Soft Magnetic Powder Composition for Stable Nanocrystallization
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Solution Overview
Problem
Heat treatment in the nanocrystallization process causes self-heating of soft magnetic powder, making it difficult to control temperature and resulting in unstable properties of the nanocrystal material.
Innovation Solution
Soft magnetic powder with specific glass transition and crystallization starting temperatures (Tg, Tx1, Tx2) within defined ranges, suppressing self-heating through endothermic reactions during nanocrystallization, allowing stable formation of fine nanocrystals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat treatment is performed in the nanocrystallization process, then nanocrystal material is formed, but self-heating occurs making temperature control difficult and properties unstable
Solution Approach 1:
The patent utilizes the glass transition phase transition of the amorphous phase at temperature Tg, which is an endothermic process. This phase transition absorbs heat during heating, suppressing self-heating effects and enabling stable temperature control during nanocrystallization. The glass transition temperature Tg is specifically designed to be within 50°C below the first crystallization temperature Tx1, ensuring the endothermic effect occurs at the optimal timing to counteract exothermic nanocrystallization heat.
2Temperature
If the first crystallization temperature Tx1 is lowered to suppress self-heating, then temperature control improves, but nanocrystal formation may be affected
Solution Approach 1:
The patent optimizes multiple temperature parameters simultaneously: glass transition temperature Tg, first crystallization temperature Tx1 (400-475°C), and second crystallization temperature Tx2. By carefully controlling the relationships between these parameters (ΔTx = Tx1 - Tg ≤ 50°C and ΔT = Tx2 - Tx1 = 65-135°C), the patent achieves both temperature control stability and high-quality nanocrystal formation. This multi-parameter optimization allows the system to balance heat suppression with proper crystal nucleation and growth.
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
The soft magnetic powder achieves stable nanocrystallization with improved magnetic properties by controlling temperature fluctuations, ensuring fine nanocrystals and reduced core loss.
Implementation Method 1
the soft magnetic powder has a glass transition temperature Tg, so that an endothermic reaction which accompanies glass transition is caused in a nanocrystallization process and the self-heating in the nanocrystallization is suppressed
Implementation Method 2
the soft magnetic powder has a glass transition temperature Tg, a first crystallization starting temperature Tx1 and a second crystallization starting temperature Tx2
Data Source
AI summary
A soft magnetic powder has a glass transition temperature Tg, a first crystallization starting temperature Tx1 and a second crystallization starting temperature Tx2. The first crystallization starting temperature Tx1 is 400° C. to 475° C. The difference between the first crystallization starting temperature Tx1 and the glass transition temperature Tg (ΔTx=Tx1−Tg) is 50° C. or less. The difference between the second crystallization starting temperature Tx2 and the first crystallization starting temperature Tx1 (ΔT=Tx2−Tx1) is 65° C. to 135° C.