铁磁性非晶合金的磁弹性耦合研究
发布时间：2018-08-20 10:52
【摘要】：磁致伸缩效应及其产生的磁弹性耦合作用是非晶合金敏感功能的核心,在生物传感器、声磁防盗系统的应用获得了国内外学者的广泛关注,成为非晶合金研究和应用的新热点。本文以传感器应用的铁磁性非晶合金为研究对象,系统研究了热处理工艺对非晶合金磁弹性耦合作用的影响,探讨了磁致伸缩与共振特性的关系,分析了共振性能优化的机理。具体内容如下:开发了 Fe26.76Ni40.06Co14.96Si2.56B15.11非晶合金共振片材料,采用激光多普勒法研究了其磁致伸缩特性,热处理能有效改善合金的磁致伸缩特性,曲线斜率增大,线性度变好;共振片的共振特性与磁致伸缩动态曲线斜率有关,最强共振峰所在的最佳偏置场位置与磁致伸缩动态曲线斜率最大位置相对应,可采用参数e=λ/H设计和选择最佳工作点;制备出适合防盗标签的性能优异的共振片,在热处理温度为380℃、速度为40mm/s、磁场角度为67.5°、热处理张应力为60MPa时共振频率fr为57.8KHz,共振幅值A1为372mV,品质因素约为400。采用Kerr法观察了非晶合金共振片的磁畴结构,分析了共振性能优化的机理。共振片在一定偏置场下的共振特性与磁致伸缩特性和磁畴结构有关,热处理中形成尺寸小于30μm的细化条形畴,降低磁畴磁矩转动过程中的微涡流损耗,有利于改善非晶共振片的共振性能。分析了共振片的变形对磁畴形貌的影响,结果发现共振片弯曲变形对贴辊面和自由面的磁畴结构具有相反的影响,横向的拉应力会使磁畴尺寸变大,而横向的压应力会使磁畴尺寸变小。开发了具有大的非晶形成能力的Fe70-xNixCr2.3Mo2.5B5.5C7Si3.3P8.7(x=3 or 6)块体非晶合金,等温退火改善了其低磁场下的磁致伸缩特性,获得饱和磁致伸缩系数λs≈14×10-6,磁弹性耦合系数为0.4以上的性能,为开发新型的应力传感器进行了探索。
[Abstract]:Magnetostrictive effect and its magnetoelastic coupling are the core of the sensitive function of amorphous alloys. The applications of biosensors and acoustic and magnetic anti-theft systems have attracted wide attention from scholars at home and abroad, and have become a new research and application hotspot of amorphous alloys. In this paper, the effect of heat treatment on magnetoelastic coupling of ferromagnetic amorphous alloys used in sensors is systematically studied, the relationship between magnetostriction and resonance characteristics is discussed, and the mechanism of resonance performance optimization is analyzed. The main contents are as follows: the magnetostrictive properties of Fe26.76Ni40.06Co14.96Si2.56B15.11 amorphous alloy are studied by laser Doppler method. Heat treatment can effectively improve the magnetostrictive properties of the alloy. The curve slope is increased and the linearity is improved. The resonance characteristic of the resonator is related to the slope of the magnetostrictive dynamic curve. The position of the best bias field in the strongest resonance peak corresponds to the maximum position of the slope of the magnetostrictive dynamic curve. The optimum working point can be designed and selected by using the parameter E = 位 / H; The resonators with excellent properties suitable for anti-theft label were prepared. The resonance frequency fr was 57.8 KHz, the total amplitude A1 was 372mV, and the quality factor was about 400 when the heat treatment temperature was 380 鈩，
本文编号：2193330
[Abstract]:Magnetostrictive effect and its magnetoelastic coupling are the core of the sensitive function of amorphous alloys. The applications of biosensors and acoustic and magnetic anti-theft systems have attracted wide attention from scholars at home and abroad, and have become a new research and application hotspot of amorphous alloys. In this paper, the effect of heat treatment on magnetoelastic coupling of ferromagnetic amorphous alloys used in sensors is systematically studied, the relationship between magnetostriction and resonance characteristics is discussed, and the mechanism of resonance performance optimization is analyzed. The main contents are as follows: the magnetostrictive properties of Fe26.76Ni40.06Co14.96Si2.56B15.11 amorphous alloy are studied by laser Doppler method. Heat treatment can effectively improve the magnetostrictive properties of the alloy. The curve slope is increased and the linearity is improved. The resonance characteristic of the resonator is related to the slope of the magnetostrictive dynamic curve. The position of the best bias field in the strongest resonance peak corresponds to the maximum position of the slope of the magnetostrictive dynamic curve. The optimum working point can be designed and selected by using the parameter E = 位 / H; The resonators with excellent properties suitable for anti-theft label were prepared. The resonance frequency fr was 57.8 KHz, the total amplitude A1 was 372mV, and the quality factor was about 400 when the heat treatment temperature was 380 鈩，
本文编号：2193330
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