Preparation of high temperature radiation coating: special metal oxides

       Characteristics of coating preparation:

1. The flame velocity is very high, generally 5 times the speed of sound.

2. The speed of spraying powder is also very high, up to 2000 m/s.

3. The coating is highly dense, the bonding strength is high, the porosity can be less than 1%, and the bonding strength can be greater than 70Mpa.

4. The coating material has a low degree of oxidation. Less carbon loss and high coating hardness.

5. The powder particles have obtained great kinetic energy in the high-speed flame flow, and the impact effect on the substrate and the deposited particles is significant. Beijing Qinhe Technology Co., Ltd.



And only a small part of the deposited particles have liquid/solid phase solidification and shrinkage process, most of them are solid phase

    Deformation, compressive stress is generated in the coating which is helpful to improve the reliability of the coating

6. Some specific materials can meet repair occasions, Beijing Qinhe Technology.

7. High-speed impact and strong deformation cause distortion of the material's crystal lattice, increase the activity of the material, and thus increase

    It is possible to form a physical bond with adjacent particles or matrix materials, and the reliability of the coating is extremely high.

8. The workpiece is not deformed.

application:

1. Sealing coating: The use of composite powder and spraying soft abradable sealing coating on the substrate is a high-temperature sealing and void technology that has rapidly developed in the aviation and aerospace industries. It is an important application of modern thermal spray coatings. The use of abradable coatings in the contact movement of the mating parts can automatically form the necessary gaps for the mating parts and provide the best sealing state. At present, high-tech abradable coating materials are composed of a mixture of two powders or agglomerated powders, which are prepared by flame or plasma spraying methods. Generally speaking, the abradable coating is composed of a metal body and a non-metallic filler. The filler is usually graphite, polyester, boron nitride, etc. The function of the filler is to weaken the integrity of the coating itself, thereby enhancing the abradability of the coating. At present, a series of spray abradable coating materials have been developed. These coatings are used in the air sealing part of the surface, the compressor or the permeability A good sealing effect is obtained between the flat blade and the metal surface structure or casing. The abradable coating can also be used for labyrinth seals. The coating is used to divert the cooling air, reduce the loss of engine compressed air, and maintain the rotor shaft The pressure balance.

2. Turbine impeller: spraying the flow parts of the turbine, repairing and spraying according to customer requirements, applying HVOF spraying treatment to the parts of hydropower stations in the Yellow River and Yangtze River basins that have long suffered from sediment wear and cavitation, which significantly prolongs the service life of the flow parts. The power plant improves economic efficiency and makes it wear armor, so there is no fear of mud and sand. Fully adopted imported thermal spraying equipment and spraying materials, performing the most stringent quality inspections, devoting themselves to building a first-class brand, and providing quality services to users.

3. Brake pads: The brake pads of automobiles and motorcycles need to be sprayed with a layer of friction material. This layer of friction material can make the brake pads of automobiles and motorcycles longer life and better effect, and reduce noise during braking.

4. Etching machine: An extremely important link in the production process. The chamber of the etching machine is eroded by plasma and becomes invalid during the etching process. It needs to be resprayed regularly to replace hard chrome plating: as a kind of The technology that pollutes the environment is facing an end in China today. This is no exaggeration. In the next ten years, the way to consider the performance of local government officials is to walk, look, and hear about the river. The pollution of the water in the area under its jurisdiction will become a shame in China in the future. So where is the way out? The way out is thermal spraying. Globally, supersonic flame spraying is considered to be the best alternative to hard chrome plating, although it cannot be completely replaced. Plasma spraying is also used to replace chrome plating of certain parts. For large parts, such as hydraulic rods of construction machinery, it is relatively easy to replace chromium plating with thermal spraying, just spray the coating and then polish it.

6. Coal machine hydraulic rod: originally used surface chromium plating treatment, but the chromium plating process will seriously pollute the environment and will be strictly controlled by the state. Therefore, various coal machine hydraulic rod manufacturers have begun to adopt laser cladding technology, but laser cladding technology has low processing efficiency and processing The process is cumbersome and it is difficult to realize automated production, so it is urgent to break through the technical bottleneck.

7. Insulated bearings: We use thermal spray insulation coatings, which have been successfully applied on high-speed railways.

8. Thermocouple protective cover:

9. Hydraulic plunger:

10. Wire drawing tower wheel and wheel hub: The treated tower wheel will wear more than 10 times longer than the untreated one.

11. Paper drying cylinder: We have 5 sets of movable spraying equipment, which can respond to the needs of customers at any time and carry out spraying processing at the customer's place.