Graphite on switches

Graphite on switches

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Thread: Graphite on switches

  1. #1
    Join Date
    May 2013
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    Default Graphite on switches

    Dryer
    Dbxr463ed2ww
    Didn't have a new door switch (we4m126) for this dryer, so I took it apart and cleaned the contacts. Didn't pay a lot of attention to the graphite on the contacts. One set was stuck. Must have been the light circuit as the dryer would not run until I cleaned the contacts.
    My question is, is the purpose of the graphite to keep the copper contacts from, in effect, welding/sticking to each other?
    Have some new ones on order.
    Last edited by jeff1; 02-15-2018 at 10:02 PM.

  2. #2
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    A copy:

    Because the structure of the metal and its free valence electrons has a lot to do with how well it conducts electricity, some metals are better than it than others. While nearly all metals and graphite can conduct electricity, some have a better atomical structure for doing so. Gold or silver, for example, is structured in a way so that many of its free electrons can roam quickly, making it a very good conductor of electricity. Since gold is so expensive, it is not often that it is used in this manner. Thus, copper and graphite take its place as a conductor. Graphite is not as good a conductor as copper, but it is relatively cheap and thus, more and more products are being used which utilize the unique conduction properties of graphite.

    A guess:

    The graphite may also help prevent the contacts from arcing when they open and close.

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  3. #3
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    The arcing is what I am concerned about causing the contact copper to copper ends welding/sticking together.
    If I knew it would work, I would try to rebuild the contact points with silver solder out of curiosity.
    Thanks Jeff.

  4. #4
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    Silver and Gold is sooooooo expensive today.
    Copper, brass are not much cheaper any more.
    The quicker the contacts open the less spark or arcing will occur.

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  5. #5
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    Really not sure ehat these contact points are. They are silver colored.

  6. #6
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    My guess is polished steel...esp if the contacts are hard...the other metals are much softer.

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

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