Graphite Crucible

Graphite Crucible

Purity: ≥99%

  • Custom sizes and standard sizes in stock
  • Competitive Price
  • Quick Lead Time

  • Graphite Crucible is made from high-purity graphite through precision molding and high-temperature treatment, offering outstanding thermal conductivity, extreme temperature resistance, and excellent chemical inertness. It maintains structural integrity during rapid heating and cooling cycles, resists corrosion from molten metals, and ensures clean, efficient melting processes. It is widely used in metallurgy, semiconductor, chemical industries, and precious metal refining. We can supply high-quality flexible graphite foil with various specifications and competitive prices, offering customized solutions to meet specific requirements.
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Graphite Crucible Data Sheet

Reference Code

HM2598

Purity

≥99.9%

Color

Dark Gray to Black

Chemical Formula

C

Material Grades

Natural Graphite, Synthetic Graphite, Specialty Graphite, Composites Graphite

Density

1.65–1.95 g/cm³

Maximum Operating Temperature

Up to 3000°C (in inert atmosphere)

Thermal Conductivity

100–200 W/m·K

Graphite Crucible Description

Graphite Crucible is crafted from high-purity natural graphite, designed to handle extreme heat and aggressive chemical environments. Thanks to its high thermal stability and low thermal expansion, it can endure sudden temperature changes without cracking. Its smooth inner surface minimizes metal adhesion, allowing for easy pouring and higher purity of molten materials. It is an essential tool for smelting metals such as gold, silver, copper, and aluminum in industrial and laboratory settings.

Graphite Crucible Specifications

Items

Unit

Value

Grain Size

mm

0.045-4

Bulk Density

g/cm3

1.65-1.95

Resistivity

μΩ•m

8.0-11.0

Bending Strength

Mpa

18-55

Compressive Strength

Mpa

36-100

The Coefficient of Thermal Expansion (C.T.E)

×10-6/ ℃

2.9-3.0

Ash

%

0.1-0.3

Dimensions

Diameter

mm

10-1100

Length

mm

≤2500

Products can be customized as order requirements or specific drawings.

Graphite Crucible Features

  • High Density and Electrical Conductivity: Manufactured with a dense structure, graphite crucibles offer excellent electrical conductivity and stable performance at high temperatures.
  • Long Service Life: A special glaze coating and high material density significantly improve corrosion resistance, extending the crucible’s operational lifespan.
  • Advanced Graphitization Process: The use of high-purity graphite enhances thermal conductivity and structural strength, making the crucible more reliable under thermal cycling.
  • Exceptional Heat Resistance: Capable of withstanding temperatures up to 2760°C (5000°F) or even 3000°C (5472°F) in high-purity grades, suitable for melting a wide range of metals without contamination.
  • Outstanding Thermal Performance: Features excellent thermal conductivity, thermal stability, and resistance to thermal shock, ensuring faster melting times and durability.
  • Strong Chemical Resistance: Offers superior resistance against acids, alkalis, and corrosive environments, making it ideal for demanding industrial applications.

Graphite Crucible Applications

  • Metal Melting: Ideal for melting metals like aluminum, copper, brass, and precious metals, graphite crucibles provide the high heat resistance and thermal conductivity necessary for efficient processing.
  • High-Temperature Processes: Widely used in furnaces and other high-temperature applications, graphite crucibles maintain their integrity even under extreme heat, ensuring reliable performance.
  • Precious Metal Refining: Graphite crucibles are commonly used in the refining of precious metals such as gold, silver, and platinum, offering excellent corrosion resistance and minimal contamination.
  • Casting and Molding: Due to their superior thermal shock resistance, graphite crucibles are frequently employed in the casting and molding of alloys, ensuring high precision and smooth operation.
  • Electronics and Semiconductor Industries: Used for processing materials in electronics and semiconductor manufacturing, where high temperatures and stable performance are crucial.
  • Electronic Devices
  • Metal Smelting
  • High-temperature ovens
  • Casting and Molding

Graphite Material Properties

Property

Minimum Value (S.I.)

