镍粉/环氧树脂复合材料的压敏性

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Abstract The measurement method of electrical resistivity of nickel powder filled epoxy resin composites was explored. The variation regularity of electrical resistivity of nickel powder filled epoxy resin composites with different contents of nickel powder and flexible epoxy resin under uniaxial compression was studied. The generation mechanism of piezoresistivity of nickel powder filled epoxy resin composites was discussed according to static electrical resistivity and variation in volume of composites under compression. The research results show that the electrical resistance of composites measured with the direct current two-electrode method is consistent with that measured with the direct current four-electrode method, which indicates that the direct current two-electrode method is feasible for measurement of electrical resistivity of this kind of composites. The fabricated nickel powder filled epoxy resin composites have good piezoresistivity. The absolute value of the fractional change in electrical resistivity reaches 69.98% maximum under compressive stress in a range from 0MPa to 12.5MPa. The sensitivity of piezoresistivity of nickel powder filled epoxy resin composites increases when the content of nickel powder decreases and the content of flexible epoxy resin increases. The generation of piezoresistivity of this kind of composites is due to the enhancement of tunnel effect, which is caused by the decrease in volume of composites under compression.

Key words： Nickel powder epoxy resin piezoresistivity stress/strain electrical resistivity

Received: 25 June 2009 Published: 07 March 2014

PACS:

TB381

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	Han Baozhong
	Zhou Daocheng
	Han Baoguo

Cite this article:

Han Baozhong,Zhou Daocheng,Han Baoguo. Piezoresistivity of Nickel Powder Filled Epoxy Resin Composites[J]. Transactions of China Electrotechnical Society, 2011, 26(4): 1-6.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2011/V26/I4/1

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