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Graphite Rotor Shaft for Rotary Flux Injector with High-Temperature Resistance Thermal Shock Resistance and Self-Lubrication

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Graphite Rotor Shaft for Rotary Flux Injector with High-Temperature Resistance Thermal Shock Resistance and Self-Lubrication

Graphite Rotor Shaft for Rotary Flux Injector with High-Temperature Resistance Thermal Shock Resistance and Self-Lubrication
Graphite Rotor Shaft for Rotary Flux Injector with High-Temperature Resistance Thermal Shock Resistance and Self-Lubrication
Graphite Rotor Shaft for Rotary Flux Injector with High-Temperature Resistance Thermal Shock Resistance and Self-Lubrication Graphite Rotor Shaft for Rotary Flux Injector with High-Temperature Resistance Thermal Shock Resistance and Self-Lubrication Graphite Rotor Shaft for Rotary Flux Injector with High-Temperature Resistance Thermal Shock Resistance and Self-Lubrication Graphite Rotor Shaft for Rotary Flux Injector with High-Temperature Resistance Thermal Shock Resistance and Self-Lubrication Graphite Rotor Shaft for Rotary Flux Injector with High-Temperature Resistance Thermal Shock Resistance and Self-Lubrication Graphite Rotor Shaft for Rotary Flux Injector with High-Temperature Resistance Thermal Shock Resistance and Self-Lubrication

Imagem Grande :  Graphite Rotor Shaft for Rotary Flux Injector with High-Temperature Resistance Thermal Shock Resistance and Self-Lubrication

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Graphite Rotor Shaft for Rotary Flux Injector with High-Temperature Resistance Thermal Shock Resistance and Self-Lubrication

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High-Temperature Resistance Graphite Rotor Shaft

,

Thermal Shock Resistance Rotary Flux Injector

,

Self-Lubrication Graphite Rotor

Graphite Rotor Shaft
Application in the Aluminum Industry
The graphite rotor shaft is a core consumable component in aluminum melt purification equipment (such as in-line degassing boxes and degassing units). Its primary function is to efficiently break up and disperse inert gas (such as argon or nitrogen) into a large number of uniform, fine micro-bubbles.
Graphite Rotor Shaft for Rotary Flux Injector with High-Temperature Resistance Thermal Shock Resistance and Self-Lubrication 0
Core Functions & Working Principle
A graphite rotor shaft typically consists of a long shaft and a rotor head at the bottom. Its core functions during operation are as follows:
  • Rotation & Shear Action: Driven by a motor, the graphite rotor rotates at high speed (typically 300-500 RPM). The specially designed blades on the rotor head create a strong shearing effect on the introduced inert gas.
  • Bubble Refinement: It "pulverizes" the large bubbles entering the melt from porous plugs or lances, forming a cloud of micro-bubbles with small diameter (typically required to be less than 1-2mm) and uniform distribution.
  • Creating Flow & Extending Path: The rotating rotor creates strong vortex or convective flow within the melt. This continuously brings fresh melt into the reaction zone and significantly extends the rise path and residence time of the micro-bubbles in the melt.
Key Roles in Aluminum Melt Treatment
Through the above working principle, the graphite rotor shaft achieves crucial metallurgical effects:
  • Efficient Hydrogen Removal (Degassing): Based on partial pressure difference and surface adsorption principles, hydrogen atoms in the melt diffuse into the inert gas bubbles. The finer, more numerous, and longer the bubbles reside, the greater the total gas-liquid interfacial area provided, exponentially increasing degassing efficiency.
  • Effective Inclusion Removal: As the fine bubbles rise, their surfaces adsorb suspended oxide slags and non-metallic inclusions. These adsorbed inclusions float to the melt surface with the bubbles, enter the dross layer, and are removed by skimming.
  • Composition & Temperature Homogenization: The intense stirring action generated by the rotor rotation rapidly homogenizes the chemical composition and temperature throughout the melt bath, preventing segregation and thermal stratification.
Graphite Rotor Shaft for Rotary Flux Injector with High-Temperature Resistance Thermal Shock Resistance and Self-Lubrication 1
Why Graphite is the Preferred Material
The irreplaceability of the graphite rotor shaft stems from the exceptional properties of graphite material itself:
  • Excellent high-temperature resistance (720°C - 800°C operation)
  • Outstanding thermal shock resistance
  • Good self-lubrication properties
  • High thermal conductivity
  • Excellent machinability for complex shapes
  • Non-wetting with aluminum melt
Main Application Scenarios
Graphite rotor shafts are primarily used in:
  • In-Line Degassing Systems: Essential for continuous casting production lines, performing 24/7 degassing to ensure defect-free cast products.
  • Mobile Degassing Units: Used in batch production foundries for treatment within holding or melting furnaces.
Challenges & Service Life
Graphite rotor shafts operate under harsh conditions with several failure modes:
  • Oxidation erosion at high temperatures
  • Erosion from aluminum melt washout
  • Mechanical damage from improper operation
  • Thermal stress cracking
Service life varies from a few days to several weeks depending on quality, process parameters, and maintenance. Proper operation (adequate preheating, avoiding dry running, regular cleaning) is key to extending lifespan.
Conclusion
The graphite rotor shaft is an indispensable component in modern aluminum melt purification technology. It physically transforms inert gas into millions of micro-bubbles, accomplishing the three core tasks of degassing, inclusion removal, and homogenization with high efficiency. Its performance quality and proper usage directly determine the final aluminum product's quality and production cost.

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unidade de desgaseificação giratória de 600 RPM,

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