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Frame ID: G01
Frame ID: G01
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 50x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Intergrowths of graphite crystals in Ceylon lump graphite
Description: The different colored areas are of natural graphite at different optical orientations. Note the nature of the crystal intergrowths.
Frame ID: G02
Frame ID: G02
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 50x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Coarse flake graphite
Description: The natural graphite flakes are seen in cross-section. They are isotropic except where strain has introduced anistropy.
Frame ID: G03
Frame ID: G03
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 50x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Coarse flake graphite
Description: The natural graphite flakes are seen in cross-section. They are isotropic except where strain has introduced anistropy. Note the well developed layering.
Frame ID: G04
Frame ID: G04
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 20x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Filler and binder phases in nuclear graphite
Description: This frame shows a typical pile grade moderator graphite. The large particle is filler phase needle coke set in a finer grained binder phase. The dark areas are pores. This graphite is anistropic.
Frame ID: G05
Frame ID: G05
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 20x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Filler coke in nuclear graphite
Description: This sample is a fine-grained moderator graphite with filler phase of spherical particles of Gilsocarbon (a carbon produced by heat treating gilsonite which is a naturally occurring solid hydrocarbon). The spherical shape of the gilsocarbon and the fine-grained binder phase give this graphite isotropic properties.
Frame ID: G06
Frame ID: G06
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 50x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Fine-grained nuclear graphite
Description: This frame shows a fine-grained sleeve graphite with isotropic properties due to the fine size of the filler coke.
Frame ID: G07
Frame ID: G07
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 50x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Filler coke in graphite crucible
Description: The large fragment in the center of the frame is needle coke as a filler phase set in a coarse- grained binder phase. This sample is typical of graphite used in laboratory crucibles.
Frame ID: G08
Frame ID: G08
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 50x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Fine-grained graphite
Description: This frame shows a very fine-grained sleeve graphite with isotropic properties due to the fine size of the filler coke.
Frame ID: G09
Frame ID: G09
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 5x air
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter: None
Important Features: Graphite anode paste
Description: This frame shows two pellets of green anode paste. Note the large petroleum coke fragment in the core of each pellet surrounded by finer coke particles and pitch.
Frame ID: G10
Frame ID: G10
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 10x air
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter: None
Important Features: Green anode paste
Description: This frame shows two pellets of green anode paste that have coalesced. Again, note the large petroleum coke fragment in the core of each pellet surrounded by finer coke particles and pitch.
Frame ID: G11
Frame ID: G11
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 10x air
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter: None
Important Features: Graphite anode paste
Description: This frame shows two pellets of green anode paste that have coalesced. The large particle at the lower right is petroleum coke and the large particle at the top left is a recycled fragment of used anode material. Note the differences between these two fragments.
Frame ID: G12
Frame ID: G12
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 10x air
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter: None
Important Features: Green anode paste
Description: This frame shows an area of green anode paste at the left and some sponge coke at the right.
Frame ID: G13
Frame ID: G13
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 10x air
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter: None
Important Features: Graphite anode paste
Description: This frame shows two pellets of green anode paste that have coalesced. There is a large particle of petroleum coke at the left and an anode butt fragment on the right. The zone in the middle has an excess of void space due to a lack of pitch. Note the elongate shape of the voids. This area is a zone of weakness.
Frame ID: G14
Frame ID: G14
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 10x air
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter: None
Important Features: Green anode paste
Description: This frame shows two pellets of green anode paste that have coalesced. There are large particles of petroleum coke at the left and right. The zone in the middle has an appropriate amount of void space that indicates that this mix has been properly pitched.
Frame ID: G15
Frame ID: G15
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 10x air
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter: None
Important Features: Graphite anode paste
Description: This frame shows a typical green anode paste with petroleum coke fragments of various sizes, but an excessive amount of pitch.
Frame ID: G16
Frame ID: G16
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 10x air
Polarizer: In
Analyzer: In
Retarder Plate: Out
Filter: None
Important Features: Green anode paste
Description: This frame is the same as B7, but with the polarizer and analyzer in. Note how the change in optical conditions enhances the identification of the various phases present.
Frame ID: G17
Frame ID: G17
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 10x air
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter: None
Important Features: Baked graphite anode
Description: This frame shows a typical baked anode with petroleum coke fragments at the top and bottom and carbonized pitch and finer coke fragments in the middle.
