Are nanomaterials used in the coating industry?

Infrared heat for electronics applications

ALD is a key process in the manufacture of semiconductor components or the synthesis of nanomaterials. ALD technology is based on a chemical process in a gas phase. The so-called precursors react with the surface of a material and a thin film is slowly deposited through repeated exposure to individual precursors. Depending on the material, this process requires induction by heat or can be intensified by heat.

  • Infrared radiation is particularly suitable for heating processes under vacuum
  • Contactless transmission of high amounts of energy
  • Infrared emitters heat up very quickly and respond to the control in a very short time

Silicone casting compounds are used in particular in the automotive sector to protect components with electronics from moisture, dust, salt spray or vibrations.

If the parts are preheated before overmolding, the plastic will remain flowable for the required time. Infrared systems react very quickly to the control, faster than hot air, so that preheating can take place at the same time as the usually robot-based process.

Riveting electronic components in plastic housings is difficult when the pins are difficult to access due to the narrow space. The narrowness in combination with the heat-sensitive components requires heat sources such as infrared emitters. These transfer the heat automatically and reliably in a targeted manner only to the rivets, thus helping to reduce rejects. In contrast to contact heat, plastic cannot melt on hot contact surfaces. Infrared radiation is directed onto the pens so that sensitive electronics or coated surfaces are protected from heat damage.

Printed materials in the electronics industry require intelligent solutions for drying and sintering prints. Heraeus has developed infrared processes for the post-treatment of web printing. Extensive research and tests with various techniques have resulted in optimal solutions for the end user. Heraeus also performed advanced numerical computer simulations to predict and confirm the results.

Ray tracing simulations were used to ensure that the structure geometry was optimized for the respective application. The photo above shows a process that is divided into a drying zone (50 kW / m² lamp power) and a sintering zone (150 kW / m2 lamp power).

Inks, printing techniques and substrates with IR technology

Heraeus has extensively tested all successfully processed combinations of colors, printing techniques and substrates with the help of infrared technology. This also includes a dielectric material that is usually hardened by UV light. By fine-tuning the parameters of the infrared process, optimal drying and sintering conditions were achieved for all combinations:

  • Power density range: - 20 to 220 kW / m2
  • Peak emission wavelength between 0.9 and 2.0 µm (corresponds to filament temperatures from 1200 ° C to 3000 ° C).
  • IR drying and sintering at a web speed of 60 m / min.
  • Particularly suitable for mass production