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Application of Tungsten Carbide Coatings in the Lithium-Ion Battery Industry
Release time:
2020-09-01 10:45
Source:
Tungsten carbide is a compound composed of tungsten and carbon. It appears as black hexagonal crystals with a metallic luster, exhibiting a hardness comparable to that of diamond and serving as an excellent conductor of electricity and heat. Tungsten carbide is insoluble in water, hydrochloric acid, and sulfuric acid, but readily dissolves in a mixed acid consisting of nitric acid and hydrofluoric acid. Pure tungsten carbide is brittle; however, by adding small amounts of metals such as titanium and cobalt, its brittleness can be reduced. Tungsten carbide used in steel-cutting tools is often alloyed with titanium carbide, tantalum carbide, or mixtures thereof to enhance its resistance to fracture. Tungsten carbide exhibits chemically stable properties. Tungsten carbide powder is employed as a raw material in the production of cemented carbides.
Tungsten carbide powder (WC) is the primary raw material used in the production of cemented carbides. Its chemical formula is WC. Known fully as Wolfram Carbide, it is also referred to as tungsten carbide. It appears as black hexagonal crystals with a metallic luster. Its hardness is comparable to that of diamond, and it is an excellent conductor of electricity and heat. Its melting point is 2870°C, its boiling point is 6000°C, and its relative density is 15.63 (at 18°C).
After years of practical experience in the battery industry, our company has developed comprehensive solutions for isolating iron ions and enhancing wear resistance in cathode materials and battery production equipment, thereby significantly reducing impurity introduction. Moreover, these solutions have greatly improved the self-discharge performance of finished batteries once the cathode materials are processed into end products.
During the production of battery materials, contact with iron-containing components must be strictly avoided. Many companies use stainless steel screws in conical and cylindrical mixers; however, as battery powders are continuously rubbed against the mixer’s inner walls during the mixing process, both the mixer walls and the screws will suffer significant wear over time. The worn stainless steel particles end up mixed into the battery powder. Since stainless steel contains up to 70% iron, this contamination poses a serious threat to the quality of the battery powder.
Our company employs an integral tungsten carbide treatment on all parts of the high-speed mixer—such as the impellers and tank—that come into contact with the cathode material. This treatment ensures that the tungsten carbide layer will never flake off, providing long-lasting durability. By applying this comprehensive treatment to the high-speed mixer (including both the impellers and the tank), we have effectively eliminated the introduction of elemental impurities—such as boron, silicon, and sodium—from the fiberglass coating previously used in cathode materials. Furthermore, after treating the stirring blades of battery slurry preparation equipment, we’ve significantly reduced the introduction of impurities caused by stainless steel wear, thereby greatly lowering the self-discharge rate of batteries.
Relevant Information
The complete set of plasma-sprayed equipment has been shipped to the customer’s site in Thailand.
Core spraying equipment: SX-80 plasma spray main unit, with a 15,000℃ flame suitable for multiple materials including zirconia and silicon carbide; powder feeding accuracy of ±1%, and coating thickness tolerance ≤ ±5 μm. Environmental protection support system: Customized soundproof booth + pulse dust collector—effectively addressing spray noise pollution while achieving highly efficient dust recovery, compliant with Thai environmental standards. Automated equipment: 6-axis industrial robot + intelligent spray cart, enabling precise spraying of complex workpieces and automated loading/unloading, boosting production efficiency by 40%.
On-site engineers provide hands-on training, focusing on the core operations of plasma spraying equipment such as the SX-80. Sanxin has customized a complete solution for its customers, including an automated spraying robotic arm, a soundproof booth, and a dust removal system—ensuring both high spraying efficiency and compliance with environmental standards.
Guangzhou Sanxin Thermal Spraying Turntable Shipment
Guangzhou Sanxin Company manufactures single-station and multi-station thermal spray turntables, which can be paired with plasma equipment, supersonic equipment, and arc equipment. We offer rapid, customized production tailored to customer requirements and product dimensions. A thermal spray turntable is a high-precision rotary worktable specifically designed for thermal spraying processes—including flame spraying, plasma spraying, and arc spraying. By providing controllable rotational speed and exceptional stability, it ensures uniform coating thickness on the workpiece surface, thereby enhancing spraying efficiency and quality.
SX-80 plasma equipment is being used at a customer site in Russia.
SX-80 plasma equipment is being used at a customer site in Russia.
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