Ion-plasma treatment of reed switch contacts: A study by time-of-flight secondary ion mass spectrometry

Tolstogouzov, A.; Дроздов, М. Н.; Zeltser, I. A.; Arushanov, K.A.; Teodoro, O.M.N.D.

doi:10.1134/s1061934814130115

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…The duration of the single ion-plasma treatment was 30 s with 30 s pause between each single treatment, and the total number of such treatments was as high as 30. In that case, the reed switch is considered as a simple diode system, where blades act as electrodes (cathode and anode), and the glass bulb filled with nitrogen serves as a working chamber (for detail, see [6][7][8][9] and references cited therein).…”

Section: Resultsmentioning

confidence: 99%

“…The main difference of the prototype against a standard device is the absence of the goldruthenium electrodeposited coatings on the contact surfaces. Instead of those, nitrogen-containing iron/nickel coatings were fabricated directly in reed switches using pulsed ion-plasma treatment [6][7][8][9]. The contacts (blades) were pressed with vacuum-melt permalloy (Ni 52 wt %, Fe 48 wt %) wires by Dilaton™, degreased, and annealed in hydrogen atmosphere.…”

Section: Methodsmentioning

confidence: 99%

“…The surface erosion of magnetically operated hermetical contacts (reed switches or RS) [1] occurring under the commutation of electrical current is similar in many respects to the processes taking place in the course of explosive electron emission, arc and spark discharges [2,3], electrical discharge machining and doping [4,5], surface modification by pulse discharges [6][7][8][9], and high-intensity ion, plasma, and laser irradiation of materials [10,11]. There are currently no generally recognized models explaining these processes, since they occur under non-equilibrium conditions, in limited volumes, and during short time intervals.…”

Section: Introductionmentioning

confidence: 99%

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Surface Erosion of Low-Current Reed Switches

Zeltser

Karpov²,

Моос

et al. 2017

Coatings

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Abstract:The erosion model of the surface coatings of reed switches considering different physicochemical processes occurring on the contact surfaces and inside the inter-electrode gap was proposed. According to that, the discrete electron avalanche (ecton) introduced in the explosive electron emission theory by Mesyats is considered as the main motive force responsible for the surface modification and mass transfer of materials in the course of breaking/shorting of the contacts. By means of SEM imaging and energy dispersive X-ray microanalysis of the contact surfaces after various numbers of switching cycles, the energy threshold of the ecton generation defining the erosion stability of the coatings was found to be proportional to the specific sublimation and ionization energies of coating materials. It has been shown that the total erosion of the coatings on the working surface of the contacts after the commutation test possess the resultant character; i.e., the specificities of erosion occurring after each commutation event are characteristic for the whole of the commutation test. In further development of our model, we suggested that a few monolayers of metals (or alloys) with low ionization potential deposited on the main coatings can improve the erosion stability of contacts.

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Section: Resultsmentioning

confidence: 99%