Agent for imparting fluorescence to ceramic

[0021] Example

[0022] 52.3 g of glycerin (manufactured by Wako Pure Chemical Industries, Ltd.) was added to 40.7 g of water, mixed and stirred for 30 minutes. This aqueous glycerin solution was mixed with 7 g of bismuth nitrate (manufactured by Wako Pure Chemical Industries, Ltd.) and further stirred for 120 minutes to obtain a fluorescence imparting agent for ceramics (Example 1). Based on the compositions in Table 1, the fluorescence imparting agents for ceramics according to the present invention (Examples 2 to 7) and the fluorescence imparting agents for ceramics (Comparative Examples 1 and 2) produced by a conventional production method using an acid solution were prepared according to the same method As a comparative example. In the present example and the comparative example, the fluorescence imparting agent for ceramics was prepared in the g unit of the numerical value in Table 1, however, in the actual production according to the prior art, for example, in order to manufacture 100 kg at a time, at least several tens of liters must be transported Concentrated hydrochloric acid (hydrogen chloride concentration: 37% by weight), and 10 kg of concentrated hydrochloric acid (in the case of the composition of Comparative Example 1) needs to be handled when mixing. Therefore, great danger is caused and efficiency is deteriorated.

[0023]

[0024] Fluorescence evaluation was carried out by measuring sintered materials via a microplate reader (trade name SpectraMax M2, manufactured by Molecular Devices Japan) and comparing the obtained fluorescence intensities (relative fluorescence units) by the following Obtained: A calcined product formed of a zirconium oxide treated under the same conditions in a disc shape having a diameter of 15 mm and a thickness of 0.6 mm and subjected to a calcining treatment in the fluorescence imparting agent for ceramics according to each Example and each Comparative Example immersion in water for two minutes and dried, after which it was subjected to a calcination treatment. The results are shown in Table 1.

[0025] Table 1

[0026]

[0027] As shown in Table 1, in the fluorescence imparting agent for ceramics according to the present invention, the same fluorescence intensity as that of conventional fluorescence imparting agents for ceramics can be obtained without using any acid solution when manufacturing the fluorescence imparting agent for ceramics. Fluorescence imparting agent for ceramics.