Principle:
In a vacuum chamber, gas ions generated by glow discharge (such as Ar⁺) are accelerated by an electric field to bombard a solid target material. The target atoms are ejected through this impact process and deposited onto the substrate to form a thin film. To improve efficiency, a magnetic field is applied behind the target to confine electrons near the target surface, greatly increasing the collision probability with gas molecules.

Principle:
By utilizing arc discharge, one or multiple tiny cathode spots with extremely high energy density are generated on the target surface. The target material is instantaneously melted, vaporized, and highly ionized, forming a high-energy ion stream that deposits onto the substrate under negative bias voltage.

Principle:
Under vacuum conditions, source materials are vaporized through heating methods such as resistance heating, electron beam bombardment, or laser heating. The vaporized atoms or molecules travel linearly to the substrate surface and condense into a thin film.

Definition:
DLC (Diamond-Like Carbon) refers to a broad class of amorphous carbon films with properties similar to diamond. Its core component is carbon, consisting of a mixed bonding structure of sp³ (diamond-like) and sp² (graphite-like) bonds.

DLC and Ta-C (Tetrahedral Amorphous Carbon) are not independent PVD technologies parallel to magnetron sputtering or cathodic arc deposition. Instead, they are specific thin-film materials that can be produced using one or more of the deposition technologies mentioned above.

Simply put, DLC and Ta-C can be understood as the “products” being manufactured, while technologies such as magnetron sputtering, cathodic arc deposition, and evaporation coating are different “production methods.” For example, Ta-C coatings can be prepared using PVD technologies such as Laser-Arc deposition.

Deposition Technologies:
Can be prepared using magnetron sputtering or various non-PVD methods.

Characteristics:
High hardness, ultra-low friction coefficient, excellent wear resistance, high chemical inertness, and outstanding biocompatibility.

Applications:
Suitable for engine components, injection molds, precision bearings, razor blades, medical devices, hard disk head protection, and more.

Advanced Development:
Current research focuses on achieving ultra-low friction (friction coefficient <0.01) to improve energy efficiency, while element doping (such as Si and F) is being explored to enhance performance under different operating environments.

Definition:
Ta-C (Tetrahedral Amorphous Carbon) represents the highest-performance category within the DLC family. Its defining feature is an extremely high sp³ carbon bond content (typically above 80%), resulting in hardness and wear resistance far superior to conventional DLC coatings.

Like DLC, Ta-C is not an independent PVD technology parallel to magnetron sputtering or cathodic arc deposition, but rather a specific thin-film material produced through one or more advanced deposition technologies.

Deposition Technologies:
Requires high-energy and highly ionized deposition techniques. Laser-Arc deposition is currently one of the most successful and widely adopted industrial methods.

Characteristics:
Extremely high hardness (up to 70 GPa or 7000 HV), ultra-low friction coefficient (below 0.01 with lubrication), exceptional wear resistance, and extremely low deposition temperature (<100°C), enabling coating on plastic substrates.

Applications:
Used in high-performance cutting tools (especially for dry cutting), precision molds, oil-free bearings, gear transmission systems, and precision mechanical components requiring extreme wear resistance.

Advanced Development:
Current research directions include achieving nearly defect-free coatings through next-generation plasma filtering systems, transferring superlubricity from laboratory research to real engineering applications, and combining Ta-C with solid lubricants such as MoS₂ to withstand even harsher operating conditions.