Carbon
carbon has negative temperature coficient so its resistance decrease with the rise of temperature in contrast of copper....carbon has has lubrication property so it offered less friction as compared to copper....
You can specify a use for it.
Carbon is much stronger and because the motor commuter is spinning copper brushes will wear off quickly.
The brushes are made up of carbon because it has low friction as compare to other materials and cheaply also, but carbon has high resistance due to which output can vary. So we mix carbon with copper metal to reduce resistance. Note that we cannot use copper only for brushes because it creates more friction with commutator.
It is possible for carbon dioxide and copper oxide to encourage a reaction to take place due to thermal composition. When calcium carbonate is heated, it decomposes and generates carbon dioxide and copper oxide.
Carbon + Copper oxide -> Copper + Carbon dioxide
Copper 99%
it isn't logical to remove the starter, dissasemble it, and attempt to fix it. if you are going to do that much work....REPLACE IT. "isn't logicial" what are you nuts!! it takes two little(but long) bolts to take a starter apart and a whole 20 minuets to replace the brushes. why the hell would you pay 100-200 for a "referbished" starter; or god help you 250+ for a brand new one when the brushes cost 10-30$. just make sure it is the brushes and not the drive gear(look for pits in the copper lines) those things tend to get expensive, usually as much as a referbished unit. ~isn't logicial LOL i bet that guy works for the government~ The best place to buy starter/alternator rebuild kit(or individual pieces) are repair shops/electrical stores that deal only with starters and/or alternators **My starter for my gmc 2500 was only $30 at Auto zone....all shiny
Copper has more protons than carbon. Copper has 29 protons while carbon has 6 protons.
how much copper is in copper wire
Heating copper oxide with carbon (in the form of coal or charcoal) causes a reduction reaction, where carbon removes oxygen from copper oxide to produce carbon dioxide and leave behind pure copper. This process is known as a reduction reaction, where carbon acts as a reducing agent to extract copper from its oxide form.
Copper doesn't react with carbon dioxide at room temperature.