Ngk Spark Plug Company, Limited

Yasuhiro Fujii

Takeshi Mitsuoka

Katsuya Yamagiwa

Masato Yamazaki

Kohei Ito

Daisuke Miyata

Naoyuki Sugihara

Kensuke Mizutani

Kengo Simizu

A gas sensor () has a sensor element () extending in an axis direction and having, at a top end side thereof, a detecting portion () that detects gas; a stainless steel-made tubular metal shell () enclosing a radial direction periphery of the sensor element () and holding the sensor element () and having (a) a brim portion () protruding outwards in a radial direction and (b) a crimp portion () formed at a rear end side of the metal shell (); and a sealing member () placed between the sensor element () and the metal shell (). The crimp portion () is bent inwards in the radial direction and pressing down a rear end of the sealing member () toward the top end side. A Micro Vickers hardness of a cross section along the axis direction of the crimp portion () is 140 to 210 Hv.

Gas sensor

There is provided a piezoelectric ceramic composition that contains Na, Bi, Ti and Co wherein the composition ratio of Na, Bi, Ti and Co in terms of oxides thereof is in the following composition range (1):NaO-BiO-TiO-CoO&#x2003;&#x2003;(1)where a, b, c and d are mole fractions; 0.03&#x2266;a&#x2266;0.042; 0.330&#x2266;b&#x2266;0.370; 0.580&#x2266;c&#x2266;0.620; 0&#x3c;d&#x2266;0.017; and a+b+c+d=1.

Piezoelectric ceramic composition and piezoelectric device

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Kitanagoya, Japan

Yasuhiro Fujii