Smelting
First, raw materials (e.g., iron, silicon, boron, and other alloying elements) are proportioned precisely and melted in a vacuum or inert gas environment to form a homogeneous alloy melt.
Dive into the world of amorphous and nanocrystalline wonders!
First, raw materials (e.g., iron, silicon, boron, and other alloying elements) are proportioned precisely and melted in a vacuum or inert gas environment to form a homogeneous alloy melt.
Next, the melt is rapidly ejected onto the surface of a high-speed rotating copper (or copper alloy) roller. Due to the extreme cooling rate (up to 10⁶ K/s) from the roller, the melt solidifies instantly into a continuous, thin amorphous ribbon (thickness usually 10–50 μm, width 10–300 mm) without forming a crystalline structure.
Subsequently, the amorphous ribbon undergoes controlled annealing treatment (at temperatures around 500–600°C) in a protective atmosphere. This process triggers the nucleation and growth of nanoscale crystals (typically 10–20 nm in size) within the amorphous matrix, transforming the ribbon into a nanocrystalline structure with excellent magnetic properties.
For toroidal cores: Wind the cut ribbons layer by layer on special molds, ensuring tight adhesion between layers to form a closed-loop structure.
For laminated cores (e.g., E-shaped, C-shaped): Cut the ribbons into single pieces of corresponding shapes, stack them in a specific direction, and fix them with tooling.
The nanocrystalline epoxy spraying process is a key procedure that forms a uniform epoxy coating on nanocrystalline cores via surface pretreatment, epoxy spraying, curing, and quality control to enhance their insulation, mechanical strength, and environmental protection performance.
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Include amorphous or nanocrystalline materials and related devices.
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