| Title |
TiC Volume Fraction Dependence of the Electrical Resistivity and PTC Property for TiC Added PMC (polyethylene matrix composites) |
| DOI |
https://doi.org/10.3365/KJMM.2012.50.5.407 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
composites; extrusion; electrical properties; resistivity |
| Abstract |
TiC added PMC (polyethylene matrix composites) have been prepared with various volume fractions of TiC. Two types of TiC powder with their different particle diameters, 1.5㎛(TiC-1.5 PMC) and 90㎛(TiC-90 PMC), were utilized in the present research. The electrical resistivities of the PMC decreased gradually with increasing TiC volume fraction (V); in the case of smaller particle size, the value of the electrical resistivities at room temperature jumped down in the relatively narrow range of V=0.40-0.42, reaching as low as 0.1 Ωcm. The temperature dependencies of electrical resistivities were also measured to examine the possible application of the PMC to PMC PTC thermistors. The resistivity showed a positive temperature dependence and changed abruptly in the tenth order of its magnitude during the melting transition of the polyethylene matrix. The electric current-cutoff characteristics of the PMC indicated excellent features in the over current response despite their low resistivity values, as compared with those of other PTC materials. |