High absorptance & emissivity black coatings

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Technology abstract

A world leader in high absorptance & high emissivity black coatings for stray light suppression in high performance optics.

Technology Description

Where signal -to-noise determines the quality of images or the sensitivity of sensors these coatings provide superior stray light suppression across the spectrum from EUV through the IR.
The proprietary sophisticated vacuum deposition (vacuum coating) technology generates unique coating surface areas with exceptional characteristics, superior to those achievable by other processes that provide important commercial applications.
Satellite-borne optics typically require the highest level of stray light suppression combined with compatibility with space conditions. Space-qualified coatings combine superior optical performance with a unique mix of features and advantages
such as wide-range thermal stability, essentially zero outgassing, vacuum comp atibility, and sur vival under space radiation.The maintenance of knife edge geometry in star-tracker baffles is an example where the coating provides a significant performance boost.
The application of vacuum coatings technologies leads to major improvements in a wide range of applications including, optical performances, solar energy, aluminum electrolytic capacitors, electronic enclosures, heat sinks, among others.
Below are some of the main characteristics of the coatings:

  • Uniquely large specific surface area combined with very small coating thickness – 2000 times the substrate surface in a coating only microns thick
  • Close control of surface morphology – form and structure – for control of physical, optical and radiation characteristics
  • Retention of substrate thickness and mechanical strength – specific surface coating technology rather than etching technology
  • Controlled morphology, porosity and chemical composition of the coating allows tailoring of physical and optical properties
  • Vacuum coating operating at temperatures: -269°C to +450°C
  • Excellent adhesion to metallic and non-metallic substrates
  • Excellent mechanical strength and abrasion resistance
  • Low outgassing
  • Ecologically clean – no aggressive chemicals used
  • Inorganic and completely nontoxic
  • Totally ecologically friendly
  • Dry process and dry materials
  • No chemical wastes, no waste water
  • completely non toxic and Inorganic coating

Innovations & Advantages

The combination of a very low reflectance, high thermal stability, excellent adhesion, and low outgassing in a coating that is only a few microns thick is very unique.
The black coatings are suitable for essentially all engineering materials – metals and alloys, polymers, silicon, glass, and ceramics.
The company offers six types of Black coatings, each designed for a specific wavelength or application, as well as tailored coatings to our client’s specific needs.

Further Information

The coatings are suitable for essentially all engineering materials – metals and alloys, polymers, silicon, glass, and ceramics– the complete detailed list is as follows:
Metals

  • Aluminium
  • Beryllium
  • Cobalt
  • Copper
  • Gold
  • Iron
  • Magnesium
  • Molybdenum
  • Nickel
  • Niobium
  • Palladium
  • Platinum
  • Silver
  • Titanium
  • Tungsten
  • Zirconium

Ceramics

  • Alumina
  • Boron nitride (BN)
  • Ferrite
  • Fused Quartz
  • MACOR® Machineable Glass Ceramic
  • Porcelain
  • Sapphire
  • Silica and fused Silica
  • Silicon carbide (SiC)
  • Silicon nitride (Si3N4)
  • Titanium carbide
  • Zirconia

Polymers

  • Kapton
  • Polymethyl methacrylate (PMMA)
  • Polyesters
  • Polypropylene
  • Polystyrene
  • Polythene
  • Polytetrafluoroethylene (PTFE) (“Teflon”)
  • Polycarbonate (PC)
  • Acrylonitrile butadiene styrene (ABS)
  • NORYL
  • Liquid Crystal Polymer (LCP) (“Vectra”)

Current and Potential Domains of Application

opto-mechanical components
light trapping applications
lens housings
light baffles
IR sensors
UV sensors
passive infrared detectors
black bodies
light detectors
UV absorbers