Production of insulating layer for heater for probe for determining oxygen concentration in gas mixture, e.g. internal combustion engine exhaust gas involves sintering barium and/or strontium oxide with alumina

摘要

Production of an insulating layer (60) for a heater (50) for a probe (10) for determining the oxygen concentration in gas mixtures, especially exhaust gases from internal combustion engines, comprises sintering a mixture of (a) barium oxide, strontium oxide and/or compounds forming such oxides on thermal treatment and (b) alumina.