High-purity isostatic pressed graphite profiles

Product Overview
Our high-purity isostatic pressed graphite profiles (available as rods, cylinders, and blocks) are engineered for high-precision machining and extreme high-temperature environments. Through isostatic pressing and multiple purification processes, the material features a uniform, dense internal structure without macroscopic defects, ensuring excellent stability during precision machining and high-temperature applications.

Key Features

• Isotropic Properties: Consistent physical and mechanical properties in all directions, ensuring machining accuracy and dimensional stability at high temperatures.

• High Purity & Fine Grain: Extremely low ash content (typically <50ppm) and fine-grain structure, suitable for semiconductor and precision EDM applications.

• Excellent Machinability: Easy to turn, mill, drill, and grind into complex-shaped precision components.

• High-Temperature Resistance & Thermal Shock Resistance: Maintains high strength at elevated temperatures with excellent resistance to thermal shock.

Typical Applications

• EDM Electrodes: Graphite electrodes for high-precision mold electrical discharge machining.

• Semiconductor & Photovoltaic: Heaters, insulation cylinders, and susceptors in single-crystal silicon pulling and polysilicon casting furnaces.

• High-Temperature Vacuum Furnaces: Heating elements, support structures, connectors, and fasteners.

• Metal Continuous Casting: Molds, degassing rotors, and stirring rods for non-ferrous metals (e.g., aluminum, copper).

Custom Machining Services
Beyond standard-sized graphite cylinders and rods, we provide professional OEM/ODM services. Simply provide your 2D/3D drawings or samples, and our precision machining center will deliver a one-stop solution from blank cutting to high-precision finished parts.

Dimension of Round Special Graphite

Dimension of Square Special Graphite

The exceptional performance of isostatic graphite profiles originates from a rigorous manufacturing process. Our production flow includes the following key steps:

1. Raw Material Preparation & Mixing: High-quality petroleum coke, pitch coke, and coal tar pitch are selected, crushed, milled, accurately proportioned, and mixed uniformly at high temperatures.

2. Cold Isostatic Pressing (CIP): The mixed paste is loaded into rubber molds and placed in a high-pressure vessel. Ultra-high pressure is applied uniformly via a liquid medium, ensuring uniform density and isotropic properties of the material.

3. Baking: Long-term high-temperature baking is conducted in a protective atmosphere to carbonize the binder and transform the green body into a solid carbon material.

4. Impregnation: Liquid pitch is impregnated into the material's pores under vacuum and high pressure, followed by re-baking to significantly increase bulk density and mechanical strength.

5. Graphitization: Treated in an ultra-high temperature graphitization furnace at 2000°C to 3000°C, causing carbon atoms to rearrange into a graphite crystal structure, endowing the material with excellent electrical/thermal conductivity and high-temperature resistance.

6. Purification: Halogen gas high-temperature purification technology is used to reduce ash (impurity) content to extremely low levels, meeting the requirements of the semiconductor and nuclear industries.

7. Precision Machining: Based on customer requirements, CNC lathes, milling machines, and grinders are used to precisely machine the graphite profiles to ensure dimensional accuracy.