HIGH-TECH SURFACE COATINGS.

By means of established methods, high-quality materials, and advanced procedures, the experts at DURIT are day by day working on making components even more resilient. The large variety of products that we improve by applying PVD and CVD or thermal coatings is almost infinite.

DISCOVER THE
COATING PROCEDURES
AT DURIT:

 

Coatings
by DURIT:

minimize wear

increase corrosion resistance

lead to extended service lives

reduce costs

enhance productivity

 

THERMAL
SPRAY COATINGS.

Thermal spraying is especially effective for applying a wear-resistant surface to large-volume components. In this process, the substrate is coated with high-quality  COATING MATERIALS like carbides and tungsten carbides, respectively, ceramics, or metals.

In the field of thermal spraying, also referred to as flame spraying, DURIT realizes customized solutions. At first, WEAR PATTERNS and potential CAUSES OF MALFUNCTION including all operationally-related PARAMETERS – e.g. temperature, pressure, adjacent components, or the processed medium – are analyzed in detail. The result: DURIT develops components and tools exactly adjusted to the respective requirements. Previous wear problems are thus SPECIFICALLY OPTIMIZED AND PERMANENTLY SOLVED.

» Thermal spray processes

 

» Coating materials
(Other coating materials on request.)

HVOF

High Velocity Oxi-Fuel
» more » »
»

Carbide

WC/Co WC/Co-Cr WC/Ni WC/NiCr WC/NiCrBSiFe Cr2C3/NiCr » more » »

APS

Atmospheric Plasma Spraying
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»

Ceramic

Al2O3 TiO2 Al2O3/TiO2 Cr2O3 Cr2O3/TiO2 Cr2O3/SiO ZrO2/CaO ZrO2/MgO ZrO/YO/CeO ZrO2/Y2O3 » more » »

EAWS

Electric Arc Wire Spraying
» more » »
»

Metal

Cu Co Al Zn Mo NiAl NiCr NiCrMo NiCrAIY » more » »

Laser Cladding

» more » »
»

Metal

Verschleißfeste Nickel-Cobalt basierende Legierungen » more » »
 

HVOF High Velocity Oxi-Fuel

By means of this high-quality treatment, carbide or metallic wear protection layers are applied. At first, a fuel/oxygen mixture is combusted at very high pressure. The mixture is subsequently accelerated to supersonic speed by a downstream nozzle and thus applied to the workpiece. Usually powdery substances are injected into the gas stream in order to get accelerated. HVOF is a highly kinetic thermal spraying procedure. Our coating experts are thus able to realize VERY DENSE LAYERS featuring optimized behaviour towards wear.

 

APS Atmospheric Plasma Spraying

In the course of the APS process, an arc is generated by a plasma torch. A gas mixture is passed though the arc and gets ionized. A fusing powder is subsequently injected into the generated stream. The plasma stream carries the powder particles off and moves them ONTO THE PROCESSED MATERIAL AT HIGH SPEED. This process is the most flexible of all thermal spray processes and it generates sufficient energy for melting every material. It also provides the possibility to create optimized layer thicknesses and surface properties regarding porosity and hardness.

 

EAWS Electric Arc Wire Spraying

ELECTRIC ARC WIRE SPRAYING is based on an arc continuously fusing two wires. The material is projected onto the substrate by means of a high-pressure air jet.
This coating procedure provides high jet rates at low gas consumption and it creates highly wear-resistant surface layers featuring an average  PPOROSITY of about 3 % and an ADHESIVE TENSILE STRENGTH of 40 MPa.

 

Laser Cladding

Coating treatments based on laser technology take a key role in today’s production and maintenance processes. Laser cladding is characterized by the use of laser for locally fusing the surface of the component. The powdery welding additive is added to the actual melt spot by means of a nozzle. The functional unit consisting of laser optics and powder nozzle causes welded seams on the processed component by its movement. If applied side by side, previously defined areas may be functionally coated and if applied one above the other, the layer thickness may be increased, in order to create or repair the component moulds.

 

Carbide coatings:

WC/Co, WC/Co-Cr, WC/Ni
» Tungsten carbide coatings
» Chromium carbide coatings
» Tungsten carbide coatings


Cr2C3/NiCR, WC/NiCrBSiFe, WC/NiCr
» Chromium carbide
» Nickel-chromium coatings


Properties:
» Average adhesive strength: >80 MPa.
» Average porosity 0.5 to 1 %.
» Average thickness of coating: 100 to 500 µm.

 

Ceramic coatings:

AI2O3, TiO2, AI2O3/Tio3
Aluminium oxide coatings
Titanium dioxide coatings


Cr2O3, Cr2O3/TiO2, Cr2O3/SiO
Chromium oxide coatings

ZrO2/CaO, ZrO2/MgO, ZrO/YO/CeO, ZrO2/Y2O3
Zirconium oxide coatings

and other materials

Properties:
Average adhesive strength: 20 to 50 MPa.
Average porosity 4 to 8 %.
Average thickness of coating: 200 to 1000 µm.

