METAL-OXIDE SINTERED BODY FOR TEMPERATURE SENSOR, AND METHOD FOR MANUFACTURING SAME

摘要

A metal-oxide sintered body for a temperature sensor that can be installed in a combustion engine and components connected to the engine in order to sense temperature uses metal oxide. The metal-oxide sintered body has particles with large resistance values and particles with small resistance values mixed therein. The particles with the small resistance values may serve as a main resistance component in the temperature range of 0° C. to 500° C., and the particles with the large resistance values may contribute to the total resistance in proportion to the mixing ratio in the temperature range of 500° C. to 900° C. Thus, the metal-oxide sintered body enables a single sensor to measure all resistances, and can be used in an exhaust device or the like of a motor vehicle that requires temperature measurement over a wide range of temperatures.

主权项

1. A method for producing a metal-oxide sintered body, the method comprising the steps of:
a) mixing ZrO2 with one or more materials serving to stabilize ZrO2, and selected from the group consisting of Al2O3, Y2O3, CeO2, MgO, SiO2, Ta2O5 and ThO2, followed by heat treatment at a temperature equal to or higher than ½ of the melting temperature of ZrO2, to prepare stabilized zirconia (ZrO2) powder; b) heat-treating a composition having a formula of Mn0.27Fe0.16Ni0.27Y0.2Al0.1O1.5 at a temperature ranging from 1,000° C. to 1,500° C. for 1-5 hours to prepare powder; and c) mixing the powder prepared in step a) with the powder prepared in step b) to prepare a mixture, and heat-treating the mixture at a temperature ranging from 1,100° C. to 1,700° C. for 30 minutes to 2 hours, thereby producing a sintered metal-oxide having a formula of Mn0.108Fe0.064Ni0.108Y0.28Al0.04Zr0.402O1.701.