GAS SENSING ELEMENT WITH INCREASED MECHANICAL STRENGTH

摘要

A gas sensing element for detecting a specified gas concentration in measuring gases is disclosed. The gas sensing element has at least a surface layer portion formed with an alumina composite sintered body having a principal component of alumina. The alumina composite sintered body contains alumina particles and dispersion particles, dispersed in a boundary between the alumina particles or in the alumina particles, which have an average particle diameter smaller than that of the alumina particles. The dispersion particles have particle-to-particle distances with an average of 4 mum or less and a standard deviation of 1.8 or less. The dispersion particles have particle diameters with an average of 0.2 mum or less and a standard deviation of 0.05 or less.