Product description

High-density carbon graphite tubes are not "carbon nanotubes" in the narrow sense. They generally refer to high-density, high-performance graphite or carbon composite tubes. This chapter presents graphite tubes made from high-purity graphite, which offer both high density and excellent performance.

The core performance advantages of high-density carbon graphite tubes made from high-purity graphite are as follows:
1. High-temperature resistance: These carbon graphite tubes can withstand temperatures of 2000-3000°C in an oxygen-free environment.
2. Excellent thermal conductivity: These graphite tubes offer thermal conductivity comparable to that of metals and exhibit anisotropic properties.
3. Extremely low thermal expansion coefficient: These graphite tubes exhibit minimal dimensional change with temperature, resulting in excellent thermal stability.
4. Excellent chemical stability: These high-density graphite tubes are resistant to acid and alkali corrosion and do not react with most metal solutions.
5. High strength and modulus: These graphite tubes exhibit excellent mechanical properties, especially at high temperatures, where their strength increases rather than decreases.
6. Excellent self-lubrication.

Due to these outstanding properties, high-density carbon graphite tubes have a wide range of applications, primarily in the following industrial sectors:
1. Semiconductor Industry: This is the most important application for high-density graphite tubes. In this industry, they are commonly used as heaters, insulation tubes, flow guides, and supports. They can also serve as bases for silicon wafers, requiring them to withstand high temperatures without deformation or pollution.
2. Photovoltaic Industry: They are often used in polysilicon casting furnaces as heaters, insulation layers, and crucible guards, making them key consumables in the production of polysilicon ingots for solar cells.
3. High-Temperature Vacuum Furnaces and Heat Treatment Industry: In sintering furnaces, graphite tubes serve as heating elements, hearths, feed trays, and guide rails, withstanding the friction and high temperatures caused by the repeated movement of workpieces. In silicon carbide sintering furnaces, they serve as key thermal field components. In vacuum brazing furnaces, they serve as fixtures and supports, as they do not react with the molten brazing material.

4. Industrial Furnace and Metallurgical Industries: In a protective atmosphere or vacuum, it can be used as material racks and hoppers, with a lifespan far exceeding that of metal parts. In continuous galvanizing lines, it is used as sinking rollers, stabilizing rollers, and bushings.

In short, high-density carbon graphite tubes are a key strategic advanced basic material, with applications almost exclusively focused on high-end manufacturing applications with extreme requirements for temperature, purity, stability, and corrosion resistance.

graphite tube 117