Solid electrolyte and gas sensor
A technology of solid electrolyte and gas sensor, applied in instruments, scientific instruments, non-metallic conductors, etc., can solve problems such as cracks, zirconia phase transition, etc., and achieve excellent thermal shock resistance
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Embodiment approach 1
[0046] refer to Figure 1 to Figure 18 Embodiments of the solid electrolyte will be described. In the following description, the cubic phase is appropriately referred to as "C phase", the monoclinic phase is appropriately referred to as "M phase", and the tetragonal phase is appropriately referred to as "T phase". like figure 1 As illustrated, solid electrolyte 1 is composed of a plurality of crystal grains 2 . Among the crystal phases of crystal grains 2 , there are forms of C phase 21 , M phase 22 , and T phase 23 .
[0047] The solid electrolyte 1 is formed of stabilized zirconia or partially stabilized zirconia. Stabilized zirconia and partially stabilized zirconia are so-called sintered bodies, and the stabilizer is dissolved in zirconia.
[0048] Examples of the stabilizer include yttrium oxide, calcium oxide, magnesium oxide, scandium oxide, and ytterbium oxide. Stabilized zirconia and partially stabilized zirconia may contain at least one of the above substances a...
Embodiment approach 2
[0067] Embodiments of the gas sensor will be described. It should be noted that, among the symbols used in Embodiment 2 and later, the symbols that are the same as the symbols used in the previous embodiments represent the same configuration as those in the previous embodiments unless otherwise specified. elements etc.
[0068] The gas sensor 5 of the present embodiment is as 19 and Figure 20 A sensor element 6 is provided as shown. The sensor element 6 of this embodiment is a gas sensor element that detects gas. The sensor element 6 has a solid electrolyte 1 , a detection electrode 62 , a reference electrode 63 and a diffusion barrier 66 . That is, the gas sensor 5 includes the solid electrolyte 1 in the sensor element 6 . Detection electrode 62 and reference electrode 63 are formed on both surfaces 601A, 602A of solid electrolyte 1 , respectively. The detection electrode 62 and the reference electrode 63 form a pair of electrodes formed at positions facing each other. ...
experiment example 1
[0094] Several solid electrolytes were fabricated and their performances were compared and evaluated. Hereinafter, a method for producing the solid electrolyte in this example will be described. In the manufacture of solid electrolytes, such as Figure 22 As illustrated, at least the mixing step S1, the firing step S2, and the annealing step S3 are performed, but in this example, the molding step is performed after the mixing step and before the firing step.
[0095] like Figure 22 As illustrated, first, yttrium oxide powder is added to zirconia powder at a desired ratio, followed by dry mixing and pulverization. Thus, a mixed powder was obtained.
[0096] Next, the mixed powder is mixed with water to obtain a mixed powder slurry. Granulation of the mixed powder slurry is performed in order to improve the fluidity of each raw material particle constituting the mixed powder and to facilitate molding into a desired shape. Granulation is performed, for example, by spray gra...
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