【摘要】：磁致伸縮效應及其產生的磁彈性耦合作用是非晶合金敏感功能的核心,在生物傳感器、聲磁防盜系統(tǒng)的應用獲得了國內外學者的廣泛關注,成為非晶合金研究和應用的新熱點。本文以傳感器應用的鐵磁性非晶合金為研究對象,系統(tǒng)研究了熱處理工藝對非晶合金磁彈性耦合作用的影響,探討了磁致伸縮與共振特性的關系,分析了共振性能優(yōu)化的機理。具體內容如下:開發(fā)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縮特性,熱處理能有效改善合金的磁致伸縮特性,曲線斜率增大,線性度變好;共振片的共振特性與磁致伸縮動態(tài)曲線斜率有關,最強共振峰所在的最佳偏置場位置與磁致伸縮動態(tài)曲線斜率最大位置相對應,可采用參數e=λ/H設計和選擇最佳工作點;制備出適合防盜標簽的性能優(yōu)異的共振片,在熱處理溫度為380℃、速度為40mm/s、磁場角度為67.5°、熱處理張應力為60MPa時共振頻率fr為57.8KHz,共振幅值A1為372mV,品質因素約為400。采用Kerr法觀察了非晶合金共振片的磁疇結構,分析了共振性能優(yōu)化的機理。共振片在一定偏置場下的共振特性與磁致伸縮特性和磁疇結構有關,熱處理中形成尺寸小于30μm的細化條形疇,降低磁疇磁矩轉動過程中的微渦流損耗,有利于改善非晶共振片的共振性能。分析了共振片的變形對磁疇形貌的影響,結果發(fā)現共振片彎曲變形對貼輥面和自由面的磁疇結構具有相反的影響,橫向的拉應力會使磁疇尺寸變大,而橫向的壓應力會使磁疇尺寸變小。開發(fā)了具有大的非晶形成能力的Fe70-xNixCr2.3Mo2.5B5.5C7Si3.3P8.7(x=3 or 6)塊體非晶合金,等溫退火改善了其低磁場下的磁致伸縮特性,獲得飽和磁致伸縮系數λs≈14×10-6,磁彈性耦合系數為0.4以上的性能,為開發(fā)新型的應力傳感器進行了探索。
[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，

本文編號：2193330