ASTM D6120-97(2012)
(Test Method)Standard Test Method for Electrical Resistivity of Anode and Cathode Carbon Material at Room Temperature
Standard Test Method for Electrical Resistivity of Anode and Cathode Carbon Material at Room Temperature
SIGNIFICANCE AND USE
5.1 The electrical resistivity of anode and cathode carbon material is important for efficient aluminum cell operation. It is a quality parameter that determines the suitability of an anode/cathode for operation in an aluminum cell.
5.2 The electrical resistivity may be selected as a requirement in a customer specification.
SCOPE
1.1 This test method covers the determination of the electrical resistivity at room temperature of solid cylindrical specimens cored from commercial sized carbon anodes and cathodes. This test method also applies to samples from carbon blocks prepared in a laboratory.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitation prior to use. For specific warning information, see 8.2.3.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D6120 − 97 (Reapproved 2012)
Standard Test Method for
Electrical Resistivity of Anode and Cathode Carbon Material
at Room Temperature
This standard is issued under the fixed designation D6120; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope path, the reciprocal of conductivity. It is also known as
resistivity, or specific resistance.
1.1 This test method covers the determination of the elec-
trical resistivity at room temperature of solid cylindrical
4. Summary of Test Method
specimens cored from commercial sized carbon anodes and
4.1 An electrical current is passed through a carbon cylinder
cathodes.This test method also applies to samples from carbon
and the voltage drop or electrical resistance is measured
blocks prepared in a laboratory.
between two points along its length. The resistivity is calcu-
1.2 The values stated in SI units are to be regarded as
latedbasedonthevoltagedroporelectricalresistance,distance
standard. No other units of measurement are included in this
between the two points, and the cross-sectional area of the
standard.
cylinder.
1.3 This standard does not purport to address all of the
4.2 This test method are used to determine electrical resis-
safety concerns, if any, associated with its use. It is the
tivity for various carbon materials typically found in the
responsibility of the user of this standard to establish appro-
aluminum industry. Electrical resistivity of other carbon arti-
priate safety and health practices and determine the applica-
facts such as graphite and specialty carbons is more appropri-
bility of regulatory limitation prior to use. For specific warning
ately determined by Test Method C611.
information, see .
5. Significance and Use
2. Referenced Documents
5.1 The electrical resistivity of anode and cathode carbon
2.1 ASTM Standards: material is important for efficient aluminum cell operation. It is
a quality parameter that determines the suitability of an
C611 TestMethodforElectricalResistivityofManufactured
anode/cathode for operation in an aluminum cell.
Carbon and Graphite Articles at Room Temperature
D5502 Test Method for Apparent Density by Physical Mea-
5.2 The electrical resistivity may be selected as a require-
surements of Manufactured Anode and Cathode Carbon
ment in a customer specification.
Used by the Aluminum Industry
6. Apparatus
3. Terminology
6.1 Specimen Holder (Fig. 1), a device for holding a
specimen of 50 mm diameter and a minimum of 120 mm in
3.1 Definitions:
length between two flat copper plates. One of the plates is
3.1.1 electrical resistivity, n—the electrical resistance of-
swivel mounted to ensure good contact in case the ends of the
fered by a material to the flow of current, times the cross-
specimen are not perfectly parallel. The plates shall be as large
sectional area of current flow and per unit length of current
astheendsofthespecimenandelectricallyinsulatedfromeach
other.
6.1.1 Voltage Drop Contact Points—The contact points
shall be conical or knife edge in shape and securely fastened to
This test method is under the jurisdiction of ASTM Committee D02 on rigid insulating material with a minimum spacing of 50 mm
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
and a maximum spacing of 80 % of the length of the specimen.
SubcommitteeD02.05onPropertiesofFuels,PetroleumCokeandCarbonMaterial.
The distance (L) in millimetres (mm) between the center of the
Current edition approved Nov. 1, 2012. Published December 2012. Originally
conical points or knife edges is used when calculating the
approved in 1997. Last previous edition approved in 2007 as D6120– 97(2012).
DOI: 10.1520/D6120-97R12.
electrical resistivity.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Parker, Sybil P., Ed in Chief, Dictionary of Scientific and Technical Terms,
the ASTM website. McGraw Hill Book Co., Fourth Ed., 1989, p 615.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6120 − 97 (2012)
7.3 Ascertainbyvisualinspectionthatalledgesandfacesof
the specimen are free of chips or gouges. Ensure that the
specimen is free of residue from the coring and sawing
operations.
7.4 Dry the specimen for a minimum of 2 h at 100°C; then
allow to it to cool to 22 6 5°C in a dessicator. Store the
specimen in a dessicator until immediately prior to testing.
8. Procedure
8.1 Test at 22 6 5°C.
8.2 Indirect Resistance Measurement:
8.2.1 Mount the test specimen in the holder and tighten
contact plates firmly to the ends of the specimen.
8.2.2 Apply voltage and adjust current to about 6 amps 6 3
A.
8.2.3 Center the contact points longitudinally on top of this
FIG. 1 Schematic of Specimen Holder
specimen and measure the voltage drop. Move the contact
points around the circumference of the cylinder a distance
equivalent to an arc length of the circumference subtended by
a45°angle.Makesurecontactsarestilllongitudinallycentered
6.2 Apparatus for Indirect Resistance Measurement—
and take a voltage reading. Continue moving in the same
(permits measurement of voltage and current needed for
directionaroundthecircumferenceuntilatotalofeightequally
calculating electrical resistivity):
spaced voltage readings are recorded. (Warning—Passing a
6.2.1 dc Power Supply—The power supply shall be capable
current through a test specimen for an extended period of time
of supplying a minimum dc current of 10 amps at an electrical
can increase the temperature and consequently lower the
potential of up to 5V.The line and load regulation shall be less
resistance of the specimen.)
than 0.1 % and background noise less than or equal to 0.1 %.
8.3 Direct Resistance Measurement:
6.2.2 dc Voltage Measuring Instrument, high-impedance
8.3.1 Mount the test specimen in the holder and tighten
device capable of measuring a minimum of 5 V to 0.01 mV.
contact plates firmly to the ends of the specimen.
6.2.3 dc Current Measuring Device, a device capable of
8.3.2 Center the contact poi
...
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