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《中国有色金属学会会刊》2020,(5)
研究不同熔融纺丝轮表面形态,即光滑表面和齿轮结构表面,对液态金属雾化成粉末的影响。研究熔融纺丝过程中轮子转速、气体喷射压力、熔融金属温度、喷嘴-轮子间距等工艺参数和轮子表面形态对6060铝合金粉末及带材的形貌和显微组织特征的影响。结果表明,用光滑轮可得到带状材料,用齿轮可得到粉体。随着工艺参数的变化,用光滑齿轮生产的带材厚度为30~170μm,宽度为4~8 mm;用齿轮生产的粉末平均粒径为161~274μm。提高轮子转速和熔体温度、降低气体喷射压力和喷嘴与砂轮间距导致带材厚度和粉末粒径减小。粉末和带材的显微组织为等轴晶,且平均晶粒尺寸随着带材厚度和粉末粒径的减小而减小。在最大冷却速率为2.00×10~5和1.26×10~4 K/s条件下可分别得到厚度为30μm的带材和粒径为87μm的粉末。 相似文献
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研究了频率(f10 kHz)和磁场强度对商业非晶合金1K101和纳米晶合金1K107成品带材铁芯的损耗Pc和幅值磁导率μa的影响。结果表明,两种带材铁芯损耗Pc均正比于磁感应强度B的平方(Pc∝B2)及正比于频率f的平方(Pc∝f2);两种带材铁芯的μa都随B增加到一定值然后下降;当频率f为200 kHz时,1K107合金带材在B为0.4 T时最大幅值磁导率μa=27273.3;1K101合金带材在B=0.7 T时具有最大幅值磁导率μa=6548.9;在相同f、B条件下1K107带材损耗明显小于1K101,即便是f相同、B更大的情况下前者损耗仍可能小于后者,例如P1K107(200 kHz,0.7T)为1302.08 W/kg,P1K101(200 k Hz,0.4T)为2180.36 W/kg,表明纳米晶合金带材的磁性能明显优于非晶合金带材,更适合用于制备高频电力电子变压器铁芯。 相似文献
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磁通量闸门传感器铁芯用CoFeSiB非晶带材性能的改进磁饱和铁芯地磁仪磁通量闸门,是一种具有高鉴别能力测量低频弱磁场用的器件,其工作原理是基于作为传感器铁芯使用的软磁材料的非线性性能。近来作为铁芯材料使用了过渡金属的非晶态合金取得明显效益,这种合金具... 相似文献
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采用脉冲电沉积方法在φ90μm的Cu丝上制备出Fe20+δNi80-8/Cu复合丝,并测试了巨磁阻抗(GMI)特性。实验表明:电镀液的pH值在1.48~3.1范围内变化,对于复合丝的镀层成分、厚度、表面质量及其巨磁阻抗(GMI)效应具有显著的影响。在pH为1.9~2.5时复合丝表面平整、缺陷少,在pH=2.03时获得了厚度为11μm、成分为Fe20.3Ni79.7的电镀沉积层。采用10mA的激发电流,频率f=29.6kHz时GMI效应达到631.5%,磁场的灵敏度在10kHz时达到560%/Oe,该频率远远低于CoFeSiB非晶丝材的频率。 相似文献
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冷却速度对快淬Fe-Si-B-Cu合金结构和磁性能的影响 总被引:1,自引:1,他引:0
采用单辊旋淬法,以不同的轮辊转速(50、40、30和25 m/s)制备高Fe含量Fe_(82.65)Cu_(1.35)Si_2B_(14)非晶合金薄带,研究了冷却速度对快淬合金结构和性能的影响.结果表明:随冷却速度的降低,淬态Fe_(82.65)Cu_(1.35)Si_2B_(14)合金的条带厚度逐渐增大,合金由完全的非晶态结构转变为非晶与纳米晶的混合结构;同时,随冷却速度的降低,一次晶化温度下降,材料的饱和磁感应强度逐渐增加,在轮辊转速为25 m/s时,淬态合金的饱和磁感应强度达到1.4 T. 相似文献
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The effects of ribbon thickness (t) on the structure and magnetic properties of a Fe82.3B13Cu1.7Nb3 alloy in melt-spun and annealed states have been investigated. Increasing the t from 15 to 23 μm changes the structure of the melt-spun ribbons from a single amorphous phase to a composite with dense α-Fe nanograins embedded in the amorphous matrix. The grain size (Dα-Fe) of the α-Fe near the free surface of the ribbon is about 6.7 nm, and it gradually decreases along the cross section toward the wheel-contacted surface. Further increasing the t to 32 μm coarsens the Dα-Fe near the free surface to 15.2 nm and aggravates the Dα-Fe ramp along the cross section. After annealing, the ribbon with t = 15 μm has relatively large α-Fe grains with Dα-Fe > 30 