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采用石蠟基粘結劑體系制備注射成形Sm2Co17永磁體

Sm2Co17 permanent magnets prepared by PIM with PW-based binder

  • 摘要: 選擇石蠟基熱塑性粘結劑,采用粉末注射成形(PIM)工藝制備燒結Sm2Co17永磁體.粘結劑由PW、HEPE、LEPE、PP和SA組成,通過分析喂料流變性能和磁體殘碳含量,確定合適的組元配比(質量比)為PW:LEPE:PP:SA=7:1:1:1.在氬氣和氫氣混合氣氛下熱脫脂,永磁體的碳、氧含量較低.最終得到永磁體的磁性能為:剩磁Br=0.51T,內稟矯頑力Hcj=168kA·m-1,最大磁能積BHmax=21.3kJ·m-3.與傳統方法制備的永磁體相比,PIM永磁體退磁曲線的方形度較差,磁性較低.造成磁體性能較差的原因是殘碳的質量分數較高(≥ 0.33%),較高的碳含量導致磁體中出現高熔點的非磁性相ZrC,使Zr的有效含量降低,片狀相和1:5相體積分數減少,胞狀顯微組織和微觀結構被破壞,磁性能下降.因此,采用PIM工藝制備高性能燒結釤鈷永磁體,其關鍵是降低磁體中的殘余碳含量.

     

    Abstract: Powder injection molding (PIM) was used to prepare sintered Sm2Co17 magnets with paraffin wax (PW) based binder, which consists of 70% PW, 10% LEPE, 10% PP, and 10% SA (mass fraction). The binder is removed by thermal debinding in the mixing atmosphere of argon and hydrogen. The magnetic properties of the sintered PIM magnets are remanence Br=0.51 T, intrinsic coercivity Hcj=168 kA·m-1, and maximum energy product BHmax=21.3 kJ·m-3. Compared with commercial magnets, the magnetic properties are poor because the PIM magnets have high carbon mass fraction (0.33%). Carbon consumes the effective content of Zr and forms high melting-point nonmagnetic phase (ZrC), which results in the decrease in volume content of lamella phase and 1:5 phase. Deterioration of the cellular structure and SEM structure leads to the decrease in magnetic properties of the PIM magnets. It is concluded that residual carbon in the magnets should be removed when the sintered magnets is prepared by PIM.

     

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