Piston rod tungsten carbide spray coating

Introduction to tungsten carbide spraying on piston rod

Tungsten carbide spraying on piston rod is a technique that enhances its wear resistance and hardness by spraying a tungsten carbide coating on the surface of the piston rod. Tungsten carbide has high hardness and wear resistance, which can significantly improve the mechanical strength and wear resistance of piston rods. At the same time, its extremely low friction coefficient also helps to reduce friction between piston rods and cylinders, reduce operating noise and wear.

Characteristics of tungsten carbide.

Tungsten carbide (WC) is a compound composed of tungsten and carbon, which has high hardness, high wear resistance, and good chemical stability. It is insoluble in water, hydrochloric acid, and sulfuric acid, but easily soluble in mixed acids of nitric acid and hydrofluoric acid. Pure tungsten carbide is fragile, but adding small amounts of metals such as cobalt and chromium can reduce brittleness.

Method of spraying tungsten carbide

Spraying tungsten carbide usually adopts supersonic spraying technology. Supersonic spraying technology uses liquid oxygen and aviation kerosene to atomize and ignite in the combustion chamber, forming a high-temperature flame. The powder is then fed into the flame to melt and accelerate the spraying onto the surface of the workpiece. Supersonic spraying technology has the characteristics of wear resistance, corrosion resistance, and high temperature resistance. During the spraying process, there is less heat transfer to the substrate, and the coating has high bonding strength and low porosity.

Application scenarios

Piston rods coated with tungsten carbide are widely used in fields such as petrochemicals, machinery manufacturing, automobiles, and aviation. In the petrochemical industry, piston rods are often used as executive components for oil cylinders and cylinder movements, and their corrosion and wear are common. The use of supersonic spray tungsten carbide technology can effectively improve the anti-corrosion and wear resistance performance. In addition, tungsten carbide spraying is also applied to valve components, pump components, compressors, paper industry rollers, dryers, automotive wear-resistant parts, seals, etc.

Through these technological means, the piston rod sprayed with tungsten carbide can maintain stable operation in harsh environments such as high temperature, high pressure, and high speed, extending the service life of the equipment and reducing maintenance costs.