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Electrical properties of composites of hard metal carbides in a polymer matrix
Author(s) -
Vilčáková Jarmila,
Sáha Petr,
Hausneroná Berenika,
Quadrat Otakar
Publication year - 2002
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.10491
Subject(s) - materials science , composite material , composite number , electrical resistivity and conductivity , carbide , filler (materials) , metal , drop (telecommunication) , polymer , conductivity , matrix (chemical analysis) , particle (ecology) , metallurgy , telecommunications , chemistry , oceanography , geology , computer science , electrical engineering , engineering
The electrical conductivity of composites containing hard metal carbide powder in a nonconducting polymer matrix has been studied. In composites with low and medium filler contents, the expansion of the nonconducting matrix with increasing temperature caused interruption of conducting paths and a rapid drop in conductivity (switching effect). In contrast, at high filler loadings (Φ P > 50 vol%), a continuous and slight decrease in conductivity with temperaute inducates a specific composite structure with a dense particle arrangement and a great number of conducting contants, which change only little during heating.