Tungsten carbide has many advantages as a coating and is an important material for preparing high wear-resistant coatings. It has high hardness, especially its extremely high thermal hardness, and can be well wetted by metal melts. These excellent properties make tungsten carbide coatings have excellent wear resistance.
Tungsten carbide is also resistant to atmospheric and chemical corrosion. It can effectively resist long-term steam corrosion and various chemical corrosions, such as acidic, alkaline, and salt corrosion.
Supersonic plasma spraying technology is an important surface engineering technology. Compared with other spraying technologies, it has a high deposition rate of sprayed materials, high production efficiency, low energy consumption, low overall spraying cost, and good coating quality (performance It is a spraying technology with advantages such as dense coating, high bonding strength, superior wear resistance, and erosion resistance. It is a high-efficiency spraying technology with broad application prospects in industry, national defense, aerospace, and other fields. It can effectively extend the life of the workpiece. Its spraying speed can reach more than 400-800m/s.
Supersonic plasma spraying is a thermal spraying technology that uses a rigid, non-transferable plasma arc as the heat source to heat the working gas to form a high-temperature and high-speed plasma jet (temperature can reach tens of thousands of degrees Celsius), thereby removing the refractory particles sent into the jet. Materials such as metals, carbide ceramics, and oxide ceramics, such as tungsten carbide (WC), are heated and accelerated to form a molten particle flow, which hits the substrate surface at high speed to form a coating, for example, tungsten carbide coating - a coating with the second-hardest A high-hardness wear-resistant coating based on diamonds.
This technology has been widely used in military equipment, metallurgical machinery, transportation vehicles, ship manufacturing and maintenance, and other fields. It can meet the high requirements for coatings in these fields, especially in cutting-edge fields—high melting point, high purity, and high strength.
For example. Researchers have used supersonic plasma spraying technology to improve the service life of oil drill pipes. Tungsten carbide (WC) coating is a coating material with high hardness and excellent anti-wear properties. It can be used for wear-resistant protection of material surfaces and can also be used to repair damaged equipment parts, thereby saving a lot of money. Expensive materials and processing fees. Usually, in order to further improve the corrosion resistance and wear resistance of WC coating, a certain proportion of alloying elements, such as Co, Cr, B, Si, Ni, etc., are added to it. WC10Co4Cr is used as a protective coating for oil drill pipes because of its excellent corrosion resistance and high high-cycle fatigue performance.
The heat source for plasma spraying consists of a tungsten cathode containing thorium dioxide or cerium and a hollow copper anode that generates an electric arc. The cathode and anode are placed on the same axis in the spray gun and are cooled by continuously flowing water. A DC cable supplies the cooling water. The plasma gas and powder are connected to the spray gun via hoses. A DC arc is generated between the nozzle (anode) and the cathode. The working gas enters between the nozzle and the cathode from the gas distribution ring. Under the action of the DC arc, the gas is ionized and compressed to produce a high-temperature plasma jet from the nozzle. The powder to be sprayed is suspended in the carrier gas flow and enters the plasma flame from the powder-feeding port. The powder is heated and accelerated by the plasma jet and is sprayed toward the substrate in a molten or nearly molten state. The particles collide with the substrate, flatten, and bond to the substrate. Layers are built up to form a coating.
The answer is yes, and it is used in many places, far exceeding its applications in other fields. Because the flying speed of a supersonic aircraft is at least five times the speed of sound, that is a speed above Mach 5. What does this speed of movement mean? This means that the surface of the aircraft will generate ultra-high temperatures of up to 2000-3000°C, and the surface parts of the aircraft fuselage will be damaged by air damage caused by high pressure and structural parts caused by friction. Therefore, coating materials and spraying technology are both necessary. Among them, coating materials are one of the "dilemmas" that countries currently encounter when researching supersonic aircraft.
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