DLC Hardness ChartDLC (diamond like carbon) coatings are a family of coatings with properties and underlayers that can be adjusted to provide the optimum performance for an application. Within the DLC family of coatings, the coating hardness and can vary tremendously depending on the region of the phase diagram the coatings fall in to. The ratio of SP2 to SP3 bonding and hydrogen content can vary in the film depending on the process used to deposit the DLC coating and the process parameters. The phase diagram to the right shows the various groups or regions for DLC coatings and the possibilities that are available. Films with higher SP2 bonding or graphitic content will exhibit lower film hardness and tend to provide lower abrasion-resistance. Films with a very high SP3 bonding content will tend to be very hard with a high level of abrasion-resistance but will be brittle and less ductile. Films with very high SP3 content and no hydrogen are tetrahedral DLC (ta-C) coatings exhibiting a very high surface hardness of up to 5000 Hv but offer low ductility.

All DLC coatings will have multiple bonds and varying hydrogen content within the coating. Depositing a film that combines the proper amount of hydrogen as well as the proper ratio of SP2 to SP3 bonding and the best underlayer for the application is key to providing customers with low friction, a high level of wear-resistance, ductility and proper adhesion and load carrying capability. NCT works with customers to understand the wear modes and operating conditions of your component to select the best DLC coating for your application.

DLC Diamond ChartDiamond Like Carbon

Certess DCC - SHOW - - HIDE -
Coating Composition Friction Coefficient
Dry
Friction Coefficient
Lubricated
Hardness
(Hv)
Coating
Thickness
(microns)
Deposition Temperature
C
Maximum Service Temperature
C
Certess DCC a-C:H 0.11 – 0.15 0.07 – 0.11  2000 - 2500  1 – 5  150 - 300  Up to 350
Certess DCN - SHOW - - HIDE -
Coating Composition Friction Coefficient
Dry
Friction Coefficient
Lubricated
Hardness
(Hv)
Coating
Thickness
(microns)
Deposition Temperature
C
Maximum Service Temperature
C
Certess DCN Nano  Grain CrN + a-C:H 0.11 – 0.15 0.07 – 0.11 2500 – 3200    1 – 5  150 - 300   Up to 350
Certess DCY - SHOW - - HIDE -
Coating Composition Friction Coefficient
Dry
Friction Coefficient
Lubricated
Hardness
(Hv)
Coating
Thickness
(microns)
Deposition Temperature
C
Maximum Service Temperature
C
Certess DCY Cr + a-C:H 0.11 – 0.15 0.07 – 0.11  2500 – 3200  1 – 5  150 - 300  Up to 350 
Certess DDT - SHOW - - HIDE -
Coating Composition Friction Coefficient
Dry
Friction Coefficient
Lubricated
Hardness
(Hv)
Coating
Thickness
(microns)
Deposition Temperature
C
Maximum Service Temperature
C
Certess DDT WCC  a-C:H + a-C:H 0.11 – 0.15 0.07 – 0.11 2500 – 3200   1 – 5  150 - 300  Up to 350 
Certess DT - SHOW - - HIDE -
Coating Composition Friction Coefficient
Dry
Friction Coefficient
Lubricated
Hardness
(Hv)
Coating
Thickness
(microns)
Deposition Temperature
C
Maximum Service Temperature
C
Certess DT a-C:H+W 0.20 – 0.25 0.10 – 0.15  1200 - 1400  1 – 5   150 - 300  
Certess DCX - SHOW - - HIDE -
Coating Composition Friction Coefficient
Dry
Friction Coefficient
Lubricated
Hardness
(Hv)
Coating
Thickness
(microns)
Deposition Temperature
C
Maximum Service Temperature
C
Certess DCX CrN+a-C:H 0.11 – 0.15 0.07 – 0.11 2500 - 3200   1 – 5   150 - 300   Up to 350
Cetress DTMO - SHOW - - HIDE -
Coating Composition Friction Coefficient
Dry
Friction Coefficient
Lubricated
Hardness
(Hv)
Coating
Thickness
(microns)
Deposition Temperature
C
Maximum Service Temperature
C
Certess DTMO

WCC
(a-C:H+W ) {Modified}

0.20 – 0.25 0.10 – 0.15 1800 – 2000   1 – 5  150 - 300  

Summary Chart - SHOW - - HIDE -
Coating Composition Friction Coefficient
Dry
Friction Coefficient
Lubricated
Hardness
(Hv)
Coating
Thickness
(microns)
Deposition Temperature
C
Maximum Service Temperature
C
Certess DCC a-C:H 0.11 – 0.15 0.07 – 0.11  2000 - 2500  1 – 5  150 - 300  Up to 350
Certess DCN Nano  Grain CrN + a-C:H 0.11 – 0.15 0.07 – 0.11 2500 – 3200    1 – 5  150 - 300   Up to 350
Certess DCY Cr + a-C:H 0.11 – 0.15 0.07 – 0.11  2500 – 3200  1 – 5  150 - 300  Up to 350 
Certess DDT WCC  a-C:H + a-C:H 0.11 – 0.15 0.07 – 0.11 2500 – 3200   1 – 5  150 - 300  Up to 350 
Certess DT a-C:H+W 0.20 – 0.25 0.10 – 0.15  1200 - 1400  1 – 5   150 - 300  
Certess DCX CrN+a-C:H 0.11 – 0.15 0.07 – 0.11 2500 - 3200   1 – 5   150 - 300   Up to 350
Certess DTMO

WCC
(a-C:H+W ) {Modified}

0.20 – 0.25 0.10 – 0.15 1800 – 2000   1 – 5  150 - 300