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What is Plasma?

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Plasma assisted physical vapour deposition

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Brazing

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Plasma Treatment of Surfaces

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Plasma Treatment of Silk

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Anti corrosion coating

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PVD coating on the inner surface of tubes

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Plasma technology in medicine.

 
SERVICES

Bangalore Plasmatek can, at present, deposit following coatings on cutting tools and other components.

Aluminium, Titanium, Nickel, Copper, Stainless steel, Gold, Silver, Special alloys, Titanium Nitride (TiN), Titanium Carbide, Titanium Carbonitride (TiCN), Multilayer coatings, Composite coatings.

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RESEARCH & DEVELOPMENT

The coating system at Bangalore Plasmatek, which includes vacuum arc and magnetron sources, was developed indigenously. The processes for various coatings are also developed in house.

Bangalore Plasmatek enjoys taking up challenging research and development projects.

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Plasma Treatment of Surfaces


Polymers (commonly used plastics are also polymers ) have become indispensable to our daily life. It is relatively easy to manufacture intricate and attractive articles from a variety of plastics on mass scale economically. Polymers are engineered to meet specific technical requirements. Surface properties of polymers need to meet different demands. Frequently plastics need to be bonded to other materials including plastics, metals, glasses, ceramics etc. Such requirements are common in electronics and medical appliances. However polymer surfaces are generally hydrophobic and have poor wettability. As a result adhesives do not stick properly. It is important to develop an environmentally friendly technique of modifying the adhesive properties of plastics.

Bangalore Plasmatek has recently developed a technique of improving the wettability of surfaces. More technically speaking, we can make certain surfaces more hydrophilic. A water droplet placed on most of the plastics just rolls off. It does not wet the surface. Exposing the plastic to the plasma makes the water drop spread on the surface instead of rolling off. This is important if you want to stick something to the plastic or print on it.


The plasma used to treat surfaces is shown in the picture above.

The two pictures below show the effect of plasma treatment on acrylic sheets.


Teflon is a well known hydrophobic material. It repels water. That is the reason it is used as non stick coating for cook ware. Plasma treatment can increase the affinity of Teflon to water as seen in pictures below.


The drop looks flatter on plasma treated surface showing its increased affinity to Teflon.

The plasma increases the surface energy by altering the chemical bonds on the surface of polymers.


The picture below shows two electronic connectors which need to be glued to some chassis. The one on the left is not plasma treated. Water does not spread on its surface. It has low wettability and can not be glued to the chassis. The one on the right is treated with plasma. The surface energy has increased and water spreads readily on its surface. Now the connector can be glued to the chassis easily.




It is found that the plasma treated surfaces retain their good wetting properties for several months.

Bangalore Plasmatek can provide custom specific plasma treatment machines as well as take up job work of plasma treatment.

Plasma Cleaning Machine:
Bangalore plasmatek has developed a new machine “Plasma cleaning system 102B” for plasma cleaning. The stainless steel plasma chamber has dimensions 1500 mm x 400 mm x 300 mm with a user friendly loading system and view ports.



It is found that plasma cleaning gives highly reliable bonding of the die cast aluminum casings. The cleaning is achieved by bombardment of the surfaces by plasma species like energetic ions, electrons, ultra violet radiation etc. An exposure time of ten minutes is found to be sufficient. Cleaning is also accompanied by increase in the wettability of cleaned surfaces, in other words, cleaned surfaces are rendered more hydrophilic. Plasma cleaning is found to be effective for metals, plastics as well as ceramics. However plasma cleaning can not remove heavy contamination like stains, oil, rust etc.

 

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