PVD vs DLC

Ceramic hard.
Or ultra-slick.
Both thin films.

Both PVD and DLC are thin-film coatings applied by vapor deposition. PVD (titanium nitride family) creates hard ceramic surfaces. DLC creates low-friction diamond-like carbon. Different physics, different applications.

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01 · At a glance

Side-by-side summary.

Option A

PVD (TiN/AlTiN/CrN)

Physical Vapor Deposition of metal nitrides or carbides. TiN gold, AlTiN violet-black, CrN silver. 2-5 µm thick, 2000-3000 HV. Standard for cutting tools, premium cosmetic.

Option B

DLC (Diamond-Like Carbon)

Amorphous carbon film with diamond-like properties. Matte black appearance. 1-5 µm thick, 2000-4000 HV. Ultra-low friction coefficient (0.05-0.15). Automotive, firearms, wearables.

02 · Detailed comparison

Feature-by-feature breakdown.

Attribute	PVD (TiAlN)	DLC
Typical thickness	2-5 µm	1-5 µm
Hardness	2500-3500 HV	2000-4000 HV
Friction coefficient	0.4-0.6	0.05-0.15
Color	Various (gold, violet, black)	Matte black
Temperature limit	800°C+ (TiAlN)	250-400°C
Substrate temperature	300-500°C	150-250°C
Substrate compatibility	Steel, carbide, ceramic	Steel, plastic, other
Wear against metal	Very good	Excellent
Chemical resistance	Good	Excellent
Cost per part	$20-150	$30-200
Production complexity	Established	Specialty
Typical applications	Cutting tools, molds	Engine components, firearms, watches

03 · Decision guide

When to choose each.

Choose PVD (TiN/AlTiN/CrN) when:

Cutting tool inserts and drills
Injection mold cavities (tool steel wear)
Premium cosmetic (gold TiN)
High-temperature service (AlTiN)
Forming punches and dies
Food processing cutting hardware

Choose DLC (Diamond-Like Carbon) when:

Low-friction sliding (engine pistons)
Firearms slides and triggers
Watch case and bezel (black aesthetic)
Medical orthopedic implants
High-end bike components
Automotive performance engine components

FAQ

Common questions.

DLC has sp3 bonding similar to diamond (as opposed to sp2 bonding of graphite). Result: extreme hardness (approaching diamond), chemical inertness, low friction. But amorphous (non-crystalline) — not actually diamond. Can be deposited at lower temperatures than crystalline coatings, compatible with heat-sensitive substrates. Trade-off: temperature limit around 300°C vs diamond's 700°C stability.

TiN (gold): older, lower cost, general steel machining. 2500 HV. TiCN (gray): harder than TiN, for abrasive materials. 3000 HV. TiAlN (violet-black): better at high temperature, standard for aerospace machining. 3500 HV, stable to 800°C. AlTiN: modified TiAlN with higher aluminum — better oxidation resistance. For tough materials (stainless, Inconel): AlTiN. For general steel: TiCN or TiN. For aluminum: diamond-like or uncoated (ceramic coatings can weld to aluminum).

Yes — DLC low-temperature deposition (150-250°C) compatible with many plastics and other heat-sensitive substrates. Standard PVD typically requires 400°C+, damaging plastics. DLC used for: plastic optics (scratch-resistant coating on sunglasses), plastic consumer products (wear-resistant surfaces), medical plastics. Specialty application but growing market.

Both PVD and DLC are line-of-sight processes — coating deposits preferentially on surfaces facing the source. Complex internal geometry: incomplete coverage. Workarounds: (1) Part rotation during deposition for better uniformity. (2) Multiple sources in chamber. (3) For critical internal coverage, different process (electroless nickel for uniform coverage). For mostly-external-surface parts: PVD and DLC work well.

PVD: established process, many vendors, competitive pricing. Small parts: $20-50. Large parts: $50-150. DLC: specialty process, fewer vendors, higher cost. Small parts: $40-100. Large parts: $80-200. Both add 50-200% to base part cost. Justified when: tool life improvement, premium product differentiation, specific performance requirement. Not economical for general industrial.

PVD: 5-10 days typical. DLC: 7-14 days. Both require shipping to coating vendor and back — plan into project timeline. For urgent orders, air freight between coater and customer reduces transit time. Some PVD shops offer 3-day rush service at premium. DLC rarely has rush availability.