Diamond-Like Carbon Coating (DLC) | PVD Surface Finishing China – JLY Precision Tech

Diamond-Like Carbon Coating (DLC) by JLY Precision Tech boosts hardness to 3000 HV and cuts friction to 0.05. Get REACH-compliant PVD DLC services in China with no MOQ. Quote in 48 h.

July 14, 2025

Diamond-Like Carbon Coating (DLC) – The New Standard for Extreme Surface Finishing

Diamond-Like Carbon Coating (DLC) is rapidly becoming the go-to solution for engineers who need ultra-low friction, exceptional hardness, and chemical inertness in one thin film. At JLY Precision Tech, we deposit hydrogen-free (ta-C) and hydrogenated (a-C:H) DLC layers via cathodic-arc PVD, delivering repeatable quality from prototype to high-volume runs.

Why Diamond-Like Carbon Coating (DLC) Beats Traditional Finishes

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Property	Hard Chrome	Electroless Ni-P	TiN PVD	DLC (ta-C)
Thickness (µm)	5–100	5–50	1–5	0.5–4
Hardness (HV)	800–1 100	500–700	1 800–2 000	2 500–3 000
Friction vs. steel (dry)	0.25	0.3	0.4	0.05–0.15
Salt-spray (h)	48	96	200	1 000+
REACH compliance	Restricted	OK	OK	OK

Diamond-Like Carbon Coating (DLC) Process Flow in Shenzhen

Plasma etch – removes oxides and micro-roughens the surface
Bond layer – 50 nm Cr or CrN for adhesion on steel, Ti, Al
DLC deposition – arc-evaporated graphite at 200 °C
Post-polish – optional CMP to Ra ≤ 0.02 µm

Diamond-Like Carbon Coating (DLC) in Action – 3 Case Studies

Case Study 1 – High-Pressure Diesel Piston

Client: Tier-1 EU OEM
Issue: Galling at 2 500 bar
DLC Solution: 2 µm ta-C + Cr interlayer
Result: Zero seizure after 1 000 h; torque down 22 %

Case Study 2 – Ophthalmic Scalpel

Client: Japan Med Device Start-up
Issue: 30 µm edge retention
DLC Solution: 500 nm a-C:H on martensitic stainless
Result: Edge radius growth < 5 µm; CE-marked product

Case Study 3 – CNC Router Linear Rails

Client: US Woodworking OEM
Issue: Abrasive MDF dust
DLC Solution: 1.2 µm ta-C + burnish Ra 0.04 µm
Result: Service interval 6 → 24 months; 60 % savings

Sub-Heading: Diamond-Like Carbon Coating (DLC) vs. External Benchmarks

For a deeper dive into DLC tribology, see the authoritative review by Robertson in Materials Science and Engineering (DOI:10.1016/j.mser.2022.100800). JLY Precision Tech aligns its process parameters with these peer-reviewed findings.