Research on production technology of nonmagnetic Fe-Mn alloy powders by water atomization
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摘要: 采用水雾化法制备铁锰无磁合金粉末, 分析了合金粉末含锰质量分数和雾化工艺对铁锰合金粉末性能的影响规律。结果表明: 水雾化法生产铁锰无磁合金粉的方案可行, 但锰质量分数不宜低于24%;在实验工况条件下, 雾化压力对松装密度的影响可以忽略不计, 雾化压力提高使产品流动性变差, 以15 MPa雾化压力进行生产时, 产品工艺性能(松装密度、流动性) 最好; 雾化压力的提高有助于提高产品烧结密度, 在满足产品流动性要求的前提下, 可以考虑通过提高雾化压力来提高产品烧结密度。Abstract: Nonmagnetic Fe-Mn alloy powders were prepared by water atomization method. The influences of manganese contents by mass and water atomizing parameters on the properties of Fe-Mn alloy powders were investigated. The results show that, the nonmagnetic Fe-Mn alloy powders can be prepared by water atomization process when the manganese content by mass is below 24%. Under the laboratory conditions, the effect of atomizing pressure on loose density of Fe-Mn alloy powders is negligible, but the flow ability of powders gets worse when the atomizing pressure increases. The best properties of loose density and flow ability are achieved when the atomizing pressure is 15 MPa. The higher atomizing pressure can improve the sintering density of alloy powders, thus, on the premise of flow ability, the sintering density can be improved by increasing the atomizing pressure.
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图 1 配料及制粉工艺方案
Figure 1. Experimental scheme of blending process and powder preparation
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图 4 磁重比与锰质量分数曲线图
Figure 4. Relationship of magnetic-weight ratio and manganese content by mass
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图 5 雾化压力对产品性能的影响: (a) D50; (b) 松装密度; (c) 流动性
Figure 5. Influence of atomizationpressureontheper for manceofproducts: (a) D50; (b) loose density; (c) flowability
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图 6 雾化压力(a) 和D50 (b) 对烧结密度的影响
Figure 6. Influences of atomization pressure (a) and D50 (b) on the sintered density of products
表 1 性能测试项目
Table 1 Performance test schedule
锰质量分数/% 磁重比 粒度 松装密度 流动性 烧结密度 18 √ — — — √ 22 √ — — — √ 24 √ √ √ √ √ 26 √ — — — √ 30 √ — — — √ 
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