Boron Nitride particles 0,5µm in NI dispersion layer.
Photo: Forschungsinstitut Glas und Keramik GmbH, Höhr-Grenzhausen, Germany
of Ni-BN over
- low coefficient of friction and excellent release capability even at high temperatures
- increased surface hardness due to temperability above 450°C (upper limit for heat treatment of Ni-PTFE is approx. 220°C)
- easy recovery of Boron Nitride and re-utilization for new process cycles
- Boron Nitride is environmentally friendly and non-toxic
- no harmful fluorinated surfactants needed
- a wide spectrum of HeBoFill® materials for dispersion plating with hBN particle size ranging from less than 100 nm to several µm.
- expert advice regarding the use of HeBoFill® in electrogalvanic and autocatalytic baths
- just-in-time-delivery thanks to a refined logistics system, and consequently, a high degree of customer satisfaction
Dispersion Layers using HENZE Boron Nitride
Limitations of Ni-PTFE dispersion layers
There is a growing demand, originating mainly from the automotive and machinery sectors, for self-lubricating coatings with good sliding qualities, high wear resistance and/or anti-stick characteristics. To obtain these particular surface properties, different materials must be combined in hybrid layers. This is done by dispersing functional particles – up to now mostly PTFE – in the galvanic bath and depositing them together with the metal, e.g. nickel, on the substrate. There are certain drawbacks, however. PTFE has a relatively low temperature resistance which considerably limits its usefulness. More recently, there is evidence that the fluorinated surfactants needed to disperse the PTFE pose a risk to health.
NEW: Hybrid layers with Boron Nitride: The superior option
In the US there is a growing demand of hexagonal Boron Nitride for electroplating. Boron Nitride lubricating agent is an option technically and economically superior to PTFE. It resists high temperatures and maintains its excellent dry lubricating and release properties up to 900°C in air. Consequently, the range of possible applications for hard coatings generated by dispersion plating is considerably expanded.
Read more (in German only): "Tribologische Nickel-Dispersionsschichten mit hexagonalem Bornitrid. Teil 1: Tribologische Eigenschaften", Rüdiger Hartung, Jürgen Schmidt, Sabine Both, in: Periodical GALVANOTECHNIK, 12/1008.Download PDF
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