Electrical Resistivity and NTC/PTC Transition Point of a Nitrogen-Doped SiC Igniter, and Their Correlation to Electrical Heating Properties

Abstract

An M-shaped SiC gas igniter was fabricated by a reaction sintering followed by nitrogen doping. The igniter showed both resistivity at room temperature and NTC to PTC transition temperature values that were lower than those of commercial igniters. It was deduced that the doped nitrogen reduces the electrical resistivity at room temperature, while, at high temperature, the doped nitrogen and a trace of Si 3 N 4 phase work as scattering centers against electron transfer, resulting in a lowered NTC-to-PTC transition point (below 650 o C). Such characteristics were correlated to the fast heating speed (as compared to the commercial models) and to the prevention of the high temperature overshooting of the nitrogen-doped SiC igniter.

Preparation of Si3N4/V2O5 Composite Films for Negative Temperature Coefficient Materials

“…2 NTC thermally sensitive ceramic devices are fabricated using metal oxides such as copper, nickel, cobalt, and aluminum as the primary raw materials. 3,4 Due to their exceptional temperature sensitivity and broad measurement range, they exhibit rapid response capabilities at a reduced cost. Consequently, these devices have found extensive applications in flow measurement, temperature monitoring, and control systems.…”

“…Nonlinear temperature sensors, also known as thermistors, demonstrate a higher level of sensitivity toward temperature response . NTC thermally sensitive ceramic devices are fabricated using metal oxides such as copper, nickel, cobalt, and aluminum as the primary raw materials. , Due to their exceptional temperature sensitivity and broad measurement range, they exhibit rapid response capabilities at a reduced cost. Consequently, these devices have found extensive applications in flow measurement, temperature monitoring, and control systems. − The vanadium oxide (VO x ) is widely recognized as one of the commonly employed active thermally sensitive materials due to its high temperature resistivity coefficient (TCR) and relatively low resistivity characteristics. , The valence state of V in V 2 O 5 is the highest among various VO x .…”