 

Metal coatings:

Cu
Copper coatings

Co
Cobalt coatings

Al
Aluminium coatings

Zn
Zinc coatings

Mo
Molybdenum coatings

NiAl, NiCr, NiCrMo, NiCrAlY
Nickel coatings
as well as noble metals and additional steels and metals


Properties:
Average adhesive strength: 15 to 40 MPa.
Average porosity 3 %.
Average thickness of coating: 200 to 5,000 µm.

 

SURFACE OPTIMIZATION
AND IMPROVEMENT
OF WEAR-RESISTANCE.

Advanced thermal spray treatments may individually and application-specifically realize significantly improved features. This especially pertains with regard to increased ENDURANCE AND DURABILITY. In this manner, tools and components are optimized by DURIT coatings in several respects.

REDUCTION of
» abrasion
» erosion
» friction
 
INCREASE of
» corrosion resistance

IMPROVEMENT of
» conductivity (electric, thermal)
» insulation (electric, thermal)

CREATION of 
» biocompatibility

 

 

This leads to INCREASED PRODUCTIVITY in use, which may be reflected in many different aspects:

» Improved service lives
» Reduced maintenance costs
» Lowered maintenance times
» Less downtime
» Higher quality of final products

 

PVD- and CVD-
Coatings.

Our coatings optimized regarding processing and wear increase the thermal and chemical endurance of tools and precision components.
FRICTION AND ADHESION ARE CONSIDERABLY REDUCED.


APPLICATION EXAMPLES

» Forming, cutting, and punching tools:
Punches, dies, cut-off tools, and moveable elements in general

» Injection moulds for plastics and light metal alloys:
Mould surfaces, hot runner moulds, ejector pins, and other moveable components

» Machining tools:
Diamond-coated tungsten carbide tools e.g. for processing GRP

» Special applications:
Engineering components and wear parts including seal faces, valve components, or bearings

 

PVD – Physical Vapour Deposition

The PVD process is based on the release of metallic layer components like titanium, aluminium, zirkonium, or chromium. They are converted into gas in high vacuum and their particles are conveyed TOWARDS THE COMPONENT by means of electrical fields and plasma. By adding a reactive constituent like nitrogen or carbon, THEY FIRMLY UNITE WITH THE SURFACE.

The PVD process provides the possibility to separate VERY THIN AND VERY HARD, BONDED LAYERS. The most common ones are: Titanium coatings, titanium-aluminium nitride coatings, titanium nitride coatings, chromium nitride coatings, and titanium carbide coatings.

All PVD coatings by DURIT convince due to their excellent adhesive strength. The use of PVD coatings by DURIT permanently minimizes wear.

Properties:
» good slide characteristics
» low friction coefficient
» high hardness
» oxidation resistance


PVD coatings thus realize less wear related to highly stressed components and tools.

 

CVD – Chemical Vapour Deposition

CVD stands for “Chemical Vapour Deposition“. At temperatures of about 1,000 °C, the LAYER COMPONENTS flow around the tool and react with elements of the substrate surface.
The LAYER SYSTEMS (TiC, TiN/TiC, or TiC/TiN) feature an average thickness of 7 – 10 µm.

The CVD process may be described as a formation of a thin, solid film developing from the deposition of the gaseous material. This substance is created by the chemical decomposition of a solid material. The emerging coatings feature HIGH WEAR RESISTANCE AND EXCELLENT ADHESION.

The first CVD-coated sort of tungsten carbide was a one-layered titanium carbide coating (TiC). Aluminium oxide coatings (Al2O3) as well as titanium nitride coatings (TiN) were added later. The chemical process within this treatment allows for the COATING OF BORES AND UNDERCUTS as well.

 

PACVD – Plasma Assisted Chemical Vapour Deposition

DURIT also offers PACVD or PECVD coatings for effectively coating tools and components. This abbreviation stands for: “Plasma Assisted (Enhanced) Chemical Vapour Deposition“.

The background of the PACVD process: The CVD process differs from the PVD process since all materials contained in the film are gaseous. In the PVD process, there is at least one solid material. This is usually a sort of metal. The PACVD process is a variant form and it is conducted at lower temperatures than the CVD process. Instead of thermal energy, it utilizes plasma for inducing this process.

 

OPTIMIZED WEAR RESISTANCE
WITH PVD AND CVD
COATINGS

The use of PVD and CVD processes may implement GOOD WEAR RESISTANCE AND HIGH HARDNESS specifically adjusted to the respective application. Moreover, both procedures offer various opportunities for specifically improving individual properties of the material regarding:

» oxidation resistance
» corrosion resistance
» biocompatibility

 

ACHIEVING MORE:
PVD, CVD, AND THERMAL SPRAY
COATINGS BY DURIT.

The COATING EXPERTS at DURIT will be happy to personally assist you and to take their time for you. Our design and technical sales department will certainly find the best solution for your tools or components as well. Our COATING EXPERTS are looking forward to getting in touch with you. Or send an email to:
» »   » INFO@durit.de

 

Any questions? We have the answers.

Heinz-Achim Kordt

Dipl.-Ing. (FH)
T +49 202 55 109 36
heinz-achim.kordt@durit.de

Stefan Grötschel

Dipl.-Ing. (FH) 
T +49 202 55 109 39
stefan.groetschel@durit.de