摘要
非晶合金具有高磁导率、高饱和磁通量、低矫顽力、低铁损等优良磁性能,具有广阔的应用前景,是综合性能优异的软磁材料。越来越受到国内外研究人员的广泛关注。本论文主要做了以下几个方面的工作:
(1)用真空电弧炉熔炼成分为(Fe_(1-x)Co_x)_(89-y)Zr_7B_4Cu_y(x=0、0.3、0.5,y=1及x=0.5,y=0)的母合金。
(2)利用单辊法制备了(Fe_(1-x)Co_x)_(89-y)Zr_7B_4Cu_y非晶薄带,辊速为42m/s,喷嘴口尺寸为2mm×0.3mm,压差为0.04MPa,厚度在30～50μm。通过XRD、MS表征制备态的(Fe_(1-x)Co_x)_(89-y)Zr_7B_4Cu_y(x=0、0.3、0.5,y=1及x=0.5,y=0)四种成分的非晶合金薄带。(Fe_(1-x)Co_x)_(89-y)Zr_7B_4Cu_y(x=0、0.3,y=1)两种成分非晶合金存在少量晶态相。(Fe_(1-x)Co_x)_(89-y)Zr_7B_4Cu_y(x=0.5,y=1及X=0.5,y=0)两种成分的合金为全非晶。
(3)用差热分析对Fe_(44)Co_(44)Zr_7B_4Cu_1和Fe_(44.5)Co_(44.5)Zr_7B_4非晶合金进行热稳定性分析。Fe_(44)Co_(44)Zr_7B_4Cu_1和Fe_(44.5)Co_(44.5)Zr_7B_4非晶合金DTA曲线都有两个放热峰,表明晶化是分为两阶段进行。Fe_(44)Co_(44)Zr_7B_4Cu_1和Fe_(44.5)Co_(44.5)Zr_7B_4非晶合金初次晶化起始温度分别为499℃和506℃。对于(Fe_(1-x)Co_x)_(89-y)Zr)7B_4Cu_y非晶合金,减少1at.%Cu使过冷液相区变宽了11℃,提高了(Fe_(1-x)Co_x)_(89-y)Zr_7B_4Cu_y非晶合金的热稳定性。
(4)对Fe_(44)Co_(44)Zr_7B_4Cu_1和Fe_(44.5)Co_(44.5)Zr_7B_4非晶合金进行磁脉冲处理,用MS分析脉冲处理后的微结构变化。MS结果表明经脉冲磁场处理后Fe_(44.5)Co_(44.5)Zr_7B_4非晶薄带存在少量的晶态相;晶化量随磁脉冲处理的场强和作用时间的增大而增大;内磁场方向随磁脉冲处理场强和作用时间的增加而逐渐趋向带平面沿带长方向。
(5)对磁脉冲处理前后的Fe_(44.5)Co_(44.5)Zr_7B_4非晶合金用VSM进行磁性能测量。经磁脉冲处理的Fe_(44.5)Co_(44.5)Zr_7B_4非晶薄带(平行处理),比饱和磁化强度(x方向测量)较淬态的Fe_(44.5)Co_(44.5)Zr_7B_4非晶薄带有所增加。
Amorphous alloys with low coercivity H_c, large saturation inductions B_s, large resistivityand good thermal stability are the newest generation of soft magnetic materials. Itincreasingly appealed to widespread attention of domestic and foreign researchers. Thepresent paper has mainly done the following several aspect work.
(1) Master alloy of (Fe_(1-x)Co_x)_(89-y)Zr_7B_4Cu_y(x=0、0.3、0.5, y=land x=0.5, y=0) wasobtained by vacuum arc furnace smelting equipment.
(2) (Fe_(1-x)Co_x)_(89-y)Zr_7B_4Cu_y amorphous alloy ribbons were cast by melt spinning of singleroll casting method. Roller speed is 42m/s. The nozzle size of quartz tube is 2mm×0.3mm.Pressure difference is 0.04MPa. The as-quenched (Fe_(1-x)Co_x)_(89-y)Zr_7B_4Cu_y ribbons have thethickness in 30μm～50μm. The amorphous alloy ribbons were characterized by XRD andMS. The results indicated that (Fe_(1-x)Co_x)_(89-y)Zr_7B_4Cu_y(x=0、0.3, y=1) ribbons have occurredobvious crystallization, and (Fe_(1-x)Co_x)_(89-y)Zr_7B_4Cu_y(x=0.5, y=1及x=0.5, y=0) ribbons arecompletely amorphous.
(3) Using differential thermal analysis (DTA), the thermal stability of Fe_(44)Co_(44)Zr_7B_4Cu_1and Fe_(44.5)Co_(44.5)Zr_7B_4 amorphous alloy ribbons were studied. The results of DTA showed thatFe_(44)Co_(44)Zr_7B_4Cu_1 and Fe_(44.5)Co_(44.5)Zr_7B_4 amorphous alloy ribbons both have two exothermicpeaks in the DTA curve respectively. The crystallization is divided into two stages. Initialtemperature of primary crystallization for Fe_(44)Co_(44)Zr_7B_4Cu_1 and Fe_(44.5)Co_(44.5)Zr_7B_4 amorphousalloy ribbons is 499℃and 506℃, respectively. For the (Fe_(1-x)Co_x)_(89-y)Zr_7B_4Cu_y amorphousalloy, the undercooled liquid region broaden 11℃by reducing of 1 at.%Cu that enhanced thethermo-stability of (Fe_(1-x)Co_x)_(89-y)Zr_7B_4Cu_y amorphous alloy.
(4) The Fe_(44)Co_(44)Zr_7B_4Cu_1 and Fe_(44.5)Co_(44.5)Zr_7B_4 amorphous alloy ribbons were treatedby low-frequency magnetic pulsing. After magnetic pulse processing, the microstructurechange was analyzed by the MS. The MS results showed that after magnetic pulse processing,Fe_(44.5)Co_(44.5)Zr_7B_4 amorphous alloy ribbons exist some crystallizations and the quantity of crystallization increased along with the increasing of magnetic pulse intensity and treatmenttime. With magnetic pulse intensity and treatment time increased, the interior magnetic fielddirection gradually tended to the ribbons plane along the ribbons length direction.
(5) The measure of the magnetic property of Fe_(44.5)Co_(44.5)Zr_7B_4 amorphous alloy ribbonsbefore and after magnetic pulse processing had be tested by VSM. It indicated that thesaturation magnetization (measured along X-direction) of Fe_(44.5)Co_(44.5)Zr_7B_4 amorphous alloyribbons after magnetic pulse processing (parallel processing) is lager than that of as-quenchedFe_(44.5)Co_(44.5)Zr_7B_4 amorphous alloy ribbons.
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