Technology. Project. It is the use of some kind of heat source (e.g., electric arc,

Plasma arc. or burning flames, etc.) will be powder unformed or filamentous. Metal. Or.

Non-metallic materials.

Heat to a molten or semi-molten state, and then with the help of a flame to stay itself or.

Pressurized air. Spray at a certain speed to the pre-treated.

Matrix. surface, formed by deposition with a variety of functions.

Surface coating. a technology.

This is in. High-velocity airflow.

Under the action of atomizing it into fine melt droplets or.

High temperature. Grain.

Spray at a very high flight speed to the treated one.

The surface of the workpiece. form a firm.

Overlay. So that the surface of the workpiece gets a good bird differently.

Hardness. Abrasion resistance, corrosion resistance, heat resistance, oxidation resistance, heat insulation, insulation, electrical conductivity, sealing, disinfection, prevention.

Microwave radiation. and various other special physical and chemical properties. It can repair the old and reuse the waste in the maintenance of equipment, so that the scrapped parts "come back to life"; It is also possible to do so.

New products. Strengthened and pre-protected in manufacturing to make it "longevity".

Spray coating. Powder.

It occupies a very important position in the whole thermal spray material. Hot spray socks are applied.

Alloy powder. Includes nickel-based, iron-based, and.

Cobalt-based alloys. powder, press differently.

Coating. hardness, respectively, applied to:

Machine. Repair and protection of spare parts.

Thermal spraying technology features:

1. The matrix material is not restricted, it can be metal and.

Nonmetal. Can be sprayed on a variety of substrate materials;

2. The coating materials that can be sprayed are extremely extensive, and the thermal spraying technology is very wide.

It can be used to spray almost anything.

Solid. Engineered materials.

Such as cemented carbide

Ceramics. metals, graphite, etc.;

3. Spraying. Process.

The temperature rise of the medium matrix material is small, and there is no stress and deformation;

4. Operation. Craft.

Flexible and convenient, not subject to.

Workpiece. Shape.

restricted, easy to construct;

5. Coating. Thickness.

It can be from up to a few millimeters;

6. The coating properties are varied, and it can form a coating with various special functions such as wear resistance, corrosion resistance, heat insulation, oxidation resistance, insulation, electrical conductivity, radiation protection, etc.;

7. Strong adaptability and good economic benefits.

Merit. Commonly used thermal spraying methods:

Flame spraying. Oxyethylene.

Flame powder coating.

Oxyethylene flame. Wire rod.

Spraying, oxyethylene flame spray welding, high-speed flame spraying (HOVF) cavity early, arc spraying, plasma spraying.

Atmospheric plasma spraying

Low voltage. Plasma spraying.