磷酸浓度对Fe-6.5%Si磁粉芯组织及磁特性的影响  被引量:8

Effects of phosphate concentration on the structure and magnetic properties of Fe-6.5%Si magnetic powder cores

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作  者:李腊[1,2] 蔡一湘[2] 刘辛[2] 毛新华[2] 易健宏[1] 

机构地区:[1]昆明理工大学材料科学与工程学院,昆明650000 [2]广州有色金属研究院粉末冶金研究所,广州510650

出  处:《粉末冶金材料科学与工程》2016年第6期899-906,共8页Materials Science and Engineering of Powder Metallurgy

基  金:科技部科研院所技术开发研究专项资金(2010EG215058);广东省应用型科技研发专项(2015B010136004)

摘  要:摘要:通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)、差示扫描量热仪(DSC)、傅里叶红外光谱仪(FTIR)、综合物性测量系统(PPMS)及软磁交流测量装置对Fe-6.5%Si磷化粉末及其磁粉芯的结构和磁特性进行分析。结果表明:在不同的磷酸浓度条件下,粉末表面均可获得覆盖均匀的FePO4薄层;磷化粉末在550℃左右发生FePO4晶化反应,在1000℃左右发生Si02合成反应。随磷酸浓度增加,包覆层厚度从3~5μm增加到10μm左右,粉末的饱和磁化强度逐渐降低;磁粉芯600℃退火后的物相结构为α-Fe(Si),FePO4,Fe2O3混合相,其微观应变在磷酸浓度为0.15g/mL时达到最低值;随磷酸浓度增加,磁粉芯有效磁导率下降,而总损耗、磁滞损耗和涡流损耗均呈先降低后升高的趋势,在0.15g/mL磷酸浓度时达到最低。The microstructure and magnetic properties of Fe-6.5% Si phosphate powder and powder cores were analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), fourier transform infrared spectroscopy (FTIR), physical property measurement system (PPMS) and soft magnetic alternating current measurement device. The results show that the thin FePO4 layer is coated uniformly on the powder surface under different phosphate concentrations. The reactions of FePO4 crystallization and SiO2 synthesis occur at 550 ℃ and 1000 ℃, respectively. With increasing phosphate concentration, the thickness of coating layer increases from 3-5 μm to 10 μm and saturation magnetization of phosphatized Fe-6.5% Si powders decreases. The powder cores possesses ct-Fe(Si), FePO4 and Fe203 phases after annealing at 600 ℃, and the rnicrostrain of powder cores with phosphate concentration of 0.15 g/mL is the lowest. With increasing phosphoric concentration, the effective permeability of powder cores decrease, while the total loss, hysteresis loss and eddy current loss decrease firstly and then increase, and reach the minimum value at 0.15 g/mL.

关 键 词:Fe-6.5%Si 磷酸盐包覆 磁粉芯 磁学性能:磷酸浓度 

分 类 号:TM271[一般工业技术—材料科学与工程]

 

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