Amorphous Alloy Ribbon Crystallization Temperature Control
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Solution Overview
Problem
The existing methods for manufacturing nanocrystalline alloy ribbon pieces by crystallizing amorphous alloy ribbon pieces through heating often result in excessive temperature increases due to self-heating, leading to burning or deterioration of soft magnetic properties.
Innovation Solution
A method that controls the temperature increase rate of amorphous alloy ribbon pieces from the crystallization starting temperature to the termination temperature, ensuring that the self-heating amount is less than or equal to the heat discharge amount plus the product of mass, specific heat, and temperature increase, thereby preventing excessive temperature rises and maintaining soft magnetic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the temperature is simultaneously increased at the whole amorphous alloy ribbon piece to a temperature at which the crystallization of the amorphous alloy is completed in a wide area of the alloy ribbon piece, then the crystallization process can be completed efficiently, but self-heating due to the crystallization simultaneously occurs in the wide area of the amorphous alloy ribbon piece to cause excessive temperature increase on the amorphous alloy ribbon piece, resulting in burning of the alloy ribbon piece
Solution Approach 1:
The patent divides the crystallization process into multiple temperature stages rather than heating the entire ribbon piece to the final crystallization temperature simultaneously. The temperature is increased in steps, allowing different regions of the ribbon piece to crystallize at different times, which prevents concentrated self-heating in wide areas and avoids burning while maintaining production efficiency.
2Loss of time
If the temperature increase rate is high to complete crystallization quickly, then the manufacturing time is reduced, but the self-heating amount exceeds the heat discharge amount, causing excessive temperature increase and deterioration of soft magnetic properties
Solution Approach 1:
The patent employs periodic temperature increase steps with holding periods at intermediate temperatures. The temperature is increased to a holding temperature, held to allow crystallization and heat discharge to balance, then increased further. This periodic heating pattern ensures that self-heating does not exceed heat discharge capacity at any stage, preventing excessive temperature increase and preserving soft magnetic properties while completing crystallization in a controlled timeframe.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach facilitates the manufacturing of alloy ribbon pieces with excellent soft magnetic properties by suppressing excessive temperature increases and preventing the growth of coarse crystal grains, ensuring efficient production without complex heating facilities.
Implementation Method 1
increasing a temperature of the amorphous alloy ribbon piece to a crystallization starting temperature; and increasing the temperature of the amorphous alloy ribbon piece from the crystallization starting temperature to a crystallization process termination temperature
Implementation Method 2
self-heating due to the crystallization simultaneously occurs in the wide area of the amorphous alloy ribbon piece to cause excessive temperature increase
Data Source
AI summary
The present disclosure provides a method that ensures easily manufacturing an alloy ribbon piece having excellent soft magnetic properties. The method is a method for manufacturing an alloy ribbon piece obtained by crystallizing an amorphous alloy ribbon piece and including: increasing a temperature of the amorphous alloy ribbon piece to a crystallization starting temperature; and increasing the temperature of the amorphous alloy ribbon piece from the crystallization starting temperature to a crystallization process termination temperature equal to or less than a crystallization completion temperature. A temperature increase rate of the amorphous alloy ribbon piece in the increasing of the temperature of the amorphous alloy ribbon piece from the crystallization starting temperature to the crystallization process termination temperature satisfies ΔQself≤ΔQout+mcΔT where a self-heating amount, a heat discharge amount, a mass, a specific heat, and a temperature increase width of the amorphous alloy ribbon piece per unit time is ΔQself, ΔQout, m, c, and ΔT, respectively.