[Coating Preparation] Erosion-Resistant Coating

[Coating Preparation] Erosion-Resistant Coating To achieve an ideal sealing condition between the blades and the casing of high-speed rotating machinery (such as compressors and gas turbines) and thereby maximize the hydrodynamic pressure differential, erosion-resistant coating technology can be employed to enhance overall machine efficiency, reduce energy consumption, and extend service life.

Tungsten Carbide Wear-Resistant Coating for Spiral Shafts

Tungsten carbide wear-repair machining for impeller blade coating

Description: Our company provides repair services for worn areas on fan impellers in cement plants, power plants, and other facilities, as well as surface reinforcement coatings for new impellers. These services can extend the service life of impellers by several times. We employ a supersonic thermal spraying tungsten carbide repair solution, which produces a dense coating with high hardness and excellent wear resistance, thereby significantly prolonging the service life of the components. Carbon

Wear-resistant coating for feeding tubes in lithium-ion battery equipment

1. Currently widely used in the lithium-battery slurry industry, this coating is suitable for various types of lithium-battery equipment, including dispersion disks, screw shafts and spiral mixers, wear-resistant components for pulverizers, tanks, cylindrical bodies, conical hoppers, powder-handling machines, feeding systems, electrode manufacturing equipment, and wear-resistant coatings. 2. The tungsten carbide coating achieves a hardness of HRC75 or higher—second only to diamond among ultra-hard, wear-resistant coatings—effectively preventing metal ions from entering the powder and thus avoiding metal contamination of the powder caused by material wear. 3. Guangzhou Sanxin utilizes American Plasmax supersonic spraying equipment and imports tungsten carbide materials. This tungsten carbide coating is particularly well-suited for applications involving particle abrasion. 4. During coating application, the workpiece temperature does not exceed 150 degrees Celsius, ensuring no deformation occurs in the workpiece. 5. The coating has a surface roughness of R3.2 or lower, with a controllable coating thickness ranging from 0.10 to 0.35 mm. After pore-sealing treatment, the coating does not react with NMP. 6. Depending on the specific service environment, you can choose between wear-resistant and corrosion-resistant coatings.

Ball valves, ash valves, and valve plates coated with tungsten carbide.

Spherical hardening treatment, wear-resistant coating for valve internal cavities, hard-sealed ball valves, coal ash valves, and tungsten carbide valve discs—our company employs advanced supersonic flame spraying technology to apply ultra-wear-resistant tungsten carbide coatings to various components.

Tungsten carbide wear-resistant coating applied by dispersion disk spraying

Lithium equipment-specific isolation layer, tungsten carbide wear-resistant coating sprayed onto the dispersion disc surface—tungsten carbide wear-resistant.

Supersonic Arc Spraying of Converter Smoke Hoods and Flues

Supersonic Arc Spraying for Converter Tundish and Flue Ducts After Spraying the Movable Tundish After Spraying the Lower Tundish Regarding Converter Tundishes and Flues: A converter tundish, also known as a converter waste heat recovery device, typically consists of a movable tundish, a furnace outlet flue, and a final-stage flue. During the blowing process, the movable tundish descends to prevent air from entering and mixing with the combustion gases, while simultaneously collecting the high-temperature flue gas. Both the movable tundish and the final-stage flue have large heat-transfer surfaces designed to reduce the temperature of the flue gas. Generally, these heat-transfer surfaces are made up of 20 layers of low-carbon steel tubes. The flue gas generated during steelmaking can reach temperatures as high as 1100–1400°C, with peaks up to 1600°C, and contains sulfur and its compounds, as well as substantial amounts of dust such as high-temperature slag and lime. As a result, the heat-transfer surfaces are subjected to erosion by solid particles, corrosion from acidic gases, and high-temperature oxidation. Splashed high-temperature slag easily adheres to the heat-transfer surfaces, causing severe high-temperature erosion and slag buildup. Over time, both the tundish and flue operate continuously under these harsh conditions, facing an extremely challenging working environment. In particular, their heat-transfer surfaces endure corrosive effects from sulfur-containing gases, high-temperature oxidation, and erosive wear, making them highly susceptible to developing numerous bamboo-like thermal fatigue cracks, pitting, and even perforations that lead to water leakage in the water-cooled tubes—conditions that significantly impact steelmaking production efficiency. The Role of Thermal Spraying in Tundish Protection: Although there are many thermal spraying techniques available, arc supersonic spraying—a method developed in recent years—has undoubtedly become the best approach for tundish protection. Its advantages include: 1) low cost and high efficiency; 2) superior bonding strength compared to other spraying methods; 3) the ability to add ceramic powders to the wire feed, thereby enhancing resistance to erosive wear. While thermal spray welding offers excellent protective performance, it is more difficult to implement, costly, and prone to deformation. Based on extensive domestic and international experience, we have developed a three-layer composite arc supersonic spray coating. Application tests on tundishes and power plant boilers have demonstrated that this coating can extend the service life of these components to over three years.

Wear-resistant coating for electrode roller

Tungsten Carbide Coating for Electrode Rollers: The typical manufacturing process for lithium-ion battery electrodes involves mixing active materials, binders, and conductive agents to form a slurry, which is then coated onto both sides of copper or aluminum current collectors. After drying, the solvent is removed, resulting in electrode sheets. The particle coating on these electrode sheets is subsequently compacted and densified through rolling, followed by cutting or slitting into individual strips. Rolling is the most commonly used compaction technique for lithium-battery electrodes. Compared to other compaction methods, rolling significantly alters the pore structure of the electrode sheets and also affects the distribution of conductive agents, thereby influencing the electrochemical performance of the battery. To achieve an optimized pore structure, it is crucial to have a thorough understanding of the rolling compaction process. Figure 1 illustrates the basic process of electrode rolling. Materials—Equipment—Processes—Solutions: We have accumulated extensive experience in coating applications and are currently replicating these successful cases. We will guide you through the entire coating-manufacturing transition process, ensuring: rapid production start-up; a reliable supply solution covering materials, equipment, and processes all in one package; coating trials conducted either at your site or at our technology center; and consistently high coating quality and efficiency.

Automotive mold spraying with tungsten carbide

Molds—especially hot-work molds—not only operate under high-temperature conditions but also endure wear, compression, impact, and thermal-mechanical fatigue. Consequently, their surface properties are typically subject to stringent requirements. If the surface lacks sufficient hardness, red hardness, oxidation resistance, or corrosion resistance, it is prone to damage during use, thereby shortening the mold’s service life. Therefore, mold surfaces generally undergo surface enhancement treatments. Once a mold surface is scratched, as long as the damage is not severe, it can be repaired, thus extending the mold’s service life. Thermal spraying technology boasts several advantages in surface enhancement and component repair processes: flexible and diverse process methods, a wide range of material choices, convenient and rapid construction, strong adaptability, remarkable repair and enhancement effects, and high economic benefits. This technology is particularly well-suited for large-scale molds and molds operating under severe wear conditions. Among the commonly used techniques for mold surface enhancement and repair are plasma spraying and supersonic spraying. By employing supersonic flame spraying, tungsten carbide coatings can be applied, significantly improving the mold’s surface hardness, wear resistance, and corrosion resistance. The key performance indicators of tungsten carbide coatings are as follows: A. Coating hardness: HV1150 or higher. B. Bonding strength: 68 MPa or higher. C. Porosity: Less than 1%. D. Oxide content: Less than 3%. E. Service environment: Below 250℃, in environments without severe impacts. F. Service life: More than six times that of conventionally heat-treated surfaces.