Projects / Programmes source: ARIS

Interaction between fully dissociated moderately ionized ammonia plasma and glass-fiber reinforced polymers

Research activity

Code Science Field Subfield
2.09.00  Engineering sciences and technologies  Electronic components and technologies   

Code Science Field
P240  Natural sciences and mathematics  Gases, fluid dynamics, plasmas 

Code Science Field
2.02  Engineering and Technology  Electrical engineering, Electronic engineering, Information engineering 
commutator, glass-filled polymer composite, ammonia plasma, comparative tracking index
Evaluation (rules)
source: COBISS
Researchers (12)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  22289  PhD Uroš Cvelbar  Electronic components and technologies  Researcher  2014 - 2017  730 
2.  18635  Tatjana Filipič    Technical associate  2014 - 2017  24 
3.  34439  PhD Gregor Jakša  Electronic components and technologies  Researcher  2014 - 2016  37 
4.  15703  PhD Janez Kovač  Electronic components and technologies  Researcher  2014 - 2017  680 
5.  21019  Ludvik Kumar  Manufacturing technologies and systems  Researcher  2014 - 2017  22 
6.  27730  Andrej Likar  Manufacturing technologies and systems  Researcher  2015 - 2016 
7.  10429  PhD Miran Mozetič  Electronic components and technologies  Head  2014 - 2017  1,356 
8.  06527  Branko Petrič  Electric devices  Researcher  2014 - 2017  23 
9.  25003  MSc Goran Serafimović  Systems and cybernetics  Researcher  2017 
10.  17622  Janez Trtnik    Technical associate  2014 - 2017  18 
11.  20048  PhD Alenka Vesel  Electronic components and technologies  Researcher  2014 - 2017  695 
12.  31618  PhD Rok Zaplotnik  Electronic components and technologies  Researcher  2014 - 2017  313 
Organisations (3)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  91,408 
2.  1682  KOLEKTOR MOBILITY Upravljanje naložb d.o.o. (Slovene)  Idrija  5034558  250 
3.  2341  INDUKTIO L.t.d.  Ljubljana  1840711  23 
Systematic research on interaction of ammonia gaseous plasma with composite materials will be performed in order to improve the long-term performance of electrical devices with glass-reinforced polymer insulation. The comparative tracking index (CTI) will be increased dramatically by selective removal of surface polymer layer and will approach values typical for glasses. Plasma will be created by electrode-less inductively coupled RF discharge and suitable surface effects will be achieved by optimization of the ratio between fluxes of neutral and charged reactive gaseous particles onto composite materials. Systematic research on optimization of plasma coupling, generation of reactive particles, interaction of particles with composite materials and characterization of plasma-treated materials will allow for drawing correlations between applied processing parameters and CTI index. The results will represent a solid background for later development of a large-scale reactor suitable for application in massive production thus increasing the quality of rotors used in numerous products from washing machines to gasoline pumps in vehicles.
Significance for science
The paper entitled "E- and H-mode transition in a low pressure inductively coupled ammonia plasma" represents the first report worldwide on behaviour of ammonia plasma at transitions between the two distinguished modes Characteristics of ammonia plasma sustained by inductively coupled radiofrequency discharge has been studied in the range of powers between 50 and 1000 W and pressures between 10 and 90 Pa. In such an experimental setup pronounced differences between the E- and H-mode were observed and explained to some details. Plasma was characterized by optical emission spectroscopy (OES) and residual gas spectrometry (RGA). The plasma luminosity changed for 4 orders of magnitude and the NH2 band vanished at higher powers (H-mode). The RGA results indicated high density of NH2 radicals in the E-mode whilst in the H-mode the ammonia molecules almost entirely dissociated to H and N atoms. The N and H atoms created in the plasma recombined to the nitrogen and hydrogen molecules rather than to parent ammonia molecules on the way to the RGA. In the paper "Tackling chemical etching and its mechanisms of polyphenolic composites in various reactive low temperature plasmas" we presented our own hypothesis on interaction of different plasmas with such composites. Inductively coupled low temperature plasma discharge was verified to facilitate chemical etching to selectively remove the surface polymer from the glass filled polyphenolic composite. The etching rate inside the plasma was compared with commercially important feeding gases including H2, N2, O2 and NH3 as a function of discharge power. The protruding surface polymer was removed in volatile molecular fragments, whereas the glass additives stayed unaffected. The etching rate is shown to increase as a function of applied power inside all used gas discharges. Irrespective of the applied power, O2 plasma displayed the highest etching rate. Furthermore, by combining optical emission spectroscopy (OES) and X-ray photoelectron spectroscopy (XPS) analyses, the work is extended to mechanistically present the possible chemical pathways which lead to creation of various functional groups on the surface during the plasma–surface interactions.
Significance for the country
The scientific results and knowledge gained within this project represent a solid background for upscaling and possible development of an industrial line for application of the plasma technology in mass production. The decision about commercialization depends on the economic factors (cost of investment and processing costs) as well as global market situation. The key objective of this project was a fair estimation of technological feasibility and this objective was achieved. The CTI index of prototypes treated according to the innovative technology elaborated within the project was improved dramatically and upscaling is feasible.
Most important scientific results Annual report 2014, 2015, final report
Most important socioeconomically and culturally relevant results Annual report 2014, 2015, final report
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