Maximum Value (S.I.)

Units (S.I.)

Minimum Value (Imp.)

Maximum Value (Imp.)

Units (Imp.)

Atomic Volume (average)

0.0052

0.0054

m³/kmol

317.323

329.528

in³/kmol

Density

1.61

2.49

Mg/m³

100.509

155.446

lb/ft³

Bulk Modulus

2.3

15.3

GPa

0.333587

2.21908

10⁶ psi

Compressive Strength

31

345

MPa

4.49617

50.038

ksi

Ductility

0.00171

0.00189

–

0.00171

0.00189

–

Elastic Limit

4.8

76

MPa

0.696181

11.0229

ksi

Endurance Limit

15.47

18.05

MPa

2.24373

2.61793

ksi

Fracture Toughness

0.4

2.4

MPa·m¹/²

0.364019

2.18411

ksi·in¹/²

Hardness

295

326

MPa

42.7862

47.2823

ksi

Loss Coefficient

0.002

0.02

–

0.002

0.02

–

Modulus of Rupture

24

110

MPa

3.48091

15.9542

ksi

Poisson’s Ratio

0.17

0.23

–

0.17

0.23

–

Shear Modulus

1.7

11.5

GPa

0.246564

1.66793

10⁶ psi

Tensile Strength

4.8

76

MPa

0.696181

11.0229

ksi

Young’s Modulus

4.1

27.6

GPa

0.594654

4.00304

10⁶ psi

Property

Minimum Value (S.I.)

Maximum Value (S.I.)

Units (S.I.)

Minimum Value (Imp.)

Maximum Value (Imp.)

Units (Imp.)

Latent Heat of Fusion

1600

1810

kJ/kg

687.873

778.156

BTU/lb

Maximum Service Temperature

2850

2960

K

4670.33

4868.33

°F

Melting Point

3800

3950

K

6380.33

6650.33

°F

Minimum Service Temperature

0

0

K

-459.67

-459.67

°F

Specific Heat

697

771

J/kg·K

0.539379

0.596645

BTU/lb·F

Thermal Conductivity

8.7

114

W/m·K

16.2867

213.412

BTU·ft/h·ft²·F

Thermal Expansion

0.6

5.2

10⁻⁶/K

1.08

9.36

10⁻⁶/°F

Property

Minimum Value (S.I.)

Maximum Value (S.I.)

Units (S.I.)

Minimum Value (Imp.)

Maximum Value (Imp.)

Units (Imp.)

Resistivity

7.94

11

10⁻⁸ ohm·m

7.94

11

10⁻⁸ ohm·m

Boron Carbide Material Grades

Natural graphite is classified into three primary types: amorphous graphite, flake graphite, and vein (lump) graphite. Each type has distinct characteristics and suits different industrial needs.

Graphite Type

Introduction

Key Properties

Amorphous Graphite

Microcrystalline graphite from metamorphosed coal seams; dull appearance and soft texture.

– Carbon content: 60–85%
– Fine particle size
– Good thermal conductivity
– Moderate electrical conductivity
– Good lubricating properties

Flake Graphite

Layered graphite formed in metamorphic rocks; shiny with metallic luster.

– Carbon content: 85–99%
– Excellent thermal conductivity
– High electrical conductivity
– Strong lubricity
– Stable in chemical environments

Vein (Lump) Graphite

Hydrothermally formed graphite with the highest purity and conductivity.

– Carbon content: 90–99%
– Exceptional thermal conductivity
– Very high electrical conductivity
– Superior oxidation resistance
– Excellent chemical stability

Synthetic graphite is produced through the high-temperature treatment of carbonaceous materials. It offers more controlled properties compared to natural graphite, such as higher purity, better uniformity, and specific performance advantages for different industrial applications. Common types include biographite, die-molded graphite, extruded graphite, isostatic graphite, and vibration-molded graphite.

