Solid electrolyte for gas sensor and gas sensor
A solid electrolyte, gas sensor technology, applied in the direction of instruments, scientific instruments, non-metallic conductors, etc., can solve the problems such as the decrease of the strength of the solid electrolyte, and achieve the effect of excellent strength
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Embodiment approach 1
[0034] refer to Figure 1 ~ Figure 4 Embodiments of the solid electrolyte will be described. Such as figure 1 As shown, the solid electrolyte 1 consists of partially stabilized zirconia 2 . Partially stabilized zirconia 2 is a so-called sintered body. Partially stabilized zirconia 2 is a sintered body in which a stabilizer is solid-dissolved in zirconia, and is composed of a plurality of crystal grains 3 .
[0035] Examples of stabilizers include yttrium oxide, calcium oxide, magnesium oxide, scandium oxide, and ytterbium oxide. Partially stabilized zirconia may contain at least one of them as a stabilizer.
[0036] Such as figure 1 As illustrated, the partially stabilized zirconia 2 contains a plurality of low-concentration phase particles 31 as crystal grains 3 constituting it. The low-concentration phase particles 31 are crystal grains with a stabilizer concentration lower than 4.7 mol%. The crystal system of the crystal phase in the low-concentration phase particl...
experiment example 1
[0073] A plurality of solid electrolytes related to Examples and Comparative Examples were produced, and their performances were evaluated by comparison. The method for producing the solid electrolyte in this example will be described below.
[0074] First, yttrium oxide powder and zirconia powder having a d50 particle diameter of 0.30 μm were mixed and sized. In addition, zirconia particles were agglomerated with each other by heat-treating zirconia powder having a d50 particle diameter of 0.7 μm at 700° C. Thus, a zirconia aggregated powder in which clusters of zirconia particles were formed was obtained.
[0075] Next, zirconia aggregated powder is mixed in the mixture of zirconia powder and yttrium oxide powder. The zirconia powder having a d50 particle size of 0.30 μm corresponds to the above-mentioned first raw material powder, and the zirconia aggregated powder corresponds to the above-mentioned third raw material powder. The yttrium oxide powder corresponds to the a...
experiment example 2
[0098] A plurality of solid electrolytes were produced in the same manner as in Experimental Example 1, and their performance was evaluated by comparison. First, solid electrolytes of Samples 9 to 35 shown in Table 2 were produced by changing the average particle size, compounding ratio, heat treatment conditions, etc. of each raw material in the same manner as in Experimental Example 1. For each sample, the same measurement as in Experimental Example 1 was performed, and the following initial strength was measured. Table 2 shows the results. The initial strength is the strength of the solid electrolyte before the hydrothermal deterioration test.
[0099] Table 2
[0100]
[0101] In Table 2, by comparing the samples 9 to 16 whose abundance ratios of adjacent low-concentration phase particles are close to each other, compared with samples 9 and 16, samples 10 to 15 have higher Increased strength. From this result, it is found that the average particle diameter of the low...
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