分别对短切碳纤维和炭黑填充的硅橡胶基导电复合材料试样进行了单次与循环压缩试验,研究两种复合材料的压敏特性及可重复性。测试结果表明,两种导电复合材料都具有较好的压缩敏感性;碳纤维填充时,试样的灵敏度较高,达到250左右,且电阻相对值与应变之间基本呈线性关系;炭黑填充时,试样具有较好的可重复性,但灵敏度较差。通过导电机理研究,对两种导电复合材料不同的导电敏感特性进行了分析。
The compression-sensitivity and repeatability of short carbon fiber/carbon black-silicone rubber conductive composites were studied by single and circular compression test.The results show that both conductive composites have better compression-sensitivity.The composites carbon fiber filled have high sensitivity（gage factor about 250） and have linear relationship between the value of relative resistance and strain while the composites filled with carbon black have better reproducibility,but poor sensitivity.The sensitivity of the two composites are analyzed through the conductive mechanism.
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