Patent ID: 8653932

Claim:
A positive-temperature coefficient (PTC) conductive composite material, comprising: a matrix of crystalline polymer material at least, occupying 20%-70% of the volume fraction of the PTC conductive composite material; and a conductive filler occupying remaining volume fraction of the PTC conductive composite material, wherein the conductive filler is dispersed in the crystalline polymer material, the conductive filler having an average particle size ranging from 0.1 μm to 10 μm, and a volume resistivity no more than 300 μΩ·cm, and wherein the conductive filler is one of tantalum carbide-niobium carbide solid solution, chromium carbide-titanium carbide-tantalum carbide solid solution, titanium carbide-tungsten carbide-tantalum carbide solid solution, titanium carbide-tungsten carbide-niobium carbide solid solution, titanium carbide-tungsten carbide solid solution, titanium carbide-tungsten carbide-niobium carbide-tantalum carbide solid solution, tungsten carbide-tantalum carbide solid solution, and titanium carbide-tantalum carbide solid solution.