Isostatic graphite

ISOSTATIC GRAPHITE

1 It is produced from a mixture of coke and pitch by means of isostatic molding, followed then by heat-treating the blank to a temperature of 2500-2800 °C.

2 It is designed to meet the strict requirements for materials used in advanced equipment production.

3 It is able to replace traditional types of structural graphite, featuring increased service life and performanc.

COMPARISON OF STRUCTURAL GRAPHITE BLANK MOLDING METHODS

PIERCING MOLDING (GMZ)

  • High Performance
  • Large Blank Dimensions
  • Low Product Durability
  • High Property Anisotropy (dependent on orientation)

BLANK DIE MOLDING (MPG, ARV, MGZ)

  • Increased Product Durability
  • Fine Grain Size
  • Small Blank Dimensions
  • Property Anisotropy (dependent on orientation)
  • Low Performance

ISOSTATIC MOLDING (IG-1S, IG-2H)

  • High Product Durability
  • Large Blank Dimensions
  • Fine Grain Size
  • Isotropy of Properties (not dependent on orientation)
  • Low Performance

ANISOTROPY OF GRAPHITE PROPERTIES

NON-ISOSTATIC GRAPHITE





Preferred molding direction



Molding axis





The properties of blanks, and the products made from them, depend on their orientation


The durability and electrical conductivity perpendicular to the molding axis are lower

ISOSTATIC GRAPHITE





No preferred molding direction


No molding axis





The properties of the blanks and products made from them DO NOT depend on orientation


Durability and electrical conductivity are the same regardless of orientation

APPLICATION

MECHANICAL ENGINEERING, GLASS PRODUCTION

Molding type
ISOSTATIC IG-2H
IG-1S
BLANK
DIE
MPG-7
ARV, MG
PIERCING GMZ
Bulk density, g/cm3
Porosity, %
Average filler grain size, µm

Advantages of isostatic graphite:

  • High density
  • Fine grain size
  • A previously unattainable surface finish and a complex product geometry
  • Increased chemical and oxidative resistance
  • Increased chemical and oxidative resistance

APPLICATION

VACUUM FURNACES, METALLURGY

Molding type
ISOSTATIC IG-2H
IG-1S
BLANK
DIE
MPG-7
ARV, MG
PIERCING GMZ
Compressive strength, MPa
Specific electrical resistance, µΩ•m

Advantages of isostatic graphite:

  • Electrical resistance, durability, and other properties do not depend on orientation
  • The possibility to produce 3D heaters for vacuum furnaces
  • Increased chemical and oxidative resistance
  • High thermal shock resistance
  • Low abrasion and long service life

APPLICATION

MECHANICAL ENGINEERING, METALLURGY, CHEMICAL INDUSTRY

Molding type
ISOSTATIC IG-2H
IG-1S
BLANK
DIE
MPG-7
ARV, MG
PIERCING GMZ
Compressive strength, MPa
Specific electrical resistance, µΩ•m

Advantages of isostatic graphite:

  • The production of large-sized products with thin walls or complex shapes
  • Increased service life of products operating under high load
  • High thermal stability

COMPARISON OF ISOSTATIC GRAPHITE WITH TRADITIONAL GRAPHITE TYPES



Indicators Piercing molding graphite BLANK die molding Isostatic graphite
GMZ ARV, MG MPG-7 IG-1S IG-2H
// / // /
Maximum blank dimensions, mm Ø500×1800 Ø200×500 200²×100 Ø600×1200
Bulk density, g/cm³ 1,68–1,88 1,70–1,78 1,70–1,80 1,72–1,77 1,75–1,80
Compressive strength, MPa 30–50 25–45 40–65 37–60 65–90 45–60 80–100
Flexural Strength, MPa 12–25 10–18 15–25 13–20 35–50 25–35 40–50
Ash content, % 0,01–0,02 0,01–0,02 0,01–0,25 0,01–0,02
Specific electrical resistance, µΩ•m 5–8 6–9 9–16 10–18 12–18 12–16 14–18
Average filler grain size, µm 130 50 40 50 25
Porosity, % 20–18 18–23 12–15 18–20 16–19

PRECISION OF PRODUCTION TECHNOLOGY

ISOSTATIC GRAPHITE PRODUCTION IS CHARACTERIZED BY:

1 Strict requirements as to the quality of raw materials;

2 Close compliance with process parameters and component dosage;

2 The use of advanced equipment.
The control of each blank throughout the entire production cycle using advanced control methods.

ADVANTAGES:

1 High stability of graphite properties;

2 Extremely low shipment probability of a product with hidden flaws.

CONCLUSIONS:

1 It Is possible to manufacture large batches of graphite products with stable properties;

2 It is possible to manufacture products meeting increased requirements for uptime.

QUALITY ANALYSIS METHODS

We have methods and equipment for measuring the following graphite properties according to GOST standards:

  • Compressive / flexural strength
  • Ash impurity content
  • Specific electrical resistance
  • Actual density
  • Rockwell hardness
  • Thermal conductivity
  • Tensile strength
  • Elasticity modulus



At the customer's request, we consider the possibility of graphite property analysis in accordance with ISO, ASTM and DIN.

CONCLUSIONS

1 Isostatic graphite is the most advanced material in the graphite industry and has been recommended to replace traditional grades of structural graphite.

2 The advantages of isostatic graphite compared to traditional grades are: higher stability and volumetric uniformity of product properties.

  • Large blank dimensions: up to Ø600×600 mm (in 2018: up to Ø600×1200 mm).
  • High strength, thermal stability and abrasion resistance comparable or even higher than that of MPG graphite grade.
  • Fine grain size and density; high chemical and oxidative resistance.

PRODUCTION FLOW CHART

Conclusion: the isostatic graphite production flow chart is very similar to traditional production technologies, but each process has significant differences that make it possible to produce graphite of much higher quality than that of traditional graphite.

ISOSTATIC GRAPHITE PROPERTIES

Advantages of isostatic graphite in comparison with typical kinds of artificial graphite:

  • Uniform structure and low porosity
  • Isotropic properties
  • High density and high mechanical strength
  • High thermal, chemical and oxidative resistance
  • Low ash content
Indicators Values per grade
IG-1S IG-2H
Average filler grain size, µm 50 25
Bulk density, g/cm³ 1,72–1,77 1,75–1,80
Compressive strength, MPa 45–60 80–100
Flexural Strength, MPa 25–35 40–50
Ash content, % 0,01–0,1
Specific electrical resistance, µΩ•m * 12–16 14–18
Thermal coefficient of linear expansion, 10–6 K–1 3–5
Thermal conductivity, W/m·K * 50–70 80–100*
Porosity, % 17–20 16–18
Overall graphite blank dimensions, mm * Ø(300–600)×(600–1200)