ANTI-OXIDATION COATED GRAPHITE ELECTRODES

1.Graphite Electrode Substrate Production

Raw Material Processing: Raw materials such as petroleum coke and pitch coke are crushed, screened, and mixed with coal tar pitch.

Forming: The mixture is shaped into green bodies via extrusion or molding.

Baking: The green bodies are baked at around 1200°C in an oxygen-free environment to carbonize the pitch and form a preliminary graphite structure.

Graphitization: The baked electrodes are subjected to high-temperature treatment (above 3000°C) in an electric furnace to rearrange carbon atoms into high-purity graphite.

Machining: The electrodes are precision-machined (turning, threading, etc.) to ensure dimensional accuracy.

2,Anti-Oxidation Coating Treatment

Coating Selection: Common coatings include aluminum-based, ceramic-based, or composite coatings (e.g., Al-Si, ZrO₂).

Coating Processes:

Immersion Method: Electrodes are dipped into coating slurry and then cured at high temperatures.

Spraying Method: Plasma or flame spraying is used for high-melting-point ceramic coatings.

Chemical Vapor Deposition (CVD): Ensures high coating uniformity but is more expensive.

Post-Treatment: High-temperature sintering (500–800°C) enhances coating adhesion.

Key Features

High-Temperature Resistance: Can withstand long-term exposure to 600–800°C and short-term exposure above 1200°C.

Low Consumption Rate: Reduces oxidation loss by 20–50%, extending electrode lifespan by over 30%.

Excellent Conductivity/Thermal Conductivity: Maintains high electrical conductivity for stable arc performance.

High Mechanical Strength: Good thermal shock resistance minimizes fracture risk.

Common Specifications

Diameter: 75mm–750mm (customizable for different furnace types).

Length: 1.5m–3m (customizable).

Joint Types: NPT threads, tapered joints, etc.

Coating Type Comparison