Dynamic Contact Resistance and Film Thickness of Relay Contacts Coated with Fluoropolymer Thin Films

Relay contacts were coated with two different fluoropolymer barrier solutions with 0.I wt% of the fluoropolymer poly-1H, 1Hpentadecafluoroctyl methacrylate (PFOMA) as the common solute. The solvent for the first solution (PFOMA-1) was 1,1,1-trichloro-l,2,2trifluoroethane (TCTFE), and the solvent for...

Full description

Saved in:
Bibliographic Details
Published inIEEE transactions on components, hybrids, and manufacturing technology Vol. 7; no. 1; pp. 76 - 80
Main Authors Haque, C., Uhrig, T.
Format Journal Article
LanguageEnglish
Published New York, NY IEEE 01.01.1984
Institute of Electrical and Electronics Engineers
Subjects
Applied sciences
Chromium
Coatings
Contact resistance
Electric connection. Cables. Wiring
Electrical engineering. Electrical power engineering
Exact sciences and technology
Petroleum
Relays
Solvents
Springs
Thickness measurement
Transistors
Various equipment and components
Wire
Relay
Solid dielectric
Electric contact
Plastics
Dielectric coating
Resistor
Thin film
Varnish
Online AccessGet full text

Cover

More Information
Summary:Relay contacts were coated with two different fluoropolymer barrier solutions with 0.I wt% of the fluoropolymer poly-1H, 1Hpentadecafluoroctyl methacrylate (PFOMA) as the common solute. The solvent for the first solution (PFOMA-1) was 1,1,1-trichloro-l,2,2trifluoroethane (TCTFE), and the solvent for the second (PFOMA-2) was a mixture of 90 percent perfluorocyclic ether plus 10 percent TCTFE. Four modes of contact resistance behavior were observed when the dynamic closing contact resistance of these barrier-coated contacts was measured during their first 100 contact closures. These modes were 1) low stable resistance throughout (100-150 m \Omega ) 2) low stable resistance except for a periodic high resistance (150-<200 m \Omega ) 3) initial high resistance (>200 m \Omega ) that stabilizes to low stable resistance after a certain number of operations (2-48); and 4) high resistance throughout (> 1 \Omega ). Ninety-five percent of the PFOMA-2 coated contacts had desirable contact resistance performance defined by behavior modes 1 and 2. Only 65 percent of the PFOMA-1 coated contacts were in modes 1 and 2 while 30 percent were in mode 3. The average thickness of the barrier coat film was 136 Å for 0.1 percent PFOMA-2 and 167 Å for 0.1 percent PFOMA-1 within a range of ± 15 Å.
ISSN:0148-6411
1558-3082
DOI:10.1109/TCHMT.1984.1136334