Assistant alloy for Nd-Fe-B permanent magnetic material and its preparation method

Abstract

The invention relates to an auxiliary alloy of neodymium iron boron permanent magnetic material and relative one-way control heat flow preparation method. The invention is characterized in that: said auxiliary alloy comprises one or several rare-earth elements, whose total amount is between 30-60wt%, and the other is transition group and one or several kinds of other metallic elements. The producing method comprises: melting raw material to cast the rotational water cooling disc; the rotational water cooling disc forces the water cooling to control the one-way hot flow direction to form the auxiliary alloy with fine cylinder crystal solidified organism. Compared to traditional neodymium iron boron auxiliary alloy producing method, the invention has high producing efficiency, non-component error analysis, uniform solidified organism, easy breakage and high magnetic property without uniform heating process.

Description

technical field

[0001] The invention relates to the field of new functional materials and their manufacture, in particular to a neodymium-iron-boron auxiliary alloy and a preparation method for unidirectional heat flow control. Background technique

[0002] Take Nd 2 Fe 14 NdFeB permanent magnet materials with B as the matrix have long occupied an extremely important position in magnetic functional materials due to their excellent magnetic properties. The double alloy sintering is currently an effective method for preparing high-performance NdFeB magnets, that is, the main phase --- Nd 2 Fe 14 Phase B and grain boundary phase --- rare earth-rich phase (with high concentration of rare earth elements) are mixed and sintered. Nd 2 Fe 14 The B-phase alloy is called the main alloy, and the rare earth-rich phase is called the auxiliary alloy. The former is the basis of magnetic properties, and the latter is the basis of liquid phase sintering. Auxiliary alloys have a great ...

Images