Heat treatment process of nanometer composite permanent magnetic RE material
A heat treatment method, rare earth permanent magnet technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve problems such as unfavorable uniform and small exchange coupling ideal microstructure, expansion of temperature difference between soft and hard magnetic phases, etc.
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[0015] 1. Rare earth metals with a purity greater than 99.8%, pure iron and boron-iron have a ratio of (Nd 1-x Dy x ) 4.5 Fe 77 B 18.5 (x=0.0, 0.1, 0.2, 0.3, 0.4) alloys (considering the volatilization of raw materials during the smelting process, it is generally assumed that pure iron and ferroboron remain unchanged, and the rare earth metals are 3-5% according to the specific smelting process and smelting times The burning loss rate increases the margin), and then put it into a vacuum arc melting furnace for 3-5 times of melting. The vacuum degree during smelting is better than 3×10 -3 Pa.
[0016] 2. After the surface of the smelted ingot is decontaminated and crushed, it is placed in a vacuum quenching furnace and rapidly solidified to obtain samples of amorphous strips or scale-like fragments. The vacuum degree during rapid quenching is better than 3×10 -3 Pa, the line speed is greater than 36m / s.
[0017] 3. The prepared amorphous sample is measured by differenti...
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