Ngk Spark Plug Company, Limited

Koichi Imaeda

Takao Kojima

Yoshiaki Kuroki

Yoshiro Noda

Yutaka Adachi

Ryohei Aoki

Sinya Awano

Takafumi Oshima

Noboru Ishida

Hitoshi Yokoi

Ryuji Inoue

Satoshi Sugaya

Shiro Kakimoto

Tadashi Hattori

Hiroyuki Nishiyama

Atsushi Satsuma

In an ammonia sensor (), lead portions () and () are provided on an insulating substrate (); a pair of comb-shaped electrodes () and () are connected to the lead portions () and (), respectively; a sensitive layer () is provided on the comb-shaped electrodes () and (); and a protective layer () is provided on the sensitive layer (). Particularly, the sensitive layer () is formed of a gas-sensitive raw material predominantly containing ZrOand containing at least W in an amount of 2 to 40 wt. % as reduced to WO.

Ammonia sensor

A solid electrolyte layer or body capable of being co-fired with an insulating ceramic substrate or body to be used as a gas sensor laminate. The gas sensor laminate is preferably composed of an alumina substrate () and an oxygen-ion conductive solid electrolyte layer () bonded to the alumina substrate () by firing. The oxygen-ion conductive solid electrolyte layer or body is formed from partially or wholly stabilized zirconia, which layer contains alumina in an amount of 10% to 80% by weight, particularly 30% to 75% by weight. In this manner, another ceramic layer; particularly, a ceramic layer () of alumina can further be bonded to the oxygen-ion conductive solid electrolyte layer. The relative density of the ceramic layer can be 60% to 99.5%, preferably 80% to 99.5%.

Solid electrolyte containing insulating grains for gas sensor

A solid electrolyte layer or body capable of being co-fired with an insulating ceramic substrate or body to be used as a gas sensor laminate. The gas sensor laminate is preferably composed of an alumina substrate ( ) and an oxygen-ion conductive solid electrolyte layer ( ) bonded to the alumina substrate ( ) by firing. The oxygen-ion conductive solid electrolyte layer or body is formed from partially or wholly stabilized zirconia, which layer contains alumina in an amount of 10% to 80% by weight, particularly 30% to 75% by weight. In this manner, another ceramic layer; particularly, a ceramic layer ( ) of alumina can further be bonded to the oxygen-ion conductive solid electrolyte layer. The relative density of the ceramic layer can be 60% to 99.5%, preferably 80% to 99.5%.

Solid electrolyte containing insulating ceramic grains for gas sensor

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Aichi, Japan

Koichi Imaeda