PVD Coatings & DLC Coatings

PVD COATING: PHYSICAL VAPOR DEPOSITION

PVD – Physical Vapor Deposition – is a coating technology that allows depositing of a thin film onto many different kinds of base materials. During the process, different metals which can be deposited - like titanium, zirconium, and chrome – evaporate in a vacuum atmosphere. Due to kinetic energy and a potential difference between the products, ions move on the surface where they condense creating the desired coating.
The metal film is obtained by a complete physical process and therefore possesses higher technical characteristics than any other chemical or electro-chemical process. PVD coating is particularly recommended for all those innovative quality products which require high chemical and technical features (resistance to abrasion, scratches, and corrosion) and at the same time offers a wide choice of chromatic colors.

PVD COATINGS FOR DECORATIVE APPLICATIONS

PVD coatings, with a layer thickness in between 0,2m and 2 m, presents exceptional aesthetical features as well as it guarantees a very long life for the durability.

Decorative PVD coatings can be used in different appliance areas, for example: door  and window hardware (handle, locks), writing components, surgical equipment, furniture accessories, glass and ceramics objects, nautical accessories, mobile telephone accessories, illuminating engineering components, automotive components, fashion accessories, sports accessories, glasses and watch cases, kitchen accessories, flatware, costume jeweler, etc.

PVD Coatings PVD Coatings

PVD COATINGS FOR FUNCTIONAL APPLICATIONS

General characteristics

Functional-Tribological applications coatings have a variable thickness from 1 to 6 microns and coating temperature which can reach up to 600°C. Deposition are similar as the ones described in “Decorative coating” section. However the principal purpose of these coatings is to increase working performance and operative endurance of the coated units significantly. Technical coatings are used in various fields due to their extreme hardness, good adhesion to the substrate, corrosion resistance, low friction coefficient.

PVD Coatings

All coatings have different technical characteristics. Follow the most common technical PVD coatings:

PVD Coatings tin

TiN

Titanium Nitride has the first PVD coating, used for cutting tools.
Thanks to the biocompatible characteristics – ISO 10993.10 IN Europe and USA – TiN is widely used in biomedical applications (prosthesis, dental instruments, etc.).
Longer product time life and more reliability are some TiN advantages in many sectors, for example plastic molding.

PVD Coatings ticn

TiCN

High toughness, wear resistance and high surface hardness are the main Titanium Carbonitride characteristics.
Some of the principal applications are molding or milling cutters.
With TiCN the right temperature in exercise is not more than 400°C.

PVD Coatings Titanium Aluminum Nitride

TiAIN

Titanium Aluminum Nitride can support high temperature (even up 600°C).
It is widespread used not only for tools (cutting and drilling), but also for many other applications.

PVD Coatings Chrome Nitride presents

CRN

Chrome Nitride presents goods technical characteristics. Toughness structure allow to create thicker coatings. CrN has also a perfect resistance to thermal shock, high corrosion resistance and low wear coefficient.

PVD Coatings Aluminum Chrome Nitride

AlCrN

Aluminum Chrome Nitride process can be done at 200°C and it guarantee a perfect adhesion.
Developed for high speed machining, it is used also for other applications as coining, bearings stamping, extrusion, drilling and dry machining.

PVD Coatings Zirconium Nitride

ZrN

Zirconium Nitride has the typical pale yellow color. It has superior characteristics – higher surface hardness and corrosion resistance – compare TiN coatings.

DLC COATINGS

DLC coating (Diamond Like Carbon) is a metastable form of amorphous carbon containing a significant fraction of sp3 bonds. The quantity of sp3 bonds define mechanical and tribological characteristics. DLC Coatings

The picture above represents general DLC diagram family (J. Robertson, 2002). It is possible to divide in different DLC family depending on quantity sp2 or sp3 bonds and hydrogen atoms.

DLC coatings have good technical characteristics, as high surface hardness, low wear coefficient, chemical inertness, excellent corrosion resistance.

TECNOLOGIES FOR DLC COATINGS

Different technologies can be used for DLC coating, depending on technical characteristics. Follow the most important technology in the industry production.

SPUTTERING

The most common industrial process for the deposition of PCD is Sputtering. Magnets are placed behind the target to cause the electrons evaporation and thus the degree of plasma ionization. Generally Argon ion bombardment helps to formation sp3 bonding. Through Sputtering technology is possible to create a-C:H DLC coating using a Argon and Hydrogen plasma or Methane and a-CNx DLC coating with Argon – Nitrogen plasma. A second Argon ion beam can be used to bombard the growing film, to encourage sp3 bonding. This is called ion beam source. Sputtering is preferred for industrial application because of versatility, its widespread use to sputter many materials. The deposition conditions can be controlled by the plasma power and gas pressure, but they are reasonably independent of the substrate geometry.

PLASMA BEAM SOURCE

lasma Beam Source is used in Hybrid system PVD- PECVD. This technology is able to produce high quality coating. Low process temperature guarantees thicker coating and perfect adhesion. Plasma is created inside two electrodes in resonance, the high energy allow to create sp3 bonds. With Plasma Beam Source it is possible to realize different DLC coatings, as ta:C-H and Me:C:H.

DLC COATING APPLICATIONS

DLC coatings provide different solution on customized request. There are many applications both decorative and functional. Below some of the most important sectors.

DLC Coatings Higher performances Automotive

Automotive & Motorsport

Higher performances, lower consumption and increased reliability are the main DLC coating goal for automotive applications. Injection, pistons, piston rings, valves and others motor components have increased their performances thanks to DLC coatings: higher surface hardness, perfect abrasion resistance and lower wears.

DLC Coatings Plastic Moduling

Plastic Moulding

DLC coatings allow many advantages – qualitative and economic – for moulding applications:

DLC Coatings Oil

Oil & Gas

Corrosion resistance, low wear coefficient, process reliability are the main requires in oil&gas sector. DLC coatings can provide innovative and advanced solutions.

DLC Coatings Components

Components

Thanks to low wear coefficient, DLC coating is the most common in all ambient where it is necessary to decrease adhesive load. Besides, The good coating prosperities allow to use cheaper based materials. There are many applications, as mechanical components, transmission shaft, etc.

DLC Coatings textile

Textile

Wear resistance is one of the most important problem in the textile sector (comps for high speed system, ceramic inserts, other components, etc). DLC coatings provide perfect solutions on different substrates.

DLC Coatings decorative

Decorative

With DLC coating it is possible to create a top end products thanks to high aesthetic characteristic and scratch resistance.
A typical application is the watch industry.

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