| 摘要 |
PROBLEM TO BE SOLVED: To provide filling powder for a seal for air-tightly sealing and supporting an element for detecting a gas to be detected in exhaust gases at a main body metal fixture. SOLUTION: In this gas sensor, the element 2 is arranged in the hollow part 101 of the main body metal fixture 1. By filling the gap between the element 2 and main body metal fixture 1 with inorganic powder 4, the gap between the element 2 and main body metal fixture 1 is air-tightly sealed. By using a material with no exothermic peak at 700 deg.C or less in differential thermal analysis for the inorganic powder, the airtightness between the element 2 and main body metal fixture 1 is not degraded even in a high-temperature use environment at 600 deg.C or more. A powder of tale formed of SiO2 and MgO can be used as the inorganic powder, and binders such as water glass are not mixed so that the inorganic powder may have no exothermic peak at 700 deg.C or less in differential thermal analysis. For securing compactibility, raw ore crushed into a particle diameter of 400-600μm is used as the powder.
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