GLOWPLUG, PRODUCTION METHOD THEREOF AND HEATING DEVICE

摘要

The disclosed glowplug (1) is provided with a cylindrical tube (7) that is closed at the tip, a heating coil (9) that is inserted into the tube (7), and a seal (11) that is provided to the open rear end of the tube (7) and seals the tube (7). The heating coil (9) is formed by a metal member that has tungsten (W) or molybdenum (Mo) as the primary component and the tube (7) is formed from an alloy that contains 0.5-5.0 mass% aluminium (Al) and 20-40 mass% chromium (Cr). Due to the tube (7) containing Al and Cr in designated amounts, as well as the tube having high anti-oxidation properties, the oxygen partial pressure within the tube (7) is reduced and the oxidation of the heating coil (9) can be controlled. As a result, the durability of both the heating coil (9) and the tube (7) is increased and high temperature heating over a long period is possible.