On August 16, 2026, Tianjiu Metals released a study on the processing of FeSiAl magnetic powder cores, using a master alloy of 9at%Si-6at%Al-85at%Fe and 100–400 mesh magnetic powder. The study systematically examined the effects of four parameters — annealing temperature, compaction pressure, powder particle size, and powder heat treatment — on permeability and core loss.
Key findings: ① Increasing the annealing temperature from 580°C to 740°C initially raised permeability and reduced core loss; however, beyond a critical point of 700°C, binder carbonization created pores, which decreased permeability and increased eddy current loss. ② Raising the compaction pressure from 1.2 GPa to 2.4 GPa increased density from 5.72 to 5.85 g/cm³, with permeability following density gains, though the benefit diminished above 1.8 GPa. ③ Finer powder (100–200 mesh down to 300–400 mesh) resulted in lower permeability and lower core loss, attributed to increased surface defects and greater insulation coating coverage on finer particles. ④ After heat treating the powder at 560°C for 1 hour, an oxide layer formed on the surface, which reduced both permeability and core loss.
Tianjiu Metals is a domestic supplier of soft magnetic powders, with a product line covering 316L, 17-4PH, H13, 18Ni300, FeSiAl, Inconel 625/718, AlSi10Mg, TC4, and CoCrMo. Its applications extend to new energy vehicles, charging piles, 3C electronics, and metal 3D printing. FeSiAl soft magnetic powders are used in iron-silicon magnetic cores, choke coils, and microwave-absorbing materials.
Value for powder buyers: ① Procurement technical agreements for FeSiAl soft magnetic powder should specify particle size segmentation (within 100–400 mesh) and heat treatment condition, as these directly determine the permeability-loss balance. ② Magnetic core manufacturers place high demands on powder batch consistency (particle size distribution, oxygen content), favoring suppliers with classification capabilities and surface oxidation control. ③ Soft magnetic powder and metal 3D printing powder share the same atomization production line logic, so attention should be paid to Tianjiu Metals' expansion pace in additive grades such as 316L, TC4, and AlSi10Mg.
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铁硅铝磁粉芯性能新解：天久金属解析磁导率与损耗关键影响因素
2026年8月16日，天久金属发布铁硅铝（FeSiAl）磁粉芯工艺研究：以 9at%Si-6at%Al-85at%Fe 母合金、100~400 目磁粉为原料，系统考察退火温度、成型压力、磁粉粒度与磁粉热处理四类参数对磁导率与磁芯损耗的影响。
实验结论：① 退火温度 580→740℃ 区间磁导率升高、损耗降低，但超过临界 700℃ 后粘结剂碳化产生孔洞，磁导率反降、涡流损耗增加；② 成型压力 1.2→2.4GPa 区间密度由 5.72 升至 5.85 g/cm³，磁导率随密度上升，1.8GPa 以上增益趋缓；③ 磁粉粒度越细（100-200目→300-400目）磁导率越低、损耗越低，源于细粉表面缺陷增多与绝缘包覆面积增大；④ 磁粉经 560℃×1h 热处理后表面形成氧化物，磁导率与损耗双降。
天久金属为国内软磁粉末供应商，产品线覆盖 316L、17-4PH、H13、18Ni300、FeSiAl、Inconel 625/718、AlSi10Mg、TC4、CoCrMo 等金属粉末，应用延伸至新能源汽车、充电桩、3C 电子与金属 3D 打印，FeSiAl 软磁粉末用于铁硅磁芯、扼流线圈与吸波材料。
对粉末采购商的价值：① FeSiAl 软磁粉末采购技术协议应明确粒度分段（100-400 目内）与热处理状态，两者直接决定磁导率—损耗平衡；② 磁粉芯厂商对粉末批次一致性（粒度分布、含氧量）要求高，具备分级供货与表面氧化控制能力的厂商占优；③ 软磁粉末与金属 3D 打印粉末共用雾化产线逻辑，关注天久金属在 316L/TC4/AlSi10Mg 等增材牌号上的扩产节奏。