Graphite Type

Introduction

Key Properties

Biographite

Derived from biological materials through carbonization.

– Carbon content: 80–95%
– Moderate thermal and electrical conductivity
– Porous structure, good for filtration
– Resistant to acids and bases

Die-Molded Graphite

Compacted carbon powders molded and graphitized.

– High density and strength
– Excellent electrical conductivity
– Chemically inert
– Highly machinable

Extruded Graphite

Extruded carbon material with directional grain structure.

– High carbon content >99%
– Good conductivity
– Anisotropic properties
– Moderate wear resistance

Isostatic Graphite

Produced by isostatic pressing for uniform properties.

– Ultra-high purity >99.99%
– Isotropic strength
– Excellent thermal and electrical conductivity
– Fine grain structure

Vibration-Molded Graphite

Graphite formed by vibration compaction.

– High carbon content >99%
– Good electrical conductivity
– Durable with high compressive strength
– Machinable into large parts

Specialty graphite encompasses a wide range of engineered graphite materials designed to meet the demanding requirements of various industries. Each grade is uniquely processed or modified to enhance specific properties such as thermal conductivity, chemical resistance, structural strength, or electrical performance. These materials are critical across fields like energy storage, electrical discharge machining, nuclear technology, and high-temperature processing. Whether achieved through purification, impregnation, or advanced deposition techniques, specialty graphite grades offer targeted solutions where ordinary graphite would not suffice.

Grade

Key Properties

Applications

Battery-Grade Graphite

High purity (>99.95%), electrochemical stability, low surface area, spherical/flake particles (5–20 μm)

Lithium-ion batteries, energy storage systems

EDM Graphite

Fine grain (2–10 μm), high electrical conductivity, lightweight, erosion resistance, thermal conductivity

Electrical discharge machining (EDM)

Flexible Graphite

Highly flexible, thermal conductivity (150–300 W/m·K), chemical resistance, compressibility, wide temp range

Gaskets, seals, EMI shielding, thermal management

Metal-Impregnated Graphite

Enhanced thermal and electrical conductivity, corrosion resistance, mechanical strength, wear resistance

Bearings, seals, chemical processing equipment

Nuclear-Grade Graphite

High density (>1.70 g/cm³), low neutron absorption, thermal stability, radiation resistance, low porosity

Nuclear reactors (moderators, reflectors, shielding)

Pyrolytic Graphite

Highly anisotropic, in-plane conductivity, EMI shielding, chemical resistance, high density (≈2.20 g/cm³)

Electronics, aerospace, medical devices

Refractory Graphite

Abrasion and thermal shock resistance, chemical stability, oxidation resistance (coated), low thermal expansion

Metallurgy, ceramic industry, chemical reactors

Resin-Impregnated Graphite

Chemical resistance, improved strength, reduced porosity, oxidation resistance, lower conductivity

Pumps, mechanical seals, chemical handling equipment

Graphite composites combine graphite with other materials like carbon, fibers, resins, or metals to enhance and balance their properties for specific high-performance applications. These composites retain graphite’s natural benefits such as lubricity, conductivity, and thermal stability while improving strength, wear resistance, or structural rigidity. Widely used across industries like aerospace, metallurgy, electronics, and chemical processing, graphite composites offer excellent solutions for demanding environments where traditional materials may fail.

