【作者】 李塘华；

【导师】 朱正吼；

【作者基本信息】 南昌大学 ， 材料学， 2007， 硕士

【摘要】 传感器是实现测试与自动控制的首要环节。压磁式传感器是近几年来国内外新兴的一种新型传感器,对其磁性材料的选择是一项急需解决的关键技术。本文首先在丁基橡胶中复合Fe_73.5Cu₁Nb₃Si_13.5B₉非晶、纳米晶软磁合金粉体,制得了不同系列的复合材料薄膜。研究了频率、压应力、粉体粒度、粉体含量、薄膜厚度对复合薄膜压磁性能的影响;其次研究了不同退火态粉体对复合薄膜压磁性能的影响情况和复合薄膜压磁性能的温度特性。研究表明,所制得复合薄膜的压磁性能在小于200kHz的较低频段、小于200kPa的较小压应力时具有优秀的压磁性能。其中,以经500℃×0.5h热处理、粒径为D₉₀38μm、粉体含量75wt%的粉体复合得到厚度100μm的薄膜压磁性能最好。测试温度对复合薄膜的压磁性能具有很大的影响,非晶复合薄膜和纳米晶复合薄膜分别在40℃、50℃时具有最好的压磁性能。更多还原

【Abstract】 Sensor is the first link in the implementation of test and automatic control. Magneto-elastic sensor is a new type of sensor in the world in recent years. The choice of magnetic materials is a key technology to be solved on magneto-elastic sensor.Some types of soft magnetic composite films based on butyl rubber, were preparated with a series of amorphous and nancrystalline Fe_73.5Cu₁Nb₃Si_13.5B₉ soft magnetic alloy powders, and their magnetoelastic properties were studied preliminarily. The influence factors on magnetoelastic properties such as testing frequency, stress, powder’s size, powder content, film’s thickness, powder’s heat-treatment process were studied, and then, the influence of amorphous powders annealing states and test testing temperature was studied. The result shows the films have excellent piezomagnetic properities when frequency being below 200kHz and stress being below 200kPa, and film of thickness 110μm, powder content 75wt% , powder heat-treated in the way of 500℃for 0.5h, has the best piezomagnetic properity. Testing temperature has significantly influence on films’ piezomagnetic properties. The films composited with amorphous Fe_73.5Cu₁Nb₃Si_13.5B₉ powders have the best piezomagnetic properties at 40℃,at the same time, the films composited with nano-crystalline Fe_73.5Cu₁Nb₃Si_13.5B₉ powders having the best piezomagnetic properties at 50℃.更多还原