Frame ID: G18
Frame ID: G18
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 10x air
Polarizer: In
Analyzer: In
Retarder Plate: Out
Filter: None
Important Features: Baked graphite anode
Description: This frame is the same as C1, but with the polarizer and analyzer in. Note how the change in optical conditions enhances the identification of the various phases present.
Frame ID: G19
Frame ID: G19
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 10x air
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter: None
Important Features: Baked graphite anode
Description: This frame shows a typical baked anode with petroleum coke fragments but with an excess of pore space due to lack of pitch.
Frame ID: G20
Frame ID: G20
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 10x air
Polarizer: In
Analyzer: In
Retarder Plate: Out
Filter: None
Important Features: Baked graphite anode
Description: This frame shows a typical baked anode with petroleum coke fragments but with an excess of pore space due to lack of pitch. Note how the change in optical conditions enhances the identification of the various phases present.
Frame ID: G21
Frame ID: G21
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Baked graphite anode
Description: This frame shows a typical baked anode with petroleum coke fragments (some needle coke) but with an excess of pore space due to lack of pitch.
Frame ID: G22
Frame ID: G22
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Baked graphite anode
Description: This frame shows a typical baked anode with petroleum coke fragments. Note the good bonding of the coke fragments on the left and the poor bonding on the right.
Frame ID: G23
Frame ID: G23
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Baked graphite anode
Description: This frame shows a typical baked anode with medium sized petroleum coke fragments.
Frame ID: G24
Frame ID: G24
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Baked graphite anode
Description: This frame shows a typical baked anode with petroleum coke fragments. Note the good bonding of the coke fragments.
Frame ID: G25
Frame ID: G25
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Baked graphite electrode
Description: This frame shows a typical baked electrode with petroleum coke fragments.
Frame ID: G26
Frame ID: G26
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Baked graphite electrode
Description: This frame shows a typical baked electrode with large fragments of needle coke.
Frame ID: G27
Frame ID: G27
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Baked graphite electrode
Description: This frame shows a typical baked electrode with petroleum coke fragments. Note the good bonding of the coke particles.
Frame ID: g28
Frame ID: G28
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Baked graphite electrode
Description: This frame shows a typical baked electrode with petroleum coke fragments. Note the good bonding of the coke particles.
Frame ID: G29
Frame ID: G29
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Baked graphite electrode
Description: This frame shows a baked electrode with petroleum coke fragments with excessive pore space due to insufficient binder pitch.
Frame ID: G30
Frame ID: G30
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Baked graphite electrode
Description: This frame shows a baked electrode with petroleum coke fragments at the top and a graphatized recycled electrode fragment at the bottom.
Frame ID: G31
Frame ID: G31
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Baked graphite electrode
Description: This frame shows a typical baked electrode with petroleum coke fragments (large pieces of needle coke). Note the parallel cracks along the long axis of the coke particles and the good bonding on the end of the same particles.
Frame ID: G32
Frame ID: G32
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Baked graphite electrode
Description: This frame shows a baked electrode with petroleum coke fragments that are well bonded.
Frame ID: G33
Frame ID: G33
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Graphatized graphite electrode
Description: This frame shows a typical graphatized electrode with petroleum coke fragments and anthracite (large pink fragment). The small yellow spots on the anthracite are vapor deposited carbon.
Frame ID: G34
Frame ID: G34
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Graphatized graphite electrode
Description: This frame shows a typical graphatized electrode with petroleum coke fragments and anthracite (green fragment).
Frame ID: G35
Frame ID: G35
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Graphatized graphite electrode
Description: This frame shows a typical graphatized electrode with petroleum coke fragments and anthracite (green fragment).
Frame ID: G36
Frame ID: G36
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Graphatized graphite electrode
Description: This frame shows a working face of a graphatized electrode. The needle-like crystals are silicon carbide and the hexagonal crystals are quartz.
Frame ID: G37
Frame ID: G37
Sample ID: Graphite
Magnification: As given
Illuminator: Vertical
Objective: 25x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Graphatized graphite electrode
Description: This frame shows a graphatized electrode with anthracite (pink fragments). The yellow spots are vapor deposited carbon.