Property

Carbon-Graphite

Graphite-Fiber Composites

Wear Resistance

High, effective in high-friction applications

Good, with strong fatigue and impact resistance

Strength

High strength and rigidity

Exceptional tensile strength and high stiffness

Density

Lightweight due to low density

Very low density for critical weight reduction

Thermal Stability

Operates up to 3000°C in inert environments

Maintains integrity at high temperatures

Thermal Conductivity

Moderate to high, depending on constituents

High, enabling excellent heat dissipation

Electrical Conductivity

Good, suitable for EDM and electrodes

Moderate, useful for EMI shielding

Chemical Resistance

Resistant to acids, alkalis, and organic solvents

Inert to most chemicals, moisture, and UV

Friction Properties

Self-lubricating, low friction even at extreme temperatures

High fatigue resistance, low thermal expansion

Oxidation Resistance

Limited, but can be enhanced with coatings

Stable in non-oxidizing environments

Applications

Metallurgy, EDM electrodes, high-temperature parts

Aerospace, structural composites, electronics

Graphite Ceramic Machining

Graphite is a synthetic ceramic material made from crystalline carbon, offering exceptional thermal conductivity, high thermal resistance, low porosity, and stability at extreme temperatures. These properties make it essential for high-heat applications like casting, metallurgy, and electronics. However, machining graphite requires specialized techniques due to its unique characteristics: it is brittle and can produce fine particles and fissures during processing. Graphite does not deform under cutting forces like metals, demanding precise handling to maintain dimensional accuracy and surface integrity. Common machining methods include:

  • CNC Machining: Computer-controlled drilling, milling, and grinding are widely used for creating complex graphite parts with tight tolerances.
  • Diamond Grinding: Diamond tools are applied to achieve smooth finishes and precise shapes while minimizing particle generation.
  • Sawing: Specialized saws are used for cutting graphite blocks into specific sizes or rough shapes before finer machining.
  • Drilling: Custom graphite drilling requires careful speed and feed control to avoid cracks and achieve clean holes.
  • Milling: High-speed milling with carbide or diamond-coated tools is utilized to produce detailed profiles and cavities.
  • Surface Finishing: After primary shaping, additional grinding or polishing ensures the required surface finish for technical applications.

Graphite Ceramic Packaging

Graphite ceramic products are typically packaged in vacuum-sealed bags to prevent moisture or contamination and wrapped with foam to cushion vibrations and impacts during transport, ensuring the quality of products in their original condition.

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To customize your flexible graphite crucible, please provide the following details:

  1. Dimensions: Top Diameter x Bottom Diameter x Height x Wall Thickness
  2. Material Grade: Specify the material grades.
  3. Purity of the material
  4. Shapes: Cylinder, Conical Cylinder, Rectangular, T-shape, or customized.
  5. Tolerances: Specify the tolerances you can apcept.
  6. Surface Finish: polished, rough, etc.
  7. Quantity of the crucibles you need
  8. Alternatively, you can provide a drawing with your specifications.

Once we have these details, we can provide you with a quote within 24 hours.

We carry a wide variety of graphite ceramic products in stock, and for these, there is generally no minimum order requirement. However, for custom orders, we typically set a minimum order value of $200. The lead time for stock items is usually 1-2 weeks, while custom orders usually take 3-4 weeks, depending on the specifics of the order.

Graphite crucibles are most commonly used for melting non-ferrous metals such as aluminum, copper, brass, and gold. They are also suitable for melting various alloys, as they can endure the high temperatures required for these processes. However, graphite crucibles may not be ideal for melting certain metals that can chemically react with carbon or those requiring specialized crucibles.

To extend the life of a graphite crucible, avoid sudden temperature changes (thermal shock), handle it carefully to prevent mechanical damage, and store it in a dry, ventilated place. Also, avoid contact with moisture and acids when not in use, as these can degrade the crucible over time.

Advanced Ceramic Hub, established in 2016 in Colorado, USA, is a specialized supplier and manufacturer of graphene products. With extensive expertise in supply and export, we offer competitive pricing and customized solutions tailored to specific requirements, ensuring outstanding quality and customer satisfaction. As a professional provider of ceramics, refractory metals, specialty alloys, spherical powders, and various advanced materials, we serve the research, development, and large-scale industrial production needs of the scientific and industrial sectors.

Graphite Crucible

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