| 摘要 |
PURPOSE:To obtain a small-sized element having good detection accuracy and giving a good linearity for its resistance value corresponding to the variation of gas components even in a low temperature range of exhaust gas temperature, by forming a gas sensitive body consisting essentially of WO3 on a comb-shaped electrode formed on the surface of a ceramic substrate. CONSTITUTION:A comb-shaped electrode is formed on the surface of a ceramic substrate by printing gold paste and Pt lead wire is fixed to a terminal part with the gold paste and hereafter, is baked. Next, paste added SiO2 to WO3 powder for increasing adhesive strength is put into 100 mesh screen print on the comb-shaped electrode and said electrode is calcined at 600-1,000 deg.C after drying to complete a detection element. Hereby, resistance value of this element has a good linearity corresponding to the variation of exhaust gas components of internal combustion engine of a motor car etc. and the equivalent ratio of air- fuel is measured in the range of 200-500 deg.C with good accuracy. |
