A method for preparing phosphor with high thermal stability and a method for producing ceramic tiles

Abstract

The invention discloses a preparation method of a phosphor with a high thermal stability. The preparation method comprises the following steps: (1) adding distilled water to a rare earth metal salt and a magnesium salt to prepare a mixed solution, adding the mixed solution into a microwave and ultrasonic wave synergistic reaction container, starting microwaves and ultrasonic waves, slowly adding apotassium bicarbonate solution into the reaction container, and performing a reaction to obtain a precipitate; (2) drying and crushing the precipitate, adding an elemental aluminum powder and a silicon nitride powder, and performing mixing to reach uniformity in order to obtain a mixed powder; (3) calcining the mixed powder 1400-1500 DEG C in a reducing atmosphere of nitrogen and hydrogen for 2-4h to obtain a sintered product; and (4) crushing the sintered product to obtain the phosphor with the high thermal stability. The invention also discloses a method for producing a ceramic tile from the phosphor obtained by the preparation method. The nitride phosphor has a stable molecular structure and a high thermal stability, and can be applied to the field of ceramics.

Description

technical field [0001] The invention relates to the technical field of fluorescent powder, in particular to a method for preparing fluorescent powder with high thermal stability and a method for producing ceramic tiles. Background technique [0002] Phosphor powder is widely used in low-light lighting and display fields, and is often used in paint coatings, inks, plastics, rubber, glass, LED lights, displays, ceramics, mosaics, etc. At present, the preparation process of phosphor powder is generally divided into two types. One is the low-temperature preparation method: the raw materials are dissolved in the solution, and a precipitate is formed under certain low-temperature reaction conditions. After the precipitate is dried, it becomes a phosphor powder. Patent 201811628639.9; the other is a high-temperature preparation method: react each raw material at a temperature of 600-800°C according to a certain ratio, and the sintered product is crushed to obtain a phosphor, such a...

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Problems solved by technology

[0003] Phosphor powder is usually made of rare earth elements and other auxiliary materials. In addition to rare earth elements, it usually contains Ga, Mg, Zn, F, C and other elements. The production temperature of phosphor powder is low, and the molecular structure is not stable enough, so it is difficult to apply in the field of ceramic tiles

This is because the firing temperature of ceramic tiles is generally around 1200°C. It is inevitable that metal oxide pigments will be added to the glaze or adobe of ceramic tiles. If fluorescent powder is used in ceramic tiles, it will not only be affected by the high temperature of firing, but also It will be affected by the pigment, and the luminous effect of fired tiles is difficult to guarantee

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