Efficient Crystallization of Amorphous Alloy Ribbons
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Summary
Problems
Existing methods for producing crystallized amorphous alloy ribbons are limited by low productivity due to the need to heat and crystallize each ribbon individually, which restricts the thickness of the ribbon stack and leads to inefficiencies in heat management.
Innovation solutions
A method involving a two-step heat treatment process, where a stack of amorphous alloy ribbons is first heated to a temperature below the crystallization start point, and then an end of the stack is heated to a temperature equal to or higher than the crystallization start point, allowing for efficient crystallization of the entire stack while managing heat dissipation.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If amorphous alloy ribbons are heated and crystallized one by one independently, then heat dissipation properties are improved and temperature rise is reduced, but productivity decreases
Why choose this principle:
The patent applies segmentation by dividing the heating process into two distinct stages: a first heat treatment step that heats the entire stack to a temperature below the crystallization start temperature, and a second heat treatment step that selectively heats only one end of the stack to a temperature equal to or higher than the crystallization start temperature. This segmented approach allows controlled crystallization propagation while maintaining efficient heat dissipation, resolving the contradiction between temperature control and productivity.
Principle concept:
If the thickness of the stack is increased to improve productivity, then more ribbons can be crystallized simultaneously, but heat dissipation becomes insufficient and temperature rises excessively
Why choose this principle:
The patent applies preliminary action by performing the first heat treatment step before the second heat treatment step. The first heat treatment pre-heats the entire stack to a temperature close to but below the crystallization start temperature, preparing the material for subsequent crystallization. This preliminary heating reduces the temperature differential needed in the second step, enabling better heat dissipation control even in thicker stacks, thereby allowing increased productivity without excessive temperature rise.
Application Domain
Data Source
AI summary:
A method involving a two-step heat treatment process, where a stack of amorphous alloy ribbons is first heated to a temperature below the crystallization start point, and then an end of the stack is heated to a temperature equal to or higher than the crystallization start point, allowing for efficient crystallization of the entire stack while managing heat dissipation.
Abstract
After a first heat treatment step, an ambient temperature of a stack is held so that the stack is kept in a temperature range that allows the stack to be crystallized by heating the end of the stack to a second temperature range in the second heat treatment step; and a following expression (1) is satisfied, where Q1 represents an amount of heat required to heat the stack to the first temperature range in the first heat treatment step, Q2 represents an amount of heat that is applied to the stack when heating the end of the stack to the second temperature range in the second heat treatment step, Q3 represents an amount of heat that is released during crystallization of the stack, and Q4 represents an amount of heat required to heat the entire stack to the crystallization start temperature Q 1+ Q 2+ Q 3> Q 4 (1).