JPS6310106B2 - - Google Patents

Description

[Detailed description of the invention]

This invention relates to a semi-matte glaze formulation that aims to effectively utilize coral, which has a low commercial value. The inventor of the present invention has already disclosed in Japanese Patent Publication No. 56-13665 a technique for creating a glaze preparation that effectively utilizes rejected cultured pearls. However, corals used for decoration include red coral, white coral, and white coral, and since ancient times they have been processed into necklaces, arm ornaments, earrings, obi clips, rings, hairpins, etc. Rejected products, workmanship scraps, etc. have been easily disposed of without an effective method of using them being established. This invention was made in view of the current situation, and uses SiO ₂ 55-85% as an oxide,
_{B2O3 0-1} %, _{Al2O3 5-12} %, _{Fe2O3 0-2} %,
CaO3~15%, MgO2~5%, (K, Na)O4~9
% and 8 to 20 parts by weight of coral powder. The details will be described below. What is (K,Na)O in the basic formulation of this invention?
It means either K ₂ O or Na ₂ O, respectively, or both, and all percentages indicate weight percentages, but the reason for limiting the composition of each component as above is as follows:
This is because the expected effects of the present invention could be confirmed based on the results obtained when the basic formulation having the above composition was used and a mixture of this and coral powder was used as a glaze. That is, the base formulation
If less than 8 parts by weight of coral powder is used per 100 parts by weight, the resulting glaze will have a strong luster, while if more than 20 parts by weight is used, the glaze will be completely dull. The result is nothing more than surface pottery, and none of them have the semi-matte elegance that is appropriate for crafts. When using the composition of this invention, take half or the same amount of water in a ball mill, pulverize it until it passes through a 100 to 150 mesh sieve to form a slurry, and apply this to the unglazed surface. It can be subjected to reduction firing at 1250 to 1300°C. Incidentally, such a slurry has a characteristic that it will not run off even if it is applied to the unglazed surface to a thickness of about 1.5 to 2 mm. As described above, according to the present invention, corals, which have little utility value, can be used as an active ingredient in glazes for elegant pottery, so it can be said that the significance of this invention is extremely large. Example The raw materials for glaze were mixed in the weight ratio shown in Table 1, and the
Make basic formulations A and B with the chemical composition shown in the table,

【table】

【table】

【table】

[Table] In addition, coral rejected products (waste mainly composed of red coral) are classified according to the weight ratio shown in Table 3.
The glaze formulations of Sample 1 and Sample 2 were prepared by blending the powders. Here, the soil ash used had the analytical values shown in Table 4. Samples 1 and 2 were placed in a ball mill, respectively.
Half the amount of water was added to this and the slurry was rotated to obtain a slurry that could pass through a 150-mesh sieve. This slurry was applied to each Iga ware tea bowl bisque to a thickness of approximately 1.5 mm, and fired at 1300℃ for 25 hours (10 hours of which were reduction fired).
As a result, in each case, it was possible to obtain a tea bowl with a pale red, elegant, semi-matte surface in which fine air bubbles were distributed.

Claims (1)

[Claims] 1 As oxides, SiO ₂ 55-85%, B ₂ O ₃ 0-1
%, _Al2O3 5-12%, _{Fe2O3 0-2} %, _CaO3-15
%, MgO2 ~ 5%, (K, Na) O4 ~ 9% and 100 parts by weight of a basic formulation and coral (coral)
A semi-matte glaze formulation comprising 8 to 20 parts by weight of powder.