On August 16, 2026, Tianjiu Metals released a study on FeSiAl magnetic powder core processing, using 9at%Si-6at%Al-85at%Fe master alloy and 100-400 mesh magnetic powder as raw materials. 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 annealing temperature from 580°C to 740°C initially raised permeability and reduced loss, but beyond the critical 700°C threshold, binder carbonization created pores, causing permeability to drop and eddy current loss to rise; 2) Raising compaction pressure from 1.2 to 2.4 GPa increased density from 5.72 to 5.85 g/cm³, with permeability rising along with density, though gains tapered off above 1.8 GPa; 3) Finer powder (100-200 mesh vs. 300-400 mesh) led to lower permeability and lower loss, attributed to increased surface defects and greater insulation coating coverage on fine particles; 4) Heat-treating powder at 560°C for 1 hour formed surface oxides, reducing both permeability and 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, CoCrMo, and other metal powders. Applications extend to new energy vehicles, charging piles, 3C electronics, and metal 3D printing. FeSiAl soft magnetic powder is used in iron-silicon magnetic cores, choke coils, and microwave-absorbing materials.
Value for powder buyers: 1) Technical agreements for FeSiAl soft magnetic powder procurement should specify particle size fractions (within 100-400 mesh) and heat treatment status, as both directly determine the permeability-loss balance; 2) Powder core manufacturers demand high batch consistency (particle size distribution, oxygen content), giving an advantage to suppliers capable of classified grading and surface oxidation control; 3) Soft magnetic and metal 3D printing powders share atomization production lines, so monitor Tianjiu Metals' capacity expansion pace for additive-grade materials like 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。
