以粒径为45μm 的 Fe73.5 Cu1 Nb3 Si13.5 B9非晶粉体为复合相,丁基橡胶为基体相,利用模压成型法制备了粉体含量为85%、厚度为150和200μm 的复合薄膜。采用LYYL-500N高档型微机控制压力试验机对薄膜试样进行连续加载/卸载实验(速度分别为0.1,0.5和1.0 mm/min),用 TH2816LCR 数字电桥测试频率1和50 kHz下薄膜的阻抗Z 值。研究了加载/卸载速度、测试频率、薄膜厚度和环境温度对 Fe-CuNbSiB粉体/丁基橡胶力敏特性的影响。研究表明,复合薄膜在v=0.1 mm/min 时,其重复性最好,在加载过程中,应力灵敏度|k|值随着应力的增大呈现先增大后减小的变化趋势,卸载过程中,|k|值随着应力的逐渐减小而增大。在1 kHz测试频率下复合薄膜的力敏灵敏度高于50 kHz。相同测试条件下,厚度为200μm的复合薄膜的力敏灵敏性略优于150μm 的。在39.5~80℃温度范围内,随着温度的升高复合薄膜的灵敏度越高。
Composite film was prepared by molding method with amorphous Fe73.5 Cu1 Nb3 Si13.5 B9 powder as compound phase and butyl rubber as matrix phase.The particle size was 45μm,the content of powder was 85%and the thickness of film was 150 or 200μm.LYYL-500N high-grade type microcomputer control pressure tes-ting machine was used to conduct program control loading with speed of 0.1,0.5 and 1.0 mm/min.Values of impedance,Z,under pressure stress were measured by TH2816LCR digital bridge with 1 and 50 kHz.The pa-per study the effect of loading speed,testing frequency,film thickness and testing temperature on force-sensi-tive properties.The results show the force-sensitive stability property was best,when the loading speed was 0. 1 mm/min.The sensitivity (|k|)of composite films increase firstly then decrease with the increasing stress during loading process,while it increase with the decreasing stress during uploading process.While the fre-quency was 1 kHz,the force-sensitive sensitivity of composite films are better than 50 kHz.The force-sensitive sensitivity of 200μm process are superior to 150μm.The higher temperature is,the better sensitivity of com-posite film is.
参考文献
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