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ELECTRICAL CONDUCTIVITY OF SELECTED ELEMENTS AND ALLOYS
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255KCamry Offline
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Post: #1
ELECTRICAL CONDUCTIVITY OF SELECTED ELEMENTS AND ALLOYS
THIS THREAD SHOULD BE SOME HELP TO SOME WHO ARE CONSIDERING WORKING OUT THE MATH IN HHO EFFICIENCY FOR THOSE SO INCLINED.

THE FIRST MEASUREMENT IS TAKEN DIRECTLY FROM THE ELEMENT CONDUCTIVITY TABLE FROM A CHEMISTRY TEXTBOOK AND IS ".000001 OHMS OF RESISTANCE PER CENTIMETER".

THE SECOND COLUMN IS USING SILVER (Ag) AS A REFERENCE, SINCE IT IS THE BEST CONDUCTOR AT ROOM TEMPERATURE AND IS READILY AVAILABLE ALTHOUGH EXPENSIVE. SILVER IS, FOR THIS TABLE, 100% AND ALL OTHER ELEMENTS HAVE THEIR VALUES DIVIDED INTO SILVER'S VALUE - MAKING IT A "PERCENT CONDUCTANCE IN RELATION TO SILVER". NOTE HOW IRON REALLY SUCKS COMPARATIVELY, BUT WE ALL KNOW THAT STAINLESS STEEL CONDUCTS RATHER WELL WHICH IS AT LEAST TWO-THIRDS IRON.

AFTER SOME ONLINE RESEARCHING, I HAVE FOUNS SOME VALUES FOR 5 DIFFERENT GRADES OF STAINLESS STEEL. IT SEEMS THE HIGHER THE Cr CONTENT, THE BETTER THE CONDUCTANCE AND RESISTIVITY TO CORROSION.

REMEMBER, THESE MEASUREMENTS ARE CALCULATED AT 20 DEGRESS CELSIUS OR 68 DEGREES FAHRENHEIT

HOPE THIS HELPS!!!!

SILVER 0.630 100 %
COPPER 0.590 93.6%
GOLD 0.452 71.7%
ALUMINUM 0.377 59.8%
[/color]
BERYLLIUM 0.313 49.7%
CALCIUM 0.298 47.3%
MAGNESIUM 0.226 35.9%
RHODIUM 0.211 33.5%
SODIUM 0.210 33.3%
IRIDIUM 0.197 31.3%
[/color]
ZINC 0.166 26.3%
NICKEL 0.143 22.7%
POTASSIUM 0.139 22.1%
CADMIUM 0.138 21.9%
RUTHENIUM 0.137 21.7%
INDIUM 0.116 18.4%
OSMIUM 0.109 17.3%
PLATINUM 0.097 15.4%
PALLADIUM 0.095 15.1%
IRON 0.093 14.8%[color=#FF0000]
size]


NOTE HOW TERRIBLE OF A CONDUCTANCE THESE STAINLESS STEELS HAVE COMPARED TO SILVER AND COPPER. THE DUPLEX (2205) AND UR52N+ STAINLESS STEELS CARRY CURRENT A WHOPPING 2% BETTER THAN 316.

SOMEONE MENTIONED USING 430 SS FOR ELECTRODES, BUT CONDUCTANCE IS MUCH LOWER WITH THIS MATERIAL.

WHAT ABOUT TUNGSTEN CARBIDE??????

THIS MATERIAL, BEING RELATIVELY NEW TO THE SCENE, IS NOT USED EXTENSIVELY IN ELECTRICAL APPLICATIONS OTHER THAN CVD. IT MELTS AT 5200 F AND IS THE HARDEST METAL ALLOY IN EXISTENCE AT THIS POINT.

AFTER SOME LENGTHY RESEARACH, I HAVE A RANGE OF CONDUCTIVITY VALUES RANGING FROM 0.07 TO 0.12, WHICH TRANSLATES INTO 9.5% T0 19% CONDUCTANCE COMPARED TO SILVER. I DON'T KNOW THE REASON FOR THE RANGE OTHER THAN THE TWO FORMS OF TUNGSTEN CARBIDE, WHICH ARE WC AND W2C.

MORE TO COME...
11-13-2008 04:35 PM
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255KCamry Offline
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Post: #2
RE: ELECTRICAL CONDUCTIVITY OF SELECTED ELEMENTS AND ALLOYS
OK, HAD A HICCUP; I DON'T LIKE THE WAY THAT GOT POSTED

HERE ARE THE STAINLESS STEEL AND WC VALUES, REVISED:

2205 DUPLEX SS 0.085 13.5%
UR52N+ 0.085 13.5%
316 SS 0.074 11.7%
304 SS 0.072 11.5%
430 SS 0.060 9.5%
TUNGSTEN CARBIDE 0.07-0.12 11.1 - 19.1%
11-13-2008 04:52 PM
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benny Offline
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Post: #3
RE: ELECTRICAL CONDUCTIVITY OF SELECTED ELEMENTS AND ALLOYS
255KCamry Wrote:OK, HAD A HICCUP; I DON'T LIKE THE WAY THAT GOT POSTED

HERE ARE THE STAINLESS STEEL AND WC VALUES, REVISED:

2205 DUPLEX SS 0.085 13.5%
UR52N+ 0.085 13.5%
316 SS 0.074 11.7%
304 SS 0.072 11.5%
430 SS 0.060 9.5%
TUNGSTEN CARBIDE 0.07-0.12 11.1 - 19.1%

Choice of metals is a trade off between which have low electrical resistance, and which have resistance to corrosion.
Keep in mind that using different metals as electrodes, with electrolyte, this includes plates, in the same generator, will have a similar effect to a dry cell battery producing electrical potential between the electrodes.
Remember the lemon battery from school science class?
11-14-2008 02:10 AM
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