TiC 첨가 PMC에 있어서 전기저항의 TiC 체적분율 의존성과 PTC특성

• Published in: 대한금속·재료학회지, 50(5) Vol. 50; no. 5; pp. 407 - 412
• Main Authors: 신순기, Soon Gi Shin
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 20.05.2012; 대한금속·재료학회
• Subjects: composites; electrical properties; extrusion; resistivity; 재료공학
• ISSN: 1738-8228; 2288-8241

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.