TAKE ADVANTAGE OF THE SYNERGY EFFECTS BETWEEN PLASMA AND PARYLENE COATING
Nature as an example
Plasma is not an invention of mankind. It is formed in the tails of comets, in thunderstorms and in stars, including our sun. Auroras are another example of fascinating plasma phenomena.
If energy is continuously supplied to a solid, a change in the aggregate state begins, from the solid to the liquid to the gaseous state. If you now continue to add energy to this gas, the atomic shell of the gas atoms begins to break up. In the process, free radicals of negatively charged electrons and positively charged ions are released. This mixture of neutral atoms or molecules, ions and free electrons is called plasma.
The state that has now been reached is also widely known as the fourth state of matter.
PLASMA - the fourth state of matter
Energy / Temperature
The molecule is charged
Possibilities of surface treatment
Plasma is an economical and efficient solution for cleaning and activating surfaces. It achieves an improvement in the wettability of the surface, which is an important prerequisite for adhesion during painting, gluing, printing or bonding. All vacuum-compatible materials (rubber, glass, metals, ceramics, plastic, silicone) are suitable for plasma processes:
The range of possible applications in the field of professional surface treatment is versatile.
Here are some examples:
- Cleaning and activation of surfaces
- Reduction of oxides on metallic surfaces
- Removal of photoresists in semiconductor technology
- Ashing of organic substances such as photoresists
- Removal of SU – 8 varnishes and sacrificial layers
- Cleaning and etching of solar cells, PCBs, kapton films (roll to roll)
- Etching of multi-layer PCBs.
- Plasma process before bonding and potting, BGAs, Flip Chip, Chip
- on Board technology
- Customised polymer layers
- Plasma frontend/backend applications
The formation of gaseous and liquid products is crucial for the cleaning and etching effect. The components of the plasma react with the organic impurities; even at room temperatures, they will already degrade to water and carbon dioxide.
Wet-chemically washed and plasma-cleaned
Activating surfaces to improve the wettability of the surface
Due to the electrons, ions and high-energy radiation generated in the plasma, bonds are broken and reactive regions are created.
The radicals formed in this way react with each other and provide additional crosslinking in the surface. This creates an active surface.
Inert gases (i.e. inactive gases, noble gases such as helium and argon) or gases which do not contain atoms capable of chain formation, such as N2, O2 or NH3, are used.
In the case of gases that are not noble gases, such as N2 or O2, the atoms contained in them can additionally be incorporated into the surface and thus cause a change in the surface property by new functional groups.
Surface energy and thus wettability and adhesion of paints, as well as adhesiveness, can be improved in a targeted manner.
Before plasma treatment
After plasma treatment
Plasma etching is a material-removing, plasma-assisted dry etching process that is used on an industrial scale, especially in semiconductor, microsystem and display technology.
In physico-chemical etching, two etching mechanisms are used in one process:
- the ion bombardment of the substrate, and
- a chemical reaction on its surface.
- Physical and chemical effects are combined with each other: The bombardment with the ionised reaction gas or other ions weakens or destroys the chemical bonds of the atoms on the surface, so that the reactive gas can react more easily and thus enhances the chemical effect in the affected areas.
Plasma polymerisation is a special plasma-activated variant of chemical vapour deposition (PE-CVD).
Vaporous organic precursor compounds (precursor monomers) are first activated by plasma in the process chamber, resulting in ionised molecules.
Already in the gas phase, the first molecular fragments are formed in the form of clusters or chains. The subsequent condensation of these fragments on the substrate surface, under the action of substrate temperature, electron and ion bombardment, causes polymerisation and thus the formation of a closed layer.
Functional coating for surface treatment:
- Micro flow, high surface energy, permanently hydrophilic properties
- Thin Glyde, reduces friction on plastic and rubber surfaces, dirt-repellent properties on plastics, antistatic properties
- Thin Guard, reduced surface energy, permanently hydrophobic surfaces, passivation
- Micro Tie, improved adhesion to metals and plastics, replaces environmentally harmful chemicals
Untreated metal surface
Treated metal surface
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