公开(公告)号：US4045178A

公开(公告)日：1977-08-30

申请号：US738745

申请日：1976-11-03

申请人： Hideyuki Okinaka ,  Atsushi Iga ,  Masatake Ayusawa ,  Masatugu Yamaguchi ,  Seiichi Nakatani ,  Toshiaki Yagami

发明人： Hideyuki Okinaka ,  Atsushi Iga ,  Masatake Ayusawa ,  Masatugu Yamaguchi ,  Seiichi Nakatani ,  Toshiaki Yagami

IPC分类号： G01N27/12

CPC分类号： G01N27/12

摘要： This invention provides a reducing gas sensor which has a gas sensitive element composed of, as a main constituent, .gamma.-ferric oxide (.gamma.-Fe.sub.2 O.sub.3) and, as an additive, at least one compound in the group of WO.sub.3, MoO.sub.3, SiO.sub.2, GeO.sub.2, Li.sub.2 O, Na.sub.2 O, K.sub.2 O, CaO, SrO, BaO, Eu.sub.2 O.sub.3, La.sub.2 O.sub.3, CeO.sub.2, Al.sub.2 O.sub.3, Ga.sub.2 O.sub.3, In.sub.2 O.sub.3, SnO.sub.2, TiO.sub.2, MgO, NiO, ZnO, Mn.sub.2 O.sub.3 and Cr.sub.2 O.sub.3, a pair of electrodes and a heater element. The .gamma.-ferric oxide is in the form of a thin film, a plate or a thin surface layer on a sintered plate of .gamma.-ferric oxide. The gas sensor of the invention is much improved in the stability during use and also it has a high sensitivity.

摘要翻译： 本发明提供了一种还原气体传感器，其具有作为主要成分的γ-氧化铁（γ-Fe 2 O 3）和作为添加剂的至少一种WO 3，MoO 3，SiO 2， GeO2，Li2O，Na2O，K2O，CaO，SrO，BaO，Eu2O3，La2O3，CeO2，Al2O3，Ga2O3，In2O3，SnO2，TiO2，MgO，NiO，ZnO，Mn2O3和Cr2O3，一对电极和加热元件。 γ-氧化铁是在γ-氧化铁烧结板上的薄膜，板或薄表面层的形式。 本发明的气体传感器在使用过程中的稳定性方面得到很大改进，并且其灵敏度高。

公开(公告)号：US3999947A

公开(公告)日：1976-12-28

申请号：US618680

申请日：1975-10-01

申请人： Toshihiro Mihara ,  Masatake Ayusawa ,  Keiji Matsumoto ,  Kunio Sato ,  Yoshio Iida

发明人： Toshihiro Mihara ,  Masatake Ayusawa ,  Keiji Matsumoto ,  Kunio Sato ,  Yoshio Iida

IPC分类号： G01N27/12 ,  G01N27/00 ,  G01N33/00

CPC分类号： G01N27/12

摘要： This invention provides a reducing gas sensor which has a gas sensitive element of .gamma.-ferric oxide (.gamma.-Fe.sub.2 O.sub.3), a pair of electrodes and a heater element. The .gamma.-ferric oxide is in the form of a thin film, a plate or a thin surface layer on a sintered plate of .alpha.-ferric oxide. This invention also provides a method of producing the reducing gas sensor, which includes the steps of firing .gamma.-Fe.sub.2 O.sub.3, .gamma.-FeOOH or Fe.sub.3 O.sub.4 powder on a substrate and applying thereto a pair of electrodes and a heater element; or sintering alpha-ferric oxide (.alpha.-Fe.sub.2 O.sub.3) and reducing it to magnetite and oxidizing it at the surface thereof to .gamma.-ferric oxide as a gas sensitive element. The sensitivity (R.sub.A /R.sub.G) of the gas sensitive element of .gamma.-ferric oxide is 10 to 130.degree. at 270.degree. C in an atmosphere containing 0.1 to 1 percent by volume propane gas, and the reducing gas sensor has high sensitivity and stability.

摘要翻译： 本发明提供一种还原气体传感器，其具有γ-氧化铁（γ-Fe 2 O 3）气体敏感元件，一对电极和加热元件。 γ-氧化铁是在α氧化铁烧结板上的薄膜，板或薄表面层的形式。 本发明还提供一种还原气体传感器的制造方法，其特征在于包括以下步骤：将γ-Fe 2 O 3，γ-FeOOH或Fe 3 O 4粉末烧在基片上，并施加一对电极和加热元件; 或烧结α-氧化铁（α-Fe 2 O 3）并将其还原成磁铁矿并将其在表面氧化成作为气体敏感元件的γ-二氧化铬。 在含有0.1〜1体积％丙烷气体的气氛中，γ-氧化铁气敏元件的灵敏度（RA / RG）在270℃为10〜130℃，还原气体传感器具有高灵敏度和稳定性。