An Experimental Study on Influences of Silicon-Type and Non-Silicone-Type Polymeric Cured Materials on Contact Resistance Characteristics of Relay Contacts

Hasegawa, Makoto; Kohno, Yoshiyuki; Ando, Hiroshi

doi:10.1109/holm.2009.5284390

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…Longer operating intervals were believed to induce increased amount of vapors absorbed onto the contact surface. On the other hand, the nonsilicone-type polymeric material did not show such adverse effects on the contact resistance characteristics even at 0.5 Hz, confirming its advantages [14].…”

Section: Introductionmentioning

confidence: 57%

“…The authors are investigating influences of this material (more specifically, its vapors) on contact resistance characteristics of mechanical relays, and the results are being compared with those with silicone-containing polymeric materials [9][10][11][12][13][14]. For example, in the operating tests of relays to break an inductive load current of DC 14V-1A (L=20mH) at 120 ºC with an operating frequency of 1 Hz, the conventional silicone-containing material led to deterioration of contact resistance characteristics, even when the material was of a counter-measure type against contact failures, as shown in Fig.1.…”

Section: Introductionmentioning

confidence: 99%

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Contact Resistance Characteristics of Relay Operated in the Vicinity of Silicone-Type and Non-Silicone-Type Polymeric Cured Materials at Elevated Temperatures

Hasegawa

Kohno

2010

2010 Proceedings of the 56th IEEE Holm Conference on Electrical Contacts

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Influences of vapors evaporated from a newlydeveloped acryl-based polymeric material (containing no silicone components) and conventional silicone-containing polymeric materials were evaluated with respect to their effects on contact resistance characteristics of relay contacts at an ambient temperature of 120ºC. More specifically, a commerciallyavailable mechanical relay (AgSnIn contacts) was sealed into a can with one of the two materials, and placed in a heating chamber to operate, at an operating frequency of 0.5 Hz, 40,000 break operations of an inductive DC14V-0.4A load current, an inductive DC5V-1A load current, or a resistive DC14V-1A load current. Contact resistance values were measured at every 50 operations, and compared with the results obtained in the similar operation tests conducted at an operating frequency of 1 Hz. As a result, the relays sealed with the acryl-based non-silicone-type polymeric material showed no deterioration in contact resistances, irrespective of the load conditions or operating frequencies. On the other hand, the relays sealed with the silicone-containing material showed more significant deteriorations and fluctuations of the contact resistance characteristics in the 0.5 Hz operations as compared with the cases of the 1 Hz operations.

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Section: Introductionmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Contact Resistance Characteristics of Relay Operated in the Vicinity of Silicone-Type and Non-Silicone-Type Polymeric Cured Materials at Elevated Temperatures

Hasegawa

Kohno

2010

2010 Proceedings of the 56th IEEE Holm Conference on Electrical Contacts

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“…The authors have been already reported some experimental results on influences of this acryl-based non-silicone-type polymeric material on contact resistance characteristics of a mechanical relay in comparison with those with conventional silicone-containing polymeric materials at elevated ambient temperatures of, such as, 80ºC and 120ºC [9][10][11][12][13]. In this paper, results obtained up to now, including previously reported data, are summarized in order to demonstrate advantages of the acryl-based non-silicone-type polymeric material over the conventional silicone-containing materials.…”

Section: Introductionmentioning

confidence: 99%

Contact Resistance Characteristics of Relays Operated in Silicone-Vapor-Containing and Non-Silicone Atmospheres with Different Electrical Load Conditions

Hasegawa

Kobayashi

Kohno

2011

2011 IEEE 57th Holm Conference on Electrical Contacts (Holm)

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Influences of vapors evaporated from an acryl-based non-silicone-type polymeric cured material and conventional silicone-containing polymeric cured materials were evaluated with respect to their effects on contact resistance characteristics of relay contacts at an ambient temperature of 120ºC. More specifically, a commercially-available mechanical relay (AgSnIn contacts) was sealed into a metal can with one of these materials, and placed in a heating chamber to operate, at an operating frequency of 0.5 Hz, 40,000 break operations of an inductive DC 14V-1A, 14V-0.4A, 10V-1A, 5V-1A load currents, or a resistive DC 14V-1A load current. Contact resistance values were measured at every 50 operations. As a result, the relays sealed with the acryl-based non-silicone-type polymeric cured material showed no deterioration in contact resistances, irrespective of the load conditions. On the other hand, the relays sealed with the silicone-containing polymeric cured materials showed more significant deteriorations and fluctuations of the contact resistance characteristics, and certain influences of load conditions on their behaviors were recognized.

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“…The presence of Silicone in the contact area has therefore to be prevented in general. Different approaches for this goal are: complete removal of silicone materials from manufacturing of the switchgear throughout the product life within the application [18]; use of adequate silicone replacements [22][23][24]; or testing and approval of each silicone material in respect of its content of volatile Silicone and contact compatibility [4]. The aim of this work is to study the capability of relay housings to act as Silicone barriers: Relays with plastic housings with different sealing ratings were put into Silicone environments.…”

Section: Introductionmentioning

confidence: 99%

Reliability of hermetically sealed miniature relays in silicone-rich environments

Schrank¹

2012

26th International Conference on Electrical Contacts (ICEC 2012)

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Organic Silicone materials such as Polydimethylsiloxanes (PDMS) are well-known for more than 60 years to affect the performance of devices with arcing contacts such as switches, relays or motors: liquid or volatile parts of the silicone materials can overcome long distances and penetrate through small gaps and are eventually transformed on contact surfaces within electrical arcs into inorganic silicon-dioxide which is an excellent electrical isolator. Even very small concentrations of silicone can be critical to the performance of the switching devices. Therefore the use of silicone materials is nowadays restricted in applications with switching contacts. Nevertheless silicone related failures of switchgear still occur since the relevance of these phenomena is often underestimated. The first part of this work gives therefore a detailed review of more than 60 years of silicone-related research. In the experimental part of this work relay housings with different sealing categories were investigated regarding their ability to act as reliable barriers: Silicone materials with high and low volatile contents were used within switching experiments in order to determine how reliable i) open, ii) sealed and iii) hermetically sealed relays can be operated within differently saturated silicone ambient. Contact resistance was evaluated as first criteria and after the tests contact surfaces were analyzed using scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX) in order to verify silicone contamination.

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An Experimental Study on Influences of Silicon-Type and Non-Silicone-Type Polymeric Cured Materials on Contact Resistance Characteristics of Relay Contacts

Cited by 4 publications

References 5 publications

Contact Resistance Characteristics of Relay Operated in the Vicinity of Silicone-Type and Non-Silicone-Type Polymeric Cured Materials at Elevated Temperatures

Contact Resistance Characteristics of Relay Operated in the Vicinity of Silicone-Type and Non-Silicone-Type Polymeric Cured Materials at Elevated Temperatures

Contact Resistance Characteristics of Relays Operated in Silicone-Vapor-Containing and Non-Silicone Atmospheres with Different Electrical Load Conditions

Reliability of hermetically sealed miniature relays in silicone-rich environments

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