Common colorants and printing techniques for the h

2022-10-23
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Common colorants for ceramic decoration and printing skills

I. common colorants for ceramic decoration are mainly inorganic oxides

White - magnesium oxide, magnesium carbonate, aluminum oxide, calcium borate, titanium oxide, zinc oxide, arsenic acid, antimony oxide, cerium compounds and metallic silver, etc

grey - soluble salts of platinum, iridium, rhodium, palladium, ruthenium, osmium, antimony grey, iridium trioxide, etc

ink - mixture of iron oxide, chromium, cobalt, manganese, nickel, pyrolusite, iridium trioxide, etc

yellow - titanium oxide, rutile, barium stannate, chromic acid, lead chromate, cadmium sulfide, gold sulfide, metal gold, etc

orange - rutile, iron titanate, basic lead chromate, chromite, uranium yellow, cadmium sulfide, etc

II. Methods of ceramic decoration

ceramic decoration can adopt several methods, such as Adobe coloring, glaze coloring, underglaze coloring and overglaze coloring. Colorants are divided into: green mud colorants: mix the colorants with bad materials and burn them into shape. Therefore, this kind of colorant is required to have no reaction to the processing of billet making; Glaze colorant: used to decorate dry, plain or fired white porcelain, and then apply raw glaze on it for glaze firing. It is required that under normal firing temperature, it shall not react with glaze, and shall not flow or have fuzzy patterns; Overglaze colorant: it is used for the surface decoration of decorative glaze fired products. It is required that it can be firmly attached to the glaze at a relatively low firing temperature (700~900 ℃), and cannot penetrate into the glaze and flow

III. raw material composition of ceramic glaze

raw materials of ceramic glaze include alkaline, acidic and neutral components. The basic components are fluxes, such as alkali metals, alkaline earth metals, zinc oxide and most colored oxides or chromogenic groups; The neutral component is amphoteric oxide, and the main body is alumina. Sometimes iron oxide and manganese oxide are also included in this component; The representative oxides in the acid composition are silica, phosphoric acid, zirconia, etc.

IV. The purpose of ceramic glazing

1) make the green body impermeable to liquids and gases

2) cover the defects on the surface of the green body and play a covering role; Improve the smoothness of the surface of the products, so as to facilitate various surface finishing, and also improve the strength and aesthetics of the utensils

3) prevent the body from being stained. After glazing, it is easy to wash even if it is stained

4) interact with the body, making the glaze and the body as a whole

v. for example, the indirect ceramic decoration process driven by technology

the indirect or the pendulum shaft is too dirty or rusty. The ceramic decoration process is divided into two processes: Ceramic overglaze decal and ceramic underglaze decal

VI. indirect method (printing method) methods for making ceramic decals

there are three printing methods for making ceramic decals, namely, manually carved copper intaglio ceramic decals, offset large film decals and film decals

VII. Raw material composition of ceramic body

raw materials for ceramic body mainly include feldspar, quartz, kaolin, etc

eight experiments were canceled, and ceramic overglaze decals were divided into two categories according to the decal process

ceramic overglaze decals can be divided into transfer decals and transfer decal film decals according to the different Decal techniques

IX. how to deal with the organic adhesives used in decoration when baking flowers

some organic adhesives need to be used in ceramic decoration by decals, hand colors, printing and other methods. These adhesives should be gradually volatilized or burned at the initial stage of color burning, and must be completely eliminated before the initial melting of the flux

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