Production of gas detection element

Abstract

Abstract PURPOSE:To obtain a detection element which exhibits the balanced and satisfactory sensitivity to three kinds of gases, methane, butane and hydrogen by contg. 25-50wt% In2O3 and the balance SnO2 in raw material formulation, and determining the ratio of the effective amt. of the PdO to be added with respect to the total amt. of In2O3 and SnO2 as determined by the specific formula at 0.06-3.0wt%. CONSTITUTION:The formulation of three components is so selected in the stage of mixing raw materials that In2O3 is contained at 25-30wt% and the balance is SnO2, that is, 75-50%. PdO is used within the range where the effective amt. to be added as determined by the formula I is 0.06-3.0% with respect to the total amt. of In2O3 and SnO2. If In2O3 exceeds 50%, the problem that the sensititivity to hydrogen and butane decreases as compared to methane. If SnO2 exceeds 75%, the sensitivity to hydrogen in a high concn. decreases. If the effective amt. of the PdO to be added exceeds 3%, an allowance E in level setting decreases. If the effective amt. of the PdO to be added is <0.06%, the sensitivity to methane is vanished.

Inventors

• 👤 Masayuki Ishihara
• 👤 政行 石原
• 👤 Shigekazu Kusanagi
• 👤 草薙　繁量
• 👤 Toru Nobetani
• 👤 延谷　徹
• 👤 Masaharu Fujii
• 👤 雅春 藤井

Bibliographic Details