a国产,中文字幕久久波多野结衣AV,欧美粗大猛烈老熟妇,女人av天堂

當(dāng)前位置:主頁 > 碩博論文 > 工程博士論文 >

鐵磁性非晶合金的磁彈性耦合研究

發(fā)布時間:2018-08-20 10:52
【摘要】:磁致伸縮效應(yīng)及其產(chǎn)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(yīng)用獲得了國內(nèi)外學(xué)者的廣泛關(guān)注,成為非晶合金研究和應(yīng)用的新熱點。本文以傳感器應(yīng)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(guān)系,分析了共振性能優(yōu)化的機(jī)理。具體內(nèi)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(guān),最強(qiáng)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(yīng),可采用參數(shù)e=λ/H設(shè)計和選擇最佳工作點;制備出適合防盜標(biāo)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(yīng)力為60MPa時共振頻率fr為57.8KHz,共振幅值A(chǔ)1為372mV,品質(zhì)因素約為400。采用Kerr法觀察了非晶合金共振片的磁疇結(jié)構(gòu),分析了共振性能優(yōu)化的機(jī)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(jié)構(gòu)有關(guān),熱處理中形成尺寸小于30μm的細(xì)化條形疇,降低磁疇磁矩轉(zhuǎn)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(jié)果發(fā)現(xiàn)共振片彎曲變形對貼輥面和自由面的磁疇結(jié)構(gòu)具有相反的影響,橫向的拉應(yīng)力會使磁疇尺寸變大,而橫向的壓應(yīng)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(shù)λs≈14×10-6,磁彈性耦合系數(shù)為0.4以上的性能,為開發(fā)新型的應(yīng)力傳感器進(jìn)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

資料下載
論文發(fā)表

本文鏈接:http://www.wukwdryxk.cn/shoufeilunwen/gckjbs/2193330.html


Copyright(c)文論論文網(wǎng)All Rights Reserved | 網(wǎng)站地圖 |

版權(quán)申明:資料由用戶c8ccb***提供,本站僅收錄摘要或目錄,作者需要刪除請E-mail郵箱bigeng88@qq.com
樱桃视频大全免费高清版观看 | 国产产无码乱码精品久久鸭| 久久久AV波多野一区二区| 永平县| 51ⅴ精品国产91久久久久久| 亚洲精品久久久久久| 久久久福利| 国产麻豆果冻传媒| 欧美激情精品| 欧美一区2区三区4区贰佰公司| 欧美wwwxxx| 操东北熟女| 一区二区福利| 你微笑时很美电视剧整集高清不卡 | 免费黄色在线看| 综合一区| 精品无人乱码高清m5535| 欧美日韩精品| 日韩美女毛片| 国产激情精品| av不卡在线播放| 被男友按住猛啪好爽| 韩日欧美| 亚洲欧美偷拍另类a∨色屁股| 国产精品偷乱一区二区三区| 老师扒开双腿让我爽了一夜视频| 国产操| 91少妇| 国产777| 亚洲精品国自产拍在线观看| 成aⅴ人免费观看中文字幕| 国产成人免费a在线视频| 欧洲成人午夜精品无码区久久| 亚洲熟妇无码久久精品| 国产AV无码专区亚洲AV麻豆| 一区二三区好的精华液| 久久久一本精品99久久精品88| 欧美精品乱人伦久久久久| 国内精品久久久久影院蜜芽| 亚洲一区二区在线免费观看| 91新人酒店约极品美女|