nm, while the thicker ribbons possessing the pre-existing nanograins form a finer nanostructure with Dα-Fe < 16 nm. The structural uniformity of the ribbon with t = 23 μm is better than that of the ribbon with t = 32 μm. The annealed ribbons with t = 23 and 32 μm possess superior soft magnetic properties to the ribbon with t = 15 μm. The ribbon with t = 23 μm exhibits a high saturation magnetic flux density of 1.68 T, low coercivity of 9.6 A/m, and high effective permeability at 1 kHz of 15,000. The ribbon with t = 32 μm has a slightly larger coercivity due to the lower structural uniformity. The formation mechanism of the fine nanostructure for the ribbons with suitable t has been discussed in terms of the competitive growth effect among the pre-existing α-Fe nanograins. 相似文献
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本文采用铜模吸铸工艺制备了外径5 mm、内径3 mm的Fe36Co36B19.2Si4.8Nb4非晶合金磁环,并采用X射线衍射(XRD)、示差扫描量热仪(DSC)、振动样品磁强计(VSM)和软磁交流性能测量仪分析了该非晶合金环的结构、热稳定性和磁性能。结果表明:该非晶合金的玻璃转变温度和晶化温度分别为568.5℃和604.4℃,饱和磁化强度为99.7 emu/g;在磁感应强度不变时,频率升高,其相对磁导率降低,磁损耗增大;保持频率不变,磁感应强度增大时,其相对磁导率降低,磁损耗增大。 相似文献
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在铁基非晶纳米晶合金,普通氮气热处理最佳退火温度的基础上,将热等静压工艺引入到非晶带材磁芯的退火工艺中,探究热等静压工艺对Fe基非晶纳米晶合金软磁性能的影响。用X射线衍射仪、精密磁性元件测试仪和软磁交流设备测量了铁基非晶带材的晶体结构、磁芯的电感L和磁损耗Ps等。结果表明,在频率100 kHz和工作磁感应强度Bm=0.1 T时,普通氮气保护退火样品的矫顽力和磁损耗为2.04 A/m、10.10 W/kg,而热等静压样品则为1.33 A/m、6.58 W/kg,分别降低了53.4%、34.9%;普通氮气保护退火样品的有效磁导率和品质因数为11 579、0.46,而热等静压则为15 980、0.70,分别增加了38.0%、52.2%。 相似文献
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《Intermetallics》2016
Fe-rich amorphous dust core alloys with minor-addition of Mo and/or Cr were synthesized because of the industrial request of mass production of high efficient low core loss Fe-based dust cores. It was found that the present Fe-(Cr, Mo)-P-B-Si-(C) amorphous alloy ribbons exhibit good soft magnetic properties of above 1.5 T for saturation magnetization, below 10 A/m for coercivity and rather good corrosion resistance in 3%NaCl aqueous solution. Besides, the amorphous alloy ribbons exhibit good bending ductility in as-spun and optimally annealed states. It is noticed that these characteristics are much superior to those for commercial Fe-Cr-Nb-P-B-Si soft magnetic dust core alloy (SENNTIX). In addition, the annealing treatment was noticed to cause the improvement of corrosion resistance without detriment to bending ductility. The new Fe-based soft magnetic alloys with good combined characteristics are expected to be used as the basic material as high-efficient soft magnetic dust cores in a high frequency range. 相似文献