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Composite films of different contents were prepared by Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9 powder as compound phase and silicone rubber as matrix phase.The thickness of film is 200 um.Values of impedance,Z,under pressure stress were measured by TH2816 LCR digital bridge.LYYL-500 N high-grade-type microcomputer control pressure testing machine was used to conduct program control loading with a speed of 0.1 mm·min~(-1).The results show that composite films of different contents(25 vol%,30 vol%,and 35 vol%) have excellent force-sensitive properties in both loading process and unloading process,especially when the stress is below 0.2 MPa,the stressimpedance(SI) and |k| values of composite films are much higher than that in the range of 0.2-1.0 MPa.The forcesensitive properties of loading process are superior to unloading process.While the frequency is 1 kHz,the force-sensitive properties of composite films are better than50 kHz.The optimal temperature of powder heat treatment is 500 ℃.Composite film which was prepared by this kind of powder has a good force-sensitive property.
Composite films of different contents were prepared by Fe_ (73.5) Cu_1Nb_3Si_ (13.5) B_9 powder as compound phase and silicone rubber as matrix phase. The thickness of film is 200 um.Values of impedance, Z, under pressure stress were measured by TH2816 LCR digital bridge. LYYL-500 N high-grade-type microcomputer control pressure testing machine was used to conduct program control loading loading with a speed of 0.1 mm · min -1. The results show that composite films of different contents (25 vol %, 30 vol%, and 35 vol%) have excellent force-sensitive properties in both loading process and unloading process, especially when the stress is below 0.2 MPa, the stressimpedance (SI) and | k | values of composite films are much higher than that in the range of 0.2-1.0 MPa.The forcesensitive properties of loading process are superior to unloading process. Whilst the frequency is 1 kHz, the force-sensitive properties of composite films are better than 50 kHz. The optimal temperature of powder heat treatment is 500 ℃ .Composi te film which was prepared by this kind of powder has a good force-sensitive property.