Microwave Plasma Technology

It is used for efficient processing, heating, drying or material transformation.

High efficiency, process reliability and complete customization.

Yes, Kerone offers fully customized engineering solutions.

Food, chemical, pharma, biomass, rubber, textile and more.

Kerone ensures high product quality through strict engineering standards, advanced testing procedures, and precision-controlled manufacturing systems.

Argon, nitrogen, oxygen, hydrogen, helium, air, and reactive gas mixtures can be used, with each producing different plasma characteristics and reactive species.

Yes, high-power microwave plasma systems operating at tens to hundreds of kilowatts are used for industrial-scale waste treatment, chemical synthesis, and materials processing.

Optical emission spectroscopy (OES) analyzes the light emitted by excited plasma species to determine plasma composition, temperature, and energy distribution in real time.

Microwave energy can sustain a stable plasma discharge at higher gas pressures than DC or many RF discharge methods because the rapidly oscillating electric field at 2.45 GHz efficiently transfers energy to electrons even when collision rates are higher at atmospheric pressure. Lower-frequency or DC plasma sources typically require reduced pressure to maintain the electron mean free path needed for sustained ionization. This atmospheric-pressure capability is what allows microwave plasma systems to be integrated into open production lines without the cost, complexity, and cycle-time penalty of vacuum chambers, while still delivering the high reactive-species density needed for effective surface treatment or material processing.

Plasma uniformity at lab scale is relatively easy to achieve in a small, well-characterized cavity, but scaling to industrial dimensions introduces challenges from standing wave patterns and uneven field distribution across a larger treatment area. Kerone addresses this through multi-applicator configurations, mode-stirring techniques, and careful waveguide design that distributes microwave energy evenly across the treatment zone. Substrate movement, such as conveyor-based scanning beneath a linear plasma source, also helps average out any residual non-uniformity by ensuring every point on the material passes through the same plasma exposure profile rather than relying on a single static, perfectly uniform field.

Thermal plasma exists in local thermodynamic equilibrium, where ions, electrons, and neutral gas molecules all reach similar high temperatures, making it suitable for applications like waste vitrification or high-temperature material synthesis that require intense, concentrated heat. Non-thermal (or non-equilibrium) plasma keeps electron temperature much higher than the surrounding gas temperature, generating highly reactive chemical species without significantly heating the bulk material. This distinction determines application fit: non-thermal plasma is preferred for treating heat-sensitive surfaces, polymers, or biological materials, while thermal plasma is selected when the process goal is bulk material transformation or destruction requiring substantial energy input.

In plasma-enhanced chemical vapor deposition, microwave-generated plasma provides the activation energy needed to decompose precursor gases at lower substrate temperatures than thermal CVD alone would require, which is essential for temperature-sensitive semiconductor substrates and multilayer structures. For plasma etching, the reactive ions and radicals generated by the microwave discharge selectively remove material from exposed surfaces with high directionality and minimal substrate damage when process parameters are properly tuned. Both applications depend on precise control over plasma density, gas chemistry, and substrate bias, which is why semiconductor-grade microwave plasma systems require tighter process control tolerances than general industrial surface treatment equipment.

Validation typically involves running multiple trial batches under nominally identical conditions and measuring the resulting surface or material properties to confirm tolerances are consistently met. Process parameters including microwave power, gas flow, pressure, and treatment time are logged for each trial run, allowing statistical analysis of variation sources before the recipe is locked for production. Optical emission spectroscopy is often used during this validation phase to confirm that plasma composition remains stable across repeated runs, since drift in reactive species concentration can indicate gas delivery or power supply issues that need correction before scale-up.

Microwave plasma is applied in waste gas treatment to break down volatile organic compounds and certain hazardous air pollutants into simpler, less harmful molecules through the reactive radical chemistry the plasma generates. It is also used in soil and water remediation contexts where contaminants need to be broken down without introducing additional chemical reagents. The non-thermal plasma variant is particularly useful here because it can drive oxidation reactions effectively without the high energy cost of heating the entire waste stream to combustion temperatures, making it a more energy-efficient option for treating dilute contaminant streams compared to thermal incineration.

Magnetron lifespan in continuous industrial duty typically ranges from several thousand to over ten thousand operating hours depending on power level, duty cycle, and cooling system performance, with solid-state generator alternatives generally offering longer service life at a higher upfront cost. Waveguide components and plasma chamber windows experience minimal wear under normal operation but should be inspected periodically for any coating deposition that could affect microwave transmission efficiency. Kerone provides expected service intervals for each major component as part of system documentation, allowing maintenance teams to plan replacement proactively rather than reactively after a failure interrupts production.