Naxau Vacuum Coating Processing - Naxau AM
01 Common Types of Neritic Lions in the DLC #
DLC (DIAMOND-LIKE CARBON) Diamond-Like Carbon Coating, is a kind of artificial material with SP3 (diamond structure) and SP2 (graphite structure) or hybridized with elements such as hydrogen, silicon, fluorine and metal, etc. DLC is a general term for carbon film material, which has various properties such as high hardness, corrosion resistance, low friction, electrical insulation, etc. The performance of the various anisotropic properties depends on the ratio of the structural bond and the The heterogeneous properties depend on the ratio of structural bonds and the type of coordination bonding elements.
DLC has some of the properties of diamond and is harder than most metals used in industry. It is the most commonly used self-lubricating coating in mechanical equipment.
- a-C = hydrogen-free amorphous carbon film
- a-C:H = hydrogen-containing amorphous carbon film
- ta-C = tetrahedral hydrogen-free amorphous carbon film
- ta-C:H = tetrahedral hydrogen-containing amorphous carbon films
- a-C:X = elementally doped hydrogen-free amorphous carbon film
02 Application and Characterization of DLC Coatings: Naxau Coating #
DLCs can be customized with a variety of functional coatings by adjusting sp3, sp2 and elemental doping.
- High hardness: 2000HV-6000HV
- Low coefficient of friction (0.02-0.2)
- High corrosion resistance (increased thickness and additional priming can significantly improve corrosion resistance)
- Strong adhesion to the substrate
- micromotion resistance
- Adhesive wear resistance
- Self-lubrication under dry wear conditions
- Approx. 10 ~100-6 Ω insulated or conductive, usually hydrogen-containing DLC insulation
03 Common applications of DLC coatings: #
- Machining tools for aluminum, aluminum alloys and powder metallurgy alloys
- Metal forming molds, rubber molds, plastic injection molds
- Plastic and extrusion molds with abrasion and corrosion resistance, good release properties and antimicrobial properties
- Hydraulic components - cylinders, piston rods, gear pumps, guide rings, ejector rods
- Valve components - ball, gate, ball valve, actuator
- Automotive parts - crankshafts, camshafts, gears, bearings, piston rings, tappets, wrist pins, fuel injectors
- Pump components - impeller, diffuser, rotor
- Mechanical shaft seal
- Insulation of parts
- High-end black exterior decorative plating - watch frames, smart bracelets and other wearable devices
04 Preparation of DLC coatings #
PeCVD can prepare various types of DLC coatings. Typical DLC coatings have a thickness of 1-2 μm, with ta-C below 0.5 μm. This makes DLC coatings poor at resisting severe wear or corrosion.
Nahshi (name)P Series DLC Vacuum CoaterThe multi-layer film and transition layer structure allows for ultra-thick DLC composite films of 10μm or more to dramatically increase DLC lifetime and film bonding. At coating temperatures below 250°C, PACVD can deposit a wide range of non-conductive and conductive substrates. NanoLion PACVD coating equipment, the deposited coatings contain amorphous sp3 bonds of about 70%, which allows the deposition of ultra-hard ta-C coatings. The HIPIES technology further enhances the hardness of ta-C coatings.
The Nash PACVD has many advantages:
- No droplets, no post-polishing
- Deposits on a wide range of substrates including metals, non-metals, plastics, silicon carbide ceramics, etc.
- Good film thickness uniformity within an effective height of 900mm
- Gas processes and ultra-pure graphite targets are available for different deposition needs
- Dual ion etching technology for cleaning, scrubbing or sputter cleaning product surfaces and improving adhesion of coatings to substrates
The basic parameters of Naxi P series vacuum coating machine are as follows:
| P850 | P1200 | P1600 | |
| Effective size of plasma [mm] | D680x850 | D680x1200 | D800x1600 |
| Load capacity [kg] | 500 | 800 | 1200 |
| PVD technology | CFS , PECVD | CFS , PECVD | CFS , PECVD |
| Etching technology | SET | SET | SET |
| Number of cathodes | 4 | 4 | 6 |
| Coating time [h] | 10-12h | 10-12h | 10-12h |
| Coating hardness [hv] | 1200-2500 adjustable | 1200-2500 adjustable | 1200-2500 adjustable |
| Roughness Ra[um] | <0.05 | <0.05 | <0.05 |
| Binding force - scratch[N] | >30, >20 | >30, >20 | >30, >20 |
| Coating type | Cr+W-C:H+a-C:H, Cr+WC-C:H. GLC, Al-Sn-Cu, MoS2, etc. | Cr+W-C:H+a-C:H, Cr+WC-C:H. GLC, Al-Sn-Cu, MoS2 | Cr+W-C:H+a-C:H, Cr+WC-C:H. GLC, Al-Sn-Cu, MoS2 |
| Floor space D*W*H (mm) | 4600x2300x2000 | 4600x2300x2300 | 4600x2300x2500 |
Other:
05 DLC Wear Test #
Depending on the wear mechanism, choosing either a smoother surface or a harder substrate is a way to reduce the wear rate of DLC coatings. Effective at high speeds and high bases (where the hard substrate supports the coating), wear rate: 2.O X 10-8 mm3/N-m
06 Comparison of DLC and CrN coated stamping die performance #
Both the DLC coating and the CrN coating have high hardness in the range of 2000 HV. In Nash's mold on-machine test, the first 100 parts were tested:
No wear on the CrN+ coating, but wear on the workpiece. Localized friction caused frequent need for cleaning of the mold;
The DLC coating, which produces a graphite layer has a very low coefficient of friction, and there is no wear on either the CrN+ or the workpiece;
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