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Introduction and Applications of Graphite Crucibles

Brief Introduction to Graphite Crucibles

Graphite crucibles are high-temperature resistant containers made from natural flake graphite as the main raw material, with plastic refractory clay or carbonaceous materials as binders. They are processed through a series of procedures including batching, kneading, molding, and firing. Graphite crucibles possess excellent thermal conductivity, high-temperature resistance, thermal shock resistance, and chemical stability, making them ideal for melting non-ferrous metals and their alloys in industries such as metallurgy, casting, machinery, and chemical engineering.

Main Characteristics of Graphite Crucibles 1.

High-temperature resistance: Graphite crucibles can withstand temperatures ranging from 1200 to 1600°C, and some specially treated crucibles can even reach 1800°C. 2.

3.

Excellent thermal conductivity: The thermal conductivity of graphite is dozens of times that of refractory materials, which can significantly shorten the smelting time. 4.

5.

Strong thermal shock resistance: Can withstand sudden temperature changes without cracking. 6.

7.

Good chemical stability: It has excellent resistance to corrosion from acid and alkali solutions and molten metals. 8.

9.

Oxidation resistance: When used in a high-temperature oxidative atmosphere, a protective film can form on the surface. 10.

Classification of Graphite Crucibles 1.

By material: 2.

1.

Common graphite crucible 2.

3.

High-purity graphite crucible 4.

5.

Isostatic graphite crucible 6.

7.

Silicon carbide graphite composite crucible 8.

3.

By shape: 4.

1.

Cylindrical graphite crucible 2.

3.

Conical graphite crucible 4.

5.

Square graphite crucible 6.

7.

Irregular-shaped graphite crucible 8.

5.

By capacity: 6.

1.

Small graphite crucibles (No. 1 - No. 10) 2.

3.

Medium-sized graphite crucibles (No. 10 - No. 100) 4.

5.

Large graphite crucibles (size 100 and above) 6.

The main uses of graphite crucibles 1.

Non-ferrous metal smelting: 2.

1.

The smelting of precious metals such as gold, silver, and non-ferrous metals like copper, aluminum, and zinc. 2.

3.

Preparation of alloy materials 4.

3.

Laboratory applications: 4.

1.

High-temperature chemical reaction vessel 2.

3.

High-temperature treatment of materials 4.

5.

Crystal growth 6.

5.

Electronic industry: 6.

1.

Preparation of monocrystalline silicon and polycrystalline silicon 2.

3.

Purification of semiconductor materials 4.

7.

Mechanical manufacturing: 8.

1.

Precision casting 2.

3.

Metal heat treatment 4.

9.

Other industrial fields: 10.

1.

Glass industry 2.

3.

Rare earth smelting 4.

5.

Preparation of Chemical Catalysts 6.

Notes on Use 1.

Preheat before use to avoid sudden cooling and heating. 2.

3.

Handle with care during transportation to avoid collision. 4.

5.

Avoid direct contact with strong oxidants when in use. 6.

7.

When not in use for a long time, it should be stored in a dry environment. 8.

9.

Regularly check the wall thickness of the crucible and replace the severely worn ones in time. 10.

Graphite crucibles, due to their excellent performance, play an irreplaceable role in modern industrial production. With the advancement of materials science, their performance and application fields will be further expanded.