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快凝Nd-Fe-B厚帶的制備與組織結構

Fabrication and Structure of Rapid Solidified Nd-Fe-B Thick Ribbons

  • 摘要: 采用單輥快凝法取代傳統的鑄錠法制備出了厚度為0.1~0.4mm的NdFeB厚帶.通過對制備快凝厚帶過程中不同的工藝參數的探索,獲得了工藝參數、帶片厚度及顯微組織間的關系.結果表明:制備0.25~0.35mm厚帶的最佳工藝參數為:輥輪轉速在10m/s左右,噴射壓力0.08~0.10MPa,輥嘴間距(2±0.5)mm.當帶片厚度為0.3mm時,帶片中以Nd2Fe14B相為主,沿著(410)方向Nd2Fe14B含量比例較大;其顯微結構主要是Nd2Fe14B片狀晶,富Nd薄層相之間的間距約為5 μm.帶片厚度為0.4mm時,厚帶試樣中α-Fe含量明顯大于Nd2Fe14B含量,并且擇優取向變成了(008).厚度0.1mm的厚帶的顯微結構中是細小的急冷等軸晶,厚度0.4mm的厚帶中有較大區域的等軸晶.

     

    Abstract: The Nd-Fe-B Ribbons of 0.1-0.4 mm thick were fabricated by using single roll melt spinning in replace of the traditional casting method. The relationship among the technological parameters, the thickness of ribbons and the microstructure is obtained. In order to fabricate the Nd-Fe-B ribbons of 0.25-0.35 mm thick, the optimum technological parameters should be controlled in the following range. The rolling velocity is about 10m/s, the jet pressure is 0.08-0.10 MPa, and the gap between the roll and the nozzle is (2±0.5) mm. The microstructure of the ribbon of 0.3 mm thick is mainly composed of lamellar Nd2Fe14B phase, which grows in the preferred orientation of <410>, and the spacing between the Nd-rich phases is 5 nm. For the ribbon of 0.4mm thick, the amount of α-Fe is obviously higher than that of Nd2Fe14B, and the preferred orientation is <008>. The microstructure of the ribbon of 0.1 mm thick is composed of fine equiaxed grains, but that of the ribbon of 0.4mm thick, of thick equiaxed grains.

     

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