ニッケル被覆カーボン繊維を充填した面状発熱体の電気および発熱特性

抄録

Polymer composites filled with electrical conductive fillers are used in various industrial fields, and some of these materials show a positive temperature coefficient resistivity (PTC). This phenomenon is ascribed to volume expansion of the matrix polymer. By applying the PTC effect, these electrically conductive materials are able to be used as self-temperature control plane heater.
In this study, new type of plane heater, different from ordinary plane heaters, with a rigid network structure filled with conductive fillers was prepared by a new processing method. First of all, the characteristics of the matrix urethane resin such as curing conditions and thermomechanical properties were investigated. This resin mixed with short nickel coated carbon fibers having different fiber lengths or aspect ratios was processed in to thin sheets and cured. The relationship between resistivity and fiber content and the influence of environmental temperature on resistivity of these composites were investigated experimentally. The relationship between heating properties and resistivity of the materials under supplied voltage and also the influence of environmental temperature on heating temperature were also discussed.