Brief Introduction of High-Purity Graphite Plates

In high-end manufacturing fields such as semiconductors, photovoltaics and new energy, there exists an indispensable material. It has ultra-high purity and is resistant to extreme high-temperatures and corrosion resistant. It is widely applied in the core thermal field of single crystal furnaces, while facilitating the precision manufacturing processes of chips. This high-performing material is the high-purity graphite plate.

High-purity graphite plates are the plate-shaped carbon materials made from premium raw materials including petroleum coke, pitch coke or high-purity natural graphite through a series of production processes like calcination, kneading, forming, baking, high-temperature graphitization (above 2800℃) and purification. The primary advantage of high-purity graphite plates is their exceptional purity, and their total impurity content is typically controlled below 10-50 ppm, which means impurities account for no more than 50 parts per million of the material.

Why are high-purity graphite plates so sought?

The widespread application of high-purity graphite plates stems from its six core properties, each perfectly meeting the stringent requirements of high-end manufacturing.

1.Ultra-high purity translates to extremely low ash content and no impurity volatilization at high temperatures, preventing contamination of precision manufacturing processes such as semiconductor wafer production.

2.Superior high-temperature resistance makes them stably operate at up to 3000℃ in inert or vacuum environments.

3.Excellent thermal and electrical conductivity, featuring a thermal conductivity coefficient of approximately 120–150 W/(m·K) and an electrical conductivity close to 70% of copper.

4.Reliable chemical stability, resistant to strong acids, alkalis and highly corrosive media, with almost no reaction to molten metals.

5.Strong thermal stability, characterized by a low thermal expansion coefficient, high thermal shock resistance and high dimensional accuracy.

6.Easy machinability, suitable for different application scenarios.

Main applications of high-purity graphite plates

The applications of high-purity graphite plates have long permeated all aspects of our lives, from mobile phone chips and solar cells to aerospace and new energy vehicles.

1. 3N Grade (99.9% purity) fro basic high-end fields

This grade is cost-effective and meets regular high-end manufacturing needs, being widely used in metallurgy, vacuum furnaces, heat treatment, precision casting molds, general graphite products, and chemical anti-corrosion components such as reactor linings, heat exchanger plates and seals.

2. 4N Grade (99.99% purity) for core of photovoltaics and new energy

As the most widely used grade at present, it is applied in core components of thermal fields for photovoltaic mono/polycrystalline furnaces including heating elements, insulation covers and guide cylinders, carrier plates for solar cell production, lithium batteries such as anode current collectors and conductive substrates, fuel cell bipolar plates, and semiconductor auxiliary parts.

3. 5N Grade (99.999% purity) for emiconductors and high-end electronics

Semiconductor wafer manufacturing (heaters, crucibles, carriers for single crystal furnaces), chip manufacturing processes (focus rings for etching machines, trays for deposition equipment), thermal fields for high-end electronics, and optical coating. It demands an extremely high level of purity and is one of the core materials for the chip industry.

In addition to the above applications, high-purity graphite plates are used in precision industries like aerospace for rocket nozzles and aero-engine heat insulation components, the nuclear industry for neutron moderators and control rods for nuclear reactors, EDM electrodes, and high-temperature heat sinks.