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为开发力敏性能更为优异的复合材料薄膜,首先,通过液相还原法制备了粒径约为100nm的纳米Fe50Ni50粉体,并通过液态混合分散工艺将纳米粉体与丁基橡胶(IIR)混合分散;然后,通过机械混炼及压制得到了粉体分布均匀、含量为65wt%的纳米Fe50Ni50粉体/IIR复合材料薄膜;最后,研究了在连续加载/卸载速度为0.10mm/min、测试频率为1kHz的条件下,纳米Fe50Ni50粉体/IIR复合材料薄膜的力敏特性。结果表明:液态混合分散工艺可使Fe50Ni50粉体在复合材料薄膜中达到纳米级均匀分散效果;当压应力为0.20~0.90 MPa时,薄膜越厚,其标准偏差越大,力敏稳定性越差;随压应力增大,厚度为185μm的薄膜在加载阶段的阻抗近似线性下降,力敏灵敏度稳定在40~60范围内,标准偏差约为1~2。所得结论表明在压应力为0.20~0.90MPa时,制备的薄膜具有优异的力敏特性。
In order to develop composite films with better force-sensitive properties, firstly, nano-sized Fe50Ni50 powders with particle size about 100nm were prepared by liquid-phase reduction method. The nano-powders were mixed with butyl rubber (IIR) Mixed and dispersed; then, nano-Fe50Ni50 powder / IIR composite film with uniform powder distribution and content of 65wt% was obtained by mechanical mixing and pressing; finally, the effects of continuous loading / unloading speed of 0.10mm / Force Sensitivity of Nanocrystalline Fe50Ni50 Powder / IIR Composite Films at 1kHz Frequency. The results show that the liquid dispersion process can make the Fe50Ni50 powder disperse evenly in nanocomposites. When the compressive stress is 0.20 ~ 0.90 MPa, the thicker the film, the larger the standard deviation is, the worse the force-sensitive stability With the increase of compressive stress, the impedance of the film with a thickness of 185μm decreases approximately linearly during the loading phase, and the sensitivity of sensitivity is stable within the range of 40-60 with a standard deviation of about 1-2. The conclusions obtained show that the films prepared have excellent force-sensitive properties under compressive stress of 0.20 ~ 0.90MPa.