Ssangyong Cement Industrial Co., Ltd.

Han S Song

Ki Seong Kim

Young Hyo Yoo

Joong K Lee

Joon T Kim

Dae J Ko

Sung T Kwon

Geun C Yum

An oxygen sensor probe for a boiler including a U-shaped zirconia element that is to be brought in contact with an exhaust gas in the interior of a cylindrical probe body attached to a plug and arranged together with a thermocouple in the longitudinal direction of the body. A heater for heating the element is provided around the periphery of the element and a protective filter is provided on the top portion of the body. The probe is characterized by the U-shaped zirconia element 11 being located at an upper end of the probe body 12 with its concave open portion 11' facing upwards to be contacted with the exhaust gas while its convex closed portion 11' faces downward to be confronted with the thermocouple 16. Also included is packing material 15 for sealing the space between the upper end 13 of the element 11 and the plug 14, a heater 17 located in the periphery of the closed portion 11' of the element 11 for heating the element, and a support 19 located between the plug 14 and the heater 17 for protecting an electrode contact and supporting the heater.

Oxygen sensor probe for boiler

A method for manufacturing a sintered Al.sub.2 O.sub.3 -TiC system containing Y.sub.2 O.sub.3 is described in which TiC has been treated, in the presence of a mixed gas of nitrogen and oxygen, to provide a TiO.sub.2 layer on the TiC particles.

Method for manufacture of a sintered body of Al.sub.2 O.sub.3 -Tic

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Taejeon, South Korea

Han S Song