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High-temperature-resistant emerald ceramic pigment and preparation method thereof

A technology for ceramic colorant and emerald green, which is applied in the field of high temperature resistant emerald green ceramic colorant and its preparation, can solve the problems of poor brightness, unstable color development, dark green color of ordinary chrome oxide, etc., and achieves bright color and ability to develop color. Strong, high temperature resistant performance

Inactive Publication Date: 2012-11-14
佛山市南海万兴材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Green pigments are widely used in ceramic decoration. However, ordinary chromium oxide green is relatively dark and has poor vividness. Especially in medium and high temperature glazes, the color is unstable and the hue changes to dark gray. Cr 2 o 3 Under high temperature conditions, with CaO, Ba, Na in glaze 2 O, ZnO, etc., such as the formation of Cr-Zn spinel, are easily formed by Cr 3+ to Cr 6+ , resulting in color instability

Method used

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Effect test

preparation example Construction

[0020] The preparation method of the high temperature resistant emerald green ceramic pigment of the present invention includes the following steps:

[0021] 1) Mix chromium oxide green and alumina at a molar ratio of (0.48-0.54): (0.5-0.6);

[0022] 2) Add 3% to 5% of the total weight of the mixture after mixing with alkaline earth metal halide, and mix again;

[0023] 3) The above mixture is calcined in a resistance furnace, and the calcining conditions are: heat preservation at 1250°C-1280°C for 3-4 hours, and natural cooling;

[0024] 4) Grinding, washing, drying and sieving the cooled calcined product.

[0025] The high temperature resistant emerald green ceramic pigment prepared by the preparation method of the present invention has all the following characteristics:

[0026] Appearance: green powder

[0027] Brightness: L: 66.78

[0028] Hue: a: -17.2

[0029] Hue: b: 25.57

[0030] Chemical formula: (CrAl) 2 O 3

Embodiment 1

[0032] 1) Mix chromium oxide green and aluminum oxide (400 mesh) with a molar ratio of 0.48:0.5;

[0033] 2) Add the alkaline earth metal halide which accounts for 3% of the total weight after mixing, and mix well again;

[0034] 3) The above mixture is calcined in a resistance furnace, the calcining conditions are: 1250°C, heat preservation for 4 hours, and natural cooling;

[0035] 4) The naturally cooled calcined semi-finished product is subjected to wet ball milling, the fineness is controlled to D90: 13-15um, and then washed, dried and sieved to obtain the emerald green ceramic pigment.

[0036] Among them, the alkaline earth metal halide can be any suitable substance in the prior art, which will not be repeated here.

[0037] The brightness L: 66.78, a: -17.2, b: 25.57 were compared and tested.

Embodiment 2

[0039] 1) Mix chromium oxide green and aluminum oxide (400 mesh) with a molar ratio of 0.48:0.5;

[0040] 2) Add barium fluoride which accounts for 5% of the total weight after mixing, and mix well again;

[0041] 3) The above mixture is calcined in a resistance furnace, the calcining conditions are: 1250°C, heat preservation for 3.5 hours, and natural cooling;

[0042] 4) The naturally cooled calcined semi-finished product is subjected to wet ball milling, the fineness is controlled to D90: 13-15um, and then washed, dried, and sieved to obtain the emerald green ceramic pigment. The brightness L: 67.12, a: -18.2, b: 25.98.

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Abstract

The invention discloses a high-temperature-resistant emerald ceramic pigment and a preparation method thereof. The high-temperature-resistant emerald ceramic pigment comprises the following steps of: (1) uniformly mixing chromium oxide green with alumina according to a mole ratio of (0.48-0.54):(0.5-0.6); (2) adding alkaline earth metal halide which accounts for 3-5 percent of total weight of the mixed mixture and uniformly mixing again; (3) feeding the mixture in a resistance furnace for calcining under the calcining condition that the heat is preserved for 3-4 hours at the temperature of 1250-1280DEG C and naturally cooling; and (4) grinding, washing, drying and screening the cooled calcined material to obtain the high-temperature-resistant emerald ceramic pigment. According to the high-temperature-resistant emerald ceramic pigment disclosed by the invention, by doping other materials, a high-temperature-resistant solid solution of corundum alumina and chromium oxide green is formed by high-temperature synthesis; and when the high-temperature-resistant emerald ceramic pigment is used at high temperature, chromium ions can be stably maintained to Cr<3+> and the problem that chromium oxide green solution and CaO, Ba, Na2O, ZnO and the like in a glaze react is solved, and thus the effect of stability at high temperature is achieved.

Description

Technical field [0001] The invention relates to the technical field of production of ceramic pigments, in particular to a high temperature resistant emerald green ceramic pigment and a preparation method thereof. Background technique [0002] With the development of social economy, the demand for decoration market is increasing rapidly, and the types are becoming more and more extensive. Ceramic decorative products are deeply loved by people because of their economic, practical, and aesthetic advantages. As the decorative material of ceramic products, ceramic pigments have also developed rapidly because of their great influence on the decorative effect of ceramic products. [0003] Green pigments are widely used in ceramic decoration. However, ordinary chromium oxide green is darker and less vivid, especially in the middle and high temperature glaze. The color is unstable and the hue changes to dark gray. The reason is: Cr 2 O 3 Under high temperature conditions, with CaO, Ba, Na...

Claims

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Application Information

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IPC IPC(8): C04B41/85
Inventor 周占明
Owner 佛山市南海万兴材料科技有限公司
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