| Flake-like gold bronze powder is an important metallic pigment. It has many specialties, such as golden color, angel-depend effect. All these performance make it perfect for decoration and as printing ink. In this paper, our research is focused on analyzing color, improving the luster of gold bronze powders, and its performance in high temperature and resistance to high temperatureWith the cooperation of Hunan Technology Physics Institution, color analyzing instrument has been made, based on the principle of optics. The instrument is effect in telling the color of the powder and is applied to describe the color changes, caused by surface modification.Two methods have been employed to improve the luster of gold bronze powders. The first one is to oxide the powder by H2O2. The data shows that it does work. When H2O2 : powder is 8ml:10g, and the experiment time is 1 hour, the most significant result can be achieved, which the luster increased 25%; The second method is to treat the powder in high temperature. The relationship among treating time, temperature and luster is presented. When the powder is treated for 1 hour at 100, luster increased 9%.To enhance performance of the powder in the present of acid and resistance to high temperature, the powder is coated by SiO2, using Na2SiO3 or (C2H5O)4Si. The effect of coating is estimated by the volume of H2 of the pigment in slight acid solution. When using Na2SiO3 as the raw material, the volume of H2 reduced 6 times, compared to uncoated pigment. When using (C2H5O)4Si as the raw material, the volume of H2 reduced 2 times. The performance of coated powder in high temperature is presented by the color analyzing instrument. The coated powder shows high oxidation resistance. |
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