Multi-element Zn-Sn-Cu-Bi-Nd brazing filler metal for brazing of sintered Nd-Fe-B and steel and preparation process of multi-element Zn-Sn-Cu-Bi-Nd brazing filler metal

Abstract

The invention discloses multi-element Zn-Sn-Cu-Bi-Nd brazing filler metal for brazing of sintered Nd-Fe-B and steel and a preparation process of the multi-element Zn-Sn-Cu-Bi-Nd brazing filler metal,and belongs to the technical field of welding and connecting. The Zn-based brazing filler metal comprises, by weight percent (Wt / %), 4%-6% of stannum (Sn), 0.5%-2% of copper (Cu), 1%-3% of bismuth (Bi), 1%-5% of neodymium (Nd) and the balance zinc (Zn). The smelting process of the multi-element Zn-Sn-Cu-Bi-Nd brazing filler metal comprises the steps of firstly, smelting of a Zn-Nd intermediate alloy and secondly, smelting of the multi-element Zn-Sn-Cu-Bi-Nd brazing filler metal. Nd is added in the manner of the Zn-Nd alloy. The melting temperature range is 380 DEG C to 450 DEG C, the wetting area to a sintered Nd-Fe-B magnetic material and the steel ranges from 130 mm<2> to 150 mm<2>, the shear strength for brazing of the sintered Nd-Fe-B magnetic material and the steel ranges from 45 Mpato 60 Mpa, the bending strength ranges from 80 Mpa to 100 Mpa, and the magnetic performance stability of the sintered Nd-Fe-B magnetic material is guaranteed.

Description

technical field [0001] The invention relates to a multi-element zinc-tin-copper-bismuth neodymium filler material for brazing and sintering NdFeB and steel, which is applied to the brazing of NdFeB magnetic materials and the brazing of NdFeB magnetic materials and other metals, belonging to welding and connection technology field. Background technique [0002] NdFeB is an intermetallic compound Nd 2 Fe 14 The B-based high-performance rare earth permanent magnet material has a main component (wt.%) containing 30% of neodymium, 1% of boron, and the balance is iron. NdFeB magnetic materials have excellent magnetic properties and cannot be replaced by other permanent magnet materials. They are widely used in aerospace, digital electronics, computer technology, automobiles and petrochemical industries. The NdFeB magnetic material developed by advanced powder making and sintering technology has extremely high magnetic energy product and coercive force, and has the best magnetic...

AI Technical Summary

Problems solved by technology

If the NdFeB magnetic material is welded at a higher temperature, the magnetic structure or crystal structure of the material will be destroyed, and in severe cases, the material will lose its permanent magnetic properties; the NdFeB magnetic material is a brittle material, and it will not It will cause a large internal stress in the material and cause the magnetic structure or crystal structure of the material to break, and the permanent magnetic properties will also be lost

The welding of NdFeB and steel heterogeneous materials or NdFeB and NdFeB homogeneous materials is a key technical problem that has been widely concerned by the industry but has not been well resolved.

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