In automobile manufacturing, commonly used high hardness coating materials include the following categories:

Diamond like carbon (DLC) coating
Characteristic advantages: DLC coating has high hardness (up to Vickers hardness HV2000-3000), low friction coefficient, good chemical stability, and excellent wear resistance. It also has good biocompatibility and can meet corresponding requirements in some special application scenarios.
Application scenario: Widely used in internal components such as piston rings and valve lifters of engines, it can effectively reduce friction between these components, reduce wear, and improve the efficiency and service life of the engine; In the transmission system of automobiles, the use of DLC coating on electronic control couplings, transmission gears, and other parts can also improve the wear resistance of components, ensuring the smoothness and reliability of transmission.
Tungsten carbide (WC) coating
Characteristic advantages: The tungsten carbide coating has extremely high hardness, reaching a Rockwell hardness of around HRC70-85. It also has excellent high temperature resistance and wear resistance, and can maintain good performance in harsh environments such as high temperature, high pressure, and high friction.
Application scenario: Commonly used for key components such as crankshafts and cylinder liners in automotive engines, it can significantly enhance the surface hardness of these components, resist high-temperature wear and mechanical friction generated during engine operation, improve component durability, and ensure stable engine operation; It is also applied to some wear-resistant and impact resistant components in the chassis of automobiles, which helps to improve the chassis' ability to cope with complex road conditions.
ceramic coating
Characteristic advantages: There are various types of ceramic coating materials, such as aluminum oxide (Al ₂ O3), zirconium oxide (ZrO ₂) and other ceramic coatings, which generally have high hardness (the hardness of aluminum oxide coatings can reach about HV1500-2000 Vickers hardness, and the hardness of zirconium oxide coatings is also high), good high temperature resistance, corrosion resistance, and good chemical stability, not easily reacting with external substances.
Application scenario: Applying ceramic coating on the brake disc of a car, with its high hardness and high temperature resistance, can effectively improve the wear resistance and corrosion resistance of the brake disc, making the performance of the brake disc more stable during frequent braking, reducing braking distance, and improving braking safety; Some high-temperature components such as exhaust pipes in cars also use ceramic coatings, which can resist the erosion of high-temperature exhaust and extend the service life of the components.
Titanium nitride (TiN) coating
Characteristic advantages: The titanium nitride coating presents a golden appearance with high hardness (Vickers hardness HV2000 or so), good wear resistance, corrosion resistance, and decorative properties, which can enhance the aesthetics of the components to a certain extent.
Application scenario: Commonly used in automotive wheel hubs and other parts, it can improve the hardness and wear resistance of the wheel hub while also giving it a unique aesthetic effect, meeting the requirements of automotive exterior design; It is also used in some metal parts of car interiors, such as decorative strips, which play a dual role of wear resistance and decoration.
Chromium (Cr) coating
Characteristic advantages: Chromium coating has high hardness (Rockwell hardness HRC60-70), excellent corrosion resistance, wear resistance, and good decorative properties, which can provide good protection for the substrate material.
Application scenario: Some exposed metal parts of automobiles, such as door handles, bumpers, etc., are coated with chromium, which can enhance the surface hardness of the parts, resist daily scratches and wear, and improve the appearance of the parts, keeping them bright and tidy and extending their service life.
These high hardness coating materials, with their unique performance advantages, play an important role in different parts of automobile manufacturing, improving the performance, appearance, and service life of automobiles.

Room termperature curing polysilazane, pls check IOTA 9150, IOTA 9150K. 
High termperature curing polysilazane, pls check IOTA 9108, IOTA 9118.