Silicon Carbide Coating

The core advantages of silicon carbide coating

Silicon carbide (SiC) coatings, with their outstanding comprehensive performance, have become a key surface technology for coping with extreme working conditions and extending the lifespan of components. It can significantly enhance the stability and durability of components in harsh environments such as high temperatures, wear and corrosion. Its core value is mainly reflected in the following aspects:

Super hardness and ultimate wear resistance, directly facing the challenge of high loss: Silicon carbide is an extremely hard material (with a Mohs hardness of 9.2), and the surface hardness of the coating formed through advanced spraying technology can reach HV1800-HV2200, far exceeding traditional metal coatings. It can effectively resist abrasive wear, particle erosion and fretting wear, reducing the wear rate of components by over 90% and extending their service life by several to tens of times. For instance, after the impeller of an industrial centrifugal pump is sprayed, its service life can be extended from several months to 2 to 3 years, significantly reducing downtime and maintenance costs.

Outstanding high-temperature stability and excellent thermal conductivity, fearless of extreme thermal environments: The melting point of silicon carbide is as high as 2700℃, and it can still maintain structural and performance stability at 1600℃, with strong oxidation resistance. With a thermal conductivity of up to 120-170W/(m·K), it is 2 to 3 times that of ordinary ceramic coatings, which can quickly dissipate surface heat, prevent local overheating and protect the substrate. This makes it an ideal choice for high-temperature applications such as aerospace engine components and industrial kiln linings.

Outstanding chemical stability and comprehensive anti-corrosion protection, capable of handling complex corrosive media

Silicon carbide has extremely strong chemical inertness and excellent resistance to most acids, alkalis, salts and organic solvents. The coatings formed by technologies such as plasma spraying are extremely dense (with extremely low porosity), effectively preventing the penetration of corrosive media and providing a perfect physical barrier for the metal substrate. In harsh environments such as chemical engineering and Marine engineering, their anti-corrosion lifespan far exceeds that of traditional coatings.

Good insulation and low friction coefficient expand high-end application scenarios

Silicon carbide coating has excellent electrical insulation performance (volume resistivity 10¹⁴-10¹⁶Ω·cm), and can be used for high-voltage insulation components. At the same time, it combines the advantages of wear resistance and high-temperature resistance. Its relatively low coefficient of friction also helps to reduce the frictional resistance and energy loss of precision mechanical moving parts, enhancing operational smoothness and energy efficiency.

High bonding strength and dense structure lay a reliable foundation for protection

Advanced spraying technology ensures a strong mechanical bond and partial metallurgical bond between the coating and the substrate, with high bonding strength. Meanwhile, the coating itself has an extremely low porosity and a dense structure, fundamentally ensuring the long-term and reliable protective effect.

Significant economic benefits, reducing costs and increasing efficiency for enterprises: Applying silicon carbide coatings to key components is like wearing a strong "golden armor", which can significantly extend their service life by several times or even dozens of times, greatly reducing production losses and maintenance costs caused by frequent shutdowns and component replacements, and bringing long-term considerable investment returns to enterprises.

Specific advantages and applications for different metal components:

For steel/carbon steel components (such as rolls, piston rods, hydraulic rods) :

Advantages: Steel components have low hardness and are prone to wear and rust. By taking advantage of the high-temperature melting property of plasma spraying, a dense and firm silicon carbide coating can be formed on its surface. This "Diamond armor" can withstand the intense friction and high temperature during the rolling process and prevent the hydraulic rods from being scratched and corroded in harsh environments.

Application: Widely used in metallurgical rolls, hydraulic props, offshore platform members, etc., significantly extending their maintenance cycle and service life.

For aluminum alloy/magnesium alloy components (such as aviation structural parts, automotive lightweight parts) :

Advantages: Aluminum and magnesium alloys are lightweight, but they generally have the shortcomings of low hardness and poor wear resistance. By spraying a silicon carbide coating on its key friction areas, it can be endowed with wear resistance comparable to that of high-strength steel without significantly increasing its weight, while also making up for its deficiency in corrosion resistance.

Application: It is used in aircraft engine components, automotive pistons, turbocharger blades, etc., achieving a perfect combination of lightweight and high performance.

For copper and copper alloy components (such as melting crucibles, electrode heads) :

Advantages: Copper parts have good thermal and electrical conductivity, but they are soft and prone to wear and tear, and are prone to oxidation at high temperatures. After spraying the silicon carbide coating, the coating protects the copper substrate from high-temperature melt erosion and oxidation, ensuring its long-term stable thermal conductivity and significantly enhancing its erosion resistance.

Application: Mainly used for protective coatings of graphite/copper crucibles and resistance welding electrodes in the semiconductor industry, enhancing production stability and product yield.

For titanium alloy components (such as aerospace fasteners, medical implants) :

Advantages: Titanium alloys have high strength and corrosion resistance, but they have poor wear resistance and are prone to fretting wear under certain conditions. Silicon carbide coating can effectively isolate friction pairs and solve the wear resistance problem of titanium alloys. In addition, its biocompatibility also makes it have application potential in the medical field.

Application: It is used in the blades of aero engine compressors, artificial joint friction surfaces, etc., to ensure the reliability and safety of key components.

In addition to providing high-quality silicon carbide coating services, Zhengzhou Lijia also has the following highlights in terms of technology and service

Leading spraying technology: Zhengzhou Lijia specializes in two core technologies, plasma spraying and supersonic flame spraying, and has the ability to independently research and develop and manufacture such equipment. Its independently developed supersonic flame spraying system and plasma spraying system. It has been widely applied in the spraying industry at present. The coating quality has reached or even exceeded the standards of similar foreign products, and has received unanimous praise from domestic and foreign customers.

Rich industry application experience: Lijia Company has widely applied these advanced spraying technologies in multiple industries such as aerospace, semiconductors, metallurgy, and papermaking. Whether it is providing thermal barrier protection for high-temperature components through plasma spraying or endowing critical moving parts with ultimate wear resistance through supersonic spraying, we have accumulated successful cases, such as various rollers, hydraulic props, aero engine components, etc.

Meanwhile, Zhengzhou Lijia undertakes various spraying processing and mechanical processing businesses. The company is equipped with lathes, milling machines, drilling machines and grinders, and has been engaged in processing services such as tungsten carbide spraying, stainless steel spraying, ball valve spraying, wire drawing wheel spraying, piston rod spraying, impeller spraying, roller spraying and anti-corrosion all year round. The company has multiple multi-functional spray booths, equipped with various mechanical arms and all kinds of tooling, ensuring excellent coating quality.

Convenient on-site service: For some large-sized and hard-to-disassemble equipment components (such as large papermaking drying cylinders), Lijia can provide on-site spraying processing services. This saves customers the cumbersome disassembly, assembly and transportation processes, effectively reducing downtime costs and improving maintenance efficiency.